Research and Application of Direct Combustion Coke Oven Gas Power Generation Technology
Research and application of Shandong metallurgical direct combustion coke oven gas power generation technology Chen Keqiang (Qingdao Iron and Steel Group Zhangzhou Coking Plant, Shandong Jining 272017) source, protect the environment, and created good economic and social benefits: direct combustion coke oven gas power generation Coking; gas; power generation is a precious resource for human survival. According to UNESCO reports, several conventional energy sources (such as coal, oil, natural gas, etc.) used by humans have their proven reserves on the earth. The mining and use speed can only last for 70 years. Therefore, human beings now face two major tasks in energy: first, to develop new energy as soon as possible; second, to actively save energy and protect energy. In addition, environmental protection is also urgent in the world today. Issues, pollution of water resources, pollution of the atmosphere, and destruction of the ozone layer have already aggravated the greenhouse effect on the planet. Drought, locust, sandstorms and other ravages pose a huge threat to human survival. However, in China, water, coal, natural gas and other energy sources are mostly distributed in the west. In the use of energy, the government has already made efforts, such as the use of water resources: Gezhouba, the Three Gorges, the Yellow River Xiaolangdi and other large waters and party secretary, senior economist. The oil is greatly reduced, and the oil removal rate is over 80%. (2) The application of the centrifugal air flotation deoiling technology solves the problem of ammonia degreasing, which causes a qualitative change in the ammonia water treatment process: after the residual ammonia water is degreased, the solvent is removed. Phenol, then involved in ammonia washing; after de-oiling of ammonia-rich water, it solved the problem of clogging of ammonia plant, and reduced the construction of steam-ammonia wastewater power station; the gas-to-east gas transmission plan of natural gas brought vitality to major cities but another In view of the unreasonable distribution and utilization of energy in various places, the human survival is lurking with a huge crisis. 1 According to the Qingdao Iron and Steel Group Zhangzhou Coking Plant (referred to as the Zhangzhou Coking Plant), due to the special geographical environment, the gas is currently seriously over-supplied. In May 1994, the N32-88 type tamping machine coke oven, which was completed and put into operation in Zhangzhou Coking Plant, is a relatively advanced furnace type in China. The production scale is 120,000 tons of high-quality metallurgical coke per year, and 142,000 tons of Nissan gas. M3, can supply 70,000 m3/d (it is estimated that the annual coke production capacity after expansion at the end of 2001 is 200,000 tons, and the gas supply capacity can reach 120,000 m3/d). However, the current residential gas consumption in Zhangzhou City is 12,000. Around m3/d, a large amount of valuable resources are wasted, and the limited resources are rapidly reduced. On the other hand, a large amount of gas is released and seriously pollutes the environment. At the same time, the Cangzhou Coking Plant only releases one gas, and contains ammonia every day. Only using wastewater to wash ammonia can meet the process requirements, saving a lot of soft water, environmental protection, water quality has undergone tremendous changes, from the treatment of residual ammonia, ammoniated wastewater, part of ammonia-rich water and sporadic wastewater to now only treat steamed ammonia wastewater and sporadic wastewater, saving Diluted water, reduced external drainage, annual environmental protection benefits of more than 3 million yuan lost more than 30,000 yuan (according to the current production capacity), the cost of tons of coke increased by 30 to 60 yuan, making the production of enterprises into an extremely unfavorable passive situation. In order to make full use of the precious gas as a valuable resource, after repeated investigation and demonstration, the Cangzhou Coking Plant has successfully developed the self-discharged gas into the direct-fired generator set to generate electricity, which not only overcomes the high investment, long cycle and low return rate of steam power generation. The shortcomings, but also can create good economic and social benefits. 2 Technical solutions analysis demonstrates the use of gas combustion to release energy for work. The traditional method is to use steam turbines or gas turbines to generate electricity. The initial investment of these two schemes is relatively high (generally 6800~7000 yuan/kW). At the same time, the thermal efficiency of steam turbines is low (generally 20%), while the thermal efficiency of gas turbines is relatively high (about 40%), but its operation and maintenance The cost is very high. It uses the direct-fired gas generator set to generate electricity. The power generation efficiency can reach 40% (that is, 0l6m3 coking gas can generate 1kW.h), and the initial investment of equipment is also low, which is 250å±®3000 yuan/kW. The use of 12V190-500 diesel engine for retrofitting, due to the use of jet intake and in-cylinder aeration process, effectively solve the problem of high gas hydrogen content (50~60%) combustion "shooting". The application of coking gas is still the first in China (the gas turbines of other manufacturers are all externally mixed gas). The self-supplied power station system of the Cangzhou Coking Plant is the main engine. After the unit is put into operation, the cost per ton of coke is greatly reduced. To find a good way out for the use of surplus gas from coking gas supply manufacturers, there will be extremely broad development prospects in energy conservation and environmental protection. 3 Direct combustion coke oven gas power generation technology is in the research and trial stage. In China, there are only a few cases where coke oven gas does not undergo intermediate conversion and direct combustion to drive the generator, and gas turbines are used to generate electricity. However, gas turbine power generation equipment investment and operation management costs are high, and the unit capacity is not suitable for medium and small. Coking enterprises have low methane content in coke oven gas and high hydrogen content. Therefore, the unit used for external gas mixing on natural gas cannot run on coke oven gas. The "direct-fired coke oven gas power generation technology" is not only applicable to coke oven gas, but also widely used in gas fields such as natural gas, mine gas, biogas, straw gas, blast furnace gas, etc. This technology adopts the US imported ignition system, using jet air intake. The new process of mixing air in the cylinder and reasonable gas pressure and voltage regulation, setting up a simple and efficient desulfurization oil-water separation, cooling cycle and other devices, realizing the automatic parallel and substation between the generator sets and the commercial power. In addition to the power distribution and a variety of protection functions, the system is also equipped with a self-designed muffler outside, greatly improving the surrounding environment. 4 Operation effect and benefit analysis According to the needs of production scale and the characteristics of power generation and self-use, the generator set operated by the above principle is installed in the self-supplied power station of Cangzhou Coking Plant. The system hydraulic pressure, oil pressure, water temperature overspeed, overcurrent overload Power and other protections are complete, long-term operation maximum output power 400kW voltage 400/230V frequency 50Hz fluctuation less than 0.5Hz, instantaneous voltage regulation rate is less than 2 5%, gas consumption is less than 12600kAW.h, exhaust gas temperature (turbine end) rated power Because the technology is to send the released gas into the unit, the harmful substances in the gas are involved in the combustion in the machine, so the pollution-free emission is basically achieved, and the environmental protection benefits are very significant. The first unit of the project was put into operation in 1998 in Zhangzhou Coking Plant, and the second unit was put into operation in 1999, including the test time. By the end of October 1999, the two units had accumulated nearly 13,000 hours of operation, with a total power generation of 7.2 million kW. h, create a benefit of 3.6 million yuan, so that the cost per ton of coke has dropped by 30 yuan, 500 units, 3 units (2 with 1 unit) for power generation, total equipment investment of 4 million yuan, considering gas quality and power factor and long-term (continuous) operation of the engine, output The power needs to be reduced by 10% and the demand for load. The actual power of each unit is 400kW.h, and the annual power generation of 3 units (2 for 1 and 1 unit) is 7 million kW.h, according to the current average of the region. The electricity price will be removed from the operation and maintenance costs, and the annual profit will be 3.6 million yuan. The investment can be recovered in 1 year and 2 months. According to the Shanxi province's coke production, only the remaining gas in one province is used to generate electricity. kW.h, more than 1 billion kW.h more than steam power generation, and the unit can also be widely used in blast furnace gas, mine gas, straw gas, natural gas and other gases. In addition to abundant natural gas resources, China has recently discovered a large coalbed methane (more than 90% methane in gas) with a reserve of 40 billion m3. If all rice is used to generate electricity by this direct combustion method, it can generate 200 billion kW.h. It generates more than 100 billion kW.h of power generation than steam turbines, so its application and application range is extremely broad.
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