A main plant for blast furnace gas waste heat power generation

Abstract

The present invention relates to a main plant for blast furnace gas waste heat power generation, including a steam engine room, a deaerator room and a boiler room, wherein the steam engine room and the deaerator room are adjacently arranged on the side of the boiler room, the steam engine room and the deaerator room are connected, the steam engine room includes a first part away from the deaerator room and a second part close to the deaerator room, the first part includes a steam turbine and a condenser connected to the steam turbine, the second part includes a condensate polishing device and a heater platform arranged in sequence from the end away from the boiler room to the end close to the boiler room, the heater platform is arranged at a distance of 4 to 6 meters from the horizontal plane, and a shaft seal heater, a low-pressure heater and a high-pressure heater are arranged on the heater platform; the deaerator room includes an electric feed water pump arranged on the horizontal plane, and a deaerator and a blowdown expansion tank are arranged in the deaerator room at a distance of 12 to 14 meters from the horizontal plane. The boiler room, the steam engine room and the deaerator room of the present invention and the distribution between the devices are compact and the layout is reasonable, which is suitable for high-parameter small units for blast furnace gas waste heat power generation in the steel industry.

Description

Technical Field

[0001] The present application relates to the technical field of gas-fired power generation, and in particular to a main plant for power generation using waste heat from blast furnace gas. Background Art

[0002] Blast furnace gas, converter gas and coke oven gas are produced during the steel smelting process, of which blast furnace gas accounts for the largest proportion. The main components of blast furnace gas are CO, CO2, H2, N2, etc. It is an important secondary energy source. The effective use of blast furnace gas can reduce the energy consumption and power generation costs of enterprises, provide additional benefits for enterprises, further optimize the resource allocation of steel enterprises, and increase the market competitiveness of enterprises.

[0003] At present, the main way to utilize the waste heat of blast furnace gas is to use gas boilers to burn the generated steam, which enters the steam turbine to generate power. The parameters of such units are generally ultra-high temperature and ultra-high pressure with one reheat or ultra-high temperature subcritical with one reheat, and the unit scale is generally 30 to 100MW.

[0004] This type of steam turbine is a small steam turbine in terms of unit capacity and a medium-sized steam turbine in terms of unit parameters, so the main plant layout has the characteristics of both small and medium-sized units. However, the design of the existing blast furnace gas waste heat power generation main plant is not reasonable and occupies a large space. Summary of the invention

[0005] The present application provides a blast furnace gas waste heat power generation main plant to solve the problem of how to design a blast furnace gas waste heat power generation main plant more reasonably.

[0006] The technical solutions adopted in this application are as follows:

[0007] The present invention provides a main plant for blast furnace gas waste heat power generation, comprising a steam engine room, a deaerator room and a boiler room, wherein the steam engine room and the deaerator room are adjacently arranged on the side of the boiler room, and the steam engine room and the deaerator room are connected, the steam engine room comprises a first part away from the deaerator room and a second part close to the deaerator room, the first part comprises a steam turbine and a condenser connected to the steam turbine, the second part comprises a condensate polishing device and a heater platform arranged in sequence from the end away from the boiler room to the end close to the boiler room, the heater platform is arranged at a distance of 4 to 6 m from the horizontal plane, and a shaft seal heater, at least one low-pressure heater and at least one high-pressure heater are arranged on the heater platform; the deaerator room comprises an electric feed water pump arranged on the horizontal plane, and a deaerator and a sewage expansion tank are arranged in the deaerator room at a distance of 12 to 14 m from the horizontal plane.

[0008] Furthermore, the steam engine room and the deaerator room are arranged in parallel on the side of the boiler room, and the head of the steam turbine faces the boiler room.

[0009] Furthermore, the first part also includes a maintenance site and an outlet chamber arranged on a side of the steam turbine away from the boiler room, the outlet chamber is close to the second part, and the maintenance site is located on a side of the outlet chamber away from the second part.

[0010] Furthermore, the first part also includes a circulating water pipe pit and a condenser pit, wherein the circulating water pipe pit is arranged between the maintenance site and the steam turbine and is used to set the circulating water pipeline of the condenser, and the condenser pit is arranged between the outlet chamber and the steam turbine and is used to set the condenser; the second part also includes a condensate pump pit, which is located between the condensate polishing device and the heater platform and is used to set the condensate pump.

[0011] Furthermore, the deaerator room includes a third part away from the boiler room, the third part is an electrical distribution room and the electrical distribution room is connected to the steam engine room.

[0012] Furthermore, the deaerator room also includes a fourth part close to the boiler room, the electric feed water pump is arranged on the horizontal plane of the fourth part, the electric feed water pump maintenance space is arranged 4 to 6 meters away from the horizontal plane in the fourth part, the battery room, control room and electronic equipment room are arranged 8 to 10 meters away from the horizontal plane in the fourth part, and the deaerator and the sewage expansion tank are arranged 12 to 14 meters away from the horizontal plane in the fourth part.

[0013] Furthermore, a first staircase is provided on the opposite side of the steam turbine room away from the deaerator room, and the top of the first staircase is connected to the steam turbine room and close to the upper part of the steam turbine; a second staircase is provided between the third part and the fourth part, and the second staircase can lead to 4-6m, 8-10m and 12-14m of the fourth part.

[0014] Furthermore, a first inlet and outlet is provided on the opposite side of the steam turbine room away from the deaerator room, and the first inlet and outlet is connected to the maintenance site; there is at least one second inlet and outlet between the second part of the steam turbine room and the electrical distribution room of the deaerator room; and the deaerator room has at least one third inlet and outlet on the opposite side of the steam turbine room away from the steam turbine room, and the third inlet and outlet is connected to the fourth part.

[0015] Furthermore, it also includes a main oil tank, an oil cooler and a duplex oil filter which are located in the first part and are respectively connected to the steam turbine.

[0016] Furthermore, the roof of the steam engine room has a crane beam, and a crane is arranged on the crane beam.

[0017] The beneficial effects of adopting the technical solution of this application are as follows:

[0018] The main power plant of blast furnace gas waste heat power generation of the present invention has a compact distribution of boiler room, steam engine room and deaerator room as well as various devices, and a reasonable layout. At the same time, the present invention:

[0019] (1) Small units with high parameters suitable for power generation from waste heat of blast furnace gas in the steel industry.

[0020] (2) The steam engine room and deaerator room occupy a small area.

[0021] (3) The low-pressure water supply pipeline (the connecting pipeline between the deaerator and the electric water supply pump) is shorter, so the pressure drop is smaller.

[0022] (4) The four major pipelines (the connecting pipelines between the boiler and the steam turbine: the main steam, reheat hot section and reheat cold section pipelines; the connecting pipelines between the high-pressure heater and the boiler room: the high-pressure feed water pipeline) are shorter, and the pressure drop and temperature drop are lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 The structural layout drawing of the main plant;

[0025] Figure 2 It is the layout drawing of the 0-meter layer (horizontal plane) of the turbine room and deaerator room;

[0026] Figure 3 This is the 5-meter layout of the turbine room and deaerator room;

[0027] Figure 4 This is the cross-sectional layout of the steam engine room and deaerator room.

[0028] Illustration Description:

[0029] Among them, 1-steam engine room; 11-first part; 12-second part; 13-first staircase; 14-first entrance and exit; 15-crane beam; 16-crane;

[0030] 111-steam turbine; 112-condenser; 113-circulating water pipe pit; 114-condenser pit; 115-outlet room; 116-maintenance site; 117-main oil tank; 118-oil cooler; 119-dual oil filter;

[0031] 121-condensate polishing device; 122-high pressure heater; 123-shaft seal heater; 124-low pressure heater; 125-condensate pump pit; 126-condensate pump;

[0032] 2-Deaerator room: 21-third part; 22-fourth part; 23-second staircase; 24-second entrance and exit; 25-third entrance and exit;

[0033] 211-Electrical distribution room;

[0034] 221-electric water supply pump; 222-deaerator; 223-sewage expansion tank; 224-control room; 225-cable mezzanine; 226-maintenance monorail;

[0035] 3- Boiler room;

[0036] 4-channel. DETAILED DESCRIPTION

[0037] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0038] See also Figure 1 , which is a schematic diagram of the main plant structure of a blast furnace gas waste heat power generation main plant;

[0039] Figure 2 It is the layout drawing of the 0-meter layer (horizontal plane) of the turbine room and deaerator room; Figure 3 This is the 5-meter layout of the turbine room and deaerator room;

[0040] Figure 4 This is the cross-sectional layout of the steam engine room and deaerator room.

[0041] This application provides a blast furnace gas waste heat power generation main plant, such as Figure 1 As shown, it includes a steam turbine room 1, a deaerator room 2 and a boiler room 3. The steam turbine room 1 and the deaerator room 2 are adjacent to each other and are connected and arranged on the side of the boiler room 3. The steam turbine room 1 and the deaerator room 2 are arranged in parallel, and there is a passage 4 between the steam turbine room 1, the deaerator room 2 and the boiler room. The front of the boiler room 3 faces left, the rear of the furnace faces right, and the head of the steam turbine 111 faces the boiler room 3.

[0042] like Figure 2 to Figure 4 , specifically:

[0043] The steam engine room 1 includes a first part 11 far from the deaerator room 2 and a second part 12 near the deaerator room 2. The first part 11 includes a steam turbine 111 and a condenser 112 connected to the steam turbine 111. The second part 12 includes a condensate polishing device 121 and a heater platform arranged in sequence from the end far from the boiler room 3 to the end near the boiler room 3. The heater platform is arranged at a distance of 4 to 6 meters from the horizontal plane. A shaft seal heater 123, at least one low-pressure heater 124 and at least one high-pressure heater 122 are arranged on the heater platform. The deaerator room 2 includes an electric feed water pump 221 arranged on the horizontal plane. A deaerator 222 and a blowdown expansion tank 223 are arranged in the deaerator room 2 at a distance of 12 to 14 meters from the horizontal plane.

[0044] The boiler room 3 is connected to the steam turbine 111 through a pipeline, the steam turbine 111 is connected to the condenser 112, the condenser 112 is connected to the condensate pump 126, the condensate pump 126 is connected to the condensate polishing device 121, the condensate polishing device 121 is connected to the shaft seal heater 123, the shaft seal heater 123 is connected to the low-pressure heater 124, the low-pressure heater 124 is connected to the deaerator 222, the deaerator 222 is connected to the electric feed water pump 221, the electric feed water pump 221 is connected to the high-pressure heater 122, and the high-pressure heater 122 is connected to the boiler in the boiler room 3; the sewage expansion tank 223 is connected to the boiler in the boiler room 3.

[0045] The first part 11 also includes a maintenance site 116 and an outlet chamber 115 arranged on the side of the steam turbine 111 away from the boiler room 3. The outlet chamber 115 is close to the second part 12, and the maintenance site 116 is located on the side of the outlet chamber 115 away from the second part 12. The maintenance site 116 is used to facilitate the maintenance of the steam turbine 111 and other devices, and the outlet chamber 115 is used to set the outlet device of the generator equipped with the steam turbine 111.

[0046] The first part 11 also includes a circulating water pipe pit 113 and a condenser pit 114. The circulating water pipe pit 113 is arranged between the maintenance site 116 and the turbine 111 and is used to set up a circulating water pipeline connected to the condenser 112. The condenser 112 pit is arranged between the outlet chamber 115 and the turbine 111 and the condenser 112 pit is used to set up the condenser 112; the second part 12 also includes a condensate pump pit 125. The condensate pump pit 125 is located between the condensate polishing device 121 and the heater platform and is used to set up a condensate pump 126. The condensate pump 126 is connected between the condenser 112 and the condensate polishing device 121.

[0047] The deaerator room 2 includes a third part 21 far away from the boiler room 3 . The third part 21 is an electrical distribution room 211 , and the electrical distribution room 211 is connected to the steam engine room 1 .

[0048] The deaerator room 2 also includes a fourth part 22 near the boiler room 3, an electric feed water pump 221 is arranged on the horizontal plane of the fourth part 22, an electric feed water pump 221 maintenance space is arranged at a distance of 4 to 6 meters from the horizontal plane in the fourth part 22, a battery room, a control room 224 and an electronic equipment room are arranged at a distance of 8 to 10 meters from the horizontal plane in the fourth part 22, and a deaerator 222 and a sewage expansion tank 223 are arranged at a distance of 12 to 14 meters from the horizontal plane in the fourth part 22. Among them, in this embodiment, the fourth part 22 of the deaerator room 2 has three floors, the battery room, the control room 224 and the electronic equipment room are located on the second floor at a distance of 9 meters from the horizontal plane, the deaerator 222 and the sewage expansion tank 223 are located on the third floor at a distance of 13.4 meters from the horizontal plane, and the electric feed water pump 221 maintenance space is located at a distance of 5 meters from the horizontal plane. Figure 4 As shown, a cable interlayer 225 is provided at 7m of the fourth part 22 of the deaerator room 2, and a maintenance monorail 226 is provided below the cable interlayer 225. The position below the maintenance monorail 226 is a maintenance space for facilitating maintenance of the electric feedwater pump 221, etc. The batteries in the battery room are used to supply direct current to the steam turbine, and the centralized control room 224 is used to set the control unit of the steam turbine 111.

[0049] A first staircase 13 is provided on the opposite side of the steam turbine room 1 away from the deaerator room 2, and the top of the first staircase 13 is connected to the steam turbine room 1 and close to the upper part of the steam turbine 111; a second staircase 23 is provided between the third part 21 and the fourth part 22, and the second staircase 23 can lead to 4-6m, 8-10m and 12-14m of the fourth part 22.

[0050] A first inlet and outlet 14 is provided on the opposite side of the steam turbine room 1 away from the deaerator room 2, and the first inlet and outlet 14 is connected to the maintenance site 116; there is at least one second inlet and outlet 24 between the second part 12 of the steam turbine room 1 and the electrical distribution room 211 of the deaerator room 2; the deaerator room 2 has at least one third inlet and outlet 25 on the opposite side of the steam turbine room 1 away from the steam turbine room 1, and the third inlet and outlet 25 is connected to the fourth part 22.

[0051] It also includes a main oil tank 117, an oil cooler 116 and a duplex oil filter 119 which are located in the first part 11 and are respectively connected to the steam turbine 111. The main oil tank 117 is used to provide lubricating oil to the steam turbine 111, and the oil cooler 116 and the duplex oil filter 119 are used to purify and cool the lubricating oil of the steam turbine 111.

[0052] The roof of the steam engine room 1 has a crane beam 15, on which a crane 16 is arranged to facilitate adjustment and maintenance of the steam turbine 111, the condensate pump 126, the shaft seal heater 123, the high-pressure heater 122 and the low-pressure heater 124.

[0053] At least one side of the turbine room 1 is provided with a plurality of skylights, and the skylights are located on the side of the turbine room 1 opposite to the deaerator room 2 .

[0054] In this embodiment, the heater platform in the turbine room 1 is L-shaped, and the vertical arm of the heater platform is fixed to the wind-resistant column of the turbine 111, and the end of the horizontal arm is fixed to the B-row column of the deaerator room 2. Specifically, the horizontal arm of the heater platform is set at 5m from the horizontal plane. At the same time, a shaft seal heater 123, three low-pressure heaters 124 and three high-pressure heaters 122 are set on the horizontal arm of the heater platform.

[0055] The working process of each device in this embodiment is as follows:

[0056] Steam is generated in boiler room 3, and the steam enters steam turbine 111 through connecting pipes to generate electricity; after the steam has completed work in steam turbine 111, it enters condenser 112 and condenses into water, which is called condensate; the condensate is pressurized by condensate pump 126, enters condensate polishing device 121, and then enters deaerator 222 after being heated by shaft seal heater 123 and low-pressure heater 124 respectively; the water coming out of deaerator 222 is pressurized by electric feed water pump 221, enters high-pressure heater 122 for heating, and then enters boiler in boiler room 3 to be heated into steam;

[0057] After the boiler's sewage enters the continuous sewage expansion tank 223, the exhaust steam enters the deaerator 222 for recovery, and the drainage enters the fixed discharge expansion tank and then is discharged to the fixed discharge well.

[0058] The beneficial effects of this embodiment are:

[0059] (1) Small units with high parameters suitable for power generation from waste heat of blast furnace gas in the steel industry.

[0060] (2) The steam engine room 1 and the deaerator room 2 occupy a relatively small area.

[0061] (3) The low-pressure water supply pipeline (the connecting pipeline between the deaerator 222 and the electric water supply pump 221) is shorter, so the pressure drop is smaller.

[0062] (4) The distribution of each device is compact and the layout is reasonable, so the four major pipelines (the connecting pipelines between the boiler and the steam turbine 111: the main steam section, the reheat hot section and the reheat cold section pipelines; the connecting pipelines between the high-pressure heater 122 and the boiler room 3: the high-pressure feed water pipeline) are short, and the pressure drop and temperature drop are low. Among them, the main steam section refers to the pipeline between the boiler superheater outlet and the turbine high-pressure cylinder inlet, the reheat cold section refers to the pipeline between the turbine high-pressure cylinder exhaust and the boiler reheat inlet, and the reheat hot section refers to the pipeline between the boiler reheat outlet and the turbine medium and low pressure cylinder inlet.

[0063] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A main plant for blast furnace gas waste heat power generation, comprising a turbine room, a deaerator room and a boiler room, wherein the turbine room and the deaerator room are adjacently arranged on the side of the boiler room, and the turbine room and the deaerator room are connected, characterized in that: The steam engine room includes a first part away from the deaerator room and a second part close to the deaerator room, the first part includes a steam turbine and a condenser connected to the steam turbine, the second part includes a condensate polishing device and a heater platform arranged in sequence from the end away from the boiler room to the end close to the boiler room, the heater platform is arranged at a distance of 4 to 6 meters from the horizontal plane, and a shaft seal heater, at least one low-pressure heater and at least one high-pressure heater are arranged on the heater platform; The deaerator room includes an electric water supply pump arranged on a horizontal plane, and a deaerator and a sewage expansion tank are arranged in the deaerator room at a distance of 12 to 14 meters from the horizontal plane.

2. The blast furnace gas waste heat power generation main plant according to claim 1 is characterized by: The steam engine room and the deaerator room are arranged in parallel on the side of the boiler room, and the head of the steam turbine faces the boiler room.

3. The blast furnace gas waste heat power generation main plant according to claim 2 is characterized by: The first part also includes a maintenance site and a line outlet chamber arranged on a side of the steam turbine away from the boiler room, the line outlet chamber is close to the second part, and the maintenance site is located on a side of the line outlet chamber away from the second part.

4. The blast furnace gas waste heat power generation main plant according to claim 3 is characterized by: The first part also includes a circulating water pipe pit and a condenser pit. The circulating water pipe pit is arranged between the maintenance site and the steam turbine and is used to set the circulating water pipeline of the condenser. The condenser pit is arranged between the outlet chamber and the steam turbine and is used to set the condenser. The second part also includes a condensate pump pit, which is located between the condensate polishing device and the heater platform and is used to set the condensate pump.

5. The blast furnace gas waste heat power generation main plant according to claim 3 is characterized by: The deaerator room includes a third part away from the boiler room, the third part is an electrical distribution room and the electrical distribution room is connected to the steam engine room.

6. The blast furnace gas waste heat power generation main plant according to claim 5 is characterized by: The deaerator room also includes a fourth part close to the boiler room, the electric feed water pump is arranged on the horizontal plane of the fourth part, the electric feed water pump maintenance space is arranged 4 to 6 meters away from the horizontal plane in the fourth part, the battery room, control room and electronic equipment room are arranged 8 to 10 meters away from the horizontal plane in the fourth part, and the deaerator and the sewage expansion tank are arranged 12 to 14 meters away from the horizontal plane in the fourth part.

7. The blast furnace gas waste heat power generation main plant according to claim 6 is characterized by: A first staircase is arranged on the opposite side of the steam turbine room away from the deaerator room, and the top of the first staircase is connected to the steam turbine room and close to the upper part of the steam turbine; a second staircase is arranged between the third part and the fourth part, and the second staircase can lead to 4-6m, 8-10m and 12-14m of the fourth part.

8. The blast furnace gas waste heat power generation main plant according to claim 6 is characterized by: A first inlet and outlet is provided on the opposite side of the steam turbine room away from the deaerator room, and the first inlet and outlet are connected to the maintenance site; there is at least one second inlet and outlet between the second part of the steam turbine room and the electrical distribution room of the deaerator room; and there is at least one third inlet and outlet on the opposite side of the deaerator room away from the steam turbine room, and the third inlet and outlet are connected to the fourth part.

9. The blast furnace gas waste heat power generation main plant according to claim 1, characterized in that: It also includes a main oil tank, an oil cooler and a duplex oil filter which are located in the first part and are respectively connected to the steam turbine.

10. The blast furnace gas waste heat power generation main plant according to claim 1, characterized in that: The roof of the steam engine room is provided with a crane beam, and a crane is arranged on the crane beam.

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