Waste heat boiler tail gas recycling device

Abstract

The utility model provides a waste heat boiler tail gas recycling device, and relates to the technical field of boiler tail gas treatment. The waste heat boiler tail gas recycling device comprises a waste heat boiler, a preheater and a pre-cooling tank, the waste heat boiler is connected with the preheater through a steam pipeline, the preheater is connected with the pre-cooling tank through a first condensate water pipeline, the pre-cooling tank is connected with the waste heat boiler through a second condensate water pipeline, and the waste heat boiler is connected with the pre-cooling tank through a steam pipeline. The waste heat boiler is further connected with a tail gas inlet pipe and a first tail gas outlet pipe, the other end of the first tail gas outlet pipe is connected with the pre-cooling tank, the pre-cooling tank is further connected with a second tail gas outlet pipe, and a filter is arranged between the first tail gas outlet pipe and the pre-cooling tank. The waste heat recovery rate can be increased, and the steam generation amount is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler tail gas treatment, in particular to a waste heat boiler tail gas recovery and utilization device. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The exhaust gas discharged by the steam boiler has a very high temperature, but the high-temperature steam is generally discharged directly through a fan. A large part of the heat energy is lost with the exhaust gas from the boiler, resulting in energy waste.

[0003] In the currently used charcoal furnace (activated carbon regeneration furnace), the exhaust gas passes through the fan, comes out of the furnace, passes through the after-combustion chamber → waste heat boiler → pre-cooling tank → scrubber, and the exhaust gas temperature after passing through the after-combustion chamber is 450-500°C. The exhaust gas waste heat cannot be recovered through the above treatment, resulting in a low waste heat recovery rate and waste of energy. Utility Model Content

[0004] The utility model aims to provide a waste heat boiler tail gas recovery and utilization device, which can improve the waste heat recovery rate and increase the steam generation amount.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A waste heat boiler exhaust gas recovery and utilization device comprises a waste heat boiler, a preheater and a precooling tank, the waste heat boiler is connected to the preheater through a steam pipe, the preheater is connected to the precooling tank through a first condensed water pipe, the precooling tank is connected to the waste heat boiler through a second condensed water pipe, the waste heat boiler is also connected to an exhaust gas inlet pipe and a first exhaust gas outlet pipe, the other end of the first exhaust gas outlet pipe is connected to the precooling tank, the precooling tank is also connected to a second exhaust gas outlet pipe, and a filter is arranged between the first exhaust gas outlet pipe and the precooling tank.

[0007] Furthermore, the filter comprises a box body, in which a first filter layer and a second filter layer are sequentially arranged along the exhaust gas flow direction of the first exhaust gas outlet pipe, and a slag cleaning piece is arranged at the bottom of the first filter layer.

[0008] Furthermore, the first filter layer is a filter mesh layer, and the second filter layer is an activated carbon layer.

[0009] Furthermore, the slag cleaning part includes a connecting plate and a slag cleaning column. A connecting rod is provided on one side of the connecting plate facing the inner wall of the box body. The other end of the connecting rod extends outside the box body and is connected to a cylinder. A plurality of slag cleaning columns are arranged in an array on the top of the connecting plate.

[0010] Furthermore, a funnel-shaped exhaust gas diverter is provided at the bottom of the box body, an exhaust gas inlet is provided at the bottom of the exhaust gas diverter, a plurality of exhaust holes are opened at the top of the exhaust gas diverter, and a plurality of diverter plates are provided inside the exhaust gas diverter.

[0011] Furthermore, a dust sweeping part is provided in the box, which includes a screw, a movable rod and bristles. One end of the screw is rotatably connected to the inner wall of the box, and the other end of the screw passes through the box and is connected to the output end of the motor. The movable rod is threadedly connected to the screw, and a number of bristles are installed at the bottom of the movable rod, which are used to clean the exhaust gas diverter.

[0012] Furthermore, a baffle with an annular cross section is provided on the inner bottom surface of the box body, and an ash outlet is provided at the bottom of the box body. The top end of the baffle contacts the top edge of the exhaust gas diverter, and the bottom end of the baffle extends to the ash outlet.

[0013] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0014] In the utility model, the tail gas of the working boiler is introduced into the waste heat boiler, and the high-temperature tail gas is used to heat the boiler inlet water of the waste heat boiler to generate high-pressure steam. The high-pressure steam flows out of the waste heat boiler and is transported to the preheater through the steam pipeline. Cold water is introduced into the preheater, and the water in the preheater is heated by the high-pressure steam. The heated water is transported to the precooling tank through the first condensed water pipeline, and then flows out from the outlet of the precooling tank and is transported to the waste heat boiler through the second condensed water pipeline, thereby realizing the preheating of the boiler inlet water, so that the recycling device can form a closed loop, which can improve the waste heat recovery rate, accelerate the steam generation speed, and increase the steam generation amount. The waste heat boiler is connected to the precooling tank through the first tail gas outlet pipe, so that the tail gas generated by the waste heat boiler can be used to heat the water in the precooling tank, realize the secondary preheating of the boiler inlet water, further improve the waste heat recovery rate, and then the tail gas after passing through the precooling tank is discharged from the second tail gas outlet pipe. A filter is arranged between the first tail gas outlet pipe and the precooling tank. The tail gas generated by the waste heat boiler is purified and filtered by the filter, which can reduce impurities in the tail gas, avoid air pollution caused by tail gas emissions, and be more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a waste heat boiler tail gas recovery and utilization device provided in Example 1 of the utility model;

[0017] Figure 2 A schematic diagram of the internal structure of the filter provided in Example 1 of the utility model;

[0018] Figure 3 Provided for the utility model embodiment 1 Figure 2 A partial enlarged view of the middle A;

[0019] Figure 4 This is a cross-sectional view of the exhaust gas diverter provided in Example 1 of the utility model.

[0020] Icons: 1-waste heat boiler, 2-preheater, 3-precooling tank, 4-exhaust inlet pipe, 5-steam pipe, 6-first condensate pipe, 7-second condensate pipe, 8-first exhaust outlet pipe, 9-second exhaust outlet pipe, 10-filter, 101-box, 102-first filter layer, 103-second filter layer, 104-slag cleaning parts, 105-exhaust diverter, 106-screw, 107-motor, 108-movable rod, 109-brush, 110-baffle, 111-ash outlet, 112-cylinder, 1041-connecting plate, 1042-slag cleaning column, 1043-connecting rod, 1051-exhaust inlet, 1052-air outlet, 1053-diverter plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does 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 cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figure 1-4 As shown, this embodiment provides a waste heat boiler exhaust gas recovery and utilization device, including a waste heat boiler 1, a preheater 2 and a precooling tank 3, the waste heat boiler 4 is connected to the preheater 2 through a steam pipe 5, the preheater 2 is connected to the precooling tank 3 through a first condensate water pipe 6, the precooling tank 3 is connected to the waste heat boiler 1 through a second condensate water pipe 7, the waste heat boiler 1 is also connected to an exhaust gas inlet pipe 4 and a first exhaust gas outlet pipe 8, the other end of the first exhaust gas outlet pipe 8 is connected to the precooling tank 3, the precooling tank 3 is also connected to a second exhaust gas outlet pipe 9, and a filter 10 is arranged between the first exhaust gas outlet pipe 8 and the precooling tank 3.

[0028] The tail gas of the working boiler is introduced into the waste heat boiler 1 through the tail gas inlet pipe 4, and the high-temperature tail gas is used to heat the boiler inlet water of the waste heat boiler 1 to generate high-pressure steam. The high-pressure steam flows out of the waste heat boiler 1 and is transported to the preheater 2 through the steam pipe 5. Cold water is introduced into the preheater 2, and the water in the preheater 2 is heated by the high-pressure steam. The heated water is transported to the precooling tank 3 through the first condensed water pipe 6, and then flows out from the outlet of the precooling tank 3 and is transported to the waste heat boiler 1 through the second condensed water pipe 7, thereby realizing the preheating of the boiler inlet water, so that the recycling device can form a closed loop, which can improve the waste heat recovery rate, accelerate the steam generation speed, and increase the steam generation amount. The waste heat boiler 1 is connected with the precooling tank 3 through the first tail gas outlet pipe 8, so that the tail gas generated by the waste heat boiler 1 can be used to heat the water in the precooling tank 3, realize the secondary preheating of the boiler inlet water, and further improve the waste heat recovery rate, and then the tail gas after passing through the precooling tank 3 is discharged from the second tail gas outlet pipe 9. A filter 10 is arranged between the first tail gas outlet pipe 8 and the precooling tank 3. The tail gas generated by the waste heat boiler 1 is purified and filtered by the filter 10, which can reduce impurities in the tail gas, avoid air pollution caused by tail gas emissions, and be more environmentally friendly. Among them, the preheater 2 can be a shell and tube heat exchanger.

[0029] In this embodiment, the filter 10 includes a housing 101, in which a first filter layer 102 and a second filter layer 103 are sequentially arranged along the exhaust gas flow direction of the first exhaust gas outlet pipe 8, and a slag removal member 104 is arranged at the bottom of the first filter layer 102. By filtering the exhaust gas of the waste heat boiler 1 twice through the first filter layer 102 and the second filter layer 103, impurities in the exhaust gas can be significantly reduced and the exhaust gas purification effect can be improved. By using the slag removal member 104 to perform slag removal treatment on the first filter layer 102, the filtering effect of the first filter layer 102 can be ensured and the service life of the first filter layer 102 can be extended.

[0030] In this embodiment, the first filter layer 102 is a filter layer, and the second filter layer 103 is an activated carbon layer. The exhaust gas is first filtered through the filter to remove particulate matter and dust in the exhaust gas, and then the exhaust gas is secondarily purified and adsorbed by the activated carbon to further remove impurities in the exhaust gas, thereby improving the exhaust gas purification effect and preventing the exhaust gas from polluting the air.

[0031] In this embodiment, the slag cleaning member 104 includes a connecting plate 1041 and a slag cleaning column 1042. A connecting rod 1043 is provided on one side of the connecting plate 1041 facing the inner side wall of the box body 101. The other end of the connecting rod 1043 extends to the outside of the box body 101 and is connected to a cylinder 112. A plurality of slag cleaning columns 1042 are arranged in an array on the top of the connecting plate 1041. The cylinder 112 is installed on the outer side wall of the box body 101. The connecting rod 1043 is driven to move in the horizontal direction by the cylinder 112, and the connecting rod 1043 drives the connecting plate 1041 to move in the horizontal direction. The connecting plate 1041 drives the slag cleaning column 1042 to move at the bottom of the first filter layer 102, so that the slag cleaning column 1042 performs slag cleaning on the first filter layer 102. The slag cleaning column 1042 is a rubber column, and the slag cleaning column 1042 abuts against the first filter layer 102.

[0032] In this embodiment, a funnel-shaped tail gas diverter 105 is provided at the bottom of the box 101, a tail gas inlet 1051 is provided at the bottom of the tail gas diverter 105, a plurality of air outlet holes 1052 are provided at the top of the tail gas diverter 105, and a plurality of diverter plates 1053 are provided inside the tail gas diverter 104. The tail gas generated by the waste heat boiler 1 enters the box 101 through a pipeline, and the tail gas is diverted by the tail gas diverter 105, so that the tail gas can flow out along the plurality of air outlet holes 1052 on the tail gas diverter 105, so that the tail gas can pass through the first filter layer 102 evenly, avoiding the tail gas passing only from the middle of the first filter layer 102, and improving the filtering effect of the first filter layer 102 on the tail gas.

[0033] In this embodiment, a dust sweeping member is also provided in the box 1014, and the dust sweeping member includes a screw 106, a movable rod 108 and bristles 109, one end of the screw 106 is rotatably connected to the inner wall of the box 101, the other end of the screw 106 penetrates the box 101 and is connected to the output end of the motor 107, the movable rod 108 is threadedly connected to the screw 106, and a plurality of bristles 109 are installed at the bottom of the movable rod 108, and the bristles 109 are used to clean the exhaust gas diverter 105. Among them, the motor 107 is installed on the outer wall of the box 101. The screw 106 is driven to rotate by the motor 107, and the rotation of the screw 106 drives the movable rod 108 to move in the length direction of the screw 106. The movable rod 108 drives the bristles 109 to move horizontally, and the top of the exhaust gas diverter 105 is cleaned by the bristles 109. This can avoid blockage of the air outlet 1052 and ensure the uniformity of the exhaust gas diversion. At the same time, the dust swept from the first filter layer 102 by the slag cleaning piece 104 can be swept off the exhaust gas diverter 105, and then cleaned out from the ash outlet 111 at the bottom of the box body 101, so as to facilitate the cleaning of the box body 101.

[0034] In this embodiment, a baffle 110 with an annular cross section is provided on the inner bottom surface of the box body 101, and an ash outlet 111 is provided at the bottom of the box body 101. The top of the baffle 110 contacts the top edge of the tail gas diverter 102, and the bottom of the baffle 110 extends to the ash outlet 111. By providing the baffle 110, dust can be prevented from falling below the tail gas diverter 105, and the dust is allowed to fall to the ash outlet 111, thereby improving the convenience of cleaning the dust.

[0035] The working principle of a waste heat boiler tail gas recovery and utilization device is as follows: the high-temperature tail gas of the working boiler is introduced into the waste heat boiler 1 through the tail gas inlet pipe 4, and the high-temperature tail gas heats the boiler inlet water of the waste heat boiler 1 to generate high-pressure steam. The high-pressure steam flowing out of the waste heat boiler 1 is transported to the preheater 2 through the steam pipe 5, and cold water is introduced into the preheater 2 at the same time, and the water in the preheater 2 is heated by the high-pressure steam. The heated water is transported to the precooling tank 3 through the first condensed water pipe 6, and then flows out from the outlet of the precooling tank 3 and is transported to the waste heat boiler 1 through the second condensed water pipe 7, thereby realizing the preheating of the boiler inlet water. At the same time, the tail gas generated by the waste heat boiler 1 is transported to the filter 10 through the pipeline, and the tail gas is filtered and purified by the filter 10, and then transported to the precooling tank 3 through the first tail gas outlet pipe 8, and the water in the precooling tank 3 is heated to realize the secondary preheating of the boiler inlet water, and finally the tail gas after passing through the precooling tank 3 is discharged from the second tail gas outlet pipe 9.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A waste heat boiler tail gas recovery and utilization device, characterized in that: It includes a waste heat boiler, a preheater and a precooling tank, the waste heat boiler is connected to the preheater through a steam pipe, the preheater is connected to the precooling tank through a first condensate water pipe, the precooling tank is connected to the waste heat boiler through a second condensate water pipe, the waste heat boiler is also connected to a tail gas inlet pipe and a first tail gas outlet pipe, the other end of the first tail gas outlet pipe is connected to the precooling tank, the precooling tank is also connected to a second tail gas outlet pipe, and a filter is arranged between the first tail gas outlet pipe and the precooling tank.

2. The waste heat boiler tail gas recovery and utilization device according to claim 1 is characterized in that: The filter comprises a box body, in which a first filter layer and a second filter layer are sequentially arranged along the exhaust gas flow direction of the first exhaust gas outlet pipe, and a slag cleaning piece is arranged at the bottom of the first filter layer.

3. The waste heat boiler tail gas recovery and utilization device according to claim 2 is characterized in that: The first filter layer is a filter mesh layer, and the second filter layer is an activated carbon layer.

4. The waste heat boiler tail gas recovery and utilization device according to claim 2 is characterized in that: The slag cleaning part includes a connecting plate and a slag cleaning column. A connecting rod is arranged on one side of the connecting plate facing the inner wall of the box body. The other end of the connecting rod extends outside the box body and is connected to a cylinder. A plurality of slag cleaning columns are arranged in an array on the top of the connecting plate.

5. The waste heat boiler tail gas recovery and utilization device according to claim 2 is characterized in that: A funnel-shaped tail gas diverter is arranged at the bottom of the box body, a tail gas inlet is arranged at the bottom of the tail gas diverter, a plurality of air outlet holes are opened at the top of the tail gas diverter, and a plurality of diverter plates are arranged inside the tail gas diverter.

6. The waste heat boiler tail gas recovery and utilization device according to claim 5 is characterized in that: A dust sweeping piece is also provided in the box body, and the dust sweeping piece includes a screw, a movable rod and bristles. One end of the screw is rotatably connected to the inner wall of the box body, and the other end of the screw passes through the box body and is connected to the output end of the motor. The movable rod is threadedly connected to the screw, and a plurality of bristles are installed at the bottom of the movable rod, and the bristles are used to clean the exhaust gas diverter.

7. The waste heat boiler tail gas recovery and utilization device according to claim 6 is characterized in that: The inner bottom surface of the box body is provided with a baffle with an annular cross section, and the bottom of the box body is provided with an ash outlet. The top end of the baffle contacts the top edge of the exhaust gas diverter, and the bottom end of the baffle extends to the ash outlet.

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