CN112344324A

CN112344324A - Flue gas recirculation system

Info

Publication number: CN112344324A
Application number: CN202011397459.1A
Authority: CN
Inventors: 邓山; 张建忠; 邱国梁; 邓志刚; 杨行炳; 徐良; 周建松
Original assignee: Huaneng Qinmei Ruijin Power Generation Co Ltd
Current assignee: Huaneng Qinmei Ruijin Power Generation Co Ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-02-09

Abstract

The invention discloses a smoke recycling system which comprises a combustion furnace, wherein a first communicating pipe is connected to the position, close to the upper end, of the outer side surface of the combustion furnace, supporting rods are fixedly arranged at the positions, close to the two sides, of the lower end of the combustion furnace, one end of the communicating pipe is provided with a smoke passing pipe, a coal economizer is arranged at the position, close to the middle position, inside the smoke passing pipe, a second communicating pipe is arranged at the position, close to the left side, of the lower end of the coal economizer, a smoke recycling fan is arranged at one end of the second communicating pipe, a first smoke outlet pipe is connected to one side of the smoke recycling fan. The flue gas recirculation system can reduce the radiant heat exchange quantity of the combustion furnace, increase the flue gas flow velocity of a convection heating surface, and improve the reheating steam temperature by 10-20 ℃, so that the combustion furnace efficiency is improved by 0.3-0.6%, and the position between the second smoke outlet pipe and the first smoke outlet pipe can be fixed to prevent flue gas leakage.

Description

Flue gas recirculation system

Technical Field

The invention relates to the field of wind and smoke of thermal power generating units, in particular to a smoke recycling system.

Background

The thermal power generation, utilize the heat energy that the combustible substance produces while burning, through a power generation motive equipment and a power generation way of electric energy of conversion, Chinese coal resources are abundant, the thermal power generation still has enormous potentiality, the thermal generator set is with coal, oils or combustible gas, etc. as fuel, heat the water in the boiler, make it warm, reuse the steam with certain pressure to promote the generating set of the way of gas turbine;

in a flue gas recirculation system in the market, when the load of a unit is lower than 60%, the flow rate of flue gas is small, the temperature of reheated steam is low, the design value cannot be reached, the efficiency of a combustion furnace is influenced, the position between a second smoke outlet pipe and a first smoke outlet pipe cannot be fixed, and flue gas leakage is prevented.

Disclosure of Invention

The invention aims to provide a flue gas recirculation system to solve the problems that when the load of a unit is lower than 60%, the flue gas flow is small, the temperature of reheated steam is low, the design value cannot be reached, the efficiency of a combustion furnace is influenced, the position between a second flue gas outlet pipe and a first flue gas outlet pipe cannot be fixed, and the leakage of the flue gas is prevented in the flue gas recirculation system in the market proposed in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a flue gas recirculation system, includes fires burning furnace, it is connected with communicating pipe one to fire burning furnace lateral surface near the upper end position, it is provided with the bracing piece all to fire burning furnace lower extreme near both sides position, communicating pipe one end is provided with leads to the tobacco pipe, it installs the economizer to lead to the inside intermediate position that is close to of tobacco pipe, the economizer lower extreme is close to left side position and installs communicating pipe two, flue gas recirculation fan is installed to two one ends of communicating pipe, flue gas recirculation fan one side is connected with out tobacco pipe one, it is equipped with out tobacco pipe two to go out tobacco pipe one end is inserted, it passes the activity of burning furnace lateral wall and sets up in its inside bottom to go out two ends of tobacco pipe, the economizer lower extreme is close to right.

Preferably, the shell is installed to logical tobacco pipe one side, electrostatic precipitator is installed to the shell inside wall, the right-hand draught fan of installing of electrostatic precipitator, all be connected with connecting pipe two between draught fan right side and electrostatic precipitator and the draught fan.

Preferably, one end of the connecting pipe penetrates through the side wall of the shell to be connected with the electric dust collector, the right end of the connecting pipe is connected with the desulfurizing tower, and the chimney is installed at the upper end of the desulfurizing tower.

Preferably, go out a tobacco pipe outside cover and be equipped with solid fixed ring one, gu fixed ring two is installed to fixed ring below, gu fixed ring one and the equal fixed mounting in two both ends of solid fixed ring have the connecting block, two sets of the connecting block upper end is inserted and is equipped with the screw rod, the outside cover of screw rod is equipped with the nut.

Preferably, a clamping rod is fixedly mounted on the outer side surface of the smoke outlet pipe close to the two sides of the fixing ring, a groove is formed in the upper end of the clamping rod, an inserting block is mounted inside the groove, and the fixing ring I is matched with the fixing ring II.

Preferably, the first fixing ring is matched with the second fixing ring through the connecting block and the screw rod, the inserting block is movably installed with the clamping rod through the groove, and the second smoke outlet pipe is movably installed with the first smoke outlet pipe through the first fixing ring and the second fixing ring.

Compared with the prior art, the invention has the beneficial effects that: in the flue gas recirculation system, flue gas generated in the working process of a combustion furnace enters the inside of a smoke through a first communicating pipe and then enters the inside of a second communicating pipe through an economizer, under the action of a flue gas recirculation fan, the flue gas enters the inside of the combustion furnace through a first smoke outlet pipe and a second smoke outlet pipe, the flue gas with the flue gas temperature of 100-150 ℃ is extracted from the outlet of the economizer through the flue gas recirculation fan and enters the bottom of the combustion furnace, the radiation heat exchange quantity of the combustion furnace can be reduced, the flue gas flow rate of a convection heating surface is increased, and the reheating steam temperature can be increased by 10-20 ℃, so that the combustion furnace efficiency is increased by 0.3-0.6 percent;

in the smoke recycling system, the first fixing ring and the second fixing ring are respectively arranged on the outer side surface of the smoke outlet pipe, the first fixing ring and the two side surfaces of the second fixing ring are tightly attached between the two groups of clamping rods, then the inserting blocks are arranged in the grooves, the screw rods are inserted into the two groups of connecting blocks, the nuts are rotated to the outside of the screw rods, the two groups of connecting blocks can be fixed, the first fixing ring and the second fixing ring are fixed, the position between the second smoke outlet pipe and the first smoke outlet pipe can be fixed, and smoke leakage is prevented.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of the combustion furnace and the smoke outlet pipe of the present invention;

FIG. 3 is a schematic structural view of a first smoke outlet pipe and a fixing ring according to the present invention;

FIG. 4 is a schematic view of the structure of the burner and the flue pipe of the present invention.

In the figure: 1. a combustion furnace; 2. a support bar; 3. a first communicating pipe; 4. ventilating a smoke pipe; 5. a coal economizer; 6. a second communicating pipe; 7. a flue gas recirculation fan; 8. a first smoke outlet pipe; 9. a second smoke outlet pipe; 10. a first fixing ring; 11. a second fixing ring; 12. connecting blocks; 13. a screw; 14. a nut; 15. a clamping bar; 16. a groove; 17. inserting a block; 18. a first connecting pipe; 19. a housing; 20. an electric dust collector; 21. an induced draft fan; 22. a desulfurizing tower; 23. a chimney; 24. and a second connecting pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a flue gas recirculation system, including firing burning furnace 1, it is connected with communicating pipe 3 to fire 1 lateral surface and be close to the upper end position, it is provided with bracing piece 2 to fire 1 lower extreme and be close to both sides position and all fix to fire 1 lower extreme, 3 one end of communicating pipe is provided with leads to tobacco pipe 4, it installs economizer 5 to lead to the inside intermediate position that is close to of tobacco pipe 4, economizer 5 lower extreme is close to left side position and installs two 6 communicating pipes, 6 one end of communicating pipe is installed flue

gas recirculation fan

7, 7 one side of flue gas recirculation fan is connected with a

tobacco pipe

8, 8 one ends of a tobacco pipe are inserted and are equipped with two 9 of tobacco pipes, 9 one ends of a tobacco pipe pass and fire 1 lateral wall activity setting in its inside bottom, economizer 5 lower extremes is.

A shell 19 is arranged on one side of the smoke passing pipe 4, an electric dust collector 20 is arranged on the inner side wall of the shell 19, an induced draft fan 21 is arranged on the right side of the electric dust collector 20, a second connecting pipe 24 is connected on the right side of the induced draft fan 21 and between the electric dust collector 20 and the induced draft fan 21, one end of a first connecting pipe 18 penetrates through the side wall of the shell 19 to be connected with the electric dust collector 20, a desulfurizing tower 22 is connected on the right end of the second connecting pipe 24, a chimney 23 is arranged at the upper end of the desulfurizing tower 22, a first fixing ring 10 is sleeved outside a smoke outlet pipe 8, a second fixing ring 11 is arranged below the first fixing ring 10, connecting blocks 12 are fixedly arranged at two ends of the first fixing ring 10 and the second fixing ring 11, screw rods 13 are inserted at the upper ends of the two groups of connecting blocks 12, nuts 14 are sleeved outside the screw rods 13, the flue gas is introduced into the bottom of the combustion furnace, so that the radiant heat exchange quantity of the combustion furnace can be reduced, and the flue gas flow rate of a convection heating surface is increased.

Clamping rods 15 are fixedly arranged on the outer side face of the first smoke outlet pipe 8 close to the two sides of the first fixing ring 10, a groove 16 is formed in the upper end of each clamping rod 15, an inserting block 17 is arranged in each groove 16, the first fixing ring 10 is matched with the second fixing ring 11, the first fixing ring 10 is matched with a nut 14 and a second fixing ring 11 through a connecting block 12 and a screw 13, the inserting block 17 is movably arranged with the clamping rods 15 through the groove 16, the second smoke outlet pipe 9 is movably arranged with the first smoke outlet pipe 8 through the first fixing ring 10 matched with the second fixing ring 11, the first fixing ring 10 and the second fixing ring 11 are respectively arranged on the outer side face of the first, meanwhile, two side surfaces of the first fixing ring 10 and the second fixing ring 11 are tightly attached between the two groups of clamping rods 15, then the insert 17 is placed inside the groove 16, the screw 13 is inserted on the two sets of connecting blocks 12, the nut 14 is turned to the outside of the screw 13, two sets of connecting blocks 12 can be fixed, so that the positions of the first fixing ring 10 and the second fixing ring 11 are fixed.

The working principle is as follows: for the smoke recycling system, smoke generated in the working process of the combustion furnace 1 enters the smoke passing pipe 4 through the communicating pipe I3, then enters the communicating pipe II 6 through the coal economizer 5, under the action of the smoke recycling fan 7, the smoke enters the combustion furnace 1 through the smoke outlet pipe I8 and the smoke outlet pipe II 9, the smoke with the smoke temperature of 100-150 ℃ is extracted from the outlet of the coal economizer 5 through the smoke recycling fan 7 and enters the bottom of the combustion furnace, the radiation heat exchange quantity of the combustion furnace can be reduced, the smoke flow rate of a convection heating surface is increased, the reheating steam temperature can be increased by 10-20 ℃, so that the combustion furnace efficiency is increased by 0.3-0.6 percent, the residual smoke is introduced into the electric dust remover 20 arranged in the shell 19 from the connecting pipe I18, introduced into the induced draft fan 21 from the connecting pipe II 24, and then introduced into the desulfurization tower 22 from the connecting pipe II 24, finally, the flue gas is introduced into the atmosphere through a chimney 23, the first fixing ring 10 and the second fixing ring 11 are respectively placed on the outer side face of the first smoke outlet pipe 8, two side faces of the first fixing ring 10 and the second fixing ring 11 are tightly attached between the two groups of clamping rods 15, then the inserting block 17 is placed in the groove 16, the screw 13 is inserted into the two groups of connecting blocks 12, the nut 14 is rotated to the outside of the screw 13, the two groups of connecting blocks 12 can be fixed, the positions of the first fixing ring 10 and the second fixing ring 11 are fixed, the position between the second smoke outlet pipe 9 and the first smoke outlet pipe 8 can be fixed, the flue gas leakage is prevented, and the supporting rod 2 can support the combustion furnace 1.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A flue gas recirculation system comprising a combustion furnace (1), characterized in that: a first communicating pipe (3) is connected to the outer side surface of the combustion furnace (1) near the upper end, the lower end of the combustion furnace (1) is fixedly provided with support rods (2) close to the two sides, one end of the first communicating pipe (3) is provided with a smoke passing pipe (4), a coal economizer (5) is arranged in the smoke passing pipe (4) close to the middle, a communicating pipe II (6) is arranged at the position close to the left side of the lower end of the coal economizer (5), one end of the communicating pipe II (6) is provided with a smoke recirculation fan (7), one side of the smoke recirculation fan (7) is connected with a first smoke outlet pipe (8), one end of the first smoke outlet pipe (8) is inserted with a second smoke outlet pipe (9), one end of the second smoke outlet pipe (9) penetrates through the side wall of the combustion furnace (1) and is movably arranged at the inner bottom end thereof, and a first connecting pipe (18) is arranged at the lower end of the coal economizer (5) close to the right side.

2. A flue gas recirculation system according to claim 1, characterized in that: lead to tobacco pipe (4) one side and install shell (19), electrostatic precipitator (20) are installed to shell (19) inside wall, right-hand draught fan (21) of installing of electrostatic precipitator (20), all be connected with connecting pipe two (24) between draught fan (21) right side and electrostatic precipitator (20) and draught fan (21).

3. A flue gas recirculation system according to claim 1, characterized in that: the shell (19) lateral wall is passed to connecting pipe (18) one end and is linked to each other with electrostatic precipitator (20), and connecting pipe two (24) right-hand member is connected with desulfurizing tower (22), chimney (23) are installed to desulfurizing tower (22) upper end.

4. A flue gas recirculation system according to claim 1, characterized in that: go out tobacco pipe (8) outside cover and be equipped with solid fixed ring (10), gu fixed ring two (11) are installed to fixed ring (10) below, gu fixed ring one (10) and the equal fixed mounting in solid fixed ring two (11) both ends have connecting block (12), two sets of connecting block (12) upper end is inserted and is equipped with screw rod (13), the outside cover of screw rod (13) is equipped with nut (14).

5. A flue gas recirculation system according to claim 1, characterized in that: go out tobacco pipe (8) lateral surface and be close to the equal fixed mounting in solid fixed ring (10) both sides and have clamping bar (15), clamping bar (15) upper end is seted up flutedly (16), recess (16) internally mounted has inserted block (17), gu fixed ring (10) mutually supports with solid fixed ring two (11).

6. A flue gas recirculation system according to claim 4, characterized in that: the first fixing ring (10) is matched with the nut (14) and the second fixing ring (11) through the connecting block (12) and the screw rod (13), the inserting block (17) is movably installed with the clamping rod (15) through the groove (16), and the second smoke outlet pipe (9) is movably installed with the first smoke outlet pipe (8) through the first fixing ring (10) and the second fixing ring (11) in a matched mode.