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Utilization system and utilization method for replacing combustion air of coal-fired boiler with combustible waste gas

A coal-fired boiler and air-combustion technology, which is applied in combustion equipment, lighting and heating equipment, etc., can solve the problems of small processing capacity, poor adaptability of exhaust gas concentration, and poor gas, so as to reduce pollutant emissions, reduce boiler pollutants, Recycling reduces the effect

Pending Publication Date: 2019-12-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a system and method for utilizing combustible waste gas instead of combustion air in a coal-fired boiler. Existing problems such as poor adaptability to waste gas concentration, poor gas, unstable gas discharge, small processing capacity and complex system reduce the utilization cost of combustible waste gas

Method used

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  • Utilization system and utilization method for replacing combustion air of coal-fired boiler with combustible waste gas

Examples

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Effect test

Embodiment 1

[0031] During work, the volume fraction of the ventilation gas is controlled at 0.1% to 1%, which can be directly sent into the boiler 16. According to the type of the air preheater 11, when the air preheater 11 is a rotary air preheater, it can be Realize the separate delivery of the primary air and secondary air of the boiler 16. At this time, the ventilation gas source is connected to the third blower 10 through the connecting pipe, directly replacing the secondary air of the boiler 16 and sent to the furnace for combustion, and the primary air passes through the fourth blower 9 is connected with the air preheater 11 and the pulverizing system 15 to carry pulverized coal into the furnace as the primary air. When the air preheater 11 is a partitioned air preheater, the secondary air and secondary air cannot be realized. At this time, the ventilation gas source is connected with the third blower 10 and the fourth blower 9, and the ventilation gas enters the air preheater 11 to...

Embodiment 2

[0033] For other combustible waste gases, pass other combustible waste gases into the gas storage tank 1 for collection, the gas output from the gas storage tank 1 is dedusted by the dust removal equipment 4, and the gas purification equipment 5 removes the harmful gas (H 2 S, Cl 2 ), then enter the dehumidification equipment 6 for dehumidification, the gas output by the dehumidification equipment 6 is diluted with air, so that the volume fraction of combustible waste gas is controlled at 0.1% to 1%, and the diluted gas passes through the first blower 7 and the second blower 8 into the furnace of the boiler 16, wherein, when the air preheater 11 is a rotary air preheater, the primary air and secondary air of the boiler can be delivered separately, and the combustible waste gas output by the second blower 8 directly replaces the boiler The secondary air of 16 is sent into the furnace for combustion, and the primary air passes through the first blower 7, the air preheater 11 and...

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Abstract

The invention discloses a utilization system and a utilization method for replacing combustion air of a coal-fired boiler with combustible waste gas. The method comprises the following steps: combustible waste gas in the gas storage tank is divided into two paths, wherein one path enters an air preheater through a first air feeder to be preheated and then enters a pulverizing system, a gas-powdermixture output by the pulverizing system serves as primary air to be fed into a boiler, and the other path enters the air preheater through a second air feeder to be preheated and then serves as secondary air to be fed into the boiler. By means of the system and method, the combustible waste gas heat can be recycled, so that the problems that an existing device is poor in waste gas concentration adaptability, poor in gas, unstable in gas emission, small in treatment amount and complex in system are solved, and the utilization cost of combustible waste gas is reduced.

Description

technical field [0001] The invention belongs to the field of ventilation gas control and energy saving and emission reduction, and relates to a utilization system and method for replacing combustion air of a coal-fired boiler with combustible waste gas. Background technique [0002] In the process of industrial production, a large amount of combustible waste gas is directly discharged or incinerated every year. The main sources are (1) coke oven gas and blast furnace gas in the smelting industry; (2) hydrocarbon gases discharged from petrochemical industry; (3) Associated gas in the initial stage of oil and gas field development; (4) Coalbed methane from coal mining; (5) Combustible waste gas from landfills and food industries. The direct discharge of these gases not only causes a huge waste of energy, but also causes serious environmental pollution. Its main components are hydrocarbon gases such as methane, most of which are poisonous and can cause cancer if directly inhal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C9/06
CPCF23C9/06
Inventor 邓磊马诗豪白冰张妍朱正荣龙纪淼车得福
Owner XI AN JIAOTONG UNIV