A once-through boiler with high-efficiency waste heat recovery function

Abstract

The utility model relates to the field of once-through boiler discloses a once-through boiler with high -efficient waste heat recovery function, including hearth, the outside of hearth is provided with the air pipe, the right side outside of hearth is fixedly connected with coal economizer through water inlet pipe no.

Description

Technical Field

[0001] This utility model relates to the field of DC boilers, and in particular to a DC boiler with efficient waste heat recovery function. Background Technology

[0002] A once-through boiler is a type of boiler in which the feedwater only needs to pass through the evaporation heating surface once, driven by a feedwater pump, to be converted into steam without needing to circulate.

[0003] The basic structure of an existing once-through boiler consists of a burner, furnace, economizer, water-cooled wall, superheater, turbine, and auxiliary equipment. The principle of a once-through boiler is that feedwater is pumped into the boiler, first heated to saturation temperature in the heating zone, then evaporated into saturated steam in the evaporation zone, and finally heated into superheated steam in the superheating zone, which is then sent to the turbine to do work and generate energy.

[0004] In existing technologies, some once-through boilers exhibit unstable flow in the evaporation heating surface, failing to fully utilize the energy generated by pulverized coal combustion, and producing harmful gases after boiler operation. Therefore, a once-through boiler with efficient waste heat recovery function is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a DC boiler with efficient waste heat recovery function, aiming to improve the problems of waste heat recovery and utilization and harmful gas conversion in the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A once-through boiler with high-efficiency waste heat recovery function includes a burner, an injector fixedly connected to the top of the burner, a furnace fixedly connected to the top of the burner, the injector fixedly connected to the inner bottom of the furnace, a vent pipe provided outside the furnace, a second water inlet pipe provided outside the right side of the furnace, an economizer fixedly connected to the left side of the second water inlet pipe, a first water outlet pipe fixedly connected to the left side of the economizer, a steam drum fixedly connected to the top of the first water outlet pipe, an exhaust pipe provided to the top of the steam drum, a superheater fixedly connected to the bottom of the exhaust pipe, a steam turbine fixedly connected to the right side of the superheater, a condenser fixedly connected to the right side of the steam turbine, an exhaust pipe provided to the bottom right side of the furnace, a desulfurization tower fixedly connected to the right side of the exhaust pipe, a flue gas pipe provided to the right side of the desulfurization tower, and a fixture detachably connected to the bottom of the desulfurization tower.

[0008] As a further description of the above technical solution:

[0009] An air preheater is fixedly connected to the bottom right side of the vent pipe, and an air guide is fixedly connected to the front side of the air preheater.

[0010] As a further description of the above technical solution:

[0011] A water purifier is fixedly connected to the bottom of the second water inlet pipe, and a water supply device is fixedly connected to the bottom of the water purifier.

[0012] As a further description of the above technical solution:

[0013] PP cotton is fixedly connected to the lower end of the inside of the water purifier, honeycomb granular activated carbon is fixedly connected to the middle end of the inside of the water purifier, an RO reverse osmosis membrane is fixedly connected to the top end of the inside of the water purifier, and a pressure pump is fixedly connected to the bottom of the RO reverse osmosis membrane.

[0014] As a further description of the above technical solution:

[0015] A water-cooled wall is fixedly connected to the outside of the furnace. The outside of the first water outlet pipe is located on the top left side of the water-cooled wall. A first water inlet pipe is fixedly connected to the outer left side of the water-cooled wall.

[0016] As a further description of the above technical solution:

[0017] A drain pipe is provided on the outer right side of the condenser, a water supply device is fixedly connected to the bottom of the drain pipe, and a water purifier is fixedly connected to the top of the water supply device.

[0018] As a further description of the above technical solution:

[0019] A second water outlet pipe is provided on the left side of the steam drum, and a heat insulator is fixedly connected to the left side of the second water outlet pipe. A hot water supply pipe is provided on the outer left side of the heat insulator.

[0020] As a further description of the above technical solution:

[0021] The desulfurization tower has a slurry storage chamber at the bottom inner side, a slurry conveying pipe at the rear side of the desulfurization tower, a slurry pump fixedly connected to the outside of the slurry conveying pipe, two spray pipes fixedly connected to the top of the slurry conveying pipe, multiple sprayers at the bottom of the spray pipe, and a demister fixedly connected to the top inner side of the desulfurization tower.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, hot water vapor is condensed into condensate by a condenser, which then enters the water supply device through the outlet pipe, is filtered again, and enters the coal-saving gas, thereby achieving the effect of water circulation. The filter makes the water purer and fully converts the water into water vapor, thus making the energy conversion more efficient. The air preheater makes the coal powder burn more completely, thereby achieving the effect of full heat energy release. The heat preservation device stores the excess hot water and supplies it to other hot water supply equipment, thereby achieving the effect of full utilization of resources.

[0024] 2. In this utility model, with the cooperation of the desulfurization tower, a slurry pump is fixedly connected to the outside of the slurry delivery pipe, so that limestone slurry enters the slurry delivery pipe. Multiple sprayers are fixedly connected to the slurry delivery pipe, so that the limestone slurry is evenly sprayed onto the harmful gas discharged from the exhaust pipe, so that the harmful substances in the gas are turned into solid particles. A demister is fixedly connected to the inside of the top of the desulfurization tower. The demister adsorbs the harmful solid particles in the gas, so that the harmful gas is converted into harmless gas, thereby solving the problem of pollutant gas emission. Attached Figure Description

[0025] Figure 1 A three-dimensional schematic diagram of a DC boiler with high-efficiency waste heat recovery function proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of a DC boiler with high-efficiency waste heat recovery function proposed in this utility model.

[0027] Figure 3 This is a schematic diagram of the internal structure of a filter in a DC boiler with high-efficiency waste heat recovery function, as proposed in this utility model.

[0028] Figure 4 This is a schematic diagram of the internal structure of the desulfurization tower of a DC boiler with high-efficiency waste heat recovery function proposed in this utility model.

[0029] Legend:

[0030] 1. Burner; 2. Injector; 3. Furnace; 4. Vent pipe; 5. Air preheater; 6. Air guide; 7. Water-cooled wall; 8. Water inlet pipe one; 9. Water inlet pipe two; 10. Water purifier; 11. PP cotton; 12. Honeycomb granular activated carbon; 13. Pressure pump; 14. RO reverse osmosis membrane; 15. Water feeder; 16. Economizer; 17. Water outlet pipe one; 18. Steam drum; 19. Exhaust pipe; 20. Superheater; 21. Steam turbine; 22. Condenser; 23. Drain pipe; 24. Water outlet pipe two; 25. Insulator; 26. Hot water supply pipe; 27. Exhaust pipe; 28. Desulfurization tower; 29. ​​Slurry storage chamber; 30. Slurry conveying pipe; 31. Slurry pump; 32. Spray pipe; 33. Sprayer; 34. Demister; 35. Flue gas pipe; 36. Fixing device. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1 to 3 This utility model provides an embodiment of a once-through boiler with high-efficiency waste heat recovery function, including a burner 1, an injector 2 fixedly connected to the top of the burner 1, the injector 2 being fixedly connected to the inner side of the bottom of the furnace 3, so that pulverized coal is burned through the burner 1 and sprayed out from the injector 2. The furnace 3 is fixedly connected to the top of the burner 1, and a water-cooled wall 7 is fixedly connected to the outside of the furnace 3. A water inlet pipe 8 is fixedly connected to the left side of the outside of the water-cooled wall 7, and water enters the water-cooled wall 7 from the water inlet pipe 8, absorbing the heat generated by the pulverized coal. After being heated, the water enters the steam drum 18 from the water outlet pipe 17. An air vent pipe 4 is provided outside the furnace 3, and an air preheater 5 is fixedly connected to the bottom right side of the air vent pipe 4. An air guide 6 is fixedly connected to the front side of the air preheater 5, allowing air to enter the air preheater 5 through the air guide 6, be heated by the air preheater 5, and then enter the furnace 3. A second water inlet pipe 9 is provided on the right side of the furnace 3. The bottom of the second water inlet pipe 9 is fixedly connected to a water purifier 10. Inside the water purifier 10, PP cotton 11, honeycomb granular activated carbon 12 and RO reverse osmosis membrane 14 are fixedly connected. The bottom of the RO reverse osmosis membrane 14 is fixedly connected to a pressure pump 13, which allows water to be filtered sequentially. The bottom of the water purifier 10 is fixedly connected to a water supply device 15. The left side of the second water inlet pipe 9 is fixedly connected to an economizer 16, which allows filtered water to enter the economizer 16 and absorb the energy of the smoke generated by the combustion of coal powder. The left side of the economizer 16 is fixedly connected to an outlet pipe 17, and the top of the outlet pipe 17 is fixedly connected to a steam drum 18. The left side of the steam drum 18 is provided with an outlet pipe 24, and the left side of the outlet pipe 24 is fixedly connected to a heat insulator 25, which allows the hot water remaining in the steam drum 18 to enter the heat insulator 25. The left side of the heat insulator 25 is provided with a hot water supply pipe 26, which supplies hot water to other hot water supply devices.

[0033] A steam exhaust pipe 19 is installed at the top of the steam drum 18, and a superheater 20 is fixedly connected to the bottom of the steam exhaust pipe 19, allowing the steam in the steam drum 18 to enter the superheater 20 for secondary heating. A steam turbine 21 is fixedly connected to the right side of the superheater 20, driving the steam turbine 21 to generate energy. A condenser 22 is fixedly connected to the right side of the steam turbine 21, condensing the remaining steam into condensate. A drain pipe 23 is installed on the outer right side of the condenser 22, and a feed water device 15 is fixedly connected to the bottom of the drain pipe 23. The condensate enters the water supply unit 15 through the drain pipe 23. The top of the water supply unit 15 is fixedly connected to the water purifier 10, which filters the condensate again and puts it into circulation. An exhaust pipe 27 is set on the bottom right side of the furnace 3. A desulfurization tower 28 is fixedly connected to the right side of the exhaust pipe 27, which changes the smoke generated by the combustion of pulverized coal from harmful gas to harmless gas. An exhaust pipe 35 is set on the right side of the desulfurization tower 28, which allows the purified gas to be discharged harmlessly. A fixing device 36 is detachably connected to the bottom of the desulfurization tower 28, which fixes the desulfurization tower 28 to the top of the ground.

[0034] Reference Figure 2 and Figure 4 The desulfurization tower 28 has a slurry storage chamber 29 at the bottom inner side to store limestone slurry. A slurry conveying pipe 30 is provided at the rear side of the desulfurization tower 28. A slurry pump 31 is fixedly connected to the outside of the slurry conveying pipe 30 to allow the limestone slurry to enter the slurry conveying pipe 30. Two spray pipes 32 are fixedly connected to the top of the slurry conveying pipe 30. Multiple sprayers 33 are provided at the bottom of the spray pipes 32 to evenly spray the limestone slurry onto the harmful gas discharged from the exhaust pipe 27, turning the harmful substances in the gas into solid particles. A demister 34 is fixedly connected to the top inner side of the desulfurization tower 28. The demister 34 adsorbs the harmful solid particles in the gas, thereby turning the gas into harmless gas.

[0035] Working principle: Pulverized coal is burned in burner 1 and injected into furnace 3 through injector 2. Air guide fan 6 draws air into air preheater 5 for preheating. The heated air then enters furnace 3 through vent pipe 4, ensuring more complete combustion of the pulverized coal. Water enters water purifier 10 through water feeder 15. In water purifier 10, the water is filtered sequentially through PP cotton 11, honeycomb granular activated carbon 12, and RO reverse osmosis membrane 14. After filtration, the water enters economizer 16 through inlet pipe 2 9. Water pipe 18 enters water-cooled wall 7. The heat emitted by the combustion of pulverized coal heats the water in water-cooled wall 7. The waste heat of the flue gas produced by the combustion heats the water in economizer 16. The hot water in water-cooled wall 7 and economizer 16 enters steam drum 18 through outlet pipe 17. The hot water steam produced by the hot water enters superheater 20 through exhaust pipe 19 at the top of steam drum 18. The remaining hot water enters insulator 25 through outlet pipe 24 for heat preservation and storage. The remaining hot water in insulator 25 is transferred to other hot water supply devices through hot water supply pipe 26.

[0036] Hot water steam is reheated in superheater 20 and then enters turbine 21, causing turbine 21 to operate and generate energy. The used steam is condensed in condenser 22 to form condensate. The condensate enters feedwater 15 through drain pipe 23 and then enters water purifier 10 again through feedwater 15 to start the cycle. The flue gas in furnace 3 enters desulfurization tower 28 through exhaust pipe 27. The limestone slurry in slurry storage chamber 29 is pumped by slurry pump 31 and enters spray pipe 32 through slurry delivery pipe 30. It is then sprayed through multiple sprayers 33 at the bottom of spray pipe 32, which turns the sulfur in the flue gas into solid particles. When the flue gas passes through demister 34, the sulfur solid particles are effectively adsorbed by demister 34, turning the flue gas into harmless gas, which is discharged from exhaust pipe 27.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A once-through boiler with high-efficiency waste heat recovery function, comprising a burner (1), characterized in that: An injector (2) is fixedly connected to the top of the burner (1), and a furnace (3) is fixedly connected to the top of the burner (1). The injector (2) is fixedly connected to the inner bottom of the furnace (3). A vent pipe (4) is provided outside the furnace (3). A second water inlet pipe (9) is provided on the outer right side of the furnace (3). An economizer (16) is fixedly connected to the left side of the second water inlet pipe (9). A first water outlet pipe (17) is fixedly connected to the left side of the economizer (16). A steam drum (18) is fixedly connected to the top of the first water outlet pipe (17). A steam exhaust pipe (19) is provided at the top of the steam drum (18). A superheater (20) is fixedly connected to the bottom of the steam exhaust pipe (19). A steam turbine (21) is fixedly connected to the right side of the superheater (20). A condenser (22) is fixedly connected to the right side of the steam turbine (21). An exhaust pipe (27) is provided at the bottom right side of the furnace (3). A desulfurization tower (28) is fixedly connected to the right side of the exhaust pipe (27). An exhaust pipe (35) is provided at the right side of the desulfurization tower (28). A fixture (36) is detachably connected to the bottom of the desulfurization tower (28).

2. A once-through boiler with high-efficiency waste heat recovery function according to claim 1, characterized in that: An air preheater (5) is fixedly connected to the bottom right side of the vent pipe (4), and an air guide (6) is fixedly connected to the front side of the air preheater (5).

3. A once-through boiler with high-efficiency waste heat recovery function according to claim 1, characterized in that: The bottom of the second water inlet pipe (9) is fixedly connected to a water purifier (10), and the bottom of the water purifier (10) is fixedly connected to a water supply device (15).

4. A once-through boiler with high-efficiency waste heat recovery function according to claim 3, characterized in that: The lower end of the water purifier (10) is fixedly connected to PP cotton (11), the middle end of the water purifier (10) is fixedly connected to honeycomb granular activated carbon (12), the top end of the water purifier (10) is fixedly connected to an RO reverse osmosis membrane (14), and the bottom of the RO reverse osmosis membrane (14) is fixedly connected to a pressure pump (13).

5. A once-through boiler with high-efficiency waste heat recovery function according to claim 1, characterized in that: The furnace (3) is fixedly connected to a water-cooled wall (7), and the water outlet pipe (17) is located on the top left side of the water-cooled wall (7). The water inlet pipe (8) is fixedly connected to the outer left side of the water-cooled wall (7).

6. A once-through boiler with high-efficiency waste heat recovery function according to claim 1, characterized in that: A drain pipe (23) is provided on the outside right side of the condenser (22). A water supply device (15) is fixedly connected to the bottom of the drain pipe (23), and a water purifier (10) is fixedly connected to the top of the water supply device (15).

7. A once-through boiler with high-efficiency waste heat recovery function according to claim 1, characterized in that: A second water outlet pipe (24) is provided on the left side of the steam drum (18), and a heat insulator (25) is fixedly connected to the left side of the second water outlet pipe (24). A hot water supply pipe (26) is provided on the outer left side of the heat insulator (25).

8. A once-through boiler with high-efficiency waste heat recovery function according to claim 1, characterized in that: The desulfurization tower (28) has a slurry storage chamber (29) on the inner side of its bottom. A slurry conveying pipe (30) is provided on the rear side of the desulfurization tower (28). A slurry pump (31) is fixedly connected to the outside of the slurry conveying pipe (30). Two spray pipes (32) are fixedly connected to the top of the slurry conveying pipe (30). Multiple sprayers (33) are provided at the bottom of the spray pipes (32). A demister (34) is fixedly connected to the inner side of the top of the desulfurization tower (28).

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