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Release date:2018-12-20 The author:www.xapyyj.com Click on:

MCC Energy Conservation and Environmental Protection: Simultaneous Desulfurization and Denitration Technology for Low Temperature Flue Gas Circulating Fluidized Bed

On November 30, at the Green Development Forum of the Iron and Steel Industry in the 40 years of reform and opening up, Li Pengfei, the director of the desulfurization and denitrification technology department and senior engineer of MCC Energy Saving and Environmental Protection Co., Ltd., introduced the company's environmental protection technology: “Applicable to the low temperature of sintering flue gas. The flue gas circulating fluidized bed simultaneous desulfurization and denitration technology has the following characteristics: high removal efficiency, stable and ultra-low emission; by-products can be utilized without secondary pollution; construction and operation costs are low; automation is high, and workers are easy to use. Wait."

First, the technology achieves high-efficiency desulfurization and denitrification of low-temperature flue gas. The technology has a desulfurization efficiency of 99%, a denitration efficiency of 90%, and a dust emission concentration of less than 5 mg/m3.

Second, the technology realizes resource utilization of the removal product. The by-product of the conventional semi-dry desulfurization product component is mainly CaSO3 and is difficult to be utilized. The by-product of this technology is mainly CaSO4 and Ca(NO3)2, and has few CaSO3, and can be quantitatively added to building materials to achieve high value-added utilization.

Third, the technology achieves coordinated control of multiple pollutants. The technology has an absorption rate of more than 90% for SO3, HF and HCl, and has a certain adsorption effect on heavy metals and dioxins, and the chimney has no white smoke.

Fourth, the technology is highly automated.

Fifth, investment and operating costs are low. From the perspective of investment, the integrated low-temperature flue gas circulating fluidized bed removal technology (SCO+CFB) requires only investment of 88 million yuan and annual operating cost of 27.78 million yuan (10.26 yuan / ton of mine). The traditional activated carbon technology requires an investment of about 135 million yuan, and the annual operating cost is 58.87 million yuan (19.62 yuan / ton of mine). "Oxidative denitrification + wet desulfurization (existing equipment) + wet electric dedusting" technology needs to invest 82.7 million yuan (wet desulfurization and old), the annual operating cost is 46.82 million yuan (15.6 yuan / ton of mine). The technology of “rotary spray desulfurization + low temperature SCR denitrification” requires an investment of 115 million yuan and an annual operating cost of 54.75 million yuan (18.5 yuan / ton of mine). Compared with the single desulfurization, the technology only increases the catalyst cost, and the investment increases by less than 30%; the desulfurization and denitration absorbent in operation is calcium hydroxide, and the running cost is low.

From the operational indicators, taking the 265-square-meter sintering machine as an example, using low-temperature flue gas multi-pollutant integrated removal technology (SCO+CFB), desulfurization efficiency ≥98%; denitration efficiency ≥80%; dust ≤5 mg / standard cubic meters; water consumption is about 30 tons / hour; power consumption is 2000 kWh / hour, of which oxygen is 1540 kWh / hour; main absorbent slaked lime consumption is 1.7 tons / hour; no steam consumption; The compressed air consumption is 1500 standard cubic meters per hour. The catalyst is replaced annually after 5 years of use.

Medium crystal environment: dry desulfurization, denitrification and dust removal integrated near zero emission technology

On November 30, at the Green Development Forum of the Steel Industry in the 40 years of reform and opening up, Wang Jian, General Manager of Zhongjing Environmental Technology Co., Ltd. (hereinafter referred to as Zhongjing Environment) Technology Center introduced the company's FOSS-D dry The method of desulfurization, denitration and dust removal is integrated with zero emission technology.

The three core technologies of FOSS-D are ion generator, polymer (BMP) materials and integrated and powerful removal towers. The technology is based on the FOSS ionizer, polymer (BMP) material, and the integrated and powerful removal reaction tower improved by patent technology. The bag-type dust collector can achieve SO2 emission of 0 mg~10 mg/standard cubic meter. NOX emissions 0 mg ~ 20 mg / standard cubic meters, dust emissions 2 mg ~ 5 mg / standard cubic meters.

FOSS-D technology has three major advantages: First, it achieves the ultra-low emission index level. The powerful reaction tower with the patented technology of Zhongjing Environment has greatly improved the removal efficiency and increased the reliability and stability of the overall system. The second is to use non-oxidative absorption reaction, using forced oxidation-selective active reduction technology to completely eliminate secondary pollution caused by NO2 and other NOx. The third is adaptability, can be applied to a large change in various flue gas loads, and the entire removal system has strong compatibility with fluoride and mercury; the application economy is good, the one-time investment is small, and the running cost is low.

At present, the technology has been successfully applied to the Tangshan Delong Iron and Steel Pollutant Integrated Collaborative Treatment Project, the Daye Huaxin and Xingtai Delong Pollutant Integrated Collaborative Treatment Project, and the coordinated management of Tangshan Xinglong and Tangshan Rongcheng Pollutant Integration. project.

MCC Saidi: White Boiler Treatment Technology for Blast Furnace Water

"Blast furnace water slag white feather treatment technology mainly uses 'cooling dehumidification + overheating' to achieve white feather treatment in the production process of steel enterprises." On November 30, in the 40 years of reform and opening up of the steel industry green development forum, MCC Saidi Hou Xiangsong, director of the Public Utilities Department of Engineering Technology Co., Ltd., said that he introduced the company's environmental protection technology.

In this technology, the "whitening" automatic control system can establish the basic database and the basic model, and determine the "whitening" critical area and safety area, that is, according to the measured atmospheric temperature and humidity, combined with the basic database and the critical area simulation model. The critical area of the "whitening" of the flue gas under different atmospheric temperatures and humidity, thus determining the "whitening" safety zone. The “whitening” effect controls the slag wet air after passing through the air-cooling heat exchange and the mixing reheater, and determines whether to enter the “whitening” safety zone according to the state parameter of the smoke exhausting point, and if it has entered the safety zone, the “whitening” is achieved. "If you do not enter the safety zone, increase the number of cooling air fan operating units, increase the operating frequency, enhance the effect of "whitening", and then feedback and compare the discharge point parameters, and cycle until the discharge point parameters enter the safe zone. .

"Blank" energy-saving control. In order to realize the source control of “white feather”, in the process of slag slag slag, the system adjusts the speed of the humid air induced draft fan by condition monitoring under the premise that the slag point does not overflow steam, so as to reduce the source suction operation cost.

"White feather" dehumidification and reheat control. When the ambient temperature changes, the system automatically adjusts the frequency of the cooling air fan, the number of running units, and determines whether the cost is optimal according to the “running cost optimization model”, so that the cycle is optimal until the optimal cost is “whitened out”.

There are three key points in the implementation of this technology:

The first is the heat transfer effect. Adopting air-cooling and water-cooling equipment design and manufacturing technology that has been maturely applied; setting independent flow passages at the outlet of air-cooling section to avoid airflow interference and ensuring air-cooling air volume; defogging device is installed at the outlet of heat exchanger to effectively collect condensed water and avoid secondary evaporation; The hot section is provided with a spoiler facility to promote uniform mixing of the flow field and ensure reheating effect.

The second is slag wool treatment. Set up the online flushing system (high pressure water or compressed air), adopt the modular type to set the switching baffle at the inlet and outlet of each group of heat exchange modules, which is convenient for offline maintenance of individual modules; the heat exchanger inlet and outlet headers are easy to open, which is convenient for offline maintenance; The spacing between the tubes is appropriately increased to facilitate pipe flushing.

The third is the problem of corrosion. The inner wall of the wet air pipe shall be treated with anti-corrosion treatment, and the acid-resistant glass scale shall be coated internally; the main material of the air cooler shall be stainless steel to extend the life of the equipment; the fan blade, the shell, the valve disc and the inner wall shall be treated with anti-corrosion treatment; the condensate drainage system and the flushing system pipeline shall be adopted. Corrosion resistant pipe.

The technology is suitable for the plume treatment of wet desulfurization flue gas, blast furnace water slag, continuous casting secondary cold discharge steaming, steelmaking primary dust removal and flue gas in the steel industry, and has broad application prospects in the market. At present, the six blast furnaces of Tangshan Ganglu Steel mainly adopt the process of “circulating water cooling dehumidification + hot air furnace exhaust gas heating”, which can completely “whiten off” at 5 degrees Celsius.

Hegang Steel Design Institute: Countercurrent Activated Carbon Flue Gas Purification Technology

“The countercurrent activated carbon flue gas purification technology independently researched and developed by Hegang Steel Design Institute is inspired by the European countercurrent process in the context of the increasing environmental pressure of the Beijing-Tianjin-Hebei region and the limitations of traditional processes. Designed by Hegang Steel. A sintering flue gas countercurrent activated carbon process independently researched and developed by the institute has the characteristics of efficient integration of adsorption device, high reliable operation rate and safe and stable system.” On November 30, in the 40-year reform and opening up of the steel industry green development forum, Hegang The chief expert of the Steel Design Institute and the senior engineer of the company introduced the environmental protection technology independently developed by the Hegang Steel Design Institute.

Hegang Steel's countercurrent activated carbon flue gas purification technology has five innovations: First, multi-contaminants synergistically purify the adsorption tower. The second is the superposition technology of the adsorption module. The third is the first development of adsorption module offline technology in China. Off-line technology has the development of large-diameter zero-leakage sealing butterfly valve on the flue, the development of activated carbon sealing valve and the development of spring-supported large-span embedded steel structure (top chain bucket machine) as the support, with on-line maintenance, module hotspot offline Protection, gas volume changes automatically adapt and protect the three major functions. The fourth is the multi-point ammonia and mixing integration technology. The fifth is the static sorting technology of activated carbon.

Desulfurization and denitration push-pull activated carbon discharge device in a countercurrent activated carbon flue gas purification technology of Hegang Steel, a silo detection component protection device, steel frame plant structure, sliding support with tensile action, and a block The seven technical devices such as the three-way feeder for material distribution, the dehumidification device for electrical equipment, and the controller for a two-cylinder push-pull device have obtained national patents.

At present, the countercurrent activated carbon flue gas purification technology has been applied in the domestic 435 square meters sintering machine of Handan Iron and Steel, 360 square meters sintering machine of Handan Iron and Steel, 2 million tons of steel of Shougang Qiangang, and 400 square meters of sintering machine of Shougang Qiangang. on. Monitoring data show that using this technology can achieve SO2 ≤ 10 mg / standard cubic meters, NOx ≤ 50 mg / standard cubic meters, particulate matter ≤ 10 mg / standard cubic meters, two British 0.021 ng / standard cubic meters, fluoride 0.0808 mg / Standard cubic meters, ammonia escape 2.65 mg / standard cubic meters of ultra-low emissions. The operating cost of the countercurrent activated carbon flue gas purification device is 14.3 yuan / ton, which can increase the system operating rate by more than 3%, increase the production efficiency by 3.8 yuan / ton, and reduce the environmental protection tax by 6.8 yuan / ton.

The key technologies of the countercurrent activated carbon flue gas purification device have reached the international leading level, and the economic and environmental benefits are remarkable. The research and application have effectively promoted the development and progress of China's sintering flue gas purification technology, and it has a very high demonstration role and promotion value in the Beijing-Tianjin-Hebei region and even the national atmospheric pollution control project.

Xinlian Environmental Protection: Solid waste disposal process with heavy metals

"The comprehensive utilization of solid waste resources in China has been very severe. In the next 10 years, China's environmental protection situation will be more complicated. The cost of abatement of some traditional pollutants has begun to increase substantially, and the pressure on emission reduction has been increasing. Despite the old environment The problem is expected to be solved gradually, but new environmental problems such as heavy metal pollution, hazardous waste and other toxic and hazardous substances are already in a high-risk situation, and problems such as heavy metal and industrial site pollution will continue to exist for a long period of time."11 On the 30th, Ma Liyang, Chairman of Xinlian Environmental Protection Technology Co., Ltd. said at the Green Development Forum of the Steel Industry for 40 years of reform and opening up.

China's steel, copper, zinc, lead and other smelting scales rank first in the world, producing a large amount of heavy metal containing soot (high furnace gas ash, copper smelting, lead smelting, tin smog, etc.), wet mud (lead zinc wet) The method of smelting and leaching mud, copper and cadmium slag, electroplating sludge, heavy chemical sludge), smelting slag (lead slag, copper slag), tailings slag, etc., totaling more than 50 million tons.

Xinlian Environmental Protection Technology Co., Ltd. (hereinafter referred to as Xinlian Environmental Protection) has pioneered an industrial development path to eliminate heavy metal pollution from the source by means of resource utilization.

The company has three phases for the solid waste disposal process involving heavy metals. The first stage is to collect solid waste and hazardous waste containing heavy metals in steel, non-ferrous metals and chemical enterprises. The second stage is to enrich the non-ferrous metal grade to about 60% by fire enrichment, and make it a raw material for wet separation and extraction. The third stage is de-doping and separation (deheterocyclic section is the most professional and technical barrier of the company). In the stage of enrichment of fire, in addition to the enrichment of non-ferrous metals, some are harmful to the wet extraction of metals. Impurities (such as chlorine, fluorine, etc.) are also enriched in a large amount, so it is necessary to remove impurities; at the same time, the wet separation multi-stage coupling extraction technology is used for fractional leaching, multi-stage purification, electrowinning and displacement, extraction and separation of indium antimony tin, etc., and finally into the wastewater. Resource utilization.

In the solid hazardous waste disposal process with heavy metals, the company uses energy-saving technology (rotary kiln oxyfuel combustion and optimization control technology, kiln fixed-point injection technology, rotary kiln double refractory brick technology, rotary kiln high zinc-containing flue gas waste heat) Power generation technology) and environmental protection technology (rotary kiln flue gas desulfurization technology, wastewater resource utilization technology), and some synergistic technical means (steel soot and non-ferrous smelting waste residue co-processing technology, rotary kiln continuous operation anti-cavity technology, slewing The kiln reducing atmosphere is controlled and the high-purity secondary reduced iron powder technology is prepared).

In the future, the company will promote centralized resources, create a large-scale, specialized, industrialized metallurgical solid waste recycling and resource utilization center, long-term, stable occupation of resources in the region, and concentrate solid waste containing heavy metals. Central disposal.

In addition, Xinlian Environmental Protection Co., Ltd. promotes environmental services for the steel and non-ferrous metals industries, and provides resource-based and harmless treatment solutions for different types of solid hazardous waste characteristics. At the same time, the output of heavy metal-containing hazardous waste resource utilization technology for the “Belt and Road” countries was also launched. Xinlian Environmental has established a fire-fighting factory through joint ventures with waste-producing enterprises such as steel plants to deal with the soot generated by the steel plant, provide technology and be responsible for the long-term operation of the fire-farming plant, and hand over the zinc oxide powder obtained by the fire treatment. Follow the wet treatment of Xinlian Environmental Protection.

Beijing Zhongri United: Active coke dry desulfurization and denitration technology

“In recent years, with the continuous increase of environmental protection efforts in the world, steel companies have gradually paid more attention to the treatment of flue gas. Especially after 2015, the government has continuously adjusted the emission standards of sulfur dioxide, nitrogen dioxide and particulate matter in sintering flue gas. In particular, the ultra-low emission standards to be implemented in 2020 are extremely strict, and it is very rare to look at the world. It can be seen that environmental protection measures have become an urgent issue concerning the survival of enterprises. According to the current evaluation and performance of active coke, Beijing Zhongri The energy-saving dry desulfurization and denitration technology of the joint energy-saving and environmental protection engineering technology Co., Ltd. (hereinafter referred to as Beijing Zhongrilian) and all the dry desulfurization and denitration equipment can meet the environmental protection standards after 2020.” November 30, Beijing Xu Hairu, deputy general manager of the U.S. Union, introduced the company’s advanced technology in environmental protection at the Green Development Forum for the Steel Industry in the 40 years of reform and opening up.

According to reports, the active coke dry desulfurization and denitration technology was jointly developed by Nippon Steel & Sumitomo Engineering Co., Ltd. and Beijing Zhongrilian. Its working principle is to use dry coke desulfurization and denitration equipment, using activated coke to remove sintering machine and power generation boiler. Environmentally harmful substances in flue gas such as waste incinerators and cement kilns.

The dry desulfurization and denitration equipment is composed of an adsorption tower, an analytical tower and a chain bucket machine for circulating and transporting active coke, and utilizes the adsorption performance and catalytic action of the activated coke to desulfurize and denitrify. In the adsorption tower, the active coke falls slowly from above, and adsorbs sulfur dioxide, dust, and harmful substances of dioxins and heavy metals while being in contact with the flue gas flowing horizontally.

In addition, by spraying ammonia into the flue gas, catalytic action of the active coke can be exerted to decompose the nitrogen dioxide into water and nitrogen. The activated coke adsorbing harmful substances is discharged from the lower part of the adsorption tower, sent to the analytical tower through a chain bucket machine, and is heated to 430 degrees Celsius in an inactive environment of the analytical tower to analyze sulfur dioxide and decompose dioxins. Sulfur dioxide can be used in subsequent processes to make concentrated sulfuric acid or gypsum and is recycled as a useful by-product. The activated coke which decomposes the harmful substances in the analytical tower is sieved, and after pulverizing the activated coke and dust, it is discharged to a chain bucket machine and circulated to the adsorption tower to continue to be used as an adsorbent.

The active coke dry desulfurization and denitration technology has the following characteristics: First, the active coke has both the adsorbent and the catalyst. The active coke can remove dust, dioxins, heavy metals and other environmentally harmful substances while desulfurizing and denitrifying. The emission concentration is controlled to a very low level; the second is to recover the high-purity concentrated sulfuric acid (or gypsum) with higher added value as the raw material; the third is that the flue gas treatment process does not use water, which is suitable for water-deficient areas.

It is worth mentioning that the desulfurization and denitrification performance of activated coke is greatly affected by the type, ratio and manufacturing method of raw coal. Beijing Zhongrilian has its own active coke evaluation experimental device, which can evaluate the active coke performance applicable to real machines in advance. . The experimental device can perform basic physical property measurement of active coke specific surface area, ignition point, strength, etc., and can perform actual gas experiments under simulated gas conditions and operating conditions to evaluate desulfurization and denitration performance. At the same time, in order to prevent problems such as uneven growth of active coke in the adsorption tower, active coke retention, desulfurization and denitrification performance, etc., Beijing Zhongrilian eliminates the shrinkage and misalignment inside the adsorption tower, and adjusts the speed of the active coke to suit The best speed to work in each room.

In general, the active coke dry desulfurization and denitration technology can achieve desulfurization and denitrification, relying on the desulfurization and denitration performance of the activated coke itself, and the equipment structure that makes it perform. Beijing Zhongrilian has provided an optimal and stable equipment design solution through active coke evaluation technology, active coke moving layer technology and stable operation based on years of production experience.

                                                                                                                                                                                                          Excerpt from: China Metallurgical News

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