Flue gas waste heat recovery system for preventing dry burning

Abstract

According to the flue gas waste heat recovery system for preventing dry burning, the economizer water supplementing pipeline is arranged on the boiler main water supply pipeline of the waste heat boiler, and boiler water is connected to the economizer drain pipe system gathering header of the economizer set. The economizer water supplementing pipeline, the economizer drain pipe system gathering header and the drain mother pipe are integrated together through the tee joint, and communication of the three is achieved. Meanwhile, an electric valve and a first check valve are connected in series on a water replenishing pipeline of the economizer, when the waste heat boiler normally operates, the electric valve is opened for replenishing water, and when the economizer is drained, the first check valve can prevent drained water from flowing back into a boiler main water supply pipeline of the waste heat boiler and polluting boiler main water supply; drain water passes through the economizer drain pipe system and the economizer drain pipe system gathering header and is discharged through the drain main pipe connected with the tee joint. The economizer drain pipe system and the economizer drain pipe system gathering header are used as a part of a water supplementing pipeline, so that the fluidity of a medium in the drain pipe system is ensured, and a dead zone of the medium is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste heat recovery systems, and in particular relates to a flue gas waste heat recovery system for preventing dry burning. Background Art

[0002] Flue gas waste heat recovery system is an important energy-saving and emission-reduction equipment, which mainly improves energy efficiency and reduces environmental pollution by recovering and utilizing waste heat in boiler flue gas. Economizer, as the main component of flue gas waste heat recovery system, can be divided into many types according to different designs and layouts, among which screen economizer and serpentine economizer are the two most common types.

[0003] Among them, the panel economizer is composed of multiple rows of vertically arranged tube panels, and each tube panel is composed of several vertical pipes. The medium in the tube of this type of economizer flows up and down. In order to solve the problem of drainage of the heating surface during the start-up and shutdown process, a panel heating surface structure with upper and lower small headers is generally adopted, and a drainage pipe system is set in the lower header of the tube panel to ensure that the heating surface can be controlled to drain during the start-up and shutdown process, and at the same time, it can also ensure that the water in the heating surface can be completely drained. When the boiler is operating normally, these drain valve groups need to be in a completely closed state, which also leads to the formation of medium dead zones in these drain pipe systems, which will dry burn due to long-term heating. At the same time, since there is no new medium added, the tube wall cannot be cooled, the tube wall temperature rises, and the outer wall of the tube produces high-temperature corrosion. Corrosion seriously affects the stability and safety of boiler operation; while the serpentine tube economizer is composed of a series of horizontally arranged parallel elbow tubes (serpentine tubes), without medium dead zones, but it cannot drain water like a panel economizer. When the boiler is out of service for a long time, the residual water or water vapor in these pipes will decompose into oxygen and hydrogen due to the continuous heating of the boiler flue gas, which will cause oxygen corrosion on the inner wall of the pipe. In high-altitude and cold areas, the accumulated water and ice will swell and damage the pipe.

[0004] Of course, similar to the layout of the drain piping system of the screen economizer, there is no effective solution to prevent high-temperature corrosion for the drain piping system of the superheater, and the only option is to replace the severely corroded pipes.

[0005] Therefore, how to overcome the above technical defects is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a flue gas waste heat recovery system for preventing dry burning, ensuring the fluidity of the medium in the drain pipe system and avoiding the generation of medium dead zones.

[0007] In order to solve the above technical problems, the present invention provides a flue gas waste heat recovery system for preventing dry burning, comprising an economizer group, an economizer water supply pipeline, an economizer drain pipe system collection header and an economizer drain pipe system;

[0008] The tube screen of the economizer group is connected to the economizer drain pipe system collecting header through the economizer drain pipe system;

[0009] One end of the economizer water supply pipeline is used for supplying water, and the other end is connected to the economizer drain pipe system header through a tee;

[0010] The other port of the tee is used to communicate with the hydrophobic mother pipe;

[0011] Wherein, an electric valve and a first check valve are connected in series on the economizer water supply pipeline, and the first check valve is close to the port where the economizer water supply pipeline is connected to the tee.

[0012] Optionally, in the above-mentioned flue gas waste heat recovery system for preventing dry burning, the economizer group includes a plurality of economizers, the economizer water supply pipeline includes a water supply main pipe and a plurality of water supply branches, the economizers, the economizer drain pipe system collection header, the economizer drain pipe system, the tees and the water supply branches are of the same number, one end of the water supply main pipe is connected to the boiler main feed water pipeline of the waste heat boiler, and the other end is respectively connected to one end of the plurality of water supply branches, and the other ends of the plurality of water supply branches are sequentially connected to the corresponding tees, the economizer drain pipe system collection header, the economizer drain pipe system and the economizer;

[0013] The electric valve and the first check valve are connected in series on each of the water supply branches.

[0014] Optionally, in the above-mentioned flue gas waste heat recovery system for preventing dry burning, a first stop valve is connected in series to the water supply main pipe.

[0015] Optionally, the flue gas waste heat recovery system for preventing dry burning further includes a superheater group, a superheater drain pipe system, a superheater drain pipe system collection header, and a superheater steam connecting pipe;

[0016] The superheater group includes a plurality of superheaters, and the number of the superheaters, the superheater drain pipe system and the superheater drain pipe system collecting header is consistent;

[0017] The tube panel of the superheater is connected to one end of the superheater drain pipe system, and the other end of the superheater drain pipe system is connected to the superheater drain pipe system collecting header;

[0018] The superheater drain pipe system collecting headers except the last superheater are respectively connected with the drain main pipe and one end of the superheater steam connecting pipe through the tee, and the other end of the superheater steam connecting pipe of the upper stage superheater is connected with the superheater drain pipe system collecting header of the lower stage superheater;

[0019] The superheater drain pipe system of the last superheater is connected to the corresponding drain main pipe through the collection header.

[0020] Optionally, in the above-mentioned flue gas waste heat recovery system for preventing dry burning, a second stop valve is connected in series to each of the superheater steam connecting pipes.

[0021] Optionally, in the above-mentioned flue gas waste heat recovery system for preventing dry burning, a second check valve is connected in series to each of the superheater steam connecting pipes.

[0022] Optionally, in the above-mentioned flue gas waste heat recovery system for preventing dry burning, the superheater group is a screen type superheater group.

[0023] Optionally, in the above-mentioned flue gas waste heat recovery system for preventing dry burning, the economizer group is a screen type economizer group.

[0024] Optionally, in the above-mentioned flue gas waste heat recovery system for preventing dry burning, the waste heat boiler is a waste incineration waste heat boiler.

[0025] Optionally, the above-mentioned flue gas waste heat recovery system for preventing dry burning also includes a waste heat boiler, and one end of the economizer water supply pipeline is connected to the main boiler feed water pipeline of the waste heat boiler for introducing boiler water from the boiler feed water pipeline.

[0026] The present invention provides a flue gas waste heat recovery system for preventing dry burning, which has the following beneficial effects:

[0027] An economizer water supply pipeline is set on the boiler main water supply pipeline of the waste heat boiler to connect the boiler water to the economizer drain pipe system collection tank of the economizer group. The economizer water supply pipeline, the economizer drain pipe system collection tank and the drain main pipe are assembled together by a tee to achieve the connection between the three. At the same time, an electric valve and a first check valve are connected in series on the economizer water supply pipeline. When the waste heat boiler is operating normally, the electric valve is opened for water supply. When the economizer is draining, the first check valve can prevent the drain from flowing back into the boiler main water supply pipeline of the waste heat boiler and polluting the boiler main water supply. The drain is discharged through the economizer drain pipe system and the economizer drain pipe system collection tank through the drain main pipe connected by the tee. The economizer drain pipe system and the economizer drain pipe system collection tank are used as part of the water supply pipeline to ensure the fluidity of the medium in the drain pipe system and avoid the formation of medium dead zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 A schematic structural diagram of an economizer group and a water supply pipeline of a flue gas waste heat recovery system for preventing dry burning provided by an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the structure of an economizer group provided in an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the structure of an economizer water supply pipeline provided in an embodiment of the present invention;

[0032] Figure 4 A schematic structural diagram of a superheater group and a steam connecting pipe of a flue gas waste heat recovery system for preventing dry burning provided by an embodiment of the present invention;

[0033] Figure 5 A schematic structural diagram of a superheater group provided in an embodiment of the present invention.

[0034] In the above picture:

[0035] 110-first economizer (tube screen); 120-first economizer (tube screen);

[0036] 210-water supply main pipe; 220-water supply branch pipe; 230-electric valve; 240-first check valve; 250-first stop valve;

[0037] 310-Economizer drain pipe system collection header; 320-Economizer drain pipe system;

[0038] 410-first superheater (tube screen); 411-first superheater drain pipe system; 420-second superheater (tube screen); 421-second superheater drain pipe system; 430-third superheater (tube screen); 431-third superheater drain pipe system;

[0039] 510-superheater steam connecting pipe; 520-second stop valve; 530-second check valve;

[0040] A- boiler water from the boiler feed water pipeline; B- drain; C- steam in the superheater heat exchange tube; D- steam in the superheater drain pipe system; E- drain;

[0041] Figure 1 In the figure, the yellow arrow indicates the water flow direction in the economizer heat exchange pipe, and the blue arrow indicates the water flow direction in the economizer drain pipe system. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] The core of the present invention is to provide a flue gas waste heat recovery system for preventing dry burning, ensuring the fluidity of the medium in the drain pipe system and avoiding the generation of medium dead zones.

[0044] In order to enable those skilled in the art to better understand the technical solution provided by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Specifically, please refer to Figure 1-Figure 5 The present invention provides a flue gas waste heat recovery system for preventing dry burning, comprising: an economizer group, an economizer water supply pipeline, an economizer drain pipe system collection header 310 and an economizer drain pipe system 320.

[0046] The tube panel of the economizer group is connected to the economizer drain pipe system collecting header 310 through the economizer drain pipe system 320. The main function of the economizer drain pipe system is to ensure the normal operation of the boiler system and maintain the safety of the boiler. Through the economizer drain pipe system, the accumulated water and impurities in the economizer can be effectively removed to prevent equipment damage and reduced efficiency caused by water vapor accumulation. The economizer drain pipe system collecting header 310 mainly plays the role of collecting, mixing and distributing the working fluid. Specifically, the connecting port between the tube panel of the economizer group and the economizer drain pipe system 320 is set at the bottom of the tube panel to facilitate the natural discharge of water under the action of gravity.

[0047] One end of the economizer water supply pipeline is used to introduce water supply, and is used to introduce boiler water A from the boiler feed water pipeline. The other end of the economizer water supply pipeline is connected to the economizer drain pipe system collection header 310 through a tee. The other end of the tee is used to communicate with the drain mother pipe. The economizer water supply pipeline, the economizer drain pipe system collection header 310 and the drain mother pipe are brought together by the tee to achieve the connection between the three. Therefore, the economizer drain pipe system 320 is used as a part of the water supply pipeline through the economizer drain pipe system collection header 310, so as to ensure the fluidity of the medium in the drain pipe system and avoid the formation of medium dead zone.

[0048] Among them, the economizer water supply pipeline is connected in series with an electric valve 230 and a first check valve 240, and the first check valve 240 is close to the port where the economizer water supply pipeline is connected to the tee. When the waste heat boiler is operating normally, the electric valve 230 is opened for water supply. When the economizer is draining, the drain B passes through the economizer, the economizer drain pipe system 320, the economizer drain pipe system collection box 310, and the tee, and is finally discharged to the drain main pipe. The first check valve 240 can prevent the drain from flowing back into the boiler main feed water pipeline of the waste heat boiler and polluting the boiler main feed water.

[0049] The present solution provides a flue gas waste heat recovery system for preventing dry burning. By setting an economizer water supply pipeline, the water supply is connected to the economizer drain pipe system collection header 310 of the economizer group. The economizer water supply pipeline, the economizer drain pipe system collection header 310 and the drain mother pipe are assembled together by a tee to achieve the connection between the three. At the same time, the electric valve 230 and the first check valve 240 are connected in series on the economizer water supply pipeline. When the waste heat boiler is operating normally, the electric valve 230 is opened for water supply. When the economizer is draining, the first check valve 240 can prevent the drain from flowing back and causing pollution. The drain is discharged through the economizer drain pipe system 320 and the economizer drain pipe system collection header 310 through the drain mother pipe connected by the tee. The economizer drain pipe system 320 and the economizer drain pipe system collection header 310 are used as part of the water supply pipeline to ensure the fluidity of the medium in the drain pipe system and avoid the generation of medium dead zones.

[0050] In a specific embodiment, in order to reduce the number of pipelines, the economizer group includes multiple economizers, such as Figure 1 and Figure 2 As shown, the number of the plurality of economizers is two, namely the first economizer 110 and the second economizer 120. The economizer water supply pipeline includes a water supply main 210 and a plurality of water supply branches 220, and the number of economizers, economizer drain pipe system collection header 310, economizer drain pipe system 320, tees and water supply branches 220 is the same.

[0051] One end of the water supply main pipe 210 is connected to the main water supply pipe of the waste heat boiler, and can receive boiler water A from the boiler water supply pipe. The other end of the water supply main pipe 210 is respectively connected to one end of a plurality of water supply branch pipes 220, and the water supply is sent to each economizer through the plurality of water supply branch pipes 220. The other ends of the plurality of water supply branch pipes 220 are sequentially connected to the corresponding tees, the economizer drain pipe system collection header 310, the economizer drain pipe system 320 and the economizer.

[0052] Each water supply branch pipe 220 is connected in series with an electric valve 230 and a first check valve 240 .

[0053] Furthermore, a first stop valve 250 is connected in series to the water supply main pipe 210. The first stop valve 250 is used to control the flow of fluid in the pipeline. When the electric valve 230 fails, the first stop valve 250 can be closed to cut off the pipeline for online maintenance.

[0054] The above arrangement enables the economizer water supply pipeline to supply water to the economizer drain pipe system when the boiler is operating normally, so that the water in the economizer drain pipe system flows normally, avoiding the formation of medium dead zone.

[0055] The superheater is a component in the waste heat boiler that further heats the steam from the saturated temperature to the superheated temperature. It is also called a steam superheater. Superheaters can be divided into serpentine tube superheaters, platen superheaters, wall superheaters and wall-wrapped superheaters according to their structural characteristics. They are all composed of several parallel tubes and inlet and outlet headers. The following superheater is a platen superheater.

[0056] On the basis of the above specific embodiments, the present solution further includes a superheater group, a superheater drain pipe system, a superheater drain pipe system collecting header, and a superheater steam connecting pipe 510.

[0057] The superheater group includes a plurality of superheaters, and the number of superheaters, superheater drain pipe systems and superheater drain pipe system summary headers is consistent.

[0058] The tube screen of the superheater is connected to one end of the superheater drain pipe system, and the other end of the superheater drain pipe system is connected to the superheater drain pipe system collecting header.

[0059] The superheater drain pipe system collecting headers except the last superheater are connected to the drain mother pipe and one end of the superheater steam connecting pipe 510 through a tee, and the other end of the superheater steam connecting pipe 510 of the upper stage superheater is connected to the superheater drain pipe system collecting header of the lower stage superheater.

[0060] The superheater drain pipe system of the last superheater is connected to the corresponding drain main pipe through the collection tank.

[0061] By arranging a superheater steam connecting pipe 510 between the superheater drain pipe system collection and header, when the boiler is running, the steam of the upper superheater flows from the superheater drain pipe system to the superheater drain pipe system collection and header, and then flows to the superheater drain pipe system collection and header of the next superheater through the superheater steam connecting pipe 510, so as to replenish steam for the superheater drain pipe system (the red arrow in 5 is the flow direction of the steam C in the superheater heat exchange tube; the purple arrow is the flow direction of the steam D in the superheater drain pipe system). When the superheater is drained, the drain E is discharged to the drain main pipe through the superheater drain pipe system and the superheater drain pipe system collection and header.

[0062] like Figure 4 and Figure 5As shown, the superheater group includes three superheaters, namely, a first superheater 410, a second superheater 420 and a third superheater 430. Correspondingly, a first superheater drain pipe system 411 is provided at the bottom of the tube panel of the first superheater 410, a second superheater drain pipe system 421 is provided at the bottom of the tube panel of the second superheater 420, and a third superheater drain pipe system 431 is provided at the bottom of the tube panel of the third superheater 430.

[0063] Further, each superheater steam connecting pipe 510 is connected in series with a second stop valve 520. Each superheater steam connecting pipe 510 is connected in series with a second check valve 530. The superheater steam connecting pipe 510 can prevent steam reverse flow by providing the second stop valve 520 and the second check valve 530.

[0064] The above arrangement enables the superheater steam connecting pipe to allow the steam from the upper superheater to flow to the drain pipe system of the next superheater through the superheater drain pipe system when the boiler is operating normally, so that there is always steam flowing in the superheater drain pipe system, avoiding the formation of a medium dead zone.

[0065] In addition, the economizer group adopts a screen type economizer group, and the superheater group adopts a screen type superheater group. Of course, according to actual needs, the economizer group and the superheater group can also adopt other structural forms.

[0066] This solution also includes a waste heat boiler, and one end of the economizer water supply pipeline is connected to the main boiler feed water pipeline of the waste heat boiler, which is used to introduce boiler water A from the boiler feed water pipeline.

[0067] An economizer water supply pipeline is arranged on the boiler main feed water pipeline of the waste heat boiler, and the boiler water is connected to the economizer drain pipe system collection header 310 of the economizer group. When the economizer drains, the first check valve 240 can prevent the drain water from flowing back into the boiler main feed water pipeline of the waste heat boiler and polluting the boiler main feed water.

[0068] This solution can be applied to waste incineration waste heat boilers. Due to different sources of hot flue gas, the boiler parameters and layout types vary greatly. The flue gas waste heat recovery system can replenish water and steam when the boiler feed water is dehydrated and the reheater is cut off, thereby ensuring the safe production of the dry coke quenching waste heat boiler. At the same time, when the boiler is operating normally, it can replenish water and steam to the medium dead zone of the drain pipe system of the screen economizer and screen superheater, avoiding the formation of medium dead zone, thereby ensuring the service life of the waste incineration waste heat boiler pipeline.

[0069] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0070] In the description of this application, the meaning of "plurality" is more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0071] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0072] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0073] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0074] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0075] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A flue gas waste heat recovery system for preventing dry burning, characterized in that: It includes an economizer group, an economizer water supply pipeline, an economizer drain pipe system collection header (310) and an economizer drain pipe system (320); The tube screen of the economizer group is connected to the economizer drain pipe system collecting header (310) through the economizer drain pipe system (320); One end of the economizer water supply pipeline is used for supplying water, and the other end is connected to the economizer drain pipe system collecting header (310) through a tee; The other port of the tee is used to communicate with the hydrophobic mother pipe; The economizer water supply pipeline is connected in series with an electric valve (230) and a first check valve (240), and the first check valve (240) is close to a port where the economizer water supply pipeline is connected to the tee.

2. The flue gas waste heat recovery system for preventing dry burning according to claim 1 is characterized in that: The economizer group comprises a plurality of economizers, the economizer water supply pipeline comprises a water supply main pipe (210) and a plurality of water supply branch pipes (220), the economizers, the economizer drain pipe system collecting header (310), the economizer drain pipe system (320), the tees and the water supply branch pipes (220) are of the same number, one end of the water supply main pipe (210) is connected to the boiler main feed water pipeline of the waste heat boiler, and the other end is respectively connected to one end of the plurality of water supply branch pipes (220), and the other ends of the plurality of water supply branch pipes (220) are sequentially connected to the corresponding tees, the economizer drain pipe system collecting header (310), the economizer drain pipe system (320) and the economizer; Each of the water replenishment branch pipes (220) is connected in series with the electric valve (230) and the first check valve (240).

3. The flue gas waste heat recovery system for preventing dry burning according to claim 2 is characterized in that: The water supply main pipe (210) is connected in series with a first stop valve (250).

4. The flue gas waste heat recovery system for preventing dry burning according to any one of claims 1 to 3, characterized in that: It also includes a superheater group, a superheater drain pipe system, a superheater drain pipe system collection header, and a superheater steam connecting pipe (510); The superheater group includes a plurality of superheaters, and the number of the superheaters, the superheater drain pipe system and the superheater drain pipe system collecting header is consistent; The tube panel of the superheater is connected to one end of the superheater drain pipe system, and the other end of the superheater drain pipe system is connected to the superheater drain pipe system collecting header; The superheater drain pipe system collecting headers of the superheaters other than the last superheater are respectively connected to the drain mother pipe and one end of the superheater steam connecting pipe (510) through the tee, and the other end of the superheater steam connecting pipe (510) of the upper stage superheater is connected to the superheater drain pipe system collecting header of the lower stage superheater; The superheater drain pipe system of the last superheater is connected to the corresponding drain main pipe through the collection header.

5. The flue gas waste heat recovery system for preventing dry burning according to claim 4 is characterized in that: Each of the superheater steam connecting pipes (510) is connected in series with a second stop valve (520).

6. The flue gas waste heat recovery system for preventing dry burning according to claim 4, characterized in that: Each of the superheater steam connecting pipes (510) is connected in series with a second check valve (530).

7. The flue gas waste heat recovery system for preventing dry burning according to claim 4, characterized in that: The superheater group is a platen type superheater group.

8. The flue gas waste heat recovery system for preventing dry burning according to claim 1, characterized in that: The economizer group is a screen type economizer group.

9. The flue gas waste heat recovery system for preventing dry burning according to claim 1, characterized in that: The waste heat boiler is a waste heat boiler for waste incineration.

10. The flue gas waste heat recovery system for preventing dry burning according to claim 1, characterized in that: It also includes a waste heat boiler, one end of the economizer water supply pipeline is connected to the boiler main feed water pipeline of the waste heat boiler, and is used to introduce boiler water (A) from the boiler feed water pipeline.

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