CN215250599U

CN215250599U - Coke oven waste gas returning and distributing and in-furnace denitration coupling system

Info

Publication number: CN215250599U
Application number: CN202121033104.4U
Authority: CN
Inventors: 张天宇; 肖长志; 杨俊峰; 韩龙
Original assignee: Acre Coking and Refractory Engineering Consulting Corp MCC
Current assignee: Acre Coking and Refractory Engineering Consulting Corp MCC
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-12-21
Anticipated expiration: 2031-05-14

Abstract

The utility model relates to a coke oven waste gas blending and in-furnace denitration coupling system, which comprises a waste gas blending pipeline, an ammonia pipeline and a gas circuit switching device; the waste gas return pipeline consists of a waste gas return main pipeline, a waste gas vertical pipe and a waste gas induced draft fan; the ammonia pipeline consists of an ammonia storage tank, an ammonia conveying pipeline, an ammonia vertical pipe and an ammonia draught fan; the gas path switching device consists of an exchange cock and an exchange cock switching device. The utility model discloses according to coke oven gas exchange system, let in regenerator blending area in turn through gas circuit auto-change over device control waste gas and ammonia, can effectively improve the stove in high to the heating condition to reduce the nitrogen oxide and generate.

Description

Coke oven waste gas returning and distributing and in-furnace denitration coupling system

Technical Field

The utility model relates to a coke oven production technical field especially relates to a coke oven waste gas returning charge and denitration coupled system in stove.

Background

At present, the denitration of the coking industry mostly adopts a mode of flue gas denitration outside a furnace, and mainly adopts non-selective catalytic reduction denitration (SNCR) or selective catalytic reduction denitration (SCR). The actual effects of the two denitration methods are closely related to the temperature, and the optimal temperature interval applied by the SNCR method is 800-1100 ℃; the optimum temperature interval for the application of the SCR process is below 450 ℃. The flue gas denitration mode outside the furnace needs to additionally build a denitration reactor, and the flue gas after denitration is input into a chimney through a fan and is discharged. The denitration method in the furnace is to utilize the coke oven body structure to mix NOx and reducing agent NH in the furnace₃Reacting to reduce it to N₂This way, the project construction investment can be greatly reduced.

The waste gas back-distribution technology is that the burnt waste gas is extracted from the branch flue of the coke oven, mixed with air, introduced into the small flue through the waste gas shutter, and sent into the combustion chamber through the regenerator for oxygen-deficient combustion, so that the high-direction heating uniformity can be effectively improved, the temperature in the furnace is reduced, and the generation of nitrogen oxides is reduced. Chinese patent application publication No. CN 111286346a discloses "flue gas recycling system and method for coke oven", chinese patent application publication No. CN 109957407a discloses "denitration of coke oven exhaust gas and improvement of heating device for coke oven", the outlets of the pipes of 2 technical solutions are all connected with an exhaust gas shutter, the arrangement way makes the exhaust gas introduced into the small flue of coke oven, and air and exhaust gas mixing is performed in the small flue of coke oven, because of the influence of on-way resistance, the mixing degree inside the small flue of coke oven is different, thereby influencing the gas proportion, leading to different combustion conditions in the vertical flame paths of each combustion chamber, and increasing the difficulty of production and fire adjustment.

The waste gas returns to join in marriage and the SNCR denitration method homoenergetic in the stove effectively reduces the formation of nitrogen oxide, and both require the operating mode different, consequently, need for one kind can be with the system of both couplings, realize accurate regulation mixing gas volume in production, cooperate coke oven gas exchange transmission, realize the overall process denitration.

The coke oven regenerator mainly comprises a main wall, a single wall, checker bricks and the like. The air flows in the heat storage chambers on the two sides of the main wall of the heat storage chamber are opposite, and the air flows in the heat storage chambers on the two sides of the single wall of the heat storage chamber are in the same flow direction; the ascending air flow in the heat accumulation chamber is air and combustion-supporting gas, and the descending air flow is combustion waste gas. Checker bricks are placed between the main wall of the heat storage chamber and the single wall of the heat storage chamber, and partition walls are arranged in the single heat storage chamber along the machine side-coke side direction to divide the heat storage chamber into cells.

The laying form of the checker bricks in the heat storage chamber provides a good environment for mixing the waste gas and the air, and the temperature of the waste gas flowing through the heat storage chamber conforms to the optimal temperature interval of the SNCR method applied in the furnace. Based on this, the utility model provides a coke oven waste gas returning and denitration coupled system and method in stove.

Disclosure of Invention

The utility model provides a coke oven waste gas returning charge and denitration coupled system in stove according to coke oven gas exchange system, lets in regenerator blending zone in turn through gas circuit auto-change over device control waste gas and ammonia, can effectively improve the interior height of stove to the heating condition to reduce nitrogen oxide and generate.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a coke oven waste gas blending and in-furnace denitration coupling system comprises a waste gas blending pipeline, an ammonia pipeline and a gas circuit switching device; the waste gas return pipeline consists of a waste gas return main pipeline, a waste gas vertical pipe and a waste gas induced draft fan; the ammonia pipeline consists of an ammonia storage tank, an ammonia conveying pipeline, an ammonia vertical pipe and an ammonia draught fan; the gas path switching device consists of an exchange cock and an exchange cock switching device;

the waste gas return main pipeline and the ammonia gas conveying pipeline are arranged in the underground chamber of the coke oven side by side along the longitudinal direction of the coke oven, one end of the waste gas return main pipeline is connected with an extraction opening of a gathering flue of the coke oven, and the other end of the waste gas return main pipeline is connected with a waste gas draught fan; one end of the ammonia gas conveying pipeline is connected with an ammonia gas storage tank, and the other end of the ammonia gas conveying pipeline is connected with an ammonia gas induced draft fan; a plurality of waste gas vertical pipes are arranged on the waste gas return main pipe in one-to-one correspondence with the single wall of the regenerator, and a plurality of ammonia gas vertical pipes are arranged on the ammonia gas conveying pipe in one-to-one correspondence with the single wall of the regenerator; the waste gas vertical pipe and the ammonia gas vertical pipe are arranged in parallel under the single wall of the regenerator; the waste gas vertical pipe and the ammonia gas vertical pipe are connected with a three-way pipe type exchange cock, the other outlet of the exchange cock is connected with a transverse branch pipe through a connecting pipe, and the transverse branch pipe is connected with the brick gas flow channel through a lower spray pipe; the brick airflow channel consists of a high-direction brick airflow channel and a transverse brick airflow channel, the high-direction brick airflow channel is arranged in the single wall of the heat storage chamber, the lower end of the high-direction brick airflow channel is connected with the lower spray pipe, the upper end of the high-direction brick airflow channel is connected with the middle part of the transverse brick airflow channel, the transverse brick airflow channel penetrates through the corresponding single wall of the heat storage chamber, and openings at two ends of the transverse brick airflow channel are opposite to the centers of the mixing areas of the heat storage chambers at two sides; the exchange cock switching device consists of a bevel gear set and a chain wheel chain transmission mechanism, wherein the chain is arranged along the longitudinal direction of the coke oven, the exchange cocks corresponding to the heat storage chambers are respectively connected with the chain wheel chain transmission mechanism through the corresponding bevel gear set, one bevel gear in the bevel gear set is coaxially connected with an angle valve in the exchange cock, and the other bevel gear is coaxially connected with the chain wheel; the rotation direction of the bevel gear set corresponding to the single wall of the single heat storage chamber is opposite to that of the bevel gear set corresponding to the single wall of the double heat storage chamber; the chain is connected with the coke oven exchange transmission device.

A pressure gauge and an expansion joint are arranged on the waste gas return main distribution pipeline, and a waste gas main valve is arranged at one end close to a gas taking port of a gathering flue of the coke oven.

The ammonia gas conveying pipeline is provided with a pressure gauge and an expansion joint, and the joint of the ammonia gas conveying pipeline and the ammonia gas storage tank is provided with an ammonia gas main valve.

And according to the flow direction of the gas flow, the waste gas vertical pipe is sequentially provided with a regulating cock, a hole plate box and a flowmeter.

And according to the flow direction of the gas flow, a regulating cock, a pore plate box and a flowmeter are sequentially arranged on the ammonia gas vertical pipe.

An angle valve with a lubricating oil cup is arranged in the exchange cock, the exchange cock is of a three-way pipe structure, openings at two ends of the exchange cock are respectively connected with the waste gas vertical pipe and the ammonia gas vertical pipe, and an opening at the top of the exchange cock is connected with the connecting pipe; and a gear box is arranged on the outer side of the helical gear set.

The brick airflow channel is formed by building or splicing tubular refractory materials.

The regenerative chamber is divided into 3 regions according to the working temperature, and the regions are respectively as follows: a low-temperature zone below 800 ℃, a regenerator blending zone at 800-1000 ℃ and a high-temperature zone above 1000 ℃; checker bricks are filled in the low-temperature area and the high-temperature area, and the regenerator blending area is not filled with the checker bricks; the single heat storage chamber forms a grid structure through a plurality of partition walls.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the denitration function and the waste gas return function in the furnace are coupled in the same system, and the return waste gas is mixed with air in the process that the ascending air flow flows through the mixing region in the heat storage chamber, so that oxygen-deficient combustion is carried out in the combustion chamber, and the high-direction heating condition in the furnace is effectively improved; during the process that the downdraft flows through the mixing zone of the regenerator, the SNCR denitration reaction is carried out by ammonia injection, so that the generation of nitrogen oxides is effectively reduced; the utility model realizes the reduction of nitrogen oxide generation in the whole process of coke oven production;

2) the air quantity entering each regenerator is accurately controlled by arranging the adjusting cock and the pore plate, and data monitoring can be realized by matching with a flowmeter and a pressure gauge; aiming at the working condition of updraft, the mixing proportion of waste gas can be adjusted according to the combustion condition in the corresponding combustion chamber above the regenerator; aiming at the working condition of downdraft, the denitration efficiency can be controlled by adjusting the flow of ammonia gas, and the excessive ammonia gas is prevented;

3) the exchange cock is matched with the bevel gear set, is connected with the coke oven gas exchange transmission device through the chain wheel and chain transmission mechanism, realizes linkage with the heating reversing of the coke oven, and changes the gas introduced into the blending region of the regenerator through the exchange cock; the labor intensity of operators is effectively reduced, and the accident rate is reduced;

4) the same number of brick airflow channels are arranged in the single wall of the regenerator according to the division number of the regenerator, and the brick airflow channels are arranged in the single wall of the regenerator, so that gas leakage caused by high temperature can be effectively prevented, and the construction of an external pipeline is reduced; and a regenerator blending area is arranged in each regenerator cell, so that the gas blending efficiency is improved.

Drawings

FIG. 1 is a schematic structural diagram of a coke oven exhaust gas recycling and denitration coupling system in a furnace according to the present invention.

FIG. 2 is a schematic view of a partial three-dimensional structure of a coke oven exhaust gas recycling and denitration coupling system in a furnace.

Fig. 3 is a schematic structural diagram of the gas circuit switching device of the present invention.

FIG. 4 is a schematic structural view of a regenerative chamber of a coke oven according to the present invention.

In the figure: 1. waste gas return distribution main pipe 2, ammonia gas conveying pipe 3, adjusting cock 4, orifice plate box 5, angle valve 6, gear box 7, bevel gear set 8, connecting pipe 9, transverse branch pipe 10, lower spray pipe 11, chain 12, chain wheel 13, ammonia gas storage tank 14, exchanging cock 15, regenerator main wall 16, regenerator single wall 17, brick gas flow passage 18, regenerator blending area 19, coke oven small flue 20, lattice brick 21, coke oven gathering flue 22, partition wall 23, waste gas draught fan 24 and ammonia draught fan 24

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in fig. 1 and 2, the coke oven exhaust gas recycling and denitration coupling system of the present invention comprises an exhaust gas recycling pipeline, an ammonia pipeline and a gas circuit switching device; the waste gas return distribution pipeline consists of a waste gas return distribution main pipeline 1, a waste gas vertical pipe and a waste gas induced draft fan 23; the ammonia pipeline consists of an ammonia storage tank 13, an ammonia conveying pipeline 2, an ammonia vertical pipe and an ammonia draught fan 24; the gas path switching device consists of an exchange cock 14 and an exchange cock switching device;

the waste gas return main pipeline 1 and the ammonia gas conveying pipeline 2 are arranged in the underground chamber of the coke oven side by side along the longitudinal direction of the coke oven, one end of the waste gas return main pipeline 1 is connected with an extraction opening of a coke oven gathering flue 21, and the other end is connected with a waste gas induced draft fan 23; one end of the ammonia gas conveying pipeline 2 is connected with an ammonia gas storage tank 13, and the other end of the ammonia gas conveying pipeline is connected with an ammonia gas induced draft fan 24; a plurality of waste gas vertical pipes are arranged on the waste gas return main pipe 1 and correspond to the single wall 16 of the regenerator one by one, and a plurality of ammonia gas vertical pipes are arranged on the ammonia gas conveying pipe 2 and correspond to the single wall 16 of the regenerator one by one; the waste gas vertical pipe and the ammonia gas vertical pipe are arranged in parallel under the single wall 16 of the regenerator; the waste gas upright pipe and the ammonia gas upright pipe are connected with a three-way pipe type exchange cock 14, the other outlet of the exchange cock 14 is connected with a transverse branch pipe through a connecting pipe 8, and the transverse branch pipe 9 is connected with a brick air flow channel 17 through a lower spray pipe 10; the brick airflow channel 17 consists of a high-direction brick airflow channel and a transverse brick airflow channel, the high-direction brick airflow channel is arranged in the regenerator single wall 16, the lower end of the high-direction brick airflow channel is connected with the lower spray pipe 10, the upper end of the high-direction brick airflow channel is connected with the middle part of the transverse brick airflow channel, the transverse brick airflow channel penetrates through the corresponding regenerator single wall 16, and openings at two ends of the transverse brick airflow channel are opposite to the centers of regenerator mixing areas at two sides; as shown in fig. 3, the exchange cock switching device is composed of a helical gear set 7 and a chain wheel chain transmission mechanism, wherein a chain 11 is arranged along the longitudinal direction of the coke oven, the exchange cocks 14 corresponding to each regenerator are respectively connected with the chain wheel chain transmission mechanism through the corresponding helical gear set 7, one helical gear in the helical gear set 7 is coaxially connected with an angle valve in the exchange cock 14, and the other helical gear is coaxially connected with a chain wheel 12; the rotation direction of the bevel gear set 7 corresponding to the single wall of the single heat storage chamber is opposite to that of the bevel gear set 7 corresponding to the single wall of the double heat storage chamber; the chain 11 is connected with a coke oven exchange transmission device.

A pressure gauge and an expansion joint are arranged on the waste gas return main distribution pipeline 1, and a waste gas main valve is arranged at one end close to an air intake of a coke oven gathering flue 21.

The ammonia gas conveying pipeline 2 is provided with a pressure gauge and an expansion joint, and the joint of the ammonia gas conveying pipeline and the ammonia gas storage tank 13 is provided with an ammonia gas main valve.

And a regulating cock 3, an orifice plate box 4 and a flowmeter are sequentially arranged on the waste gas vertical pipe according to the flow direction of the gas flow.

And a regulating cock 3, an orifice plate box 4 and a flowmeter are sequentially arranged on the ammonia gas vertical pipe according to the flow direction of the gas flow.

An angle valve 5 with a lubricating oil cup is arranged in the exchange cock 14, the exchange cock 14 is of a three-way pipe structure, openings at two ends of the exchange cock are respectively connected with a waste gas vertical pipe and an ammonia gas vertical pipe, and an opening at the top of the exchange cock is connected with a connecting pipe 8; and a gear box 6 is arranged on the outer side of the bevel gear set 7.

The brick airflow channel 17 is formed by building or splicing tubular refractory materials.

As shown in fig. 4, the regenerator is divided into 3 zones according to the operating temperature, which are: a low-temperature zone below 800 ℃, a regenerator blending zone 18 between 800 ℃ and 1000 ℃, and a high-temperature zone above 1000 ℃; checker bricks 20 are filled in the low-temperature region and the high-temperature region, and the regenerator blending region 18 is not filled; the individual regenerators form a cellular structure by means of several partitions 22.

The working method of the coke oven waste gas back-distribution and in-oven denitration coupling system is as follows:

1) according to the coke oven gas exchange system, rotating an angle valve 5 in an exchange cock 14 through an exchange cock switching device;

2) when ascending air flow exists in the heat storage chambers on the two sides of the single wall 16 of the corresponding heat storage chamber, the waste gas vertical pipe is communicated with the connecting pipe 8, the returned waste gas is distributed to the lower spray pipes 10 through the transverse branch pipe 9, and the returned waste gas is directly sent to the heat storage chamber mixing area 18 through the brick airflow channel 17; in the process that the ascending air flow flows through the regenerator blending zone 18, the waste gas is blended with air, so that oxygen-deficient combustion is carried out in the combustion chamber, and the uniformity of the furnace height direction heating is improved;

3) when downward airflow is generated in the heat storage chambers on the two sides of the single wall 16 of the corresponding heat storage chamber, the ammonia gas vertical pipe is communicated with the connecting pipe 8, the ammonia gas is distributed to the lower spray pipes 10 through the transverse branch pipe 9, and the ammonia gas is directly sent to a heat storage chamber mixing area 18 through the brick airflow channel 17; in the process that the downdraft flows through the regenerator blending zone 18, the ammonia is blown to carry out SNCR denitration reaction, thereby reducing the generation of nitrogen oxides.

The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples. Any person skilled in the art should be able to substitute or change the technical solution of the present invention and the inventive concept equally within the technical scope of the present invention.

[ examples ] A method for producing a compound

Before the top plate of the coke oven is poured, the lower spray pipe 10 is embedded in the center of a regenerative chamber cell along the center line of the single wall 16 of the regenerative chamber.

When the regenerator is built, the regenerator is divided into three parts along the high direction according to a predesigned working temperature interval of the regenerator, wherein the three parts are a low-temperature region lower than 800 ℃, a regenerator mixing region 18 between 800 and 1000 ℃ and a high-temperature region higher than 1000 ℃. The low temperature area and the high temperature area are filled with the checker bricks 20, and the regenerator blending area 18 is not filled with any object, thereby providing a sufficient space for gas blending.

A plurality of partition walls 22 are built in the single regenerator along the machine-coke side direction, and the partition walls 22 are arranged between the regenerator main wall 15 and the regenerator single wall 16 to divide the single regenerator. A high-direction brick airflow channel is built in the single wall 16 of the regenerator along the high direction by using tubular bricks, the top end of the high-direction brick airflow channel is positioned at the central position of the blending region 18 of the regenerator, a horizontal transverse brick airflow channel is built at the top of the high-direction brick airflow channel, and two ends of the transverse brick airflow channel penetrate through the single wall 16 of the regenerator to form a three-way form.

A waste gas return main pipe 1 is laid on a basement of the coke oven along the central line of the coke oven, a waste gas taking port is positioned at the top of a gathering flue 21 of the coke oven, a pressure gauge is arranged on the waste gas return main pipe 1 close to one end of the taking port, and the terminal of the waste gas return main pipe 1 is connected with a waste gas draught fan 23. The ammonia conveying pipeline 2 and the waste gas return main distribution pipeline 1 are arranged side by side, one end of the ammonia conveying pipeline is connected with an ammonia draught fan 24, the other end of the ammonia conveying pipeline is connected with an ammonia storage tank 13, and a pressure gauge is installed at the connection position. Along the air current direction, set up pressure gauge, expansion joint on waste gas return main pipe 1 and the ammonia pipeline 2 respectively, a plurality of holes are seted up under corresponding regenerator single wall 16 to waste gas return main pipe 1, ammonia pipeline 2, and corresponding waste gas upright tube, the ammonia upright tube of trompil department welding, waste gas upright tube, ammonia upright tube all set up with regenerator single wall 16 one-to-one. The waste gas vertical pipe and the ammonia gas vertical pipe are sequentially provided with an adjusting cock 3, an orifice plate box 4 and a flowmeter along the airflow direction, the waste gas vertical pipe and the ammonia gas vertical pipe which are arranged in parallel are oppositely arranged through a bent pipe, and an exchange cock 14 is arranged between the waste gas vertical pipe and the ammonia gas vertical pipe.

An angle valve 5 with a lubricating oil cup is arranged inside the exchange cock 14, a gear box 6 is arranged on the front face of each exchange cock 14, the lubricating oil cup and a bevel gear set 7 are installed in the gear box 6, the axes of 2 bevel gears are vertically meshed with each other, one bevel gear is connected with an installation shaft of the angle valve in the exchange cock 14 through a pin, and the other bevel gear is connected with a mounting shaft of a chain wheel through a pin. The gear rotating directions of the helical gear sets 7 in the adjacent 2 gear boxes 6 are opposite, namely if the regenerator single walls 16 are grouped according to a single-double number, the gear rotating direction of the helical gear set 7 corresponding to the single-double number regenerator single wall is opposite to the gear rotating direction of the helical gear set 7 corresponding to the double-double number regenerator single wall; the chain 11 is connected with the coke oven exchange transmission device, and when the coke oven exchange transmission device acts, the chain 11 drives the corresponding chain wheel 12 and the bevel gear set 7 to act, so that the following functions are finally realized:

1) when an ascending air current is flowing in the heat storage chamber, the exhaust gas upright pipe is communicated with the connecting pipe 8 by rotating the angle valve 5 in the exchange cock 14.

2) When the down stream is in the heat accumulation chamber, the angle valve 5 in the exchange cock 14 is rotated to connect the ammonia gas upright pipe with the connecting pipe 8.

The top opening of the exchange cock 14 is connected with a connecting pipe 8, the connecting pipe 8 is connected with a transverse branch pipe 9, and the transverse branch pipe 9 is arranged under the regenerator single wall 16 along the coke side-coke side direction of the coke oven and is arranged corresponding to the regenerator single wall 16 one by one. The top surface of the transverse branch pipe 9 is provided with holes, the number of which is equal to the number of the cells of the regenerator, and the holes are connected with the lower spray pipes 10 in the single wall 16 of the regenerator.

After the waste gas returning and denitration coupling system in the furnace is installed, the tightness of the pipeline needs to be tested by pressing. Then, all the adjusting cocks 3 are completely closed, the orifice box 4 is opened to place the orifice, and whether the coke oven exchange transmission device can drive all the exchange cocks 14 to complete the gas reversing action is checked.

When the coke oven is in production, a large waste gas draught fan 23 and an ammonia draught fan 24 are gradually opened, whether pressure gauges on the waste gas return main pipeline 1 and the ammonia conveying pipeline 2 are normal or not is checked, and meanwhile, each adjusting cock 3 is opened. According to the flow rates shown by flow meters on the waste gas vertical pipe and the ammonia gas vertical pipe, the opening degree and the pore plate model of each adjusting cock 3 are reasonably adjusted by combining the combustion condition in the furnace and the monitoring data.

When the ascending air flow exists in the heat accumulation chamber on one side of the heat accumulation chamber main wall 15, the coke oven exchange transmission device drives the corresponding bevel gear set 7 to rotate in the forward direction through the chain 11 and the corresponding chain wheel 12, so that the angle valve 5 in the exchange cock 14 rotates, the waste gas vertical pipe is communicated with the connecting pipe 8, the returned waste gas passes through the returned waste gas main pipe 1, the waste gas vertical pipe, the connecting pipe 8, the transverse branch pipe 9, the lower spray pipe 10 and the brick air flow channel 17, and is finally mixed with air in the coke oven heat accumulation chamber mixing area 18 to reduce the oxygen content of the combustion-supporting gas. At this time, a descending air flow is arranged in the heat accumulation chamber on the other side of the heat accumulation chamber main wall 15, when the chain 11 is in transmission, the corresponding bevel gear set 7 is driven to rotate reversely through the corresponding chain wheel 12, so that the ammonia vertical pipe is communicated with the connecting pipe 8, and the ammonia finally generates a reduction reaction with the combusted gas in the corresponding heat accumulation chamber mixing area 18 through the ammonia conveying pipeline 2, the ammonia vertical pipe, the connecting pipe 8, the transverse branch pipe 9, the lower spray pipe 10 and the brick air flow channel 17, so as to reduce the generation of nitrogen oxides.

The waste gas vertical pipe is used for leading out the returned waste gas in the waste gas return main pipe 1, the regulating cock 3 is used for controlling the waste gas flow in the corresponding waste gas vertical pipe, the pore plate in the pore plate box 4 is used for controlling the waste gas flow in the corresponding waste gas vertical pipe, and the flow meter is used for monitoring the waste gas flow in the corresponding waste gas vertical pipe.

The ammonia vertical pipe is used for leading out ammonia in the ammonia conveying pipeline 2, the adjusting cock 3 is used for controlling the flow of the ammonia in the corresponding ammonia vertical pipe, the orifice plate in the orifice plate box 4 is used for controlling the flow speed of the ammonia in the corresponding ammonia vertical pipe, and the flow meter is used for monitoring the flow of the ammonia in the corresponding ammonia vertical pipe.

The adjusting cock 3 can be opened and closed manually or mechanically and is used for adjusting the gas flow. The upper part of the adjusting cock 3 is provided with a pore plate box 4, and the gas flow rate can be controlled by adjusting the size of the pore plate under the condition that the gas flow is not changed.

The lower spray pipe 10 is arranged in the top plate of the coke oven, the upper end of the lower spray pipe is connected with a brick airflow channel 17 in a single wall 16 of a regenerator, and the lower end of the lower spray pipe is connected with a transverse branch pipe 9. The number of the lower spray pipes 10 connected with each transverse branch pipe 9 is the same as the number of the grids of the regenerative chambers of the coke oven, and the lower spray pipes 10 are used for distributing the gas in the transverse branch pipes 9 to each high-direction brick gas flow channel.

The brick airflow channels 17 are arranged in the regenerator single wall 16, and the number of the brick airflow channels is equal to the number of the cells of the coke oven regenerator. The high-direction brick airflow channels are arranged along the height direction of the regenerator single wall 16, each high-direction brick airflow channel is arranged between partition walls 22 of the two coke oven regenerators, the lower ends of the high-direction brick airflow channels are communicated with the lower spray pipe 10, and the upper ends of the high-direction brick airflow channels are connected with the transverse brick airflow channels. The transverse brick airflow channel penetrates through the single wall 16 of the regenerator, and openings at two ends of the transverse brick airflow channel are opposite to the center of the blending area 18 of the regenerator and are used for sending waste gas or ammonia gas into the blending area 18 of the regenerator.

The brick airflow channel 17 is made of tubular refractory materials and is constructed together with the single wall 16 of the regenerative chamber of the coke oven in a masonry mode or a splicing mode.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A coke oven waste gas blending and in-furnace denitration coupling system is characterized by comprising a waste gas blending pipeline, an ammonia pipeline and a gas circuit switching device; the waste gas return pipeline consists of a waste gas return main pipeline, a waste gas vertical pipe and a waste gas induced draft fan; the ammonia pipeline consists of an ammonia storage tank, an ammonia conveying pipeline, an ammonia vertical pipe and an ammonia draught fan; the gas path switching device consists of an exchange cock and an exchange cock switching device;

2. The coke oven waste gas distribution and denitration coupling system as claimed in claim 1, wherein a pressure gauge and an expansion joint are arranged on the main waste gas distribution pipeline, and a main waste gas valve is arranged at one end close to an air intake of a coke oven collecting flue.

3. The coke oven waste gas blending and in-furnace denitration coupling system of claim 1, wherein a pressure gauge and an expansion joint are arranged on the ammonia gas delivery pipeline, and an ammonia gas main valve is arranged at the joint of the ammonia gas delivery pipeline and the ammonia gas storage tank.

4. The coke oven waste gas back-distribution and in-furnace denitration coupling system of claim 1, wherein a regulating cock, a perforated plate box and a flow meter are sequentially arranged on the waste gas upright tube according to the flow direction of the gas.

5. The coke oven waste gas back-distribution and in-furnace denitration coupling system of claim 1, wherein a regulating cock, a perforated plate box and a flow meter are sequentially arranged on the ammonia gas vertical pipe according to the flow direction of the gas flow.

6. The coke oven waste gas blending and denitration coupling system as claimed in claim 1, wherein an angle valve with a lubricating oil cup is arranged in the exchange cock, the exchange cock is of a three-way pipe structure, two openings are respectively connected with the waste gas vertical pipe and the ammonia gas vertical pipe, and the top opening is connected with the connecting pipe; and a gear box is arranged on the outer side of the helical gear set.

7. The coke oven exhaust gas back-distribution and in-furnace denitration coupling system of claim 1, wherein the brick gas flow channel is formed by masonry or splicing of tubular refractory materials.