Power generation system for recycling by-product coal gas of steel plant

Abstract

The invention discloses a steel plant byproduct gas recycling power generation system which comprises a discharge pipe, a check valve, a containing box, a first dust remover, a first conveying fan, a first desulfurization tower, a first denitration tower, a second detection box, a fourth conveying fan, a second desulfurization tower, a second denitration tower, a third conveying fan and a gas cabinet. And the other end of the discharge pipe communicates with an inner cavity of the containing box. The invention relates to the technical field of by-product gas power generation systems. According to the steel plant byproduct gas recycling power generation system, waste heat carried by byproduct gas is recycled through the containing box, impurities in the byproduct gas are filtered through the first dust remover, and the filtered byproduct gas can enter the first desulfurization tower and the first denitration tower to be subjected to desulfurization and denitration treatment, so that emission of atmospheric pollutants is reduced, the air quality is improved, and the energy consumption is reduced. And through desulfurization and denitrification treatment, corrosive substances in coal gas are reduced, power generation equipment is protected, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of by-product gas power generation systems, and particularly to a power generation system for recycling by-product gas in a steel mill. Background Art

[0002] The by-product gas in a steel mill refers to the combustible gas generated during the steelmaking and related production processes, mainly including coke oven gas, blast furnace gas, and converter gas. These gases have their own characteristics, with different calorific values and compositions, but all have important application values. Coke oven gas has a relatively high calorific value and is mainly composed of H2 and CH4. It can be used for heating and heat preservation in sintering, coking, blast furnace, steelmaking, and hot rolling processes, and can also be used as fuel for civil or industrial use.

[0003] The by-product gas contains sulfur and nitrogen elements, and will produce atmospheric pollutants such as sulfur dioxide and nitrogen oxides when burned. These pollutants will damage the environment and ecological system, and the pollutants will also corrode the power generation equipment, reduce the equipment performance and service life, increase the maintenance and replacement costs, resulting in a decrease in power generation efficiency and an increase in operating costs. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a power generation system for recycling by-product gas in a steel mill, which solves the problems mentioned above.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A power generation system for recycling by-product gas in a steel mill, including an exhaust pipe, a check valve, a receiving box, a first dust collector, a first delivery fan, a first desulfurization tower, a first denitration tower, a second detection box, a fourth delivery fan, a second desulfurization tower, a second denitration tower, a third delivery fan, and a gas holder. The other end of the exhaust pipe is communicated with the inner cavity of the receiving box. The surface of the receiving box is communicated with a first connecting pipe. The other end of the first connecting pipe is communicated with the air inlet of the first dust collector. The air outlet of the first connecting pipe is communicated with a second connecting pipe. The other end of the second connecting pipe is communicated with the air inlet of the first delivery fan. The air outlet of the first delivery fan is communicated with the lower part of the inner cavity of the first desulfurization tower through a third connecting pipe;

[0006] The top of the first desulfurization tower is communicated with a third guiding pipe. The other end of the third guiding pipe is communicated with the lower part of the inner cavity of the first denitration tower. The top of the first denitration tower is communicated with a fourth guiding pipe. The other end of the fourth guiding pipe is communicated with the inner cavity of the second detection box. The second detection box is provided with a sulfur dioxide sensor and a nitrogen oxide sensor;

[0007] The air inlet of the third delivery fan is communicated with the inner cavity of the second detection box through a first fixed pipe, the air outlet of the third delivery fan is communicated with the inner cavity of the gas holder through a second fixed pipe, the air inlet of the fourth delivery fan is communicated with the inner cavity of the second detection box through a third fixed pipe, the air outlet of the fourth delivery fan is communicated with the lower part of the inner cavity of the second desulfurization tower through a fourth fixed pipe, the top of the inner cavity of the second desulfurization tower is communicated with the lower part of the inner cavity of the second denitration tower through a first delivery pipe, the top of the second denitration tower is communicated with a second delivery pipe, the other end of the second delivery pipe is communicated with the second fixed pipe, a second solenoid valve is arranged on the second communication pipe, and third solenoid valves are arranged on both the first fixed pipe and the third fixed pipe.

[0008] Further, it further includes a second delivery fan, a first detection box and a second dust collector. The first detection box is arranged on the second communication pipe, a dust sensor is arranged on the first detection box, the second solenoid valve is located at the other end of the second communication pipe, the air inlet of the second delivery fan is communicated with the inner cavity of the first detection box through a fourth communication pipe, a first solenoid valve is arranged on the fourth communication pipe, the air outlet of the second delivery fan is communicated with a first guiding pipe, the other end of the first guiding pipe is communicated with the air inlet of the second dust collector, and the air outlet of the second dust collector is communicated with a second guiding pipe, and the other end of the second guiding pipe is communicated with the third communication pipe.

[0009] Further, it further includes a steam turbine and a generator. The output end of the steam turbine is communicated with the input end of the generator. A third delivery pipe is communicated with the surface of the gas holder, and the other end of the third delivery pipe is communicated with the steam turbine. A fourth delivery pipe is communicated with the surface of the gas holder.

[0010] Further, a serpentine pipe is fixedly connected inside the accommodating box, and both ends of the serpentine pipe extend to the outside of the accommodating box and are provided with flange plates.

[0011] Further, a motor is fixedly connected to the surface of the second detection box, a rotating rod is fixedly connected to the output shaft of the motor, the inner end of the rotating rod rotates and extends into the second detection box, and a plurality of flow deflectors are fixedly connected thereto.

[0012] Further, a plurality of flow disturbing vanes are fixedly connected inside the first detection box, and the plurality of flow disturbing vanes are evenly spaced and arranged along the inside of the first detection box.

[0013] Further, a check valve is arranged on the discharge pipe.

[0014] Further, the plurality of flow deflectors are evenly spaced and arranged annularly along the surface of the rotating rod, and a housing is fixedly connected to the surface of the motor.

[0015] Furthermore, a plurality of maintenance covers are detachably arranged on the surface of the second detection box, and an observation window is arranged on the surface of the maintenance cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the by-product gas discharged is injected into the inner cavity of the accommodation box through the discharge pipe, the accommodation box recovers the waste heat carried by the by-product gas, the first dust collector filters the impurities in the by-product gas, and the filtered by-product gas can enter the first desulfurization tower and the first denitration tower for desulfurization and denitration treatment, reducing the emission of air pollutants, improving air quality, and protecting the ecological environment. The desulfurization and denitration treatment reduces the corrosive substances in the gas, protects the power generation equipment, extends the service life of the equipment, reduces the maintenance and replacement costs, and the clean gas burns more fully, which helps to improve the operation efficiency and energy utilization efficiency of the power generation equipment, increase the power generation, and through the second detection box provided, it is convenient to detect the gas after preliminary treatment. When the desulfurization and denitration quality of the gas after preliminary treatment is unqualified, the gas can be subjected to secondary desulfurization and denitration treatment through the second desulfurization tower and the second denitration tower, improving and ensuring the quality of the gas, which is beneficial to the power generation work using the by-product gas recovered by the steel mill. Description of the Drawings

[0017] Figure 1 It is a system diagram of the by-product gas recovery and utilization power generation system of the steel mill of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the gas holder and the third conveying fan of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the accommodation box and the serpentine tube of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the first detection box and the spoiler of the present invention;

[0021] Figure 5 It is a structural schematic diagram of the second detection box and the flow deflector of the present invention.

[0022] In the figure: 1, discharge pipe; 2, check valve; 3, accommodation tank; 4, first connecting pipe; 5, first dust collector; 6, second connecting pipe; 7, first detection box; 8, dust sensor; 9, spoiler; 10, first solenoid valve; 11, second solenoid valve; 12, first conveying fan; 13, third connecting pipe; 14, second conveying fan; 15, fourth connecting pipe; 16, first guiding pipe; 17, second dust collector; 18, second guiding pipe; 19, first desulfurization tower; 20, first denitration tower; 21, third guiding pipe; 22, fourth guiding pipe; 23, second detection box; 24, drive motor; 25, rotating rod; 26, sulfur dioxide sensor; 27, nitrogen oxide sensor; 28, flow deflector; 29, first fixing pipe; 30, third solenoid valve; 31, third conveying fan; 32, second fixing pipe; 33, gas holder; 34, fourth conveying fan; 35, third fixing pipe; 36, fourth fixing pipe; 37, second desulfurization tower; 38, first conveying pipe; 39, second denitration tower; 40, second conveying pipe; 41, third conveying pipe; 42, steam turbine; 43, generator; 44, fourth conveying pipe; 45, serpentine pipe. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1-5 , the present invention provides a technical solution: a power generation system for recycling by - product gas in a steel mill, including a discharge pipe 1, a check valve 2, an accommodation tank 3, a first dust collector 5, a first conveying fan 12, a first desulfurization tower 19, a first denitration tower 20, a second detection box 23, a fourth conveying fan 34, a second desulfurization tower 37, a second denitration tower 39, a third conveying fan 31 and a gas holder 33. The other end of the discharge pipe 1 is communicated with the inner cavity of the accommodation tank 3. A first connecting pipe 4 is communicated with the surface of the accommodation tank 3. The other end of the first connecting pipe 4 is communicated with the air inlet of the first dust collector 5. A check valve 2 is arranged on the discharge pipe 1.

[0025] The air outlet of the first connecting pipe 4 is communicated with a second connecting pipe 6. The other end of the second connecting pipe 6 is communicated with the air inlet of the first conveying fan 12. The air outlet of the first conveying fan 12 is communicated with the lower part of the inner cavity of the first desulfurization tower 19 through a third connecting pipe 13.

[0026] The top of the first desulfurization tower 19 is connected to a third guiding pipe 21, and the other end of the third guiding pipe 21 is connected to the lower part of the inner cavity of the first denitration tower 20. The top of the first denitration tower 20 is connected to a fourth guiding pipe 22, and the other end of the fourth guiding pipe 22 is connected to the inner cavity of the second detection box 23. A sulfur dioxide sensor 26 and a nitrogen oxide sensor 27 are arranged on the second detection box 23;

[0027] The air inlet of the third delivery fan 31 is connected to the inner cavity of the second detection box 23 through a first fixed pipe 29, and the air outlet of the third delivery fan 31 is connected to the inner cavity of the gas holder 33 through a second fixed pipe 32. The air inlet of the fourth delivery fan 34 is connected to the inner cavity of the second detection box 23 through a third fixed pipe 35, and the air outlet of the fourth delivery fan 34 is connected to the lower part of the inner cavity of the second desulfurization tower 37 through a fourth fixed pipe 36.

[0028] The top of the inner cavity of the second desulfurization tower 37 is connected to the lower part of the inner cavity of the second denitration tower 39 through a first delivery pipe 38. The top of the second denitration tower 39 is connected to a second delivery pipe 40, and the other end of the second delivery pipe 40 is connected to the second fixed pipe 32. A second solenoid valve 11 is arranged on the second connecting pipe 6, and third solenoid valves 30 are arranged on both the first fixed pipe 29 and the third fixed pipe 35.

[0029] The discharge pipe 1 injects the discharged by-product gas into the inner cavity of the accommodation tank 3. The accommodation tank 3 recovers the waste heat carried by the by-product gas, and the first dust collector 5 filters the impurities in the by-product gas. The filtered by-product gas can then enter the first desulfurization tower 19 and the first denitration tower 20 for desulfurization and denitration treatment, reducing the emission of air pollutants, improving air quality, and protecting the ecological environment.

[0030] The desulfurization and denitration treatment reduces the corrosive substances in the gas, protects the power generation equipment, extends the service life of the equipment, reduces the maintenance and replacement costs, and the clean gas burns more fully, which helps to improve the operation efficiency and energy utilization efficiency of the power generation equipment and increase the power generation.

[0031] The second detection box 23 can detect the gas after preliminary treatment. When the desulfurization and denitration quality of the gas after preliminary treatment is unqualified, the gas can be subjected to secondary desulfurization and denitration treatment through the second desulfurization tower 37 and the second denitration tower 39 to improve and ensure the quality of the gas, which is beneficial to the power generation work using the by-product gas recovered by the steel mill.

[0032] It also includes a second delivery fan 14, a first detection box 7 and a second dust collector 17. The first detection box 7 is arranged on the second connecting pipe 6. A dust sensor 8 is arranged on the first detection box 7. The second solenoid valve 11 is located at the other end of the second connecting pipe 6. The air inlet of the second delivery fan 14 is connected to the inner cavity of the first detection box 7 through a fourth connecting pipe 15, and a first solenoid valve 10 is arranged on the fourth connecting pipe 15.

[0033] The air outlet of the second delivery fan 14 is communicated with a first guiding pipe 16, the other end of the first guiding pipe 16 is communicated with the air inlet of a second dust remover 17, the air outlet of the second dust remover 17 is communicated with a second guiding pipe 18, and the other end of the second guiding pipe 18 is communicated with a third communicating pipe 13.

[0034] The second communicating pipe 6 conveys the by-product gas after preliminary impurity removal into the inner cavity of the first detection box 7, and the dust sensor 8 detects the impurity content in the by-product gas. When the impurity content is qualified, it is conveyed through the third communicating pipe 13 into the inner cavity of the first desulfurization tower 19 for subsequent treatment.

[0035] When the quality is unqualified, the second solenoid valve 11 is closed and the first solenoid valve 10 is opened. After the second delivery fan 14 works, the unqualified by-product gas inside the first detection box 7 can be conveyed into the inner cavity of the second dust remover 17 for secondary impurity removal. The impurity removal effect is good, the quality of the by-product gas is improved, and the subsequent desulfurization and denitrification effects are further improved.

[0036] It further includes a steam turbine 42 and a generator 43. The output end of the steam turbine 42 is communicated with the input end of the generator 43. The surface of the gas holder 33 is communicated with a third delivery pipe 41, the other end of the third delivery pipe 41 is communicated with the steam turbine 42, and the surface of the gas holder 33 is communicated with a fourth delivery pipe 44. The other end of the fourth delivery pipe 44 can be communicated with a combustion furnace for re-combustion use.

[0037] A serpentine pipe 45 is fixedly connected inside the accommodating box 3. Both ends of the serpentine pipe 45 extend to the outside of the accommodating box 3 and are provided with flange plates.

[0038] After circulating water flow is injected into the serpentine pipe 45, the heat of the by-product gas carrying heat in the inner cavity of the accommodating box 3 can be recovered.

[0039] A driving motor 24 is fixedly connected to the surface of the second detection box 23. The output shaft of the driving motor 24 is fixedly connected with a rotating rod 25. The inner end of the rotating rod 25 rotatably extends into the second detection box 23 and is fixedly connected with a plurality of flow deflecting plates 28.

[0040] After the driving motor 24 drives the rotating rod 25 to rotate, a plurality of flow deflecting plates 28 can be driven to rotate, thereby disturbing the flow of the by-product gas inside the second detection box 23 and improving the detection accuracy of the sulfur dioxide sensor 26 and the nitrogen oxide sensor 27 for the by-product gas.

[0041] A plurality of flow disturbing pieces 9 are fixedly connected inside the first detection box 7, and the plurality of flow disturbing pieces 9 are uniformly and spacedly arranged along the inside of the first detection box 7.

[0042] A plurality of flow deflectors 28 are evenly distributed in a ring along the surface of the rotating rod 25, and a housing is fixedly connected to the surface of the driving motor 24.

[0043] A number of maintenance covers are detachably arranged on the surface of the second detection box 23, and an observation window is arranged on the surface of the maintenance cover.

[0044] During operation, the discharge pipe 1 injects the discharged by-product gas into the inner cavity of the accommodation tank 3. The accommodation tank 3 recovers the waste heat carried by the by-product gas. The first dust collector 5 then filters the impurities in the by-product gas. The filtered by-product gas can then enter the first desulfurization tower 19 and the first denitration tower 20 for desulfurization and denitration treatment, reducing the emission of air pollutants, improving air quality, protecting the ecological environment. The desulfurization and denitration treatment reduces the corrosive substances in the gas, protects the power generation equipment, extends the service life of the equipment, reduces the maintenance and replacement costs. Moreover, the clean gas burns more fully, which helps to improve the operation efficiency and energy utilization efficiency of the power generation equipment, increase the power generation, and through the arranged second detection box 23, it is convenient to detect the gas after preliminary treatment. When the desulfurization and denitration quality of the gas after preliminary treatment is unqualified, the gas can be subjected to secondary desulfurization and denitration treatment through the second desulfurization tower 37 and the second denitration tower 39, improving and ensuring the quality of the gas, which is beneficial to the power generation work using the by-product gas recovered by the steel mill.

[0045] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A power generation system for recovering by-product gas from a steel mill, comprising a discharge pipe (1), a check valve (2), a containing box (3), a first dust collector (5), a first conveying fan (12), a first desulfurization tower (19), a first denitrification tower (20), a second detection box (23), a fourth conveying fan (34), a second desulfurization tower (37), a second denitrification tower (39), a third conveying fan (31) and a gas cabinet (33), characterized in that: The other end of the discharge pipe (1) is connected to the inner cavity of the containing box (3), the surface of the containing box (3) is connected to a first connecting pipe (4), the other end of the first connecting pipe (4) is connected to the air inlet of the first dust collector (5), the air outlet of the first connecting pipe (4) is connected to a second connecting pipe (6), the other end of the second connecting pipe (6) is connected to the air inlet of the first conveying fan (12), and the air outlet of the first conveying fan (12) is connected to the lower part of the inner cavity of the first desulfurization tower (19) through a third connecting pipe (13); The top of the first desulfurization tower (19) is connected to a third guide pipe (21), the other end of which is connected to the lower part of the inner cavity of the first denitration tower (20); the top of the first denitration tower (20) is connected to a fourth guide pipe (22), the other end of which is connected to the inner cavity of the second detection box (23); the second detection box (23) is provided with a sulfur dioxide sensor (26) and a nitrogen oxide sensor (27); The air inlet of the third conveying fan (31) is communicated with the inner cavity of the second detection box (23) through the first fixed pipe (29), the air outlet of the third conveying fan (31) is communicated with the inner cavity of the gas cabinet (33) through the second fixed pipe (32), the air inlet of the fourth conveying fan (34) is communicated with the inner cavity of the second detection box (23) through the third fixed pipe (35), and the air outlet of the fourth conveying fan (34) is communicated with the inner cavity of the second desulfurization tower (37) through the fourth fixed pipe (36). The top of the inner cavity of the second desulfurization tower (37) is connected to the lower part of the inner cavity of the second denitrification tower (39) through the first delivery pipe (38), the top of the second denitrification tower (39) is connected to the second delivery pipe (40), the other end of the second delivery pipe (40) is connected to the second fixed pipe (32), the second connecting pipe (6) is provided with a second solenoid valve (11), and the first fixed pipe (29) and the third fixed pipe (35) are both provided with a third solenoid valve (30).

2. A power generation system for recovering by-product gas from a steelmaking plant according to claim 1, characterized in that: The air filter further comprises a second conveying fan (14), a first detection box (7) and a second dust collector (17); the first detection box (7) is arranged on the second connecting pipe (6); a dust sensor (8) is arranged on the first detection box (7); the second solenoid valve (11) is located at the other end of the second connecting pipe (6); the air inlet of the second conveying fan (14) is connected to the inner cavity of the first detection box (7) through a fourth connecting pipe (15); the fourth connecting pipe (15) is provided with a first solenoid valve (10); the air outlet of the second conveying fan (14) is connected to the first guide pipe (16); the other end of the first guide pipe (16) is connected to the air inlet of the second dust collector (17); the air outlet of the second dust collector (17) is connected to the second guide pipe (18); the other end of the second guide pipe (18) is connected to the third connecting pipe (13).

3. The power generation system for recovering by-product gas from a steelmaking plant according to claim 1 is characterized in that: It also includes a steam turbine (42) and a generator (43), wherein the output end of the steam turbine (42) is connected to the input end of the generator (43), the surface of the gas tank (33) is connected to a third delivery pipe (41), the other end of the third delivery pipe (41) is connected to the steam turbine (42), and the surface of the gas tank (33) is connected to a fourth delivery pipe (44).

4. The power generation system for recovering by-product gas from a steelmaking plant according to claim 1, characterized in that: A serpentine tube (45) is fixedly connected to the interior of the containing box (3), and both ends of the serpentine tube (45) extend to the outside of the containing box (3) and are provided with flanges.

5. The power generation system for recovering by-product gas from a steelmaking plant according to claim 1 is characterized by: A motor (24) is fixedly connected to the surface of the second detection box (23); an output shaft of the motor (24) is fixedly connected to a rotating rod (25); an inner end of the rotating rod (25) rotates and extends to the interior of the second detection box (23) and is fixedly connected to a plurality of flow bypass plates (28).

6. The power generation system for recovering by-product gas from a steelmaking plant according to claim 2, characterized in that: A plurality of spoilers (9) are fixedly connected to the interior of the first detection box (7), and the plurality of spoilers (9) are evenly spaced and arranged along the interior of the first detection box (7).

7. The power generation system for recovering by-product gas from a steelmaking plant according to claim 1, characterized in that: The discharge pipe (1) is provided with a check valve (2).

8. The power generation system for recovering by-product gas from a steelmaking plant according to claim 5, characterized in that: A plurality of flow-circling plates (28) are evenly spaced and distributed in a ring shape along the surface of the rotating rod (25), and a shell is fixedly connected to the surface of the motor (24).

9. The power generation system for recovering by-product gas from a steelmaking plant according to claim 5, characterized in that: The surface of the second detection box (23) is provided with a plurality of detachable inspection covers, and the surface of the inspection covers is provided with an observation window.

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