CN115806828A - Reheating coke oven system and waste gas return method thereof - Google Patents
Reheating coke oven system and waste gas return method thereof Download PDFInfo
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- CN115806828A CN115806828A CN202211649485.8A CN202211649485A CN115806828A CN 115806828 A CN115806828 A CN 115806828A CN 202211649485 A CN202211649485 A CN 202211649485A CN 115806828 A CN115806828 A CN 115806828A
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Abstract
The invention relates to a compound heat type coke oven system and a waste gas return method thereof, wherein the compound heat type coke oven system comprises a mixed gas supply unit, a coke oven gas supply unit, a waste gas shutter, a coke oven body and a waste gas supply unit; the waste gas feeding unit consists of a waste gas main pipe, a variable frequency fan, a fan inlet regulating valve and a waste gas switch valve; one end of the waste gas main pipe is connected with the smoke distributing channel of the coke oven, and the other end of the waste gas main pipe is connected with the mixed gas main pipe in the mixed gas supply unit or directly connected with the waste gas shutter; a fan inlet adjusting valve, a variable frequency fan and a waste gas switch valve are sequentially arranged on the waste gas main pipe along the flow direction of waste gas. By feeding the waste gas into the coal gas regenerator, the air feeding amount at the bottom of the vertical flue is reduced while the temperature segregation of the regenerator is avoided, and the low-nitrogen emission of the reheat coke oven heated by the coke oven gas is realized.
Description
Technical Field
The invention relates to the technical field of a reheating coke oven, in particular to a reheating coke oven system and a waste gas return-distribution method thereof.
Background
With the national emphasis on environmental protection, the requirements of steel and iron united enterprises and independent coking enterprises on energy conservation and emission reduction of coke ovens are higher and higher. In the existing large coke oven in China, in order to control the combustion temperature in the vertical flue and improve the high-direction heating uniformity in the vertical flue, structural forms such as high and low lamp heads, waste gas circulation, sectional heating and the like are mostly adopted. Coke ovens of iron and steel integrated enterprises mainly adopt lean gas for heating, but rich gas is used for heating in the early period of production or during maintenance of a lean gas system, so that a recuperative coke oven which can be heated by both lean gas and rich gas is usually adopted; independent coking enterprises generally adopt a single-heat type coke oven heated by rich gas, but some independent coking enterprises also adopt a compound-heat type coke oven in order to reserve a lean gas heating system.
When the reheating coke oven is heated by rich gas, air is introduced into an original gas heat storage chamber, lean gas outlets at the bottom of the vertical flue and on a partition wall of the vertical flue become air outlets, the excess air causes the excess air coefficient at the bottom of the vertical flue to be close to or even far larger than 1, the combustion temperature is high, a large amount of nitrogen oxides are generated in the high-temperature area, the concentration of the nitrogen oxides in the coke oven waste gas can even be as high as 800mg/m & lt 3 & gt, and the nitrogen oxides far exceed the industrial emission standard. Meanwhile, due to the limitation of high temperature in the furnace body structure and the vertical flue, the adjusting brick at the gas outlet of the vertical flue is difficult to adjust, and the adjusting brick is not adjusted in the general production process. Furthermore, the amount of air entering the gas regenerator must not be too small, which would otherwise cause temperature segregation in the adjacent regenerators. Therefore, the bottom air supply amount of the single-heat type coke oven is also relatively high, and the nitrogen oxide production amount of the single-heat type coke oven is also higher than that of the coke oven heated by lean gas. Therefore, the high NOx production of coke ovens (particularly, reheat coke ovens) when heated with coke oven gas is a problem facing industry alike. In order to ensure that the emission of the coke oven reaches the standard, a denitration process can be added only after the coke oven, so that the construction cost and the production cost are greatly improved.
Chinese patent application publication No. CN 108774537A discloses "a low nitrogen emission reheat type coke oven heating system and its regulating method", the coke oven heating system includes a small flue, controllable heat exchange channels, gas channels, and a combustion chamber, the gas channels correspond to the controllable heat exchange channels one by one, the controllable heat exchange channels include a controllable lean gas heat exchange channel and a controllable air heat exchange channel; the bottoms of the controllable air heat exchange channel and the controllable lean gas heat exchange channel are respectively connected with the corresponding small flues, the small flue connecting pipe corresponding to the controllable air heat exchange channel is provided with an air inlet hole, the small flue connecting pipe corresponding to the controllable lean gas heat exchange channel is provided with a lean gas inlet hole and an air inlet hole, and the air inlet hole and the lean gas inlet hole are respectively provided with an air inlet flow regulating device. The Chinese patent application with the application publication number of CN 113122284A discloses a method for regulating low nitrogen emission of a recuperative coke oven, which comprises the following steps: 1) Arranging the adjusting bricks according to a lean gas heating mode; 2) When rich gas is adopted for heating, one or more segmented air outlets and/or lean gas outlets in the vertical flame path are blocked by the adjusting bricks, so that the quantity of combustion-supporting air entering the bottom, middle and upper parts of the vertical flame path can be independently and quantitatively adjusted, and low nitrogen emission during rich gas heating is realized; 3) When the lean gas is used for heating, the adjusting bricks used for plugging the air outlet or the lean gas outlet in the step 2) are moved away, the initial state of the adjusting bricks arranged according to the lean gas heating mode is recovered, and low nitrogen emission during the lean gas heating is realized. The 2 technical schemes are that a heating system is changed, and the regenerators are in one-to-one correspondence with gas outlets at the bottom and the middle/upper part of the vertical flue, so that the quantity of combustion-supporting air or coal gas entering the bottom and the middle/upper part of the vertical flue can be independently and quantitatively adjusted, and the generation of nitrogen oxides is effectively reduced. However, the two technical schemes are realized by changing the heating system of the coke oven and even the original structure of the coke oven, so that certain difficulty and risk are caused in implementation. In particular, for coke ovens already in production, the coke oven structure has been determined to be difficult to achieve again by modifying the coke oven structure to achieve low nitrogen emissions.
Disclosure of Invention
The invention provides a compound heat type coke oven system and a waste gas return method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kind of compound heat type coke oven system, including mixed gas supply unit, coke oven gas supply unit, waste gas shutter and coke oven body, wherein the coke oven body includes small flue, regenerator, chute, combustion chamber, charring chamber and furnace roof; the reheating coke oven system also comprises a waste gas feeding unit; the waste gas supply unit consists of a waste gas main pipe, a variable frequency fan, a fan inlet regulating valve and a waste gas switch valve; one end of the waste gas main pipe is connected with the smoke distributing channel of the coke oven, the other end of the waste gas main pipe is connected with the mixed gas main pipe in the mixed gas supply unit, or the other end of the waste gas main pipe is directly connected with the waste gas shutter; a fan inlet adjusting valve, a variable frequency fan and a waste gas switch valve are sequentially arranged on the waste gas main pipe along the flow direction of waste gas.
And a mixed gas switch valve is arranged on the upstream of the access point of the waste gas main pipe in the mixed gas main pipe.
The mixed gas main pipe is connected with the corresponding gas heat accumulation chambers through a plurality of gas branch pipes, and the gas branch pipes are provided with adjusting cocks and exchange cocks.
The waste gas main pipe is provided with a plurality of expansion joints.
And a heat insulation layer is arranged outside the waste gas main pipe.
The coke oven body adopts a structure of multi-section heating of air and coal gas.
A waste gas return method of a compound heat type coke oven system is disclosed, when the coke oven is heated by mixed gas, a waste gas switch valve on a waste gas main pipe is closed, and a waste gas feeding unit does not participate in the production process of the coke oven; when the coke oven is heated by adopting coke oven gas, the mixed gas switch valve is closed, and the supply of the mixed gas is cut off; the waste gas switch valve on the waste gas main pipe is opened, air enters the air heat storage chamber through the waste gas shutter, and waste gas in the coke oven branch flue enters the coal gas heat storage chamber through the waste gas main pipe, is preheated by the coal gas heat storage chamber and then enters the combustion chamber vertical flame path.
Compared with the prior art, the invention has the beneficial effects that:
(1) When the reheating coke oven is heated by adopting coke oven gas, air enters an air regenerator through a waste gas shutter for preheating and then enters a vertical flue; waste gas is preheated by the gas regenerator and then enters the bottom or the middle upper part of the vertical flue through a mixed gas outlet in the vertical flue, so that local high temperature generated by excessive air supplied to the bottom of the vertical flue for peroxy combustion is avoided, and the generation of nitrogen oxides is reduced; meanwhile, the waste gas is fed to dilute the fed air and the combusted coal gas, so that the concentration of combustible components is reduced, and the generation of nitrogen oxides is further reduced; in addition, waste gas is supplied from the bottom of the vertical flue, which is equivalent to increase of the circulation quantity of the waste gas, so that the purpose of lengthening flame can be achieved, and the high-direction heating uniformity of the vertical flue is improved;
(2) When the complex heating type coke oven is heated by adopting coke oven gas, in order to reduce the generation of nitrogen oxides, the air supply quantity of a gas regenerator is usually reduced, so that the temperature of the gas regenerator is higher than that of an adjacent air regenerator, namely, temperature segregation is generated, and the production of the coke oven is influenced; the invention replaces air with waste gas to supply to the coal gas regenerator, reduces the generation of oxides of nitrogen in the vertical flue, solves the problem of temperature segregation in the regenerator, and can adjust the supply amount of the waste gas according to the temperature condition of the regenerator;
(3) The waste gas feeding unit is connected with the mixed gas main pipe in the original mixed gas feeding unit, so that the waste gas can enter the gas heat accumulation chamber through the mixed gas main pipe, the gas regulating valve and the gas branch pipe, and the reversing operation can be performed by utilizing an exchange transmission device of the mixed gas, thereby saving a large amount of equipment investment;
(4) On the premise of not changing the structure of the existing coke oven, the problem that the reheating coke oven is difficult to realize low-nitrogen combustion of lean gas and rich gas can be solved only by adding the waste gas feeding unit, and the common problem of high emission of nitrogen oxides when the rich gas is adopted for heating is solved, so that the reheating coke oven is suitable for a newly built coke oven and a coke oven which is already put into production;
(5) By changing the supply amount of the waste gas, the high-direction heating uniformity of the coke oven can be changed, the emission of nitrogen oxides of the coke oven is reduced, and even the emission reaching the standard can be realized without a subsequent denitration process, so that the aims of saving energy and reducing emission of the coke oven are fulfilled; the operation is simple and convenient, the operation of workers in severe environment is avoided, and the labor intensity is reduced.
Drawings
FIG. 1 is a schematic view of a recuperative coke oven system of the present invention.
Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.
In the figure: 1. small flue 2, heat storage chamber 21, gas heat storage chamber 22, air heat storage chamber 3, chute 4, combustion chamber 5, furnace top 6, waste gas shutter 61, air door 7, mixed gas feeding unit 71, mixed gas main pipe 72, adjusting cock 73, exchanging cock A74, exchanging cock B75, mixed gas switch valve 8, coke oven gas feeding unit 9, waste gas feeding unit 91, waste gas switch valve 92, variable frequency fan 93, fan inlet adjusting valve 94, waste gas main pipe 10, coke oven branch flue
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1 and 2, the reheating coke oven system of the present invention comprises a mixed gas feeding unit 7, a coke oven gas feeding unit 8, an exhaust gas shutter 6 and a coke oven body, wherein the coke oven body comprises a small flue 1, a regenerator 2, a chute 3, a combustion chamber 4, a carbonization chamber and an oven top 6; the reheating coke oven system also comprises an exhaust gas feeding unit 9; the waste gas supply unit 9 consists of a waste gas main pipe 94, a variable frequency fan 92, a fan inlet regulating valve 93 and a waste gas switch valve 91; one end of the waste gas main pipe 94 is connected with the coke oven sub-flue 10, the other end of the waste gas main pipe 94 is connected with the mixed gas main pipe 71 in the mixed gas supply unit 7, or the other end of the waste gas main pipe 94 is directly connected with the waste gas shutter 6; a fan inlet regulating valve 93, a variable frequency fan 92 and a waste gas switch valve 91 are sequentially arranged on the waste gas main pipe 94 along the flow direction of waste gas.
The mixed gas main pipe 71 is provided with a mixed gas on-off valve 75 upstream of the access point of the exhaust gas main pipe 94.
The mixed gas main pipe 71 is connected with the corresponding gas heat accumulation chambers 21 through a plurality of gas branch pipes, and the gas branch pipes are provided with adjusting cocks 72 and exchange cocks (comprising an exchange cock A73 and an exchange cock B74).
The exhaust main 94 is provided with a plurality of expansion joints.
The outside of the exhaust main pipe 94 is provided with an insulating layer.
The coke oven body adopts a structure of multi-section heating of air and coal gas.
A waste gas return method of a compound heat type coke oven system, when the coke oven adopts the mixed gas to heat, the waste gas switch valve 91 on the main pipe 94 of waste gas is closed, the waste gas supplies the unit 9 and does not participate in the production process of the coke oven; when the coke oven is heated by coke oven gas, the mixed gas switch valve 75 is closed, and the supply of the mixed gas is cut off; the waste gas switch valve 91 on the waste gas main pipe 94 is opened, air enters the air heat storage chamber 22 through the waste gas switch 6, waste gas of the coke oven branch flue 10 enters the gas heat storage chamber 21 through the waste gas main pipe 94, and enters the combustion chamber vertical flame path after being preheated by the gas heat storage chamber 21.
The invention relates to a compound heat type coke oven system which comprises a mixed gas feeding unit 7, a coke oven gas feeding unit 8, an exhaust gas shutter 6 and a coke oven body, wherein the coke oven body comprises a small flue 1, a regenerative chamber 2, a chute 3, a combustion chamber 4, a carbonization chamber and an oven top 5. The compound heat type coke oven (hereinafter referred to as coke oven) can be heated by adopting both lean gas and rich gas. The waste gas feeding unit 9 is added on the basis of the original compound heat type coke oven system, and when the coke oven is heated by adopting mixed gas, the waste gas feeding unit 9 is closed; when the coke oven is heated by coke oven gas, the supply of mixed gas is cut off, the waste gas supply unit 9 is opened, air enters the air regenerator 22 through the waste gas shutter 6, and waste gas enters the gas regenerator 21 through the waste gas supply unit 9, and enters the vertical flame path after being preheated by the gas regenerator 21, so that the peroxy combustion in the vertical flame path is avoided, and the generation of nitrogen oxides is reduced.
In the waste gas supply unit 9, one end of a waste gas main pipe 94 is connected with an air intake port of the coke oven branch flue 10, and the other end is connected with a mixed gas main pipe 71 in the mixed gas supply unit 7, and waste gas is supplied to the coke oven by the existing mixed gas supply unit 7 and the exchange transmission device.
The waste gas supply unit 9 is composed of a waste gas main pipe 94, a variable frequency fan 92, a valve and other devices, the total supply amount of waste gas can be controlled by the variable frequency fan 92 and a fan inlet regulating valve 93, and a waste gas switch valve 91 is arranged between the waste gas main pipe 94 and the mixed gas main pipe 71; the amount of exhaust gas fed into each gas regenerator 21 may be controlled by a regulating valve of the existing mixed gas feeding unit 7.
A plurality of expansion joints are provided on the exhaust main pipe 94, and an insulating layer may be provided as required.
The exhaust gas main pipe 94 may be directly connected to the exhaust gas shutter 6 without passing through the mixed gas supply unit 7, and may supply the exhaust gas to the coke oven gas regenerator 21. However, the scheme can lead to corresponding pipelines, regulating valves and other equipment, and equipment investment is increased. After the waste gas main pipe 94 is directly connected with the waste gas shutter 6, when the coke oven is heated by adopting mixed gas, the coke oven gas supply unit 8 is closed, the waste gas supply unit 9 is closed, the mixed gas supply unit 7 is opened, the mixed gas enters the gas heat storage chamber 21 through the waste gas shutter 6, air enters the air heat storage chamber 22 through the air door 61 of the waste gas shutter 6, and the two gases respectively enter the bottom and the middle upper part of the vertical flue to be combusted and heated; when the coke oven is heated by coke oven gas, the coke oven gas feeding unit 8 is opened, the gas feeding of the mixed gas feeding unit 7 is cut off, the waste gas feeding unit 9 is opened, air enters the air heat accumulation chamber 22 through the air door of the waste gas shutter 6, and waste gas enters the gas heat accumulation chamber 21 through the waste gas feeding unit 9, and enters the vertical flame path of the combustion chamber 4 after being preheated by the gas heat accumulation chamber 21 so as to reduce the feeding amount of air at the bottom of the vertical flame path, so that the bottom of the vertical flame path is burnt in oxygen-deficient mode, and the generation of nitrogen oxides is reduced; meanwhile, the supply of the waste gas can reduce the concentration of combustion gas, prolong the height of flame, reduce the temperature of a high-temperature point of the flame, further reduce the generation of nitrogen oxides and improve the uniformity of vertical flue high-direction heating.
The reheating coke oven system provided by the invention is suitable for coke ovens of all models in the coking industry without changing the internal structure of the existing coke oven, and the heating system is designed according to a mixed gas heating mode. When the coke oven gas is used for heating, the mixed gas feeding unit 7 is closed, and the waste gas feeding unit 9 is opened, so that the production operation of a coke oven exchange system and the like is consistent with the production operation of the mixed gas. The invention is not only suitable for newly built coke ovens, but also suitable for the reconstruction of the existing coke ovens, has simple process flow, saves investment and has very high popularization value. The invention is also suitable for the single-heat type coke oven which is heated only by adopting coke oven gas.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
[ examples ] A
As shown in fig. 1 and 2, in the present embodiment, the reheating coke oven system includes a mixed gas supply unit 7, a coke oven gas supply unit 8, an exhaust gas shutter 6, a coke oven body, and an exhaust gas supply unit 9, and the reheating coke oven can be heated by both lean gas and rich gas; the coke oven body comprises a small flue 1, a regenerator 2, a chute 3, a combustion chamber 4 and an oven top 5.
The waste gas supply unit 9 is composed of a waste gas main pipe 94, a variable frequency fan 92, a waste gas switch valve 91, a fan regulating valve 93 and other devices, one end of the waste gas main pipe 9 is connected with an air intake on the coke oven branch flue 10, the other end is connected with a mixed gas main pipe 71 in the mixed gas supply unit 7, and the original mixed gas supply unit 7 and an exchange transmission device are used for supplying waste gas into the coke oven.
When the coke oven is heated by coke oven gas, the mixed gas switch valve 75 is closed, the waste gas switch valve 91 is opened, and waste gas enters the ascending gas regenerator through the mixed gas main pipe 71, the regulating cock 72, the exchange cock A73 corresponding to the ascending gas regenerator, and the waste gas shutter 6. When the coke oven heating system is switched, the switching transmission device is switched by the switching of the switching cock A73 and the switching cock B74, so that the waste gas enters the ascending gas heat accumulator after the switching through the switching cock B74. The waste gas feeding unit 9 is connected with the original mixed gas unit 7, and the devices such as pipelines, cocks, exchange transmission devices and the like are shared, so that the corresponding device investment can be greatly reduced.
The total supply amount of the waste gas can be controlled by a variable frequency fan 92 and a fan inlet regulating valve 93, and a waste gas switch valve 91 is arranged at one end of a waste gas main pipe 94 close to the mixed gas main pipe 71 and is used for rapidly cutting off the connection between the waste gas supply unit 9 and the mixed gas supply unit 7; the amount of exhaust gas fed to each gas regenerator 21 may be controlled by a regulating cock 72 in the existing mixed gas feed unit 7. When the coke oven gas is used for heating, the supply amount of the waste gas is related to the temperature of the regenerator 2 and the generation amount of nitrogen oxides in the vertical flue, the supply amount of the waste gas is increased, the generation of nitrogen oxides can be reduced to a certain degree, and the high-direction heating uniformity of the vertical flue can be improved. However, too much exhaust gas feed will result in the gas regenerator 21 being cooler than the air regenerator 22, and therefore, a suitable exhaust gas feed must be maintained so that the temperatures of the air regenerator 22 and the gas regenerator 21 are close.
In this embodiment, the exhaust main pipe 94 and the mixed gas main pipe 71 are both provided with a plurality of expansion joints, and an insulating layer is provided outside the exhaust main pipe 94. Because the temperature of waste gas is higher (about 200 ℃), the expansion joint can prevent that the pipeline from being heated and expanded and take place the deformation, sets up the purpose of heat preservation and prevents that basement ambient temperature is too high.
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.
Claims (7)
1. A kind of compound heat type coke oven system, including mixed gas supply unit, coke oven gas supply unit, waste gas shutter and coke oven body, wherein the coke oven body includes small flue, regenerator, chute, combustion chamber, charring chamber and furnace roof; the system is characterized by also comprising a waste gas feeding unit; the waste gas supply unit consists of a waste gas main pipe, a variable frequency fan, a fan inlet regulating valve and a waste gas switch valve; one end of the waste gas main pipe is connected with the smoke distributing channel of the coke oven, the other end of the waste gas main pipe is connected with the mixed gas main pipe in the mixed gas supply unit, or the other end of the waste gas main pipe is directly connected with the waste gas shutter; the waste gas main pipe is sequentially provided with a fan inlet regulating valve, a variable frequency fan and a waste gas switch valve along the flow direction of waste gas.
2. The coke oven system of claim 1, wherein the mixed gas main is provided with a mixed gas on-off valve upstream of the inlet point of the exhaust gas main.
3. The reheat coke oven system of claim 1, wherein the main mixed gas pipe is connected to the corresponding gas regenerator through a plurality of gas branch pipes, and the gas branch pipes are provided with adjusting cocks and exchange cocks.
4. The coke oven system of claim 1, wherein the main flue gas duct is provided with a plurality of expansion joints.
5. The coke oven system of claim 1, wherein the flue gas main pipe is externally provided with an insulating layer.
6. The coke oven system of claim 1, wherein the coke oven body is of a multi-stage air and gas heating structure.
7. The waste gas back-mixing method of the recuperative coke oven system of any one of claims 1 to 6, wherein when the coke oven is heated by using mixed gas, the waste gas on-off valve on the waste gas main pipe is closed, and the waste gas feeding unit does not participate in the coke oven production process; when the coke oven is heated by adopting coke oven gas, the mixed gas switch valve is closed, and the supply of the mixed gas is cut off; the waste gas switch valve on the waste gas main pipe is opened, air enters the air heat accumulation chamber through the waste gas switch, waste gas in the coke oven sub-flue enters the coal gas heat accumulation chamber through the waste gas main pipe, and enters the combustion chamber vertical flue after being preheated by the coal gas heat accumulation chamber.
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| CN202211649485.8A CN115806828A (en) | 2022-12-21 | 2022-12-21 | Reheating coke oven system and waste gas return method thereof |
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| CN202211649485.8A CN115806828A (en) | 2022-12-21 | 2022-12-21 | Reheating coke oven system and waste gas return method thereof |
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