External reheating single-channel waste heat boiler of high-parameter garbage incinerator

Abstract

The utility model discloses a high-parameter garbage incinerator external reheating single-channel waste heat boiler, which comprises a flue, a steam pocket and a reheater, the flue sequentially comprises a vertical flue, a horizontal flue and a bent flue from the flue gas direction to the outside, a water cooling wall is arranged in the vertical flue to serve as an evaporation heating surface for generating saturated steam, and the steam pocket is arranged in the horizontal flue to serve as an evaporation heating surface. The steam pocket is arranged above the horizontal flue, connected with the water cooling wall and used for containing saturated steam, the reheater is arranged above the steam pocket and connected to the steam pocket and a steam turbine exhaust pipeline, reheated steam passes through a shell of a pipe bundle in the reheater from a steam turbine exhaust pipe flow channel, the saturated steam is conveyed into the pipe bundle of the reheater from the steam pocket, and the saturated steam is conveyed into the steam turbine exhaust pipeline. And the heat is transferred to the reheated steam. By arranging the reheater outside the boiler, the reheater is prevented from making contact with flue gas, the problem that the heating surface of the reheater is corroded by high-temperature flue gas in the boiler can be effectively solved, the heat efficiency of a whole plant unit can be effectively improved, the area of an excessive superheater does not need to be increased, and the investment cost and the occupied area of the boiler are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to single channel vertical boiler and contain reheating system, especially a kind of high parameter waste incinerator outer reheat single channel waste heat boiler. BACKGROUND

[0002] Compared with sanitary landfill, compost and other waste disposal technologies, incineration disposal technology has obvious effect of volume reduction and weight reduction, complete harmless, and small land occupation area, in addition, waste heat can be used for heating or power generation, secondary pollution is less and controllable, etc., has gradually become the mainstream technology of municipal solid waste disposal in China.

[0003] In waste incineration power generation technology, waste incinerator is the core equipment of the process, and at present, the main types of domestic and foreign application, technology is relatively mature municipal solid waste incinerator are mechanical grate furnace, fluidized bed incinerator, pyrolysis incinerator, rotary kiln incinerator four categories.Mechanical grate furnace adopts stratified combustion technology, has the advantages of low requirement for waste pretreatment, wide range of waste heat value adaptation and simple operation and maintenance.Mechanical grate furnace is the most commonly used, largest treatment capacity and best applicability municipal solid waste incinerator type in the world, and the technology is mature and reliable.The main steam operating parameters of domestic waste power plant have developed from the initial medium temperature and medium pressure (4.0Mpa, 400℃) to medium temperature and secondary high pressure (6.4Mpa, 450℃) and secondary high temperature and secondary high pressure (6.8Mpa, 485℃).In recent years, in order to further improve economic benefit, some foreign projects (13Mpa, 440℃) use the furnace outer reheat technology of using drum extraction steam to heat high pressure cylinder exhaust.In recent years, in order to further improve economic benefit, some foreign projects (13Mpa, 440℃) use the furnace outer reheat technology of using drum extraction steam to heat high pressure cylinder exhaust.At present, the overall thermal efficiency of domestic and foreign waste power plants has increased from 23% of the initial medium temperature and medium pressure unit to 31% of the current medium temperature and superhigh pressure reheating unit, and the economic efficiency has been significantly improved, and domestic manufacturers have also begun to use reheating unit with higher unit efficiency.

[0004] In the prior art, the heating surface position of the superheater is generally designed to have high flue gas temperature, so as to reach the design temperature, however, the high parameter reheating unit of the boiler faces the problem of high temperature corrosion of the heating surface, the high flue gas temperature will cause high temperature corrosion effect on the furnace wall, the thermal efficiency is relatively low, and the investment cost is large and the land occupation area is large. UTILITY MODEL CONTENTS

[0005] Therefore, it is necessary to solve the above problems, and the utility model provides a kind of high parameter waste incinerator outer reheat single channel waste heat boiler.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A kind of high parameter waste incinerator outer reheat single channel waste heat boiler, comprising:

[0008] The flue, from the flue gas direction outward, comprises a vertical flue, a horizontal flue and a curved flue in sequence, one end of the horizontal flue is connected to the upper end of the vertical flue perpendicularly to form a first bending part, the curved flue is connected to the other end of the horizontal flue perpendicularly to form a second bending part, a water-cooled wall is arranged in the vertical flue, which is used as an evaporation heating surface to generate saturated steam; a steam drum is arranged above the horizontal flue, the steam drum is connected to the water-cooled wall and used to contain the saturated steam; a reheater is arranged above the steam drum, the reheater is connected to the steam drum and a steam turbine exhaust pipe, reheated steam flows through the outer shell of a tube bundle in the reheater from the steam turbine exhaust pipe, and saturated steam is sent to the tube bundle from the steam drum to transfer heat to the reheated steam.

[0009] In some embodiments, a superheater is further included, the superheater comprises a first-stage superheater, a second-stage superheater and a third-stage superheater, the second-stage superheater and the third-stage superheater are arranged in parallel in the horizontal flue close to the first bending part, and the first-stage superheater is arranged in the horizontal flue close to the second bending part.

[0010] In some embodiments, a furnace is further included, the furnace is connected to the lower end of the vertical flue, the furnace and the two side walls of the flue are both provided with water-cooled membrane walls, end portions of the water-cooled membrane walls are provided with a water-cooled wall upper header and a water-cooled wall lower header, the water-cooled wall upper header is connected to the steam drum through a steam-water connection pipe, and the water-cooled wall lower header is connected to the steam drum through a lower water connection pipe.

[0011] In some embodiments, a grate is further included, the furnace and the grate are connected by a flexible expansion joint.

[0012] In some embodiments, a header inter-temperature regulator is arranged between the first-stage superheater and the second-stage superheater, and the header inter-temperature regulator is used to control the temperature of main steam.

[0013] In some embodiments, the surface of the vertical flue is coated with refractory material.

[0014] In some embodiments, the upper portion of the vertical flue and the ceiling area of the horizontal flue are anticorrosive by using SiC hanging bricks.

[0015] In some embodiments, an economizer is further included, the economizer is arranged in the curved flue, the superheater is provided with a first soot blowing device, the economizer is provided with a second soot blowing device, and the superheater and the economizer use steam to clean.

[0016] In some embodiments, the second-stage superheater and the third-stage superheater further comprise a mechanical rapping device for cleaning.

[0017] In some embodiments, the secondary superheater and the tertiary superheater are arranged in series and in parallel flow along the flue gas direction, and the primary superheater is arranged in series and in counter flow along the flue gas direction.

[0018] The utility model provides a kind of high parameter waste incinerator outer reheat single passage waste heat boiler, reheat device is placed in furnace, avoid reheat device and flue gas contact, can effectively solve the problem that the heating surface of reheat device is corroded by high temperature flue gas in boiler, can effectively improve the thermal efficiency of whole plant unit.

[0019] According to the different smoke temperature window, the tertiary superheater and the secondary superheater are arranged in parallel at the top of the horizontal flue in the high temperature area, this single passage boiler design can effectively reduce the total length of the boiler, while ensuring that the main steam temperature of the waste heat boiler is increased to 450-480℃, the reheat steam temperature reaches 400-450℃, and the safety and reliability of the reheat device and the heat exchange efficiency of the boiler are improved, without the need to increase the area of the superheater, reducing the investment cost and land area of the boiler. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a kind of high parameter waste incinerator outer reheat single passage waste heat boiler three-dimensional structure schematic diagram of the utility model.

[0021] The marks in the drawings are described as follows:

[0022] 1, flue; 11, vertical flue; 111, water wall; 112, first bending part; 12, horizontal flue; 123, second bending part; 13, bent flue; 2, steam drum; 3, reheat device; 4, superheater; 41, primary superheater; 42, secondary superheater; 43, tertiary superheater; 45, mechanical rapping device; 5, furnace; 6, grate; 7, economizer. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the utility model, the utility model will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as being "connected" to another element, it can be directly on the other element or one or more intervening elements can be present therebetween. The terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" and the like used in the specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] In order to solve the problems of high temperature corrosion of high-temperature heating surface, low thermal efficiency, large investment cost and large occupied area of boiler reheater and furnace wall in the prior art caused by high flue gas temperature, a high-parameter waste incinerator external reheating single-channel waste heat boiler is provided.

[0026] The application will be described in detail below with reference to the accompanying drawings. Figure 1 A high-parameter waste incinerator external reheating single-channel waste heat boiler is described in detail.

[0027] Please refer to Figure 1 , Figure 1 It is a high-parameter waste incinerator external reheating single-channel waste heat boiler three-dimensional structure schematic diagram.

[0028] A high-parameter waste incinerator external reheating single-channel waste heat boiler, comprising:

[0029] The flue 1 comprises a vertical flue 11, a horizontal flue 12 and a curved flue 13 from the flue gas direction outward in sequence, one end of the horizontal flue 12 is connected to the upper end of the vertical flue 11 to form a first bending part 112, the curved flue 13 is connected to the other end of the horizontal flue 12 to form a second bending part 123, and the vertical flue 11 is provided with a water-cooled wall 111, which is used as an evaporation heating surface to generate saturated steam.

[0030] The steam drum 2 is arranged above the horizontal flue 12, and the steam drum 2 is connected with the water-cooled wall 111 and used for containing the saturated steam.

[0031] The reheater 3 is arranged above the steam drum 2, and the reheater 3 is connected to the steam drum 2 and a steam turbine exhaust pipe L, reheated steam flows through the outer shell of the tube bundle in the reheater 3 from the steam turbine exhaust pipe, and saturated steam is sent to the tube bundle from the steam drum 2 to transfer heat to the reheated steam.

[0032] Specifically, the high parameter refers to the main steam parameter of the boiler, and the temperature is 450 degrees Celsius and the pressure is above 13 megapascals, and the waste incinerator needs to be matched with a waste heat boiler for heat absorption, the incinerator is used for incineration, and the waste heat boiler is used for heat absorption.

[0033] A plurality of parallel pipes of the water cooling wall 111 are laid around the furnace 5 and serve as evaporation heating surfaces for absorbing the radiant heat of the high-temperature flame and flue gas in the furnace 5, vaporizing the water in the water cooling wall 111 to generate saturated steam, and delivering the saturated steam to the steam drum 2. Due to the high temperature of the flame in the furnace and the low flue gas velocity, the heat absorption is mainly through radiation. The flue gas is cooled to a low enough temperature at the outlet of the furnace 5 to protect the furnace wall. The vertical flue is provided with a flue bending corner to increase the disturbance of the flue gas.

[0034] Due to the presence of the water cooling wall 111, the flame can only partially or completely not contact the furnace wall, thereby playing a protective role. In addition, the water cooling wall 111 can also play a role in suspending the furnace wall and preventing the furnace wall from being slagged.

[0035] In the prior art, the reheater 3 is generally arranged in the flue 1, and the reheated steam in the reheater 3 is heated by the flue gas to make the reheated steam do work on the steam turbine. The present application adds an external reheater 3 to effectively improve the thermal efficiency of the whole plant. According to different flue gas temperature windows, the third superheater 43 and the second superheater 42 are arranged side by side at the top of the horizontal flue 12 in the high-temperature region, and the external reheater 3 is arranged above the top of the steam drum 2. The reheater 3 is connected to the steam drum 2 and the steam turbine exhaust pipe L. The reheated steam flows from the steam turbine exhaust pipe L to the outer shell of the tube bundle in the reheater 3, and the saturated steam is sent from the steam drum 2 to the tube bundle. The outer shell of the tube bundle serves as a medium for heat conduction. The temperature of the saturated steam in the tube bundle decreases, and the temperature of the superheated steam outside the tube bundle increases, thereby achieving heat transfer to the reheated steam. Compared with the prior art in which the reheater 3 is arranged in the flue 1, arranging the reheater 3 outside the flue 1 can avoid the contact between the external reheater 3 and the flue gas of the boiler, thereby reducing high-temperature corrosion.

[0036] This single-channel boiler design can effectively reduce the total length of the boiler, increase the main steam temperature of the waste heat boiler to 450-480℃, and increase the reheated steam temperature to 300-350℃. The safety and reliability of the reheater 3 and the heat exchange efficiency of the boiler are improved, and the area of the superheater 4 and the reheater 3 does not need to be increased, thereby reducing the investment cost and the occupied area of the boiler.

[0037] In one embodiment, the superheater 4 further includes a first superheater 41, a second superheater 42, and a third superheater 43. The second superheater 42 and the third superheater 43 are arranged side by side in the horizontal flue 12 close to the first bending part 112. The first superheater 41 is arranged in the horizontal flue 12 close to the second bending part 123.

[0038] Specifically, the secondary superheater 42 and the tertiary superheater 43 are symmetrically arranged at the top of the vertical flue 11, and along the direction of the flue gas, the secondary superheater 42 and the tertiary superheater 43 heat the saturated steam in the steam drum 2 to make the saturated steam become superheated steam, and the primary superheater 41 is arranged after the secondary superheater 42 and the tertiary superheater 43, which is used to further heat the superheated steam to further increase the temperature of the water vapor, the secondary superheater 42 and the tertiary superheater 43 are selected to be semi-radiation type and arranged near the outlet of the upper part of the furnace 5, which absorbs the heat radiation of the flame in the furnace 5 and absorbs the heat of the flue gas flowing through it in a convection manner, the primary superheater 41 is selected to be a convection type and mainly distributed in the convection flue 1 outside the furnace 5, which absorbs the heat of the flue gas through the convection heat transfer mode, and the width of the secondary superheater 42 and the tertiary superheater 43 is half of that of the primary superheater 41.

[0039] The superheaters 4 cooperate with each other in the boiler to jointly ensure that the steam reaches the required superheated temperature and pressure, thereby improving the efficiency and quality of the boiler system.

[0040] In one embodiment, the furnace 5 is further included, which is connected to the lower end of the vertical flue 11, and the membrane water wall 111 is arranged on both sides of the furnace 5 and the flue 1, the end of the membrane water wall 111 is provided with a water wall upper header 113 and a water wall lower header 114, the water wall upper header 113 is connected to the steam drum 2 through a steam-water connection pipe, and the water wall lower header 114 is connected to the steam drum 2 through a lower water connection pipe.

[0041] The water in the membrane water wall 111 is heated to a water-vapor mixed state, flows upward to the water wall upper header 113, and the water-vapor flow of the water wall upper header 113 flows to the steam drum 2, the water in the steam drum 2 flows to the water wall lower header 114 from the downcomer, and then enters the water wall 111, and circulates in turn.

[0042] The membrane water wall 111 is a specific type of water wall 111, which is composed of finned tube tailor-welded and light pipe and flat steel strip tailor-welded into airtight screen, has good furnace 5 airtightness, can significantly reduce the air leakage of the furnace 5, is suitable for the case of micro-positive pressure combustion, has good furnace 5 airtightness, ensures that the furnace 5 has good tightness, for the negative pressure boiler, this can reduce the air leakage coefficient of the furnace 5, thereby improving the combustion condition in the furnace, increasing the effective radiation heating area, and helping to save steel consumption.

[0043] The membrane water-cooled wall 111 is applied to the furnace 5 to form a water-cooled furnace. The water-cooled furnace absorbs the radiant heat in the furnace to reduce the temperature of the furnace wall, thereby protecting the furnace wall from high-temperature damage. The water-cooled furnace can simplify the structure of the furnace wall and reduce the weight of the furnace wall by absorbing the heat radiation. The water-cooled furnace cools the flue gas to a sufficiently low temperature, which helps to prevent slagging at the outlet of the furnace 5. The water-cooled furnace is designed to cool the furnace 5 to prevent high-temperature damage, and can also achieve multiple functions such as cooling, heating, and evaporation.

[0044] In one embodiment, the furnace 5 is connected to the grate 6 by a flexible expansion joint.

[0045] Specifically, the grate 6 is located at the bottom of the furnace 5 and includes a drying section, a pyrolysis section, a combustion section, and a burnout section. The grate 6 is connected to the water-cooled furnace below and the waste heat boiler (also referred to as a waste heat boiler) above. The flexible expansion joint is used to connect the furnace 5 and the grate 6, absorb the displacement caused by thermal expansion and cold shrinkage, reduce the pressure on the connection between the furnace 5 and the grate 6, and allow the furnace 5 and the grate 6 to move freely under different temperature, pressure, or vibration conditions. This reduces the stress in the furnace 5 and protects the furnace 5 and the grate 6 from damage.

[0046] When the connection between the furnace 5 and the grate 6 is heated and expands or cools and shrinks, the expansion joint will expand and contract accordingly, preventing excessive stress from concentrating at a certain point of the furnace 5 and the grate 6. It can also effectively absorb the vibrations generated during the operation of the furnace 5 and the grate 6, reduce noise, ensure stable operation of the connection between the furnace 5 and the grate 6, and prolong the service life of the furnace 5 and the grate 6, thereby reducing the cost of the boiler.

[0047] In one embodiment, a temperature regulator 46 between headers is provided between the primary superheater 41 and the secondary superheater 42, which is used to control the temperature of the main steam.

[0048] Specifically, the function of the temperature regulator 46 between headers is to adjust the temperature of the main steam within the design range. When the temperature of the main steam is too high, the temperature of the main steam is adjusted downward. When the temperature of the main steam exceeds the design temperature, the temperature regulator 46 between headers is opened, at which time low-temperature water is sprayed to reduce the temperature. During normal operation, a certain amount of low-temperature desuperheating water is sprayed into the temperature regulator 46 between headers, and the temperature is adjusted by adjusting the amount of water.

[0049] The boiler needs stable main steam pressure and temperature for operation, but during normal operation, the boiler load will be unstable, and the main steam temperature will be high and low. If not controlled, it will cause metal thermal stress fatigue, which is not conducive to the steam pipeline and steam turbine, and even exceeds the allowable temperature of the metal, which poses a safety hazard. Therefore, the temperature regulator 46 between headers can improve the thermal efficiency and safety of the boiler.

[0050] In one embodiment, the surface of the vertical flue 11 is coated with refractory material.

[0051] Specifically, the surface of the vertical flue 11 is a membrane water wall 111, and the refractory material has the characteristics of high temperature resistance, corrosion resistance, and wear resistance, which can meet the use requirements of the furnace 5 area. The purpose of selecting the refractory material is to achieve heat insulation, avoid high temperature corrosion, and improve the service life of the boiler.

[0052] In one embodiment, the upper part of the vertical flue 11 and the ceiling area of the horizontal flue 12 are protected by SiC hanging bricks.

[0053] Specifically, the silicon carbide refractory material has excellent thermal stability, wear resistance, and chemical corrosion resistance. The silicon carbide refractory material can remain stable at temperatures up to 2700 degrees Celsius and has good resistance to slag, reducing the corrosion of the horizontal flue 12.

[0054] At the same time, the side wall in the furnace 5 area is selected from high alumina refractory material to avoid high temperature corrosion.

[0055] In one embodiment, it also includes an economizer 6, which is arranged in the bent flue 13. The superheater 4 is provided with a first soot blowing device, and the economizer 6 is provided with a second soot blowing device 61. The superheater 4 and the economizer 6 use steam for soot blowing.

[0056] Specifically, the economizer 6 includes a multi-stage economizer, which is arranged in the U-shaped bent flue 13. The heat of the boiler tail flue gas is used to heat the boiler feed water for supplementing the steam drum 2, avoiding the temperature drop when the steam drum 2 is replenished, and reducing the exhaust gas temperature. The boiler feed water is heated by the economizer 6 to increase the water temperature and reduce the exhaust gas temperature, reducing heat loss, saving fuel, and improving the efficiency of the boiler.

[0057] Steam soot blowing uses high-pressure steam as a working medium. Through the soot blowing channel and soot blowing device, high-pressure steam is sprayed to the heated surface in a spraying manner, and the impact kinetic energy of high-pressure steam is used for soot removal. It is mainly used for soot blowing of waste heat boilers, which can effectively remove the accumulated ash on the heated surface of the boiler, improve the operating efficiency and safety of the boiler.

[0058] Steam soot blowing includes the following steps: high-pressure steam is sprayed onto the heat exchange surface of the boiler through the soot blowing pipeline and soot blowing device, and the impact kinetic energy of high-pressure steam is used to strip the accumulated ash, which is carried out of the boiler by the power of flue gas and the gravity of dust particles. Steam soot blowing is simple to operate and has high cleaning efficiency. It is suitable for cleaning strongly adhered and difficult to remove ash by mechanical methods. It can effectively remove the accumulated ash on the heated surface of the boiler, improve the thermal efficiency of the boiler, and reduce safety hazards caused by accumulated ash.

[0059] In one embodiment, the secondary superheater 42 and the tertiary superheater 43 further comprise a mechanical rapping device 45 for cleaning ash.

[0060] Specifically, the mechanical cleaning of ash is carried out by generating a vibration force through a mechanical device to vibrate and clean the secondary superheater 42 and the tertiary superheater 43, so that the dust adhered to them falls off, which is conducive to improving the heat transfer efficiency.

[0061] In one embodiment, the secondary superheater 42 and the tertiary superheater 43 are arranged in series and in parallel flow along the flue gas direction, and the primary superheater 41 is arranged in series and in counter flow along the flue gas direction.

[0062] Specifically, the superheater 4 is arranged at the upper part of the horizontal flue 12 and is divided into three stages, and is arranged in the order of the secondary SH2 (in series and in parallel flow), the tertiary SH3 (in series and in parallel flow), and the primary SH1 (in series and in counter flow) along the flue gas flow direction, and adopts one-stage water injection for temperature reduction, and the water injection for temperature reduction adopts a double-pipe structure. The tertiary superheater 43 adopts φ70x8 TP310H pipe, the secondary superheater 42 adopts φ70x8 TP310H pipe, and the primary superheater 41 adopts φ70x8.8 SA210A1 pipe. The steam flows from the pipe of the steam drum 2 into the primary (low-temperature) superheater 4, and the steam is led out from one side of the outlet header of the primary (low-temperature) superheater 4 into the secondary (medium-temperature) superheater 4 and the tertiary (high-temperature) superheater 4, and the steam after the above-mentioned journey reaches 485 DEG C at the outlet header of the high-temperature superheater 4. The tertiary superheater 43 adopts a serpentine pipe structure and is placed on the support device of the header of the horizontal flue 12, and such a structure is conducive to installation and maintenance of the superheater 4.

[0063] The technical problem to be solved by the utility model is that the high-parameter reheat unit of the boiler faces the problem of high-temperature heating surface corrosion, and the high temperature of flue gas will cause high-temperature corrosion effect on the wall of the furnace 5.

[0064] By placing the reheater 3 outside the furnace, the heating section of the furnace external reheater 3 is directly connected with the steam drum 2, the saturated steam of the steam drum 2 fills the whole inside of the furnace external reheater 3, then the reheated steam needing heating exchanges heat with the saturated steam of the steam drum 2 through the pipe bundle of the furnace external reheater 3, and the saturated steam of the steam drum 2 is condensed into water after being cooled, and flows to the boiler water-steam system by gravity, avoids the contact of the reheater 3 with flue gas, and can effectively solve the problem that the heating surface is corroded by high-temperature flue gas in the inside of the boiler.

[0065] Beneficial effects: the utility model provides a kind of high parameter garbage incinerator outer reheat single pass waste heat boiler, by being additionally provided with reheater 3 outside furnace, can avoid reheater 3 and boiler flue gas contact outside furnace, reduce high temperature corrosion. According to the different smoke temperature window, three-stage superheater 43 and two-stage superheater 42 are arranged in high temperature area of the top of horizontal flue 12 in parallel, the flue gas temperature of this area is 850 DEG C, reheater 3 is arranged above the top of steam drum 2 simultaneously, so it can effectively improve the thermal efficiency of the whole plant unit. Single pass boiler design can effectively reduce the total length of boiler, while it can guarantee that waste heat boiler main steam temperature is increased to 450-480 DEG C, reheat steam temperature reaches 300-350 DEG C, and the safety reliability of reheater 3 and the heat exchange efficiency of boiler can be improved, without increasing too much superheater 4 and reheater 3 area, reduce the investment cost and floor area of boiler.

[0066] The above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; under the idea of the utility model, the technical features in the above examples or different examples can also be combined, steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above, which are not provided in details for simplicity; although the utility model is described in detail by referring to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of technical features; and these modifications or replacements do not make the essence of corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A high-parameter waste incinerator external reheat single-pass waste-heat boiler, characterized in that, It comprises: a flue, which comprises a vertical flue, a horizontal flue and a curved flue in sequence from the flue gas direction, one end of the horizontal flue is connected to the upper end of the vertical flue vertically to form a first bending part, the other end of the horizontal flue is connected to the curved flue vertically to form a second bending part, and a water-cooled wall is arranged in the vertical flue, which is used as an evaporation heating surface to generate saturated steam; a steam drum arranged above the horizontal flue, which is connected to the water-cooled wall and used to contain the saturated steam; a reheater arranged above the steam drum, which is connected to the steam drum and a steam turbine exhaust pipe, reheated steam flows through the outer shell of the tube bundle in the reheater from the steam turbine exhaust pipe, and saturated steam is sent to the tube bundle from the steam drum to transfer heat to the reheated steam.

2. A high-parameter waste incineration furnace outer reheating single-pass waste heat boiler according to claim 1, characterized in that, It also comprises a superheater, which comprises a first superheater, a second superheater and a third superheater, the second superheater and the third superheater are arranged side by side in the horizontal flue near the first bending part, and the first superheater is arranged in the horizontal flue near the second bending part.

3. The high-parameter waste incineration furnace external reheat single-pass waste heat boiler according to claim 1, characterized in that, It also comprises a furnace, which is connected to the lower end of the vertical flue, both sides of the furnace and the flue are provided with water-cooled membrane walls, the end of the water-cooled membrane wall is provided with a water-cooled wall upper header and a water-cooled wall lower header, the water-cooled wall upper header is connected to the steam drum through a steam-water connection pipe, and the water-cooled wall lower header is connected to the steam drum through a lower water connection pipe.

4. A high-parameter waste incineration furnace outer reheating single-pass waste heat boiler according to claim 3, characterized in that, It also comprises a grate, which is connected between the furnace and the grate by a flexible expansion joint.

5. A high-parameter waste incinerator external reheat single-pass waste-heat boiler according to claim 2, characterized in that, A header temperature regulator is arranged between the first superheater and the second superheater, which is used to control the temperature of the main steam.

6. A high-parameter waste incineration furnace outer reheating single-pass waste heat boiler according to claim 1, characterized in that, The surface of the vertical flue is coated with refractory material.

7. A high-parameter waste incineration furnace outer reheating single-pass waste heat boiler according to claim 1, characterized in that, SiC hanging bricks are used for corrosion prevention in the upper part of the vertical flue and the ceiling area of the horizontal flue.

8. A high parameter waste incinerator external reheat single pass waste heat boiler according to claim 2, characterized in that, It also comprises an economizer, which is arranged in the curved flue, the superheater is provided with a first soot blowing device, the economizer is provided with a second soot blowing device, and the superheater and the economizer use steam for soot blowing.

9. A high-parameter waste incinerator external reheat single-pass waste-heat boiler according to claim 8, characterized in that, The second superheater and the third superheater also comprise a mechanical rapping device for soot blowing.

10. A high parameter waste incinerator external reheat single pass waste heat boiler according to claim 2, characterized in that, The second superheater and the third superheater are arranged in sequence and in sequence along the flue gas direction, and the first superheater is arranged in sequence and in reverse along the flue gas direction.

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