Water gas generation-combustion integrated combustion method and combustion equipment thereof

Abstract

The invention relates to a water gas generation-combustion integrated combustion method and combustion equipment thereof. The combustion equipment is mainly applied to a boiler. The combustion method comprises the following steps: (S1), semi-coke is ignited in a primary combustion zone of a boiler furnace and the temperature of the primary combustion zone is increased to 1100 DEG C or above, wherein the primary combustion zone is covered with a fire grate of a furnace arch; and (S2) sufficient air and saturated steam are injected into the primary combustion zone, so that the semi-coke can react with the injected air and saturated steam in the primary combustion zone, and water gas can be generated from the reaction and combusted; along with the improvement of the semi-coke and water gas combustion speed in the primary combustion zone, the feeding amount of air and saturated steam is gradually increased in the primary combustion zone, so that the water gas generation and combustion speed can be improved, and then the effect that water gas is combusted immediately after being generated can be achieved; and both high-temperature flame generated after the combustion of water gas in the primary combustion zone and unburned high-temperature flame enter the boiler furnace from the arch mouth of the furnace arch, and are further burned out in the boiler furnace under the coordination with secondary air. The combustion method and the combustion equipment provided by the invention are high in heat efficiency, safe, environmentally friendly, and low in operation and maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of boilers, and in particular relates to an integrated combustion method for water gas production and combustion and combustion equipment thereof. Background technique [0002] my country is a country rich in coal and less in oil and gas. Due to the requirements of environmental protection, coal burning has been banned in most parts of the country. Many boiler users across the country are required to change to oil-fired gas-fired boilers. In this way, the production cost of manufacturers is relatively low. Coal-fired boilers have increased by more than 4 times. [0003] In fact, the excessive emission of boiler flue gas is not directly related to fuel (oil, gas, coal), but to combustion equipment and flue gas treatment equipment. For example, black smoke and whether the fuel is burnt are related to the combustion equipment; the sulfur dioxide emission in the flue gas and the sulfur content of the fuel are re...

AI Technical Summary

Problems solved by technology

[0007] 1. Due to the poor seal of the moving grate air chamber, the wind blows in each air chamber, and there is a gap between the two sides of the grate and the side vertical plate, so that the air intake on both sides of the grate is larger than the air intake in the middle of the grate. Uneven distribution of wind leads to uneven combustion, incomplete combustion, high carbon content in ash, low boiler thermal efficiency, black smoke from the chimney, and high operating costs

[0008] 2. The grate maintenance rate is high

[0010] 1. The cost of pulverized coal is high. The pulverized coal is centrally ground and supplied by the pulverizing plant. The price of pulverized coal reaches more than 1,000 yuan per ton, and the cost of fuel is very high.

[0011] 2. High technical requirements for operation, improper operation will cause implosion and explosion in the furnace and reduce the combustion efficiency of pulverized coal, posing safety hazards

[0012] 3. The temperature in the furnace is high and easy to coke, and it is easy to produce nitrogen oxides, so it must be burned at a low temperature, resulting in incomplete combustion

[0013] 4. A large amount of fly ash is produced after combustion, and it is necessary to collect the fly ash with a bag filter with high purchase and maintenance costs, thereby increasing the power of the induced draft fan and increasing the power consumption

[0015] 6. The boiler load adjustment range is low, and the load adjustment is between 70% and 100%.

[0016] 7. The fly ash is serious, the combustion temperature is not well controlled, and it is easy to hang slag on the heating surface tube and corrode the heating surface

[0019] 1. High investment cost for equipment and boiler room

[0020] 2. High maintenance rate of air distribution board

[0021] 3. High maintenance rate of cyclone separation device

[0022] 4. Due to the resistance of the air distribution plate and the resistance of the coal seam, the power of the blower is increased, and the power consumption increases

[0023] 5. It cannot be burned at high temperature. High temperature combustion will burn the air distribution plate and the furnace to hang coke, which will cause the boiler to fail to operate normally.

[0024] 6. A large amount of fly ash is produced after combustion, and it is necessary to use a bag filter with high purchase and maintenance costs to collect the fly ash, thereby increasing the power of the induced draft fan and increasing power consumption

[0025] 7. Can only burn low-quality coal

[0027] 1. High fuel cost

[0028] 2. The emission of nitrogen oxides in the flue gas is high, and it is necessary to use special equipment to remove the nitrogen oxides in the flue gas. The cost of purchasing equipment and using them is very high

[0033] 1. The process is complicated, the risk factor is large, and it is easy to deflagrate

[0034] 2. No energy saving and low thermal efficiency, the reason is that water gas consumes heat energy in the process of gas production and transportation

[0035] 3. The facilities are complicated, the "furnace" and the "pot" are separated, and the area is large

[0036] 4. The gas pipeline is easily blocked by coal tar. The composition of coal tar is relatively complex. The combustion of coal tar produces extremely serious pollutants such as benzopyrene, carbon black, sulfide, and anthracene.

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