Waste heat recycling device of circulating fluidized bed boiler for preparing carbon dioxide adsorbent

Abstract

The invention relates to a waste heat recycling device of a circulating fluidized bed boiler for preparing a carbon dioxide adsorbent, belongs to the field of waste heat recycling devices, and can solve the problems that in the background technology, the existing waste heat treatment modes are divided into two modes, one mode is direct emission, resource waste is caused, and the environment is polluted. And in the other mode, waste heat is recycled, and a waste heat recycling equipment structure in the prior art cannot fully recycle heat and does not have a good filtering function.

Description

Technical Field

[0001] The present invention belongs to the field of devices for waste heat recovery, in particular to a waste heat recovery and utilization device for a circulating fluidized bed boiler used for preparing carbon dioxide adsorbent. Background Art

[0002] The preparation of carbon dioxide adsorbent can adsorb carbon dioxide, which can effectively reduce greenhouse gas emissions. Therefore, the preparation of carbon dioxide adsorbent has a positive promoting effect on the adsorption of carbon dioxide gas. A large amount of waste heat is generated during the production process of existing circulating fluidized bed boilers. Waste heat is redundant and wasted energy. This wasted energy can be used for the preparation of carbon dioxide adsorbent, thereby further reducing greenhouse gas emissions. The existing waste heat treatment methods are divided into two types. One is direct emission, which causes waste of resources and pollutes the environment. The other method is to recover and reuse waste heat. The structure of the waste heat recovery and reuse equipment in the prior art cannot fully recover and reuse heat, and does not have a good filtering function. Summary of the Invention

[0003] The purpose of the present invention is to provide a waste heat recovery and utilization device for a circulating fluidized bed boiler used for preparing carbon dioxide adsorbent to solve the above problems existing in the prior art.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A waste heat recovery and utilization device for a circulating fluidized bed boiler used for preparing carbon dioxide adsorbent includes: a heat exchange device, a filtering device, and a power generation device. The heat exchange device is fixedly communicated with the filtering device, and the filtering device is fixedly communicated with the power generation device.

[0006] The heat exchange device includes: a heat exchange box, an air inlet pipe, heat exchange tubes, and an induced draft fan. Heat exchange tubes are sequentially communicated at the upper end inside the heat exchange box, inside the air inlet pipe, and at the lower end inside the heat exchange box. The heat exchange tubes located at the upper end of the heat exchange box are fixedly communicated with the induced draft fan.

[0007] The heat exchange tubes provided at the upper end inside the heat exchange box, inside the air inlet pipe, and at the lower end inside the heat exchange box are all arranged in an S shape.

[0008] The filtering device includes: a water tank, a filter disc unit, a conical cover, an ash discharge cover, a blower, and a filter plate unit. The water tank is provided with a water inlet and exhaust port. The filter disc unit is fixed on the water tank. Conical covers are fixed on both sides above the filter disc unit. An ash discharge cover is provided on one side below the filter disc unit. A blower is fixedly communicated on the other side below the filter disc unit. The filter plate unit is rotatably and fittingly connected inside the filter disc unit. The ash discharge cover is fixedly penetrated into the water tank.

[0009] The filter disc unit includes: a filter disc, a first cavity, and through holes. A filter disc is fixed to the upper end of the water tank. A first cavity is provided inside the filter disc. Through holes are symmetrically arranged up and down on the filter disc. Conical covers are fixedly connected to both sides of the through hole located at the upper end. An ash discharge cover is fixedly connected to one side surface of the through hole located at the lower end. A blower is fixedly connected to the other side surface of the through hole located at the lower end.

[0010] The filter plate unit includes: a filter plate, a filter net, and a rotating shaft. The filter plate is provided with four filter nets. The four filter nets are arranged in a circumferential array. Sealing rings are provided on both sides of the four filter nets. A rotating shaft is provided in the middle of the filter plate. The filter plate fits and rotates inside the first cavity. The size of the filter net matches the size of the through hole. One end of the rotating shaft rotates inside a side wall of the first cavity, and the other side of the rotating shaft rotates out through the side surface of the filter disc.

[0011] The power generation device includes: a wind barrel, a second cavity, a spiral groove, a conical air hole, an output shaft, a vortex fan, a ventilation fan, and an air outlet pipe. A second cavity is provided inside the side wall of the wind barrel. One of the conical covers is fixedly connected to the second cavity. A spiral groove is continuously provided on the inner wall of the wind barrel. A plurality of conical air holes are evenly distributed at the bottom of the spiral groove. The conical air holes are communicated with the second cavity. One end of the output shaft rotates out through the side surface of the wind barrel, and the other end of the output shaft is rotatably connected to the inner wall of the wind barrel through a shaft bracket. A plurality of vortex fans are provided on the output shaft. A ventilation fan is fixed on the output shaft. An air outlet pipe is provided at the front end of the wind barrel. The ventilation fan is located at the rear end of the air outlet pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The present invention provides a device for recycling the waste heat of a circulating fluidized bed boiler for preparing a carbon dioxide adsorbent, which can solve the problems raised in the background technology: there are two existing waste heat treatment methods. One is direct discharge, which causes waste of resources and pollutes the environment, and the other is to recycle and reuse the waste heat. The waste heat recovery and reuse equipment structure in the prior art cannot fully recover and reuse the heat, and does not have a good filtering function.

[0014] This device can utilize the heat multiple times by setting heat exchange tubes and induced draft fans. At the same time, by setting a filtering device, impurities in the waste gas can be effectively filtered, and cleaning can be carried out without shutting down the machine. The filtered gas can be reused again through the power generation device. Realize multi-level utilization and fully recover and reuse the waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure;

[0016] Figure 2It is a schematic structural diagram of a filtering device;

[0017] Figure 3 It is a sectional view of a filter disc unit;

[0018] Figure 4 It is a schematic structural diagram of a filter plate unit;

[0019] Figure 5 It is a schematic structural diagram of a power generation device. Specific implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] A circulating fluidized bed boiler waste heat recovery and utilization device for preparing a carbon dioxide adsorbent includes: a heat exchange device 1, a filtering device 2, and a power generation device 3. The heat exchange device 1 is fixedly communicated with the filtering device 2, and the filtering device 2 is fixedly communicated with the power generation device 3.

[0022] The heat exchange device 1 includes: a heat exchange box 1-1, an air inlet pipe 1-2, heat exchange pipes 1-3, and an induced draft fan 1-4. Heat exchange pipes 1-3 are sequentially communicated at the upper end inside the heat exchange box 1-1, inside the air inlet pipe 1-2, and at the lower end inside the heat exchange box 1-1. The heat exchange pipes 1-3 located at the upper end of the heat exchange box 1-1 are fixedly communicated with the induced draft fan 1-4.

[0023] The heat exchange pipes 1-3 provided at the upper end inside the heat exchange box 1-1, inside the air inlet pipe 1-2, and at the lower end inside the heat exchange box 1-1 are all arranged in an S shape.

[0024] The filtering device 2 includes: a water tank 2-1, a filter disc unit 2-2, a conical cover 2-3, an ash discharge cover 2-4, a blower 2-5, and a filter plate unit 2-6. The water tank 2-1 is provided with a water inlet and exhaust port. The filter disc unit 2-2 is fixed on the water tank 2-1. Conical covers 2-3 are fixed on both sides above the filter disc unit 2-2. An ash discharge cover 2-4 is provided on one side below the filter disc unit 2-2. A blower 2-5 is fixedly communicated on the other side below the filter disc unit 2-2. The filter plate unit 2-6 is rotationally and fittingly connected inside the filter disc unit 2-2. The ash discharge cover 2-4 is fixedly inserted into the water tank 2-1.

[0025] The filter disc unit 2-2 includes: a filter disc 2-2-1, a first cavity 2-2-2, and through holes 2-2-3. A filter disc 2-2-1 is fixed to the upper end of the water tank 2-1. A first cavity 2-2-2 is arranged inside the filter disc 2-2-1. Through holes 2-2-3 penetrating through are symmetrically arranged up and down on the filter disc 2-2-1. Conical covers 2-3 are fixedly communicated with both sides of the through hole 2-2-3 located at the upper end. An ash discharge cover 2-4 is fixedly communicated with one side surface of the through hole 2-2-3 located at the lower end. A blower 2-5 is fixedly communicated with the other side surface of the through hole 2-2-3 located at the lower end.

[0026] The filter plate unit 2-6 includes: a filter plate 2-6-1, a filter net 2-6-2, and a rotating shaft 2-6-3. Four filter nets 2-6-2 are arranged on the filter plate 2-6-1. The four filter nets 2-6-2 are arranged in a circumferential array. Sealing rings are arranged on both sides of the four filter nets 2-6-2. A rotating shaft 2-6-3 is arranged in the middle of the filter plate 2-6-1. The filter plate 2-6-1 fits and rotates in the first cavity 2-2-2. The size of the filter net 2-6-2 matches the size of the through hole 2-2-3. One end of the rotating shaft 2-6-3 rotates in one side wall of the first cavity 2-2-2, and the other side of the rotating shaft 2-6-3 rotates out of the side surface of the filter disc 2-2-1.

[0027] The power generation device 3 includes: a wind barrel 3-1, a second cavity 3-2, a spiral groove 3-3, a conical air hole 3-4, an output shaft 3-5, a vortex fan 3-6, a ventilation fan 3-7, and an air outlet pipe 3-8. A second cavity 3-2 is arranged inside the side wall of the wind barrel 3-1. One of the conical covers 2-3 is fixedly communicated with the second cavity 3-2. A spiral groove 3-3 is continuously arranged on the inner wall of the wind barrel 3-1. A plurality of conical air holes 3-4 are uniformly arranged at the bottom of the spiral groove 3-3. The conical air holes 3-4 are communicated with the second cavity 3-2. One end of the output shaft 3-5 rotates out of the side surface of the wind barrel 3-1, and the other end of the output shaft 3-5 is rotationally connected to the inner wall of the wind barrel 3-1 through a shaft bracket. A plurality of vortex fans 3-6 are arranged on the output shaft 3-5. A ventilation fan 3-7 is fixed on the output shaft 3-5. An air outlet pipe 3-8 is arranged at the front end of the wind barrel 3-1. The ventilation fan 3-7 is located at the rear end of the air outlet pipe 3-8.

[0028] The working principle of the present invention is:

[0029] During use, the intake pipe 1-2 is fixedly connected to the air outlet end of the circulating fluidized bed boiler, and then water is injected into the heat exchange box 1-1. The input shaft and the output shaft 3-5 of the generator are fixedly connected to complete the connection of this device. This device is connected to an external power supply. The circulating fluidized bed boiler generates waste gas, which enters the intake pipe 1-2, and then enters the heat exchange tube 1-3 from the intake pipe 1-2. The waste heat can be used to heat the water in the heat exchange box 1-1. The heated water can be used for the preparation of carbon dioxide adsorbent. When the water is heated, the hot water will flow upward, so the water temperature at the upper end of the heat exchange box 1-1 is higher than that at the lower end. The waste gas dissipates heat in the heat exchange tube 1-3. When the waste gas reaches the lower end inside the heat exchange box 1-1 along the heat exchange tube 1-3, the temperature decreases, which will increase the water heating time. The induced draft fan 1-4 is powered on to guide the flow of the waste gas in the heat exchange tube 1-3, so that the waste gas re-enters the heat exchange tube 1-3 located in the intake pipe 1-2. The waste gas in the heat exchange tube 1-3 is reheated by the high-temperature waste gas newly entering the intake pipe 1-2, and then is sent back into the heat exchange tube 1-3 located at the lower end of the heat exchange box 1-1 to heat the water at the lower end of the heat exchange box 1-1 to complete the cycle. The heat exchange tube 1-3 arranged at the upper end inside the heat exchange box 1-1, inside the intake pipe 1-2, and at the lower end inside the heat exchange box 1-1 can be used to heat the water inside the heat exchange box 1-1 as a whole, shorten the heating time, and prevent the temperature of the waste gas from decreasing too quickly after entering the heat exchange tube 1-3, or prevent the waste gas from flowing out too quickly through the heat exchange tube 1-3 and having a short heat dissipation time, thus increasing the water heating time. After the water is heated, the waste gas in the heat exchange tube 1-3 is discharged through the conical cover 2-3, passes through the through hole 2-2-3, and is filtered by the filter screen 2-6-2 to remove impurities. Then, it is collected by the conical cover 2-3 at the other end and enters the cavity two 3-2. If impurities adhere to the filter screen 2-6-2 after long-term filtering of waste gas impurities, the filtering efficiency of the filter screen 2-6-2 will decrease. At this time, the rotating shaft 2-6-3 is rotated to drive the filter screen 2-6-2 to rotate through the filter plate 2-6-1, so that the previous filter screen 2-6-2 is separated from the through hole 2-2-3, and the latter filter screen 2-6-2 coincides with the through hole 2-2-3 to continue filtering, realizing cleaning without shutting down. When the used filter screen 2-6-2 coincides with the through hole 2-2-3 located at the lower end during the rotation of the filter plate 2-6-1, the blower 2-5 is powered on, and air can be blown back onto the filter screen 2-6-2 to blow off the impurities adhered to the filter screen 2-6-2 and enter the water tank 2-1 through the ash discharge cover 2-4. The water tank 2-1 is filled with water in advance so that the ash discharge cover 2-4 is located below the water surface. At this time, the air containing impurities discharged from the ash discharge cover 2-4 enters the water, and the impurities in the air remain in the water, and the gas is discharged through the water inlet and exhaust port, realizing the cleaning and reuse of the filter screen 2-6-2 and reducing environmental pollution. After the waste gas fills the cavity two 3-2, it is ejected through the conical air hole 3-4. The conical air hole 3-4 can increase the ejection flow rate of the waste gas.The exhaust gas jets impact on multiple vortex fans 3-6, driving the rotation of the vortex fans 3-6. The rotation of the vortex fans 3-6 drives the rotation of the output shaft 3-5, which in turn drives the rotation of the generator input shaft to generate electricity. The generated electricity can be used for the preparation of carbon dioxide adsorbent, further realizing the recovery and reuse of waste heat. The rotation of the vortex fans 3-6 drives the rotation of the air in the air barrel 3-1. The rotation of the air along the spiral groove 3-3 can avoid the generation of turbulent flow. At the same time, the rotation of the output shaft 3-5 drives the rotation of the ventilation fan 3-7. The rotation of the ventilation fan 3-7 can make the exhaust gas flow out quickly when it approaches the air outlet pipe 3-8, increasing the flow rate of the exhaust gas and completing the cycle to further avoid the generation of turbulent flow in the air barrel 3-1.

[0030] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claim.

[0031] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waste heat recovery and utilization device for a circulating fluidized bed boiler used in the preparation of a carbon dioxide adsorbent, characterized in that: Including: A heat exchange device (1), a filtration device (2) and a power generation device (3), wherein the heat exchange device (1) is fixedly communicated with the filtration device (2), and the filtration device (2) is fixedly communicated with the power generation device (3).

2. The waste heat recovery and utilization device for a circulating fluidized bed boiler used in the preparation of a carbon dioxide adsorbent according to claim 1, wherein: The heat exchange device (1) includes: a heat exchange box (1-1), an air inlet pipe (1-2), heat exchange pipes (1-3) and an induced draft fan (1-4). Inside the upper end of the heat exchange box (1-1), inside the air inlet pipe (1-2), and inside the lower end of the heat exchange box (1-1), there are heat exchange pipes (1-3) that are sequentially communicated. The heat exchange pipes (1-3) located at the upper end of the heat exchange box (1-1) are fixedly communicated with an induced draft fan (1-4).

3. The waste heat recovery and utilization device for a circulating fluidized bed boiler used in the preparation of a carbon dioxide adsorbent according to claim 2, characterized in that: The heat exchange pipes (1-3) arranged inside the upper end of the heat exchange box (1-1), inside the air inlet pipe (1-2), and inside the lower end of the heat exchange box (1-1) are all arranged in an S shape.

4. The waste heat recovery and utilization device for a circulating fluidized bed boiler used in the preparation of a carbon dioxide adsorbent according to claim 2, wherein: The filtration device (2) includes: a water tank (2-1), a filter disc unit (2-2), a conical hood (2-3), an ash discharge hood (2-4), a blower (2-5) and a filter plate unit (2-6). The water tank (2-1) is provided with a water inlet and air outlet. A filter disc unit (2-2) is fixed on the water tank (2-1). Conical hoods (2-3) are fixed on both sides above the filter disc unit (2-2). There is an ash discharge hood (2-4) on one side below the filter disc unit (2-2). A blower (2-5) is fixedly communicated with the other side below the filter disc unit (2-2). A filter plate unit (2-6) is rotationally and fittingly connected inside the filter disc unit (2-2). The ash discharge hood (2-4) is fixedly inserted into the water tank (2-1).

5. The waste heat recovery and utilization device for a circulating fluidized bed boiler used in the preparation of the carbon dioxide adsorbent according to claim 4, characterized in that: The filter disc unit (2-2) includes: a filter disc (2-2-1), a cavity one (2-2-2) and through holes (2-2-3). A filter disc (2-2-1) is fixed on the upper end of the water tank (2-1). A cavity one (2-2-2) is arranged inside the filter disc (2-2-1). Through holes (2-2-3) are symmetrically arranged up and down on the filter disc (2-2-1). For the through holes (2-2-3) located at the upper end, conical hoods (2-3) are fixedly communicated on both sides. For the through holes (2-2-3) located at the lower end, an ash discharge hood (2-4) is fixedly communicated with one side surface, and a blower (2-5) is fixedly communicated with the other side surface.

6. The waste heat recovery and utilization device for a circulating fluidized bed boiler used in the preparation of a carbon dioxide adsorbent according to claim 4, characterized in that: The filter plate unit (2-6) includes: a filter plate (2-6-1), a filter net (2-6-2), and a rotating shaft (2-6-3). The filter plate (2-6-1) is provided with four filter nets (2-6-2). The four filter nets (2-6-2) are arranged in a circumferential array. Sealing rings are provided on both sides of the four filter nets (2-6-2). A rotating shaft (2-6-3) is provided in the middle of the filter plate (2-6-1). The filter plate (2-6-1) fits and rotates in the first cavity (2-2-2). The size of the filter net (2-6-2) matches the size of the through hole (2-2-3). One end of the rotating shaft (2-6-3) rotates in the inner wall of one side of the first cavity (2-2-2), and the other side of the rotating shaft (2-6-3) rotates out of the side surface of the filter disc (2-2-1).

7. The waste heat recovery and utilization device for a circulating fluidized bed boiler used for preparing a carbon dioxide adsorbent according to claim 4, wherein: The power generation device (3) includes: a wind barrel (3-1), a second cavity (3-2), a spiral groove (3-3), a conical air hole (3-4), an output shaft (3-5), a vortex fan (3-6), a ventilation fan (3-7), and an air outlet pipe (3-8). A second cavity (3-2) is provided inside the side wall of the wind barrel (3-1). One side of the conical cover (2-3) is fixedly communicated with the second cavity (3-2). A spiral groove (3-3) is continuously provided on the inner wall of the wind barrel (3-1). A plurality of conical air holes (3-4) are evenly distributed at the bottom of the spiral groove (3-3). The conical air holes (3-4) are communicated with the second cavity (3-2). One end of the output shaft (3-5) rotates out of the side surface of the wind barrel (3-1), and the other end of the output shaft (3-5) is rotatably connected to the inner wall of the wind barrel (3-1) through a shaft bracket. A plurality of vortex fans (3-6) are provided on the output shaft (3-5). A ventilation fan (3-7) is fixed on the output shaft (3-5). An air outlet pipe (3-8) is provided at the front end of the wind barrel (3-1). The ventilation fan (3-7) is located at the rear end of the air outlet pipe (3-8).

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