阅读说明：本技术 一种利用干熄焦一次除尘灰制备可燃性气体的方法 (Method for preparing combustible gas by using dry quenching primary dedusting ash ) 是由 赵华 马银华 夏伟 刘福军 王超 代成 武吉 高利刚 于 2021-06-29 设计创作，主要内容包括：本发明涉及一种利用干熄焦一次除尘灰制备可燃性气体的方法,将焦炉部分焦炉烟气抽出送至干熄炉一次除尘系统,利用焦炉烟气中所含的二氧化碳和氧气,与干熄焦一次除尘后的高温焦粉进行反应,生成一氧化碳含量为50％以上、温度为300～700℃的高温贫煤气,再将高温贫煤气通入焦炉加热煤气管道中,作为焦炉补充加热用煤气,提高焦炉加热煤气的温度。本发明通过将干熄焦一次除尘高温焦粉与焦炉烟道废气中的二氧化碳及氧气发生反应,得到含较高浓度一氧化碳的高温贫煤气,用作焦炉补充加热用煤气,同时有助于提高焦炉加热煤气的温度,降低焦炉炼焦时的耗热量。(The invention relates to a method for preparing combustible gas by using coke dry quenching primary dedusting ash, which comprises the steps of pumping out coke oven smoke from a coke oven to a coke dry quenching primary dedusting system, reacting carbon dioxide and oxygen contained in the coke oven smoke with high-temperature coke powder subjected to coke dry quenching primary dedusting to generate high-temperature lean gas with carbon monoxide content of more than 50% and temperature of 300-700 ℃, introducing the high-temperature lean gas into a coke oven heating gas pipeline to serve as coke oven supplementary heating gas, and increasing the temperature of the coke oven heating gas. The invention obtains high-temperature lean gas containing carbon monoxide with higher concentration by reacting high-temperature coke powder subjected to primary dust removal by dry quenching with carbon dioxide and oxygen in flue gas of the coke oven, and the high-temperature lean gas is used as gas for supplementing and heating the coke oven, is beneficial to improving the temperature of the coke oven heating gas and reducing the heat consumption of the coke oven during coking.)

1. A method for preparing combustible gas by using coke oven primary dust is characterized in that part of coke oven smoke is pumped out and sent to a primary dust removal system of a coke oven, carbon dioxide and oxygen contained in the coke oven smoke react with high-temperature coke powder subjected to primary dust removal of the coke oven to generate high-temperature lean gas with carbon monoxide content of more than 50% and temperature of 300-700 ℃, and the high-temperature lean gas is introduced into a coke oven heating gas pipeline to be used as coke oven supplementary heating gas to improve the temperature of the coke oven heating gas.

2. The method for preparing combustible gas by using dry quenching primary dedusting ash according to claim 1, is characterized by comprising the following steps:

1) connecting the coke oven with a primary dust removal system of the dry quenching furnace; a reactor is arranged below an ash bucket in a primary dust remover of the dry quenching furnace, the top of the reactor is communicated with an ash outlet of the ash bucket, a flue gas inlet and a lean gas outlet are respectively arranged at two sides of the reactor, and a supplementary heating device is arranged at the bottom of the reactor; a flue gas outlet is arranged on a flue of the coke oven and is connected with a flue gas inlet of the reactor through a flue gas pipeline, an exhaust fan is arranged on the flue gas pipeline, and a valve is arranged on the flue gas pipeline close to the flue gas outlet; a lean gas inlet is arranged on a coke oven heating flue gas pipeline and is connected with a lean gas outlet on the reactor through a lean gas pipeline; a check valve is arranged on the lean gas pipeline;

2) in the operation process of the coke oven and the dry quenching furnace, high-temperature coke powder intercepted by the gravity settling action in the dry quenching primary dust remover falls into the reactor; opening a valve, starting an exhaust fan, pumping out coke oven flue gas in a coke oven flue and then sending the coke oven flue gas into a reactor; carbon dioxide with the volume content of 20-23 percent and oxygen with the volume content of 3-5 percent in the coke oven smoke react with high-temperature coke powder in a reactor to obtain high-temperature lean gas with the carbon monoxide volume content of more than 50 percent and the temperature of 300-700 ℃; supplying heat to the reactor through a supplementary heating device to keep the temperature in the reactor above 950 ℃;

3) high-temperature lean gas is introduced into a coke oven heating gas pipeline through a lean gas pipeline to be used as gas for supplementing heating of the coke oven, and a check valve is used for preventing the coke oven heating gas from reversely flowing into a reactor.

3. The method for preparing combustible gas by using dry quenching primary dedusting ash as claimed in claim 2, wherein the ash hopper is provided with 3 level meters along the height direction, namely a high level meter, a middle level meter and a low level meter; the amount of the coke oven flue gas pumped into the reactor is controlled by adjusting the opening of the valve, so that the material level of the high-temperature coke powder is controlled between a high material level and a medium material level.

4. The method for preparing combustible gas by using dry quenching primary dedusting ash as claimed in claim 2, wherein pressure gauges are respectively arranged on the blast furnace heating gas pipeline and the lean gas pipeline near the joint of the blast furnace heating gas pipeline and the lean gas pipeline.

5. The method for preparing combustible gas by using dry quenching primary precipitator dust as claimed in claim 2, wherein the valve is an electric valve, and the exhaust fan, the valve, the charge level indicator and the supplementary heating device are respectively connected with a control system.

Technical Field

The invention relates to the technical field of coking, in particular to a method for preparing combustible gas by using dry quenching primary fly ash.

Background

The coking industry is a large energy-consuming household, at present, the energy consumption of the coking production process reaches 180-200 kg standard coal/t, wherein the energy consumption of the coking process accounts for 70-80% of the energy consumption of the whole process; the coking heat consumption is an important evaluation index of the thermal efficiency of the coke oven, and the production cost of the coke is high due to overhigh coking heat consumption.

In the dry quenching system, a primary dust removal device is usually arranged between the dry quenching furnace and the dry quenching boiler, and the large particle dust carried in the circulating gas of the dry quenching furnace is removed in a gravity settling mode, so that the method plays a vital role in protecting the furnace tube of the dry quenching boiler. In the operation process of the dry quenching furnace, high-temperature coke powder with the settlement of about 2-3 t/h and the temperature of about 900 ℃ is settled in a primary dust removal device, and the high-temperature coke powder is cooled by a water-cooling sleeve pipe generally, so that the problems of air leakage, high equipment failure rate, non-utilization of a large amount of red coke heat and the like exist, energy waste is caused, and hidden dangers are brought to the safety production of the dry quenching furnace and the dry quenching boiler.

Disclosure of Invention

The invention provides a method for preparing combustible gas by using dry quenching primary dedusting ash, which is characterized in that high-temperature coke powder with high concentration of carbon monoxide is obtained by reacting the dry quenching primary dedusting high-temperature coke powder with carbon dioxide and oxygen in flue gas of a coke oven, and the high-temperature lean gas is used as coal gas for supplementing and heating the coke oven, is beneficial to improving the temperature of the coke oven for heating the coal gas and reducing the heat consumption of the coke oven during coking.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for preparing combustible gas by using dry quenching primary dedusting ash comprises the steps of pumping out part of coke oven smoke from a coke oven to a dry quenching primary dedusting system, reacting carbon dioxide and oxygen contained in the coke oven smoke with high-temperature coke powder subjected to dry quenching primary dedusting to generate high-temperature lean gas with carbon monoxide content of more than 50% and temperature of 300-700 ℃, introducing the high-temperature lean gas into a coke oven heating gas pipeline to serve as coke oven supplementary heating gas, and increasing the temperature of the coke oven heating gas.

A method for preparing combustible gas by using dry quenching primary dedusting ash specifically comprises the following steps:

1) connecting the coke oven with a primary dust removal system of the dry quenching furnace; a reactor is arranged below an ash bucket in a primary dust remover of the dry quenching furnace, the top of the reactor is communicated with an ash outlet of the ash bucket, a flue gas inlet and a lean gas outlet are respectively arranged at two sides of the reactor, and a supplementary heating device is arranged at the bottom of the reactor; a flue gas outlet is arranged on a flue of the coke oven and is connected with a flue gas inlet of the reactor through a flue gas pipeline, an exhaust fan is arranged on the flue gas pipeline, and a valve is arranged on the flue gas pipeline close to the flue gas outlet; a lean gas inlet is arranged on a coke oven heating flue gas pipeline and is connected with a lean gas outlet on the reactor through a lean gas pipeline; a check valve is arranged on the lean gas pipeline;

2) in the operation process of the coke oven and the dry quenching furnace, high-temperature coke powder intercepted by the gravity settling action in the dry quenching primary dust remover falls into the reactor; opening a valve, starting an exhaust fan, pumping out coke oven flue gas in a coke oven flue and then sending the coke oven flue gas into a reactor; carbon dioxide with the volume content of 20-23 percent and oxygen with the volume content of 3-5 percent in the coke oven smoke react with high-temperature coke powder in a reactor to obtain high-temperature lean gas with the carbon monoxide volume content of more than 50 percent and the temperature of 300-700 ℃; supplying heat to the reactor through a supplementary heating device to keep the temperature in the reactor above 950 ℃;

3) high-temperature lean gas is introduced into a coke oven heating gas pipeline through a lean gas pipeline to be used as gas for supplementing heating of the coke oven, and a check valve is used for preventing the coke oven heating gas from reversely flowing into a reactor.

The ash hopper is provided with 3 charge level indicators along the height direction, wherein the charge level indicators are a high charge level indicator, a middle charge level indicator and a low charge level indicator respectively; the amount of the coke oven flue gas pumped into the reactor is controlled by adjusting the opening of the valve, so that the material level of the high-temperature coke powder is controlled between a high material level and a medium material level.

And pressure gauges are respectively arranged at the positions, close to the connection part of the blast furnace heating gas pipeline and the lean gas pipeline.

The valve is an electric valve, and the exhaust fan, the valve, the charge level indicator and the supplementary heating device are respectively connected with the control system.

Compared with the prior art, the invention has the beneficial effects that:

the high-temperature coke powder subjected to primary dust removal by dry quenching is reacted with carbon dioxide and oxygen in flue gas of a coke oven to obtain combustible gas containing carbon monoxide with higher concentration, and the combustible gas is used as coal gas for supplementing heating of the coke oven, is beneficial to increasing the temperature of the coal gas heated by the coke oven and reducing the heat consumption of the coke oven during coking.

Drawings

FIG. 1 is a process diagram of a method for preparing combustible gas by using dry quenching primary dedusting ash according to the invention.

FIG. 2 is a control schematic diagram of the method for preparing combustible gas by using dry quenching primary dedusting ash according to the invention.

In the figure: 1. coke oven 2, dry quenching furnace 3, dry quenching furnace primary dust remover 4, coke oven heating gas pipeline 5, coke oven flue 6, reactor 7, flue gas pipeline 8, lean gas pipeline 9, exhaust fan 10, valve 11, check valve 12, material level meter 13, pressure meter 14 and supplementary heating device

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings:

as shown in figure 1, the method for preparing combustible gas by using the dry quenching primary dedusting ash comprises the steps of pumping out part of coke oven smoke of a coke oven 1, sending the coke oven smoke to a primary dedusting system of a dry quenching furnace 2, reacting the coke oven smoke with high-temperature coke powder subjected to the dry quenching primary dedusting to generate high-temperature lean gas with carbon monoxide content of more than 50% and temperature of 300-700 ℃, introducing the high-temperature lean gas into a coke oven heating gas pipeline 4 to serve as supplementary heating gas for the coke oven 1, and increasing the temperature of the coke oven heating gas.

A method for preparing combustible gas by using dry quenching primary dedusting ash specifically comprises the following steps:

1) connecting the coke oven 1 with a primary dust removal system of a dry quenching furnace; a reactor 6 is arranged below an ash bucket in a primary dust remover 3 of the dry quenching furnace, the top of the reactor 6 is communicated with an ash outlet of the ash bucket, a flue gas inlet and a lean gas outlet are respectively arranged at two sides of the reactor 6, and a supplementary heating device is arranged at the bottom of the reactor; a flue gas outlet is arranged on a flue 5 of the coke oven and is connected with a flue gas inlet of a reactor 6 through a flue gas pipeline 7, an exhaust fan 9 is arranged on the flue gas pipeline 7, and a valve 10 is arranged on the flue gas pipeline 7 close to the flue gas outlet; a lean gas inlet is arranged on the coke oven heating flue gas pipeline 4 and is connected with a lean gas outlet on the reactor 6 through a lean gas pipeline 8; a check valve 11 is arranged on the lean gas pipeline 8;

4) in the operation process of the coke oven 1 and the dry quenching furnace 2, high-temperature coke powder intercepted by the gravity settling action in the dry quenching primary dust remover 3 falls into the reactor 6; opening a valve 10, starting an exhaust fan 9, pumping out the coke oven flue gas in the coke oven flue 5, and then sending the coke oven flue gas into the reactor 6; carbon dioxide with the volume content of 20-23 percent and oxygen with the volume content of 3-5 percent in the coke oven smoke react with high-temperature coke powder in a reactor 6 to obtain high-temperature lean gas with the volume content of carbon monoxide of more than 50 percent and the temperature of 300-700 ℃; supplying heat to the reactor 6 through a supplementary heating device 14 to keep the temperature in the reactor 6 above 950 ℃;

5) high-temperature lean gas is introduced into a coke oven heating gas pipeline 4 through a lean gas pipeline 8 to be used as supplementary heating gas for the coke oven 1, and a check valve 11 is used for preventing the coke oven heating gas from reversely flowing into a reactor 6.

The ash bucket is provided with 3 charge level indicators 12 along the height direction, namely a high charge level indicator, a middle charge level indicator and a low charge level indicator; the amount of the coke oven flue gas pumped into the reactor 6 is controlled by adjusting the opening degree of the valve 10, so that the material level of the high-temperature coke powder is controlled between a high material level and a medium material level.

And pressure gauges 13 are respectively arranged at the positions, close to the connection part of the blast furnace heating gas pipeline 4 and the lean gas pipeline 8, of the blast furnace heating gas pipeline and the lean gas pipeline.

The valve 10 is an electric valve, and the exhaust fan 9, the valve 10, the level gauge 12 and the supplementary heating device 14 are respectively connected with a control system.

The invention provides a method for preparing combustible gas by using dry quenching primary dedusting ash, which has the working principle that: a large amount of carbon dioxide and oxygen contained in the coke oven flue gas react with the high-temperature coke powder collected by the primary dust remover of the dry quenching oven to generate lean gas which is supplied to a coke oven heating system, so that the waste heat of the high-temperature coke powder in the primary dust remover of the dry quenching oven is effectively utilized, the use value of the coke powder is improved, and the heat consumption of the coke oven for coking is greatly reduced.

Firstly, a part of coke oven smoke is pumped into a reactor through an exhaust fan, so that high-temperature coke powder is promoted to react with carbon dioxide (the content is 20-23%) and oxygen (the content is 3-5%) in the coke oven smoke at the same time, and the coke powder settled by gravity in a primary dust remover of a dry quenching furnace is reacted to generate carbon monoxide. The carbon dioxide content and the oxygen content both refer to volume content.

Secondly, arranging a high-level material level meter, a middle-level material level meter and a low-level material level meter in an ash bucket of a primary dust remover of the dry quenching furnace, wherein the material level of high-temperature coke powder in the ash bucket is controlled between the high material level and the middle material level, so that the situation that the high-temperature coke powder enters a subsequent dry quenching boiler to scour boiler tubes due to overhigh material level is avoided, and the situation that coke oven flue gas directly enters the dry quenching furnace due to overlow high-temperature coke powder material level to cause severe pressure fluctuation of a dry quenching system is also avoided; the material level control of the high-temperature coke powder is mainly realized by adjusting the opening degree of a valve at the upstream of an exhaust fan, namely controlling the amount of the coke oven flue gas pumped into the reactor and controlling the amount of reaction substances in the reactor, and finally achieving the purpose of controlling the material level of the high-temperature coke powder (as shown in figure 2).

The gas after reaction contains more than 50% of carbon monoxide, and the temperature is 300-700 ℃, so that the gas can be used as lean gas; the part of the lean gas can be introduced into a heating gas pipeline of the coke oven through the lean gas pipeline and used as the supplementary heating gas of the coke oven. The back-flow valve and the pressure gauge are arranged on the coke oven heating gas pipeline to prevent the coke oven heating gas from reversely flowing into the reactor.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.