1. Gas Power Generation Technology of Internal Combustion Engine
Internal combustion gas generating units can burn not only high concentration gas, but also low concentration gas. Through the closed-loop control system of the unit gas, the gas and oxygen in the air are automatically mixed. According to the volume and compression ratio of the combustion chamber, the air-fuel ratio is accurately controlled to ensure indifferent combustion and efficient power generation. Automatic detection of gas intake temperature, gas intake pressure, gas valve after certain pressure, temperature, power, speed, mean temperature and other parameters, automatic adjustment of the unit operating conditions, habitual site gas concentration and pressure shaking, ensure the smooth operation of the unit, with a wide concentration habit, strong anti-shaking ability, high degree of automation. Pre-combustion technology and digital combustion technology are adopted in internal combustion gas generating units. Through these two technologies, combustion energy can be increased effectively, exhaust temperature can be lowered, and unit power can be increased.
2 High-concentration Gas Transportation Technology
High-concentration gas is extracted from the drainage station and sent to the generating unit after being treated by water-sealed flame arrester, gas-water separator and dry flame arrester. When the gas is excessive or the unit is defective, the gas is exhausted after the torch burning.
1.1 Container Gas Pretreatment Technology
The gas pretreatment process is automatically controlled. It will dehydrate, dedust, cool and pressurize the gas, and monitor the gas flow rate, concentration, pressure, temperature, humidity and other parameters. It will automatically drain and alarm according to the condensate water level.
In high-concentration gas power generation projects with gas concentration above 30%, when the gas generating unit can not consume all the gas, or the shortcomings of the generating unit, during the normal maintenance period, when the high-concentration gas needs to be emptied, it automatically ignites the torch and then discharges the atmosphere. When the gas concentration shakes and changes below 30%, the torch stops working and the gas is directly exhausted. The mode of flare is ground-closed flare, and the scale of flow dispatch is determined by the total gas flow and the equipment of the unit. The processing gas of the torch matches the gas consumption of the gas generator set dynamically.
1.3 Low Concentration Gas Transportation Technology
Low concentration gas is extracted from the drainage station by using water level automatic water seal fire and explosion relief equipment, screen filter, special flame arrester for gas pipeline, overflow water seal fire and explosion relief equipment, low temperature wet release valve and low concentration gas and water mist mixed safe transportation technology to complete the safe transportation of gas and ensure the normal power generation of the unit.
The safe transportation system of low concentration gas and water mist mainly consists of water mist attack system, dehydration system and control system. The system is mainly composed of wet flame retardant and explosion relief equipment, fire retarder, water mist attack device, dehydrator, circulating water pump, pool and pipeline valve.
1.4 Waste Heat Utilization Technology
The flue gas emission temperature of gas generator set after combustion is about 500 - 600 C. In order to save energy, a steam waste heat boiler is equipped on the exhaust pipe of each unit. Softening water is pumped through the feed water to the waste heat boiler to recover the exhaust heat of the unit, so that the exhaust gas temperature is reduced to about 150 C. The generated steam is gathered and sent to the heat user, and the condensate water is recycled to the softening water tank for recycling.
Softening water system is composed of filters, automatic softening water equipment, pipeline pumps, softening water tanks, etc. Softening water is used as supplementary water for steam waste heat boiler and circulating cooling water system of generator set, as well as supplementary water for atomizing water pool.