2 gas power generation principle and application 2.1 Gas power generation principle The coke oven and blast furnace mixed gas satisfying the gas fuel "fuel specification" enters the three-stage centrifugal gas compressor and is pressed to 2.25 MPa. Then, the gas turbine enters the gas turbine and the treated air is mixed and combusted in the combustion chamber. The high temperature gas is in The expansion work of the gas turbine, the rated power of the gas turbine generator set: 50 000 kW. The temperature of the flue gas discharged from the gas turbine still reaches 510 °C, and enters the double-pressure residual heat furnace to generate two parameters of evaporation: medium-temperature medium-pressure evaporation enters the evaporating wheel generator set for power generation, its rated power is: 18 000 kW; low-pressure saturation Evaporation is used to remove oxygen from the furnace feed water. The flue gas was reduced to 140 ° C in the waste heat furnace and discharged to the atmosphere. The main auxiliary system: industrial water system, power supply and distribution system, automatic control system, fire protection system, etc. 2.2 Application The project is based on the coke oven gas and blast furnace gas of Jigang, and the high-efficiency combined cycle generator set is used to realize the comprehensive utilization of power plant construction projects. The project attaches great importance to environmental protection. The gas is cleaned before combustion, and there is no solid emissions in the exhaust gas. It is a clean fuel for power generation. At the same time, the reuse rate of production wastewater reaches 100%. For the noise of power plant operation, measures such as vibration reduction, installation of silencer and sound insulation are adopted to mitigate the impact on the surrounding environment. The key equipment adopts GE technology of the United States and incorporates several innovative technologies with independent intellectual property rights of Jinan Iron and Steel. Its equipment level, technical content and comprehensive efficiency have reached domestic leading and international advanced level in the power generation industry. The project is two sets of gas D-evaporation combined cycle generator sets. Each set consists of a gas turbine, a gas compressor, a gas turbine generator, a waste heat furnace, an evaporation turbine and an evaporation wheel. The machine is composed of two relatively independent power generation units. The main production equipments of the project are: 165,000 m 3 dry cabinets; 2 plate electrostatic precipitators; 2 DMCL706+2MCL707 gas compressors; 2 PG6561B-L gas turbines; 70 t/h waste heat furnace 2 Taiwan; 2 sets of L18-3.43-4 condensing steam evaporator; 2 sets of 18 MW evaporative wheel generators; 2 sets of 50 MW gas turbine generators; 2 sets of 80 MVA step-up transformers; 1 set of oxygen rapid analyzer (0% 5%), 1 set of calorimeter, 1 set of ultrasonic counter. The gas turbine control adopts the MARK-V system. The important signals are hardwired and connected to the whole plant DCS (distributed control system), and the Ethernet interface for communication with DCS is left. The waste heat furnace, condensing evaporator wheel generator, gas mixing Stations, gas compression systems, electrical systems, light oil systems, cooling water systems, etc. are controlled by DCS. 3 features and effects 3.1 Gas-evaporation combined cycle power generation features high electrical efficiency: the electrical efficiency of Jinan Steel's gas power generation equipment is above 40%, close to the electrical efficiency of a 300,000 kW thermal power plant. The construction period is short: the construction of the whole project is small and the process is simple. The construction period is only 17 months, which is shortened by 3 months. In addition, it has the characteristics of high degree of automation, flexible operating conditions, quick and convenient start-stop, simple operation and maintenance, low cost, less one-time investment, water saving, and low calorific value gas. 3.2 Gas-evaporation combined cycle power generation effect 3.2.1 Economic Benefits After the project is put into operation, the net output power of the gas evaporative power generation unit is 87 000 kW, 7 500 h for the whole year, and the electricity price is calculated at 0.5 yuan/kWh. 87 000×7 500×0.50×10 -4=32 625 (ten thousand yuan) 3.2.2 The financial impact of reducing the cost of electricity consumption, driving the cost of the head office to decline, and because the payment method of Jigang’s electricity bill is paid monthly, Actually, the payment of working capital, the current gas-evaporation combined cycle power generation, has a good impact on the operation of the head office liquidity. 3.2.3 Promote the recovery of converter gas In the old user system, the coke oven gas is replaced by converter gas, which not only ensures the gas consumption for power generation, but also promotes the increase of converter gas recovery. The successful commissioning of Jinan Steel's gas-Dvaporation combined cycle power generation project is a typical demonstration and driving role for steel enterprises to maximize the comprehensive utilization of resources, improve the comprehensive utilization of resources, reduce production costs, and achieve the balance of power and energy. Welding accessories and consumables Argon And Co2 Regulator,Welding Cable Connector,Welding Earth Clamp Prosper Industry And Trade Co., Ltd. , http://www.pxweldingmachine.com
1 The amount of venting increased correspondingly, resulting in a large amount of waste of gas resources, and the urgent need to develop new gas users; and the production scale of the company was continuously expanding.