Connecting structure of AQC boiler

Abstract

The utility model discloses a connecting structure of an AQC boiler, which comprises an AQC waste heat boiler, a coal economizer, an evaporator, an AQC superheater and a strengthening superheater are sequentially arranged in the AQC waste heat boiler from top to bottom, a water supply pipe is arranged on the waste heat boiler, the water supply pipe is connected with the coal economizer, the coal economizer is connected with a steam pocket, the steam pocket is connected with the evaporator, and the AQC superheater is connected with the strengthening superheater. An air outlet of the steam pocket is connected with an AQC superheater, the AQC superheater is sequentially connected with a first three-way pipe, a first control valve and a second three-way pipe, one end of the first three-way pipe is connected with the strengthening superheater, the strengthening superheater is connected with a second control valve, the second control valve is connected with a third three-way pipe, one end of the second three-way pipe is provided with a steam input pipe, and the other end of the second three-way pipe is provided with a steam output pipe. A connecting pipeline is arranged between the three-way pipe II and the three-way pipe III; a control valve III is arranged on the connecting pipeline; the heating device has the advantages of being convenient to use, good in heating effect and simple in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler waste heat utilization, and particularly relates to a connection structure of an AQC boiler. Background Art

[0002] The steam drum is a cylindrical pressure vessel used in water-tube boilers for steam-water separation and steam purification, forming a water circulation loop and storing boiler water. Its primary function is to receive water from the economizer, separate it from the water, supply it to the circulation loop, and deliver saturated steam to the superheater. The drum holds a certain amount of water, providing a certain amount of heat and working fluid storage. This slows down steam pressure fluctuations during operating conditions and acts as a buffer when water supply and load are temporarily out of sync.

[0003] A steam turbine, also known as a steam turbine engine, is a rotary steam-powered device. High-temperature, high-pressure steam passes through a fixed nozzle, accelerating into an airflow and then spraying onto blades. This causes the rotor, equipped with rows of blades, to rotate, simultaneously producing work. Steam turbines are a staple of modern thermal power plants and are also used in the metallurgical and chemical industries, as well as in ship propulsion systems.

[0004] Economizer (English name Economizer) is a device installed in the tail flue of the boiler to recover the waste heat of the exhaust gas. It heats the boiler feed water into a heating surface of saturated water under drum pressure. Because it absorbs the heat of high-temperature flue gas, it reduces the exhaust temperature of the flue gas, saves energy and improves efficiency, so it is called an economizer.

[0005] An AQC boiler (Air Preheater for Clinker Cooling) is a device used in cement production lines to recover waste heat from the clinker cooling process. It primarily recovers waste heat from the clinker cooler at the cement kiln entrance, generating steam through heat exchange for power generation or heating.

[0006] The SP boiler is an industrial equipment. Its feed water comes from the low-temperature economizer of the AQC boiler. It absorbs heat again to produce superheated steam, which is mixed with the superheated steam from the AQC boiler and then sent to the turbine to generate power.

[0007] A superheater, also known as a steam superheater, is a component in a boiler that heats steam from saturation to superheat. Superheaters can be categorized by heat transfer method: convection, radiation, and semi-radiation. Based on their structural characteristics, they can be divided into serpentine, screen, wall, and wall-wrapped types. All consist of several parallel tubes and inlet and outlet headers.

[0008] An evaporator generally refers to an object that converts liquid substances into gas. It consists of two main parts: a heating chamber and an evaporation chamber. The heating chamber provides the heat required for evaporation, causing the liquid to boil and vaporize; the evaporation chamber completely separates the gas and liquid phases.

[0009] The problem with the existing technology is that there is a certain temperature difference when the steam from the AQC boiler and the SP boiler is mixed, and the consumption during the steam transportation process can easily lead to insufficient mixed steam temperature, affecting the operation of the turbine; the steam temperature of the AQC boiler and the steam temperature of the SP boiler cannot be adjusted, resulting in inconvenience in adjusting the final mixed steam temperature when it is abnormal. Summary of the Invention

[0010] The purpose of the utility model is to solve the problems existing in the prior art and provide a connection structure for an AQC boiler, which has the advantages of being easy to use, having a good heating effect and a simple structure.

[0011] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an AQC boiler connection structure, comprising an AQC waste heat boiler, a flue gas inlet is provided at the bottom of the AQC waste heat boiler, a flue gas outlet is provided at the top of the AQC waste heat boiler, an economizer, an evaporator, an AQC superheater, and an enhanced superheater are sequentially arranged in the AQC waste heat boiler from top to bottom, a water feed pipe is provided on the waste heat boiler, the water feed pipe is connected to the economizer, the economizer is connected to a steam drum, and the steam drum is connected to the steam drum. The steam drum has an outlet connected to an AQC superheater, which is sequentially connected to a tee-pipe 1, a control valve 1, and a tee-pipe 2. One end of the tee-pipe 1 is connected to the enhanced superheater, which is connected to a control valve 2. The control valve 2 is connected to a tee-pipe 3. The tee-pipe 3 is used to connect to a steam turbine. One end of the tee-pipe 2 is provided with a steam input pipe for connecting to an SP boiler. A connecting pipeline is provided between the tee-pipes 2 and 3, and the connecting pipeline is provided with a control valve 3.

[0012] In the above scheme, flue gas enters the flue gas inlet of the AQC waste heat boiler and passes through the enhanced superheater, AQC superheater, evaporator, economizer in sequence before being discharged from the flue gas outlet. The water in the water supply pipe is preheated in the economizer and then flows to the evaporator for evaporation. The evaporated saturated steam flows through the steam drum to the AQC superheater for heating to form superheated steam. The superheated steam is mixed with the main steam of the SP boiler through a T-piece. The mixed steam is then sent to the enhanced superheater for reheating. The resulting steam enters the steam turbine to generate power.

[0013] Furthermore, a temperature detector 1 for detecting the temperature of the SP boiler steam is provided on the steam input pipe, and a temperature detector 2 is provided between the AQC superheater and the tee pipe 1.

[0014] Temperature detector 1 and temperature detector 2 are set to detect the connection structure of the AQC boiler and the temperature of the output steam of the SP boiler, so as to determine whether the SP boiler steam needs to be introduced into the enhanced superheater for heating.

[0015] Furthermore, several layers of supporting beam structures are provided in the connection structure of the AQC boiler, and the economizer, evaporator, AQC superheater and enhanced superheater are respectively provided on the supporting beam structures.

[0016] The economizer, evaporator, AQC superheater and enhanced superheater are supported and positioned by the supporting beam structure, making it convenient for them to contact with high-temperature flue gas for heat exchange.

[0017] Furthermore, a plurality of mounting openings are provided on the side walls of the connection structure of the AQC boiler, the mounting openings corresponding to the positions of the support beam structures, and detachable covers are provided at the mounting openings.

[0018] The installation opening can be used for the installation and maintenance of economizers, evaporators, AQC superheaters, and reinforced superheaters. The bottom position of the installation opening corresponds to the height of the support beam structure, which is convenient for construction. A cover is provided to seal the side wall of the AQC boiler to ensure the thermal insulation effect and prevent smoke overflow.

[0019] Furthermore, the sealing cover includes a metal cover plate, and a second insulation layer is provided on the outer side of the metal cover plate.

[0020] The metal cover is used to ensure the stability of the internal structure and the second insulation layer is used to ensure the internal flue gas temperature.

[0021] Furthermore, a connection hole for pipeline connection is provided on the cover, and a blocking structure is provided between the connection hole and the pipeline.

[0022] The connecting holes are used for the passage of pipes connecting the economizer, evaporator, AQC superheater and reinforced superheater, which is convenient for the passage of water and gas. The gaps between the connecting holes and the pipes are blocked by the sealing structure to ensure the thermal insulation effect and prevent smoke overflow.

[0023] Furthermore, the sealing structure includes an insulation layer 1 arranged on the outer ring of the pipeline, and a fastening structure is provided on the outer side of the insulation layer 1.

[0024] Heat insulation is achieved through the thermal insulation layer 1, which is fastened to the outer ring of the pipe through the fastening structure.

[0025] Furthermore, an ash hopper is provided at the bottom of the connection structure of the AQC boiler.

[0026] An ash hopper is provided to collect and discharge dust deposited inside the AQC boiler.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. By installing AQC superheaters and enhanced superheaters in the AQC boiler, the steam in the drum is heated at multiple levels. At the same time, the steam from the SP boiler and the steam from the AQC boiler are mixed and introduced into the enhanced superheater for heating, ensuring that the mixed steam ultimately delivered to the steam turbine has stable performance and good heating effect.

[0029] 2. Control valves 1, 2, and 3 are used to control whether the SP boiler steam is heated by the common superheater, thereby regulating the final mixed steam temperature. This is convenient to use. In conjunction with temperature detectors 1 and 2, the temperatures of the SP boiler steam and the AQC boiler steam can be detected in real time to adjust the control valves accordingly.

[0030] 3. The economizer, evaporator, AQC superheater and enhanced superheater are supported by the support beam structure inside the furnace body. The structure is simple and, combined with the installation openings on the side walls, the economizer, evaporator, AQC superheater and enhanced superheater can be easily installed and maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of a connection structure of an AQC boiler according to Example 1 of the present utility model;

[0032] Figure 2 This is a structural cross-sectional view of the metal cover plate in Example 1 of the present utility model;

[0033] In the figure: 1. AQC waste heat boiler; 2. Flue gas inlet; 3. Flue gas outlet; 4. Economizer; 5. Evaporator; 6. AQC superheater; 7. Strengthened superheater; 8. Feedwater pipe; 9. Steam drum; 10. Tee pipe 1; 11. Control valve 1; 12. Tee pipe 2; 13. Control valve 2; 14. Tee pipe 3; 15. Steam turbine; 16. Steam inlet pipe; 17. Connecting pipe; 18. Control valve 3; 19. Temperature detector 1; 20. Temperature detector 2; 21. Support beam structure; 22. Mounting port; 23. Metal cover; 24. Insulation layer 2; 25. Connection hole; 26. Insulation layer 1; 27. Fastening structure; 28. Ash hopper; 29. Bolt; 30. Sleeve. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solution of the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms front, back, left, right, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed or operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Example 1

[0035] like Figure 1-2 As shown, a connection structure of an AQC boiler includes an AQC waste heat boiler 1, a flue gas inlet 2 is opened at the bottom of the AQC waste heat boiler 1, a flue gas outlet 3 is opened at the top of the AQC waste heat boiler 1, an economizer 4, an evaporator 5, an AQC superheater 6, and a reinforced superheater 7 are sequentially arranged in the AQC waste heat boiler 1 from top to bottom, a water supply pipe 8 is provided on the waste heat boiler, the water supply pipe 8 is connected to the economizer 4, the economizer 4 is connected to a steam drum 9, the steam drum 9 is connected to the evaporator 5, and the outlet of the steam drum 9 is connected to the AQC superheater The AQC superheater 6 is connected to a tee 10, a control valve 11, and a tee 2 12 in sequence. One end of the tee 10 is connected to the enhanced superheater 7. The enhanced superheater 7 is connected to a control valve 2 13. The control valve 2 13 is connected to a tee 3 14. The tee 3 14 is used to connect to a steam turbine 15. One end of the tee 2 12 is provided with a steam input pipe 16 for connecting to an SP boiler. A connecting pipe 17 is provided between the tee 2 12 and the tee 3 14. The connecting pipe 17 is provided with a control valve 3 18.

[0036] In the above scheme, flue gas enters the flue gas inlet 2 of the AQC waste heat boiler 1, passes through the enhanced superheater 7, AQC superheater 6, evaporator 5, and economizer 4 in sequence, and is discharged from the flue gas outlet 3. Water in the water supply pipe 8 is preheated in the economizer 4, then flows into the evaporator 5 for evaporation. The evaporated saturated steam flows through the steam drum 9 and flows into the AQC superheater 6 for heating to form superheated steam. The superheated steam is mixed with the main steam of the SP boiler through the tee pipe 10. The mixed steam is then fed into the enhanced superheater 7 for reheating. The resulting steam is then fed into the steam turbine 15 to generate power.

[0037] Under normal working conditions, control valve 1 11 and control valve 2 13 are opened, and control valve 3 18 is closed. The superheated steam passing through the AQC superheater 6 is mixed with the SP boiler steam, superheated through the enhanced superheater 7, and output to the steam turbine 15 to perform work. When the SP boiler steam temperature is high and no superheating is required, control valve 1 11 is closed, control valve 2 13 and control valve 3 18 are opened. The superheated steam passing through the AQC superheater 6 is heated through the enhanced superheater 7, and directly mixed with the SP boiler steam and output to the steam turbine 15 to perform work.

[0038] The steam drum 9 is connected to the evaporator 5 to transport the water in the steam drum 9 to the evaporator 5, and the gas formed in the evaporator 5 returns to the steam drum 9 through a pipeline.

[0039] Furthermore, a temperature detector 19 for detecting the temperature of the SP boiler steam is provided on the steam input pipe 16 , and a temperature detector 20 is provided between the AQC superheater 6 and the tee pipe 10 .

[0040] Temperature detector 1 19 and temperature detector 2 20 are provided to detect the connection structure of the AQC boiler and the temperature of the output steam of the SP boiler, so as to determine whether the SP boiler steam needs to be introduced into the enhanced superheater 7 for heating.

[0041] Temperature detector 3 is installed between tee pipe 3 14 and turbine 15 to detect the temperature of the mixed steam. Temperature detector 1 19, temperature detector 2 20, and temperature detector 3 include pressure gauges.

[0042] Furthermore, several layers of support beam structures 21 are provided in the connection structure of the AQC boiler, and the economizer 4 , evaporator 5 , AQC superheater 6 , and reinforced superheater 7 are respectively provided on the support beam structures 21 .

[0043] The economizer 4, the evaporator 5, the AQC superheater 6 and the reinforced superheater 7 are supported and positioned by the support beam structure 21, so as to facilitate heat exchange with the high-temperature flue gas.

[0044] The supporting beam structure 21 of each layer includes a plurality of cross beams, which can be arranged in parallel or perpendicular to each other.

[0045] Furthermore, a plurality of mounting openings 22 are provided on the side wall of the connection structure of the AQC boiler. The mounting openings 22 correspond to the positions of the support beam structures 21 , and a detachable cover is provided at the mounting openings 22 .

[0046] The installation opening 22 can be used for the installation and maintenance of the economizer 4, the evaporator 5, the AQC superheater 6, and the reinforced superheater 7. The bottom position of the installation opening 22 corresponds to the height of the support beam structure 21, which is convenient for construction. A cover is provided to seal the side wall of the AQC boiler to ensure the thermal insulation effect and prevent smoke overflow.

[0047] The outside of the AQC boiler is provided with a platform support, the height of the platform support corresponds to the position of the installation opening 22, and a ladder is provided between the platform supports to facilitate construction work. The cover is connected to the furnace body of the AQC boiler by bolts 29.

[0048] Furthermore, the sealing cover includes a metal cover plate 23 , and a second insulation layer 24 is provided on the outer side of the metal cover plate 23 .

[0049] The metal cover plate 23 is used to ensure the stability of the internal structure, and the internal flue gas temperature is ensured by the second insulation layer 24.

[0050] The first insulation layer 26 and the second insulation layer 24 are made of high temperature resistant heat insulating materials, such as insulation cotton or aluminum silicate fiber felt or calcium silicate board.

[0051] Furthermore, a connection hole 25 for pipeline connection is provided on the cover, and a blocking structure is provided between the connection hole 25 and the pipeline.

[0052] The pipes connecting the economizer 4, evaporator 5, AQC superheater 6 and enhanced superheater 7 are passed through the connecting hole 25, which is convenient for the passage of water and gas. The gap between the connecting hole 25 and the pipe is blocked by the blocking structure to ensure the heat insulation effect and prevent smoke overflow.

[0053] Furthermore, the blocking structure includes an insulation layer 26 arranged on the outer ring of the pipeline, and a fastening structure 27 is provided on the outer side of the insulation layer 26.

[0054] Thermal insulation is achieved through the thermal insulation layer 26, which is fastened to the outer ring of the pipe through the fastening structure 27.

[0055] The fastening structure 27 may include a binding band or an annular metal plate. A sleeve 30 is provided on the cover, with a connection hole 25 formed in the middle of the sleeve 30. The size of the connection hole 25 matches the size of the pipe. An insulation layer 26 is provided on the outer ring of the sleeve 30 and the pipe.

[0056] Furthermore, an ash hopper 28 is provided at the bottom of the connection structure of the AQC boiler.

[0057] An ash hopper 28 is provided for collecting and discharging dust deposited inside the AQC boiler.

[0058] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An AQC boiler connection structure, comprising an AQC waste heat boiler, wherein a flue gas inlet is provided at the bottom of the AQC waste heat boiler, and a flue gas outlet is provided at the top of the AQC waste heat boiler, characterized in that: An economizer, an evaporator, an AQC superheater, and a reinforced superheater are sequentially arranged in the AQC waste heat boiler from top to bottom. A water feed pipe is provided on the waste heat boiler, the water feed pipe is connected to the economizer, the economizer is connected to a steam drum, the steam drum is connected to the evaporator, and the air outlet of the steam drum is connected to the AQC superheater. The AQC superheater is sequentially connected to a tee pipe 1, a control valve 1, and a tee pipe 2. One end of the tee pipe 1 is connected to the reinforced superheater, the reinforced superheater is connected to a control valve 2, the control valve 2 is connected to a tee pipe 3, the tee pipe 3 is used to connect to a steam turbine, one end of the tee pipe 2 is provided with a steam input pipe for connecting to the SP boiler, a connecting pipeline is provided between the tee pipes 2 and 3, and a control valve 3 is provided on the connecting pipeline.

2. The connection structure of the AQC boiler according to claim 1, characterized in that: The steam input pipe is provided with a temperature detector 1 for detecting the temperature of the SP boiler steam, and a temperature detector 2 is provided between the AQC superheater and the tee pipe 1.

3. The connection structure of the AQC boiler according to claim 1, characterized in that: Several layers of supporting beam structures are arranged in the connection structure of the AQC boiler, and the economizer, evaporator, AQC superheater and enhanced superheater are respectively arranged on the supporting beam structures.

4. The connection structure of the AQC boiler according to claim 3, characterized in that: A plurality of mounting openings are provided on the side walls of the connection structure of the AQC boiler. The mounting openings correspond to the positions of the support beam structures, and detachable covers are provided at the mounting openings.

5. The connection structure of the AQC boiler according to claim 4, characterized in that: The sealing cover comprises a metal cover plate, and a second heat-insulating layer is provided on the outer side of the metal cover plate.

6. The connection structure of the AQC boiler according to claim 4, characterized in that: The cover is provided with a connection hole for pipeline connection, and a blocking structure is provided between the connection hole and the pipeline.

7. The connection structure of the AQC boiler according to claim 6, characterized in that: The blocking structure includes a first insulation layer arranged on the outer ring of the pipeline, and a fastening structure is arranged on the outer side of the first insulation layer.

8. The connection structure of the AQC boiler according to claim 1, characterized in that: An ash hopper is provided at the bottom of the connection structure of the AQC boiler.

Images