Integrated circulating fluidized bed boiler

Abstract

The utility model relates to an integrated circulating fluidized bed boiler. The integrated circulating fluidized bed boiler comprises a feeding device, a hearth, an air chamber, a material returning device, a hot water boiler drum, a separating device, a horizontal flue, a steam boiler drum, a tail flue, a steam outlet header, an SCR device, an air pre-heater, a smoke outlet, a connecting flue, a hot water boiler heating surface and a steam boiler heating surface. According to the integrated circulating fluidized bed boiler, the heating surface required by the hot water boiler and the heating surface required by the steam boiler are integrated and arranged in the integrated circulating fluidized bed boiler, and the integrated circulating fluidized bed boiler can generate superheated steam while producing hot water. Hot water generated by the boiler is externally supplied to users, and generated superheated steam can be used for driving an industrial steam turbine so as to drive a high-power water pump motor and a fan motor arranged on the boiler. According to the utility model, the total power consumption of a heat source plant can be greatly reduced, and the backpressure steam exhausted by the industrial steam turbine can be completely used for heat supply, so that the system has obvious economic benefits.

Description

Technical Field

[0001] This utility model belongs to the field of boiler technology, and specifically discloses an integrated circulating fluidized bed boiler that can simultaneously supply hot water and steam. Background Technology

[0002] In my country's circulating fluidized bed hot water boilers, the circulating water pumps and blowers / induced draft fans are driven by electric motors, resulting in high power consumption and large plant power consumption. Therefore, reducing the power consumption of these motors is of great significance for energy conservation and emission reduction. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an integrated circulating fluidized bed boiler capable of simultaneously producing hot water and superheated steam. The hot water produced by this boiler is supplied to users, while the superheated steam can be used to drive an industrial steam turbine, which in turn drives the high-power water pump motor and fan motor configured in the boiler.

[0004] According to the technical solution provided by this utility model, the integrated circulating fluidized bed boiler includes a feeding device, a furnace, a wind chamber, a return device, a hot water boiler drum, a separation device, a horizontal flue, a steam boiler drum, a tail flue, a steam outlet header, an SCR device, an air preheater, a flue outlet, and a connecting flue.

[0005] The furnace chamber has a circulating material inlet on the lower rear wall and a gas-solid mixture outlet on the upper rear wall. The return material device has a circulating material inlet and a circulating material outlet. The upper end of the separation device has a gas-solid mixture inlet and a flue gas outlet, and the lower end of the separation device has a circulating material outlet.

[0006] The feeding device is fixed on the lower front wall of the furnace, the air chamber is fixed at the lower end of the furnace, the gas-solid mixture outlet of the furnace is connected to the gas-solid mixture inlet of the separation device, the circulating material outlet of the separation device is connected to the circulating material inlet of the return material device, the circulating material outlet of the return material device is connected to the circulating material inlet of the furnace, the flue gas outlet of the separation device is connected to the flue gas inlet of the connecting flue, the flue gas outlet of the connecting flue is connected to the flue gas inlet of the horizontal flue, the flue gas outlet of the horizontal flue is connected to the flue gas inlet of the tail flue, and a flue gas outlet is installed on the flue gas outlet of the tail flue.

[0007] An SCR device and an air preheater are installed in the tail flue, with the air preheater located in front of the SCR device.

[0008] The hot water boiler drum is arranged above the furnace, and the hot water boiler heating surface is installed in the furnace and the tail flue. During operation, the hot water boiler heating surface can heat the user's return water into hot water and store it in the hot water boiler drum.

[0009] The steam boiler drum is arranged above the horizontal flue, and the steam outlet header is arranged outside the tail flue. The steam boiler heating surface is installed inside the tail flue. During operation, the steam boiler heating surface first heats the feedwater into saturated steam and connects it to the steam boiler drum, and then heats the saturated steam from the steam boiler drum into superheated steam and stores it in the steam outlet header.

[0010] Preferably, the heating surface of the hot water boiler includes a water-cooled screen, a high-temperature economizer, and a low-temperature economizer; the water-cooled screen is installed inside the upper end of the furnace, and both the high-temperature economizer and the low-temperature economizer are installed in the tail flue; in use, the hot water return water for hot water users is connected in parallel to the inlet of the water-cooled screen and the inlet of the low-temperature economizer, the hot water outlet of the water-cooled screen is connected to the hot water inlet of the hot water boiler drum, the hot water outlet of the low-temperature economizer is connected to the hot water inlet of the high-temperature economizer, the hot water outlet of the high-temperature economizer is connected to the hot water inlet of the hot water boiler drum, and the hot water outlet of the hot water boiler drum is connected to the hot water user.

[0011] In a further preferred embodiment, the high-temperature economizer is installed in the tail flue behind the SCR unit, and the low-temperature economizer is installed in the tail flue between the SCR unit and the air preheater.

[0012] Preferably, the heating surface of the steam boiler includes a high-temperature evaporator, a superheater, and a low-temperature evaporator installed in the tail flue. During operation, the water inlet of the low-temperature evaporator and the water inlet of the high-temperature evaporator both come from the boiler drum of the steam boiler. The steam outlet of the low-temperature evaporator and the steam outlet of the high-temperature evaporator are connected in parallel to the boiler drum of the steam boiler. The steam outlet of the boiler drum is connected to the steam inlet of the superheater. The steam outlet of the superheater is connected to the steam inlet of the steam outlet header. The steam outlet of the steam outlet header is connected to the industrial steam turbine.

[0013] In a further preferred embodiment, the low-temperature evaporator is located behind the high-temperature economizer, the superheater is located behind the low-temperature evaporator, and the high-temperature evaporator is located behind the superheater.

[0014] This invention integrates the heating surfaces required for both hot water and steam boilers into a single circulating fluidized bed boiler. This integrated circulating fluidized bed boiler produces superheated steam simultaneously with hot water. The hot water produced is supplied to users, while the superheated steam drives an industrial steam turbine, which in turn drives the high-power water pump and fan motors configured in the boiler. This invention significantly reduces the overall electricity consumption of the heat source plant, and since all the back pressure steam discharged from the industrial steam turbine can be used for heating, it offers substantial economic benefits. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 A schematic diagram of a steam-driven industrial steam turbine, circulating water pump, and fan. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] An integrated circulating fluidized bed boiler, such as Figure 1 As shown, it includes a feeding device 1, a furnace 2, a wind chamber 3, a return material device 4, a hot water boiler drum 6, a separation device 7, a horizontal flue 8, a steam boiler drum 9, a tail flue 10, a steam outlet header 12, an SCR device 16, an air preheater 18, a flue gas outlet 19, and a connecting flue 20.

[0019] The furnace 2 has a circulating material inlet on its lower rear wall and a gas-solid mixture outlet on its upper rear wall. The return material device 4 has a circulating material inlet and a circulating material outlet. The upper end of the separation device 7 has a gas-solid mixture inlet and a flue gas outlet, and the lower end of the separation device 7 has a circulating material outlet.

[0020] The feeding device 1 is fixed on the lower front wall of the furnace 2, the air chamber 3 is fixed on the lower end of the furnace 2, the gas-solid mixture outlet of the furnace 2 is connected to the gas-solid mixture inlet of the separation device 7, the circulating material outlet of the separation device 7 is connected to the circulating material inlet of the return material device 4, the circulating material outlet of the return material device 4 is connected to the circulating material inlet of the furnace 2, the flue gas outlet of the separation device 7 is connected to the flue gas inlet of the connecting flue 20, the flue gas outlet of the connecting flue 20 is connected to the flue gas inlet of the horizontal flue 8, the flue gas outlet of the horizontal flue 8 is connected to the flue gas inlet of the tail flue 10, and a flue gas outlet 19 is installed on the flue gas outlet of the tail flue 10.

[0021] An SCR device 16 and an air preheater 18 are installed in the tail flue 10, with the air preheater 18 located in front of the SCR device 16.

[0022] The hot water boiler drum 6 is arranged above the furnace 2, and the hot water boiler heating surface is installed in the furnace 2 and the tail flue 10. During operation, the hot water boiler heating surface can heat the user's return water into hot water and store it in the hot water boiler drum 6.

[0023] The steam boiler drum 9 is arranged above the horizontal flue 8, and the steam outlet header 12 is arranged outside the tail flue 10. The steam boiler heating surface is installed inside the tail flue 10. During operation, the steam boiler heating surface first heats the feedwater into saturated steam and connects it to the steam boiler drum 9. Then, it heats the saturated steam from the steam boiler drum 9 into superheated steam and stores it in the steam outlet header 12.

[0024] During operation, fuel is fed into the furnace 2 by the self-feeding device 1. The air required for combustion is heated by the air preheater 18 and then fed into the furnace 2 through the air chamber 3. The gas-solid mixture produced after combustion enters the separation device 7. After separation by the separation device 7, the flue gas (carrying the separated fine ash) flows sequentially through the connecting flue 20, the horizontal flue 8 and the tail flue 10, and is finally discharged through the exhaust port 19. The circulating material separated by the separation device 7 is returned to the furnace 2 for circulation via the return material device 4.

[0025] In this utility model, the heating surface of the hot water boiler specifically includes a water-cooled screen 5, a high-temperature economizer 15, and a low-temperature economizer 17; the water-cooled screen 5 is installed inside the upper end of the furnace 2, and the high-temperature economizer 15 and the low-temperature economizer 17 are both installed in the tail flue 10; in use, the hot water return water of the user is connected in parallel to the inlet of the water-cooled screen 5 and the inlet of the low-temperature economizer 17, the hot water outlet of the water-cooled screen 5 is connected to the hot water inlet of the hot water boiler drum 6, the hot water outlet of the low-temperature economizer 17 is connected to the hot water inlet of the high-temperature economizer 15, the hot water outlet of the high-temperature economizer 15 is connected to the hot water inlet of the hot water boiler drum 6, and the hot water outlet of the hot water boiler drum 6 is connected to the hot water user.

[0026] The high-temperature economizer 15 is installed in the tail flue 10 behind the SCR device 16, and the low-temperature economizer 17 is installed in the tail flue 10 between the SCR device 16 and the air preheater 18.

[0027] In this utility model, the heating surface of the steam boiler specifically includes a high-temperature evaporator 11, a superheater 13, and a low-temperature evaporator 14 installed in the tail flue 10. During operation, the water inlet of the low-temperature evaporator 14 and the water inlet of the high-temperature evaporator 11 both come from the boiler drum 9 of the steam boiler. The steam outlet of the low-temperature evaporator 14 and the steam outlet of the high-temperature evaporator 11 are connected in parallel to the boiler drum 9 of the steam boiler. The steam outlet of the boiler drum 9 is connected to the steam inlet of the superheater 13. The steam outlet of the superheater 13 is connected to the steam inlet of the steam outlet header 12. The steam outlet of the steam outlet header 12 is connected to the industrial steam turbine.

[0028] The low-temperature evaporator 14 is located behind the high-temperature economizer 15, the superheater 13 is located behind the low-temperature evaporator 14, and the high-temperature evaporator 11 is located behind the superheater 13.

[0029] like Figure 2 As shown, the high-power water pump motor and fan motor 22 of the integrated circulating fluidized bed boiler of this utility model are driven by the industrial steam turbine 21. The steam used by the industrial steam turbine 21 is produced by the integrated circulating fluidized bed boiler of this utility model. The steam discharged by the industrial steam turbine 21 can be replaced by hot water for heating through the heat exchanger 23.

[0030] The principle of this utility model is:

[0031] This invention integrates the heating surfaces required for both hot water and steam boilers into a single circulating fluidized bed boiler. This boiler produces superheated steam while simultaneously generating hot water. The hot water is supplied to users, while the superheated steam drives an industrial steam turbine 21, which in turn drives a high-power water pump motor and a blower motor 22 mounted on the boiler. This integrated circulating fluidized bed boiler significantly reduces the overall power consumption of the heat source plant, and since all the back pressure steam discharged from the industrial steam turbine 21 can be used for heating, it offers substantial economic benefits.

[0032] The integrated circulating fluidized bed boiler of this utility model has the following advantages:

[0033] 1. By arranging a steam boiler heating surface in the tail flue 10, superheated steam is generated to meet the steam requirements of the industrial steam turbine 21.

[0034] 2. The superheated steam generated by this boiler can be used to drive the high-power circulating water pump motor and fan motor 22 in the heat source plant, thus achieving energy-saving requirements.

[0035] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An integrated circulating fluidized bed boiler, characterized by: The device comprises a feeding device (1), a furnace (2), an air chamber (3), a returning device (4), a hot water boiler drum (6), a separating device (7), a horizontal flue (8), a steam boiler drum (9), a tail flue (10), a steam outlet header (12), an SCR device (16), an air preheater (18), an exhaust port (19) and a connecting flue (20). The lower end rear wall of the furnace (2) is provided with a circulating material inlet, and the upper end rear wall of the furnace (2) is provided with a gas-solid mixture outlet. The feeding device (1) is fixed on the lower end front wall of the furnace (2), the air chamber (3) is fixed on the lower end of the furnace (2), the gas-solid mixture outlet of the furnace (2) is connected with the gas-solid mixture inlet of the separating device (7), the circulating material outlet of the separating device (7) is connected with the circulating material inlet of the returning device (4), the circulating material outlet of the returning device (4) is connected with the circulating material inlet of the furnace (2), the flue gas outlet of the separating device (7) is connected with the flue gas inlet of the connecting flue (20), the flue gas outlet of the connecting flue (20) is connected with the flue gas inlet of the horizontal flue (8), the flue gas outlet of the horizontal flue (8) is connected with the flue gas inlet of the tail flue (10), and the exhaust port (19) is installed on the flue gas outlet of the tail flue (10). The SCR device (16) and the air preheater (18) are installed in the tail flue (10), and the air preheater (18) is located in front of the SCR device (16). The hot water boiler drum (6) is arranged above the furnace (2), and a hot water boiler heating surface is installed in the furnace (2) and the tail flue (10); during operation, the hot water boiler heating surface can heat user return water into hot water and store the hot water in the hot water boiler drum (6). The steam boiler drum (9) is arranged above the horizontal flue (8), the steam outlet header (12) is arranged outside the tail flue (10), and a steam boiler heating surface is installed in the tail flue (10); during operation, the steam boiler heating surface first heats feed water into saturated steam and connects the saturated steam to the steam boiler drum (9), and then heats the saturated steam connected out of the steam boiler drum (9) into superheated steam and stores the superheated steam in the steam outlet header (12).

2. An integrated circulating fluidized bed boiler as set forth in claim 1, characterized in that: The hot water boiler heating surface comprises a water cooling screen (5), a high-temperature coal economizer (15) and a low-temperature coal economizer (17); the water cooling screen (5) is installed inside the upper end of the furnace (2), and the high-temperature coal economizer (15) and the low-temperature coal economizer (17) are both installed in the tail flue (10); during operation, hot water user return water is connected to the water inlet of the water cooling screen (5) and the water inlet of the low-temperature coal economizer (17), the hot water outlet of the water cooling screen (5) is connected to the hot water inlet of the hot water boiler drum (6), the hot water outlet of the low-temperature coal economizer (17) is connected to the hot water inlet of the high-temperature coal economizer (15), the hot water outlet of the high-temperature coal economizer (15) is connected to the hot water inlet of the hot water boiler drum (6), and the hot water outlet of the hot water boiler drum (6) is connected to the hot water user.

3. An integrated circulating fluidized bed boiler as set forth in claim 2, characterized in that: The high-temperature coal economizer (15) is installed in the tail flue (10) behind the SCR device (16), and the low-temperature coal economizer (17) is installed in the tail flue (10) between the SCR device (16) and the air preheater (18).

4. An integrated circulating fluidized bed boiler as claimed in claim 3, characterized in that: The steam boiler heating surface comprises a high-temperature evaporator (11), a superheater (13) and a low-temperature evaporator (14) installed in the tail flue (10); during operation, the water inlet of the low-temperature evaporator (14) and the water inlet of the high-temperature evaporator (11) both come from the steam boiler drum (9), the steam outlet of the low-temperature evaporator (14) and the steam outlet of the high-temperature evaporator (11) are connected to the steam boiler drum (9) in parallel, the steam outlet of the steam boiler drum (9) is connected to the steam inlet of the superheater (13), the steam outlet of the superheater (13) is connected to the steam inlet of the steam outlet header (12), and the steam outlet of the steam outlet header (12) is connected to the industrial steam turbine.

5. An integrated circulating fluidized bed boiler as claimed in claim 4, characterized in that: The low-temperature evaporator (14) is located behind the high-temperature coal economizer (15), the superheater (13) is located behind the low-temperature evaporator (14), and the high-temperature evaporator (11) is located behind the superheater (13).

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