Waste heat boiler

Abstract

The waste heat boiler provided by the utility model comprises a flue, wherein the flue is used for discharging flue gas generated by the waste heat boiler; the boiler barrel is used for discharging steam generated by the waste heat boiler; the vertical coiled pipe superheater is located in the flue, the vertical coiled pipe superheater is used for absorbing heat of flue gas in the flue, and an inlet of the vertical coiled pipe superheater communicates with an outlet of the boiler barrel through a first pipeline; an inlet of the steam exhaust pipe is communicated with an outlet of the vertical coiled pipe superheater, and steam in the vertical coiled pipe superheater can be introduced into the steam exhaust pipe; and an inlet of the heat exchanger is used for introducing heat exchange water, the heat exchanger can absorb heat of flue gas generated by the waste heat boiler so as to heat the heat exchange water into steam, and an outlet of the heat exchanger communicates with an inlet of the vertical coiled pipe superheater. Therefore, the waste heat boiler has the advantage that the evaporation drying speed of water in the vertical coiled pipe superheater can be increased so as to reduce the boiler starting time.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat boilers, in particular to a waste heat boiler. Background Art

[0002] In the related art, the horizontal waste heat boiler superheater mostly adopts a vertical serpentine tube structure. When the boiler is started, the water used for the hydraulic pressure test in the vertical serpentine tube cannot be discharged naturally, and needs to be heated and evaporated by the flue gas generated during the start-up process. The heat exchange coefficient between the flue gas outside the waste heat boiler superheater tube and the working medium inside the tube is low, which makes the process of evaporating the water in the superheater into steam long. In addition, the waste heat of the flue gas that should be used to generate steam for production is used to evaporate the water for the hydraulic pressure test in the superheater. Especially for waste heat boilers from waste incineration, in order to control pollutant emissions, oil needs to be added during the start-up period to maintain the flue gas temperature in the furnace. The increase in the start-up time causes an increase in the amount of oil added to the boiler, resulting in energy waste. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the utility model provides a waste heat boiler.

[0004] The waste heat boiler of the utility model embodiment includes:

[0005] A flue, the flue being used to discharge flue gas generated by the waste heat boiler;

[0006] A boiler drum, which is used to discharge steam generated by the waste heat boiler;

[0007] A vertical serpentine tube superheater, the vertical serpentine tube superheater is located in the flue, the vertical serpentine tube superheater is used to absorb the heat of the flue gas in the flue, the inlet of the vertical serpentine tube superheater is connected with the outlet of the boiler drum through a first pipeline, and the steam in the boiler drum can be passed into the vertical serpentine tube superheater;

[0008] An exhaust pipe, the inlet of which is connected to the outlet of the vertical serpentine tube superheater, and the steam in the vertical serpentine tube superheater can flow into the exhaust pipe;

[0009] The heat exchanger has an inlet for introducing hot water for exchange, and the heat exchanger can absorb the heat of the flue gas generated by the waste heat boiler to heat the hot water for exchange into steam. The outlet of the heat exchanger is connected to the inlet of the vertical serpentine tube superheater.

[0010] Therefore, the waste heat boiler according to the embodiment of the utility model has the advantage of being able to increase the evaporation rate of water in the vertical serpentine tube superheater so as to reduce the furnace start-up time.

[0011] In some embodiments, the heat exchanger has a heat source chamber and a cold source chamber. The flue gas generated by the waste heat boiler can be passed into the heat source chamber, and hot water can be passed into the cold source chamber. The hot water in the cold source chamber can absorb the heat of the flue gas in the heat source chamber so as to heat the hot water into steam.

[0012] In some embodiments, at least part of the heat source chamber of the heat exchanger is located in the flue, and the inlet and outlet of the heat source chamber are both connected to the flue, and the heat exchanger can use the heat of the flue gas in the flue to heat the hot water in the cold source chamber.

[0013] In some embodiments, the waste heat boiler is provided with a first flue gas pipeline for exhausting flue gas;

[0014] The heat exchanger is located outside the flue, and the inlet of the heat source chamber of the heat exchanger is connected to the first flue gas pipeline. The heat exchanger can use the heat of the flue gas in the first flue gas pipeline to heat the water for water exchange in the cold source chamber.

[0015] In some embodiments, the outlet of the heat source chamber of the heat exchanger is connected to the flue through a second flue gas pipeline.

[0016] The waste heat boiler of the utility model embodiment comprises

[0017] A water inlet pipe, wherein a first pump body is provided on the water inlet pipe;

[0018] A second pipeline, through which the water inlet pipe is connected to the inlet of the cold source chamber of the heat exchanger;

[0019] A third pipeline, through which the outlet of the cold source chamber of the heat exchanger is connected to the inlet of the vertical serpentine tube superheater;

[0020] A fourth pipeline, the outlet of the vertical serpentine tube superheater is connected to the exhaust pipe through the fourth pipeline.

[0021] In some embodiments, a first one-way valve is provided on the first pipeline;

[0022] The third pipeline is provided with a second one-way valve, the third pipeline is provided with a first opening and closing valve, and the outlet of the third pipeline is connected with the outlet of the first pipeline and the inlet of the vertical serpentine tube superheater through a first three-way valve;

[0023] The outlet of the fourth pipeline is connected to the outlet of the water inlet pipe and the inlet of the second pipeline through a second three-way valve. A third one-way valve and a second on-off valve are provided on the fourth pipeline. The third one-way valve and the second on-off valve are located on the fourth pipeline between the exhaust pipe and the outlet of the vertical serpentine tube superheater.

[0024] In some embodiments, a monitoring device is provided on the fourth pipeline, and the monitoring device is used to monitor the data of steam discharged from the vertical serpentine tube superheater.

[0025] In some embodiments, the monitoring device includes an on-site pressure gauge, a remote pressure gauge, an on-site thermometer, and a remote thermometer.

[0026] In some embodiments, the heat exchanger is a pulsating heat pipe heat exchanger, which includes a shell, a partition and a pulsating heat pipe, wherein the partition is located in the shell and divides the cavity in the shell into the heat source cavity and the cold source cavity, the pulsating heat pipe is located in the shell, the heating section of the pulsating heat pipe is located in the heat source cavity, the pulsating heat pipe is fixed on the partition, the insulating section of the pulsating heat pipe is located in the partition, and the cooling section of the pulsating heat pipe is located in the cold source cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a waste heat boiler according to the first embodiment of the utility model.

[0028] Figure 2 It is a schematic diagram of a waste heat boiler according to the second embodiment of the utility model.

[0029] Reference numerals:

[0030] 1. flue, 11. first flue gas pipeline, 12. second flue gas pipeline;

[0031] 2. Boiler drum;

[0032] 3. Vertical serpentine tube superheater;

[0033] 4. Exhaust pipe;

[0034] 5. heat exchanger, 51. heat source cavity, 52. cold source cavity, 53. shell, 54. partition, 55. pulsating heat pipe;

[0035] 6. Water inlet pipe, 61. First pipeline, 62. Second pipeline, 63. Third pipeline, 64. Fourth pipeline, 65. First non-return valve, 66. Second non-return valve, 67. First on-off valve, 68. First three-way valve, 69. Second three-way valve, 70. Second on-off valve, 71. Local thermometer, 72. Local pressure gauge, 73. Remote thermometer, 74. Remote pressure gauge, 75. First pump body, 76. Third non-return valve. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0037] The waste heat boiler of the utility model embodiment is described below with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, the waste heat boiler according to the embodiment of the utility model includes a flue 1, a boiler drum 2, a vertical serpentine tube superheater 3, an exhaust pipe 4 and a heat exchanger 5.

[0038] The flue 1 is used to discharge the flue gas generated by the waste heat boiler. The boiler drum 2 is used to discharge the steam generated by the waste heat boiler.

[0039] The vertical serpentine tube superheater 3 is located in the flue 1, and is used to absorb the heat of the flue gas in the flue 1. The inlet of the vertical serpentine tube superheater 3 is connected with the outlet of the drum 2 through the first pipeline 61, and the steam in the drum 2 can be passed into the vertical serpentine tube superheater 3. That is, the steam in the drum 2 can be passed into the vertical serpentine tube superheater 3 through the first pipeline 61, so that the steam can be heated by absorbing the heat of the flue gas in the flue 1.

[0040] The inlet of the exhaust pipe 4 is communicated with the outlet of the vertical serpentine tube superheater 3, and the steam in the vertical serpentine tube superheater 3 can be passed into the exhaust pipe 4. The steam heated in the vertical serpentine tube superheater 3 can be discharged through the exhaust pipe 4.

[0041] The inlet of the heat exchanger 5 is used to pass the exchange water. The heat exchanger 5 can absorb the heat of the flue gas generated by the waste heat boiler so as to heat the exchange water into steam. The outlet of the heat exchanger 5 is connected with the inlet of the vertical serpentine tube superheater 3. Therefore, when the waste heat boiler is started, the steam discharged from the heat exchanger 5 can be passed into the vertical serpentine tube superheater 3, so that the steam in the heat exchanger 5 can enter the vertical serpentine tube superheater 3, so that the steam can be mixed with the water in the vertical serpentine tube superheater 3 to heat the water in the vertical serpentine tube superheater 3, so as to increase the evaporation rate of the water in the vertical serpentine tube superheater 3, so as to increase the evaporation rate of the water in the vertical serpentine tube superheater 3, thereby reducing the start-up time.

[0042] Therefore, the waste heat boiler according to the embodiment of the utility model has the advantage of being able to increase the evaporation rate of water in the vertical serpentine tube superheater 3 so as to reduce the furnace start-up time.

[0043] like Figure 1 and Figure 2As shown, in some embodiments, the heat exchanger 5 has a heat source chamber 51 and a cold source chamber 52. The flue gas generated by the waste heat boiler can be passed into the heat source chamber 51, and hot water can be passed into the cold source chamber 52. The hot water in the cold source chamber 52 can absorb the heat of the flue gas in the heat source chamber 51 so as to heat the hot water into steam.

[0044] like Figure 1 and Figure 2 As shown, in some embodiments, the heat exchanger 5 is a pulsating heat pipe heat exchanger, which includes a shell 53 , a partition 54 and a pulsating heat pipe 55 .

[0045] The partition 54 is located in the shell 53 and divides the cavity in the shell 53 into a heat source cavity 51 and a cold source cavity 52. ​​The pulsating heat pipe 55 is located in the shell 53. The heating section of the pulsating heat pipe 55 is located in the heat source cavity 51. The pulsating heat pipe 55 is fixed on the partition 54. The insulation section of the pulsating heat pipe 55 is located in the partition 54. The cooling section of the pulsating heat pipe 55 is located in the cold source cavity 52. ​​In this way, the flue gas can be passed into the heat source cavity 51, and the heating section of the pulsating heat pipe 55 exchanges heat with the flue gas, forming an air plug inside, and the cooling section of the pulsating heat pipe 55 exchanges heat with the hot water, forming a liquid plug inside; under the action of the pressure difference, a strong reciprocating oscillation motion is generated in the pulsating heat pipe 55 to achieve efficient heat transfer. For example, the hot water is deionized water (deionized water).

[0046] The pulsating heat pipe heat exchanger is a highly efficient phase change heat transfer element. Under the same temperature difference, the fluid in the pulsating heat pipe 55 transfers heat in a phase change manner. Therefore, by applying the pulsating heat pipe technology to the boiler system, it is possible to use a smaller heat exchange device to provide heating steam that meets the requirements of accelerated startup, accelerate the startup process of the boiler, and save energy; in addition, the equipment occupies a small area, has flexible layout, is easy to install, and has a fast response speed.

[0047] like Figure 1 As shown, in some embodiments, at least part of the heat source chamber 51 of the heat exchanger 5 is located in the flue 1, and the inlet and outlet of the heat source chamber 51 are both connected to the flue 1. The heat exchanger 5 can use the heat of the flue gas in the flue 1 to heat the hot water in the cold source chamber 52. Specifically, in the flow direction of the flue gas in the flue 1, the heat exchanger 5 is located upstream of the vertical serpentine tube superheater 3. The lower part (heat source chamber 51) of the pulsating heat pipe heat exchanger is located in the flue 1, and the inlet and outlet of the heat source chamber 51 are opened on both sides of the shell 53 in the extension direction of the flue 1, and the inlet of the heat source chamber 51 is facing away from the outlet of the flue 1. For example, the lower side of the partition 54 is filled with thermal insulation filler. The flue 1 is provided with plugs that can be clamped on both sides of the heat exchanger 5.

[0048] like Figure 1As shown, in some embodiments, the waste heat boiler is provided with a first flue gas pipeline 11 for exhausting flue gas. The heat exchanger 5 is located outside the flue 1, and the inlet of the heat source chamber 51 of the heat exchanger 5 is connected to the first flue gas pipeline 11. The heat exchanger 5 can use the heat of the flue gas in the first flue gas pipeline 11 to heat the hot water in the cold source chamber 52. The outlet of the heat source chamber 51 of the heat exchanger 5 is connected to the flue 1 through the second flue gas pipeline 12. Thus, the flue gas can pass from the first flue gas pipeline 11 into the heat source chamber 51, and then pass into the flue 1 from the second flue gas pipeline 12.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the waste heat boiler includes a water inlet pipe 6 , a second pipeline 62 , a third pipeline 63 and a fourth pipeline 64 .

[0050] The water inlet pipe 6 is provided with a first pump body 75, and the water inlet pipe 6 is connected to the inlet of the cold source chamber 52 of the heat exchanger 5 through the second pipeline 62. The outlet of the cold source chamber 52 of the heat exchanger 5 is connected to the inlet of the vertical serpentine tube superheater 3 through the third pipeline 63. The outlet of the vertical serpentine tube superheater 3 is connected to the exhaust pipe 4 through the fourth pipeline 64. Thus, the exchange water (130°C demineralized water) can be sequentially passed from the water inlet pipe 6 and the second pipeline 62 into the cold source chamber 52 of the heat exchanger 5, and after being heated into steam in the cold source chamber 52 of the heat exchanger 5, it is passed into the vertical serpentine tube superheater 3 through the third pipeline 63, and the steam discharged from the vertical serpentine tube superheater 3 can be passed into the exhaust pipe 4 from the fourth pipeline 64.

[0051] like Figure 1 and Figure 2 As shown, in some embodiments, a first one-way valve 65 is provided on the first pipeline 61 .

[0052] A second one-way valve 66 is provided on the third pipeline 63, a first on-off valve 67 is provided on the third pipeline 63, and the outlet of the third pipeline 63 is connected to the outlet of the first pipeline 61 and the inlet of the vertical serpentine tube superheater 3 through the first three-way valve 68. Thus, the communication of the third pipeline 63 can be controlled by controlling the opening and closing of the first on-off valve 67. For example, the first three-way valve 68 is an electric valve.

[0053] The outlet of the fourth pipeline 64 is connected to the outlet of the water inlet pipe 6 and the inlet of the second pipeline 62 through the second three-way valve 69. The fourth pipeline 64 is provided with a third one-way valve 76 and a second opening and closing valve 70. The third one-way valve 76 and the second opening and closing valve 70 are located between the exhaust pipe 4 and the outlet of the vertical serpentine tube superheater 3 on the fourth pipeline 64. Thus, the steam discharged from the fourth pipeline 64 can be passed into the cold source chamber 52 of the heat exchanger 5 again through the second pipeline 62. For example, the second three-way valve 69 is an electric valve.

[0054] like Figure 1 and Figure 2As shown, in some embodiments, a monitoring device is provided on the fourth pipeline 64, and the monitoring device is used to monitor the data of the steam discharged from the vertical serpentine tube superheater 3. Specifically, the monitoring device includes a local pressure gauge 72, a remote pressure gauge 74, a local thermometer 71 and a remote thermometer 73. The local pressure gauge 72 and the remote pressure gauge 74 can monitor the steam pressure discharged from the vertical serpentine tube superheater 3 through the fourth pipeline 64, and the local thermometer 71 and the remote thermometer 73 can monitor the steam temperature discharged from the vertical serpentine tube superheater 3 through the fourth pipeline 64. It is used to judge the medium state at the outlet of the vertical serpentine tube superheater 3. If it reaches saturation or overheating, it can be judged that the water in the vertical serpentine tube superheater 3 begins to be converted into steam or has been completely converted into steam, and the heat exchanger 5 can be closed at this time.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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 invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A waste heat boiler, characterized in that: include: A flue, the flue being used to discharge flue gas generated by the waste heat boiler; A boiler drum, which is used to discharge steam generated by the waste heat boiler; A vertical serpentine tube superheater, the vertical serpentine tube superheater is located in the flue, the vertical serpentine tube superheater is used to absorb the heat of the flue gas in the flue, the inlet of the vertical serpentine tube superheater is connected with the outlet of the boiler drum through a first pipeline, and the steam in the boiler drum can be passed into the vertical serpentine tube superheater; An exhaust pipe, the inlet of which is connected to the outlet of the vertical serpentine tube superheater, and the steam in the vertical serpentine tube superheater can flow into the exhaust pipe; The heat exchanger has an inlet for introducing hot water for exchange, and the heat exchanger can absorb the heat of the flue gas generated by the waste heat boiler to heat the hot water for exchange into steam. The outlet of the heat exchanger is connected to the inlet of the vertical serpentine tube superheater.

2. The waste heat boiler according to claim 1, characterized in that: The heat exchanger has a heat source cavity and a cold source cavity. The flue gas generated by the waste heat boiler can flow into the heat source cavity, and the hot water can flow into the cold source cavity. The hot water in the cold source cavity can absorb the heat of the flue gas in the heat source cavity so as to heat the hot water into steam.

3. The waste heat boiler according to claim 2, characterized in that: At least part of the heat source chamber of the heat exchanger is located in the flue, and the inlet and outlet of the heat source chamber are both connected to the flue. The heat exchanger can use the heat of the flue gas in the flue to heat the hot water in the cold source chamber.

4. The waste heat boiler according to claim 2, characterized in that: The waste heat boiler is provided with a first flue gas pipeline for exhausting flue gas; The heat exchanger is located outside the flue, and the inlet of the heat source chamber of the heat exchanger is connected to the first flue gas pipeline. The heat exchanger can use the heat of the flue gas in the first flue gas pipeline to heat the water for water exchange in the cold source chamber.

5. The waste heat boiler according to claim 4, characterized in that: The outlet of the heat source chamber of the heat exchanger is connected to the flue through a second flue gas pipeline.

6. The waste heat boiler according to claim 2, characterized in that: include A water inlet pipe, wherein a first pump body is provided on the water inlet pipe; A second pipeline, through which the water inlet pipe is connected to the inlet of the cold source chamber of the heat exchanger; A third pipeline, through which the outlet of the cold source chamber of the heat exchanger is connected to the inlet of the vertical serpentine tube superheater; A fourth pipeline, the outlet of the vertical serpentine tube superheater is connected to the exhaust pipe through the fourth pipeline.

7. The waste heat boiler according to claim 6, characterized in that: A first one-way valve is provided on the first pipeline; The third pipeline is provided with a second one-way valve, the third pipeline is provided with a first opening and closing valve, and the outlet of the third pipeline is connected with the outlet of the first pipeline and the inlet of the vertical serpentine tube superheater through a first three-way valve; The outlet of the fourth pipeline is connected to the outlet of the water inlet pipe and the inlet of the second pipeline through a second three-way valve. A third one-way valve and a second on-off valve are provided on the fourth pipeline. The third one-way valve and the second on-off valve are located on the fourth pipeline between the exhaust pipe and the outlet of the vertical serpentine tube superheater.

8. The waste heat boiler according to claim 6, characterized in that: The fourth pipeline is provided with a monitoring device, and the monitoring device is used to monitor the data of the steam discharged from the vertical serpentine tube superheater.

9. The waste heat boiler according to claim 8, characterized in that: The monitoring device comprises a local pressure gauge, a remote pressure gauge, a local thermometer and a remote thermometer.

10. The waste heat boiler according to any one of claims 2 to 9, characterized in that: The heat exchanger is a pulsating heat pipe heat exchanger, which includes a shell, a partition and a pulsating heat pipe. The partition is located in the shell and divides the cavity in the shell into the heat source cavity and the cold source cavity. The pulsating heat pipe is located in the shell, the heating section of the pulsating heat pipe is located in the heat source cavity, the pulsating heat pipe is fixed on the partition, the insulation section of the pulsating heat pipe is located in the partition, and the cooling section of the pulsating heat pipe is located in the cold source cavity.

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