Coal-fired boiler combustion system with participant mixture of drainage gas and ventilation gas

Abstract

The invention provides a coal-fired boiler combustion system with participant mixture of drainage gas and ventilation gas. Ventilation flow generated in a mine reflow shaft is pumped by a ventilator to enter a draught fan near a coal-fired power plant along a ventilation passage; the ventilation flow is guided by the draught fan to enter a boiler inflow passage; a drainage gas passage leads to a ventilation flow passage; the start end of the drainage gas passage is provided with a drainage gas pump; the drainage gas pump pumps the drainage gas into the drainage gas passage; the drainage gas flows into the ventilation flow passage along the drainage gas passage, mixes with the ventilation flow in the ventilation flow passage and flows to the draught fan. The system has the advantages that the drainage gas is mixed into the ventilation gas or diluted to safety concentration before participating in combustion, the defect that the concentration of the ventilation gas is deficient generally is overcome, surplus gases, such as low-concentration drainage gas and gas unit gas difficult to utilize, are utilized to the maximum extent, combustion conditions of the boiler in the power plant are improved, and economic and social benefits are significantly improved.

Description

technical field [0001] The invention relates to a coal-fired boiler combustion system in which the extraction gas is mixed with exhaust gas. Background technique [0002] During the coal mining process, a large amount of gas stored in the coal seam often flows into the mining space. In order to ensure mining safety and control gas, it is necessary to use mine ventilation to remove mine gas. In this way, a large amount of gas will be discharged into the atmosphere along with the ventilation of the mine, which will cause serious air pollution while wasting precious gas energy. [0003] In particular, my country's coal resources are relatively rich, but most of the coal fields are high-gas coal fields, and the gas permeability of coal seams is poor. According to the current technology, the utilization rate of mine gas drainage is low. Therefore, most of the gas is discharged into the atmosphere through mine ventilation. However, the gas content in the exhaust air flow of a ...

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Problems solved by technology

[0009] 2. Part of the extracted gas cannot be used by gas-fired units due to its low concentration. As a result, most or all of the extracted gas cannot be used and can only be directly emptied

[0010] 3. Quite a lot of coal mine pithead power plants are gangue power plants. Due to poor coal quality, it is difficult to operate coal-fired units in power plants. The proportion of clean coal mixed is quite large, and the existing schemes have not maximized the improvement of boiler combustion conditions.

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