Heat recovery system for dust-containing waste gas

Abstract

The invention discloses a heat recovery system for dust-containing waste gas, and relates to the technical field of waste gas treatment. The heat recovery system comprises a heat exchange device, a waste gas conveying device, a cold air conveying device, a preheated air conveying device and a waste gas retreatment device. The heat exchange device comprises a heat exchange mechanism, a first accommodating cavity and a second accommodating cavity; the heat exchange mechanism comprises a shell and a plurality of heat exchange pipes, an inner cavity of the shell is a heat exchange cavity, the waste gas conveying device is used for conveying dust-containing waste gas into the first containing cavity, and the cold air conveying device is used for conveying cold air into the heat exchange cavity. According to the heat recovery system, heat of the dust-containing waste gas can be recovered and used for preheating fresh air, the heat of the dust-containing waste gas can be recovered, energy waste can be reduced, original power consumption for heating the fresh air can be reduced, the purposes of saving energy and reducing consumption are achieved, and the technical blank of heat recovery of the dust-containing waste gas at present is filled up.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to a heat recovery system for dust-containing waste gas. Background Art

[0002] In industrial production, some dusty high-temperature waste gas (80-130°C) is often generated, and the waste heat recovery of these dusty high-temperature waste gases is very difficult. At present, large factories generally adopt the following method to recover the waste heat of dusty high-temperature waste gas: first remove the dust in the dusty high-temperature waste gas through high-voltage electrostatic precipitator equipment, and then directly reuse the high-temperature waste gas after dust removal to the process that needs to be heated in the production process, so as to achieve the purpose of waste heat recovery of dusty waste gas. However, the price of high-voltage electrostatic precipitator equipment is expensive and the energy consumption is large during operation, which makes the investment cost and operating cost large. In addition, the dust removal process of high-voltage electrostatic precipitator equipment takes a certain amount of time, resulting in a certain degree of heat loss during the dust removal process, reducing the heat recovery efficiency of dusty high-temperature waste gas. In addition, it is difficult for high-voltage electrostatic precipitator equipment to completely remove dust from dusty waste gas, and the dust removal gas obtained is directly reused in production, which may have an adverse effect on the subsequent heating process. Directly discharging dusty high-temperature exhaust gas from industrial production into the atmosphere will not only cause a large amount of heat waste, but also pollute the environment. Therefore, it is urgent to develop a heat recovery system for dusty exhaust gas with low cost, high heat recovery efficiency and suitable for small, medium and large enterprises.

[0003] In addition, high-temperature fresh air (i.e., high-temperature clean gas) is often needed in many processes of industrial production. At present, thermal oil or electric heaters are generally used to directly heat the cold air to make its temperature reach industrial requirements (such as 100-180°C) to obtain high-temperature fresh air. The method of using thermal oil or electric heaters to directly heat the cold air to obtain high-temperature fresh air consumes a lot of energy, which will significantly increase the production cost of the enterprise. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a heat recovery system for dust-containing exhaust gas, which is suitable for recovering heat from dust-containing exhaust gas. While recovering the heat of the dust-containing exhaust gas, it can be used to heat fresh air, thereby achieving the purpose of energy saving and consumption reduction, and the equipment investment cost and operating cost are low.

[0005] In order to solve the above technical problems, the present invention provides a heat recovery system for dust-containing exhaust gas, including a heat exchange device, an exhaust gas conveying device, a cold air conveying device, a preheated air conveying device and an exhaust gas reprocessing device;

[0006] The heat exchange device comprises a heat exchange mechanism, a cleaning mechanism, a first cover body and a second cover body, wherein the first cover body and the second cover body are respectively connected to the front and rear ends of the heat exchange mechanism, a first accommodating cavity is formed between the inner surface of the first cover body and the front end surface of the heat exchange mechanism, and a second accommodating cavity is formed between the inner surface of the second cover body and the rear end surface of the heat exchange mechanism;

[0007] The heat exchange mechanism comprises a shell and a plurality of heat exchange tubes, the plurality of heat exchange tubes are installed inside the shell, and the input ends of the plurality of heat exchange tubes are communicated with the first accommodating cavity, and the output ends of the plurality of heat exchange tubes are communicated with the second accommodating cavity, and the inner cavity of the shell is the heat exchange cavity;

[0008] The exhaust gas conveying device is connected to the first accommodating chamber, and is used to convey the dust-containing exhaust gas to the first accommodating chamber. The exhaust gas reprocessing device is connected to the second accommodating chamber, and is used to reprocess the dust-containing exhaust gas after heat exchange.

[0009] The cold air delivery device is connected to the input end of the heat exchange chamber, and the preheated air delivery device is connected to the output end of the heat exchange chamber. The cold air delivery device is used to deliver cold air into the heat exchange chamber, and the preheated air delivery device is used to deliver the preheated air formed after the cold air is heat exchanged to an external secondary heating device or gas-using equipment;

[0010] The cleaning mechanism is used for cleaning the inside of the heat exchange tube.

[0011] As an improvement of the above technical solution, the heat recovery system for dust-containing exhaust gas further includes a buffer water tank, the washing water input end of the buffer water tank is connected to an external washing water storage tank, the washing water output end of the buffer water tank is connected to the input end of the washing mechanism, and the washing mechanism is used to spray washing water into the interior of the heat exchange tube;

[0012] The first cover body is provided with a first sewage output end communicating with the first accommodating cavity, the second cover body is provided with a second sewage output end communicating with the second accommodating cavity, and the first sewage output end and the second sewage output end are both communicated with the reflux end of the buffer water tank.

[0013] As an improvement of the above technical solution, the heat recovery system for dust-containing exhaust gas also includes a booster pump, the cleaning water output end of the buffer water tank is connected to the input end of the booster pump, and the output end of the booster pump is connected to the input end of the cleaning mechanism.

[0014] As an improvement of the above technical solution, the cleaning mechanism includes a lifting drive component, a telescopic drive component, a cleaning execution component and a movable seat, the lifting drive component is installed on the outside of the heat exchange device, and the telescopic drive component, the cleaning execution component and the movable seat are all installed in the first accommodating chamber;

[0015] The telescopic driving component is fixedly mounted on the moving seat, the cleaning executing component is slidably mounted on the moving seat, the driving end of the telescopic driving component is connected to the cleaning executing component, and the telescopic driving component is used to drive the cleaning executing component to move closer to or away from the heat exchange tube;

[0016] The lifting drive assembly is connected to the moving seat, and the lifting drive assembly is used to drive the moving seat to reciprocate in the vertical direction;

[0017] The input end of the cleaning execution component is communicated with the cleaning water output end of the buffer water tank, the output end of the cleaning execution component is used to connect with the heat exchange tube, and the cleaning execution component is used to spray cleaning water into the interior of the heat exchange tube.

[0018] As an improvement of the above technical solution, a plurality of heat exchange tubes are installed inside the shell in a matrix arrangement;

[0019] The cleaning execution assembly includes a connection box and a plurality of cleaning nozzles, the connection box is slidably mounted on the moving seat, the plurality of cleaning nozzles are installed on the connection box at intervals along the same straight line, and the driving end of the telescopic driving assembly is connected to the connection box;

[0020] The interior of the connection box is hollow to form a cleaning water receiving chamber, the input end of the connection box is connected to the cleaning water output end of the buffer water tank, and the input ends of the plurality of cleaning nozzles are all extended into the telescopic drive assembly;

[0021] The distance between two adjacent cleaning nozzles corresponds to the distance between two adjacent heat exchange tubes; the size of the cleaning nozzle is matched to the inner diameter of the heat exchange tube.

[0022] As an improvement of the above technical solution, the number of the cleaning nozzles corresponds to the number of the heat exchange tubes in each row, so that the cleaning nozzles and the heat exchange tubes correspond one to one;

[0023] Alternatively, the cleaning mechanism further comprises a horizontal driving component, and the horizontal driving component is used to drive the cleaning execution component to reciprocate in the left-right direction;

[0024] Alternatively, the cleaning execution components are provided with a plurality of groups, each group of the cleaning execution components is provided with the connecting box, the plurality of connecting boxes are slidably installed on the movable seat along the same straight line, the input ends of the plurality of connecting boxes are respectively connected to the cleaning water output ends of the buffer water tank; the total number of the cleaning nozzles in the plurality of groups of the cleaning execution components corresponds to the number of the heat exchange tubes in each row.

[0025] As an improvement of the above technical solution, the cleaning mechanism also includes a fixed seat, a connecting seat and a connecting rod, the fixed seat is fixedly installed on the outside of the first cover body, the lifting drive assembly is installed on the fixed seat, the connecting seat is installed above the fixed seat, one end of the connecting rod is fixedly connected to the connecting seat, the other end of the connecting rod is fixedly connected to the movable seat, the fixed seat is connected to the connecting seat, and the lifting drive assembly is used to drive the connecting seat to reciprocate in the vertical direction.

[0026] As an improvement of the above technical solution, the heat recovery system for dust-containing exhaust gas further includes a first filter and a second filter;

[0027] The input end of the first filter is connected to an external cold air pipeline, the output end of the first filter is connected to the input end of the cold air delivery device, and the output end of the cold air delivery device is connected to the input end of the heat exchange chamber;

[0028] The output end of the heat exchange chamber is connected to the input end of the second filter, the output end of the second filter is connected to the input end of the preheating air conveying device, the output end of the preheating air conveying device is connected to an external secondary heating device, or the output end of the preheating air conveying device is connected to an external gas-using equipment.

[0029] As an improvement of the above technical solution, the cold air conveying device is provided with two output ends, one of which is connected to the input end of the heat exchange cavity, and the other output end of the cold air conveying device is connected to the gas input end of the first accommodating cavity.

[0030] As an improvement of the above technical solution, the heat recovery system for dust-containing exhaust gas further includes a spare pipeline, the input end of the exhaust gas conveying device is connected to the external dust-containing exhaust gas discharge pipeline, the input end of the spare pipeline is connected to the output end of the exhaust gas conveying device, and the output end of the spare pipeline is connected to the exhaust gas reprocessing device;

[0031] The standby pipeline is provided with a first regulating valve.

[0032] The implementation of the present invention has the following beneficial effects:

[0033] 1. The heat recovery system of this embodiment can recover the heat of dust-containing exhaust gas to preheat fresh air (i.e., cold air), thereby recovering the heat of dust-containing exhaust gas and reducing energy waste, and reducing the power consumption of heating fresh air, thereby achieving the purpose of energy saving and consumption reduction, and filling the current technical gap in heat recovery of dust-containing exhaust gas.

[0034] 2. The heat recovery system of this embodiment is suitable for heat recovery and utilization of exhaust gas containing a large amount of dust. By setting a cleaning mechanism in the heat exchange device, the dust attachment on the inner wall of the heat exchange tube can be cleaned regularly and regularly, reducing the impact of the dust attachment on the exhaust gas heat recovery, ensuring the heat exchange environment of the heat exchange tube is good, ensuring normal heat exchange, and thus improving the heat recovery efficiency, reducing the heat loss of dust-containing exhaust gas, and ensuring that the heat exchange tube remains unobstructed, preventing dust from clogging the heat exchange tube.

[0035] 3. The heat recovery system of this embodiment uses devices or components with low cost and consumes low power during operation, which can effectively reduce production and operating costs. It is suitable for small, medium and large enterprises to recover heat from dust-containing exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram of a heat recovery system for dust-containing exhaust gas in one embodiment of the present invention;

[0037] Figure 2 yes Figure 1 The schematic diagram of the structure of the heat exchange device in the heat recovery system of the dust-containing exhaust gas is shown;

[0038] Figure 3 yes Figure 2 A longitudinal cross-sectional view of the heat exchange device shown;

[0039] Figure 4 yes Figure 2 A schematic diagram of the structure of a cleaning mechanism in the heat exchange device shown;

[0040] Figure 5 yes Figure 4 A schematic structural diagram of the heat exchange device at another angle;

[0041] In the figure: a heat exchange device 1, a buffer water tank 2, an exhaust gas conveying device 3, a cold air conveying device 4, a preheated air conveying device 5, an exhaust gas reprocessing device 6, a pressure pump 8, a spare pipeline 9, a heat exchange mechanism 11, a cleaning mechanism 12, a first cover body 13, a second cover body 14, a first filter 71, a second filter 72, a shell 111, a heat exchange tube 112, a heat exchange cavity 113, a lifting drive assembly 121, a telescopic drive assembly 122, a cleaning execution assembly 123, a moving seat 124, a fixed seat 125, a connecting seat 126, a connecting rod 127, a first accommodating cavity 131, a first sewage output end 132, a gas input end 133, a second accommodating cavity 141, a second sewage output end 142, an exhaust gas output end 143, a connecting box 1231, and a cleaning nozzle 1232. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0043] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top” and “bottom” are 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. They 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 cannot be understood as a limitation on the present invention.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 direct connection, or an indirect connection 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.

[0045] like Figures 1 to 5 As shown, a heat recovery system for dust-containing exhaust gas comprises a heat exchange device 1, an exhaust gas conveying device 3, a cold air conveying device 4, a preheated air conveying device 5 and an exhaust gas reprocessing device 6;

[0046] The heat exchange device 1 comprises a heat exchange mechanism 11, a cleaning mechanism 12, a first cover body 13 and a second cover body 14, wherein the first cover body 13 and the second cover body 14 are respectively connected to the front and rear ends of the heat exchange mechanism 11, a first accommodating cavity 131 is formed between the inner surface of the first cover body 13 and the front end surface of the heat exchange mechanism 11, and a second accommodating cavity 141 is formed between the inner surface of the second cover body 14 and the rear end surface of the heat exchange mechanism 11;

[0047] The heat exchange mechanism 11 includes a shell 111 and a plurality of heat exchange tubes 112. The plurality of heat exchange tubes 112 are installed inside the shell 111, and the input ends of the plurality of heat exchange tubes 112 are communicated with the first accommodating cavity 131, and the output ends of the plurality of heat exchange tubes 112 are communicated with the second accommodating cavity 141. The inner cavity of the shell 111 is the heat exchange cavity 113.

[0048] The exhaust gas conveying device 3 is connected to the first accommodating chamber 131, and the exhaust gas conveying device 3 is used to convey the dust-containing exhaust gas to the first accommodating chamber 131. The exhaust gas reprocessing device 6 is connected to the second accommodating chamber 141, and the exhaust gas reprocessing device 6 is used to reprocess the dust-containing exhaust gas after heat exchange.

[0049] The cold air delivery device 4 is connected to the input end of the heat exchange chamber 113, and the preheated air delivery device 5 is connected to the output end of the heat exchange chamber 113. The cold air delivery device 4 is used to deliver cold air into the heat exchange chamber 113, and the preheated air delivery device 5 is used to deliver the preheated air formed after the cold air is heat exchanged to an external secondary heating device or gas-using equipment;

[0050] The cleaning mechanism 12 is used to clean the interior of the heat exchange tube 112 , thereby washing away dust attached to the inner wall of the heat exchange tube 112 .

[0051] It is worth noting that the heat recovery system for dust-containing waste gas in this embodiment recovers the heat in the dust-containing waste gas into cold air heating through heat exchange, which can effectively recover the heat in the dust-containing waste gas and reduce the waste heat of the dust-containing waste gas. Moreover, the recovered heat is directly used for preheating the cold air, which can increase the temperature of the cold air and obtain preheated air with a certain temperature, significantly reducing the energy consumption of heating the cold air in production, and achieving the dual purpose of recovering the waste heat of the dust-containing waste gas and preheating the fresh air. In addition, a cleaning mechanism 12 is provided in the heat exchange device 1, and the cleaning mechanism 12 can regularly clean the dust attachment on the inner wall of the heat exchange tube 112, reduce the influence of the dust attachment on the waste gas heat recovery, and make the heat exchange tube 112 always maintain a high heat exchange efficiency, thereby improving the heat recovery efficiency of the heat recovery system.

[0052] Further explanation, the heat recovery system of this embodiment is mainly used for heat recovery and utilization of waste gas containing a large amount of dust. Since the heat recovery system of this embodiment directly exchanges heat between the dust-containing waste gas discharged during production and the cold air to be heated in the heat exchange mechanism 11, the dust-containing waste gas does not need to go through the dust removal process, which avoids the heat loss of the dust-containing waste gas, ensures that the dust-containing waste gas has a higher heat, can better heat the cold air to be heated, and make the temperature of the obtained preheated air higher, which can effectively reduce the energy consumption of heating the cold air, and thus recover the heat of the dust-containing waste gas to a greater extent. During the heat exchange process, when the dust-containing waste gas passes through the heat exchange tube 112, it is easy to adsorb and deposit on the surface of the heat exchange tube 112, causing the heat exchange coefficient of the heat exchange device 1 to continue to decrease, and the heat exchange environment to continue to deteriorate, which will not only lead to a decrease in heat recovery efficiency and difficulty in fully recovering the heat of the dust-containing waste gas, but also may completely block the heat exchange tube 112, causing the dust-containing waste gas emission system to stop operating, and more seriously, even causing the serious consequence of factory shutdown. Therefore, by providing a cleaning mechanism 12 in the heat exchange device 1, the dust attachment on the inner wall of the heat exchange tube 112 can be cleaned regularly and regularly, reducing the impact of dust attachment on the waste gas heat recovery, ensuring a good heat exchange environment for the heat exchange tube 112, ensuring normal heat exchange, and thus improving the heat recovery efficiency, reducing the heat loss of dust-containing waste gas, and ensuring that the heat exchange tube 112 remains unobstructed, preventing dust from blocking the heat exchange tube 112. In addition, the cost of the device or device used in the heat recovery system of this embodiment is low, and the power consumed during operation is also low, which can effectively reduce production costs and operating costs, and is suitable for use in small, medium and large enterprises. In addition, in traditional industrial production processes, high-temperature fresh air is generally obtained by directly heating the cold air with heat transfer oil or electric heaters. This method consumes a high amount of energy and will significantly increase the production cost of the enterprise. The heat recovery system of this embodiment can preheat the cold air to a certain temperature through heat exchange, effectively recover the heat of the dust-containing waste gas, and use it to preheat the cold air to obtain preheated air with a certain temperature, which can significantly reduce the energy consumed by later heating and effectively reduce the production cost of the enterprise. In addition, when the temperature of the dust-containing waste gas is high and the temperature of the required high-temperature fresh air is low, the heat recovery system of this embodiment can be used for heat exchange to directly obtain the high-temperature fresh air of the target temperature, without further heating in the later stage, which can effectively reduce the production cost of the enterprise.

[0053] Specifically, the working process of the heat recovery system for dust-containing exhaust gas in this embodiment is as follows:

[0054] (1) The dust-containing waste gas (e.g., 80-130° C.) is transported to the heat exchange device 1 through the waste gas transport device 3, and enters the first accommodating chamber 131 through the gas input end 133 of the first accommodating chamber 131. Since the input end of the heat exchange tube 112 is connected to the first accommodating chamber 131, the dust-containing waste gas enters the heat exchange tube 112 from the first accommodating chamber 131 for heat exchange; at the same time, the cold air to be heated is pressurized and introduced into the heat exchange chamber 113 through the cold air transport device 4 for heat exchange. Since the heat exchange tube 112 is installed inside the heat exchange chamber 113, the dust-containing waste gas is heated in the heat exchange chamber 113. The tube 112 is used as a heat source for heat exchange to heat the cold air in the heat exchange chamber 113. After passing through the heat exchange chamber 113, the cold air forms preheated air with a certain temperature. The preheated air is output from the output end of the heat exchange chamber 113 to the preheated air conveying device 5, and is transported to the secondary heating device or gas-using equipment through the preheated air conveying device 5; the dust-containing exhaust gas enters the second accommodating chamber 141 after heat recovery through the heat exchange tube 112, and is output to the exhaust gas reprocessing device 6 through the exhaust gas output end 143 on the second accommodating chamber 141, and is further dust-removed in the exhaust gas reprocessing device 6.

[0055] (2) After the heat recovery system has been running for a certain period of time, a certain amount of dust is deposited on the inner wall of the heat exchange tube 112. At this time, the connecting pipeline between the exhaust gas conveying device 3 and the heat exchange mechanism 11 is closed, and the connecting pipeline between the heat exchange mechanism 11 and the exhaust gas reprocessing device 6 is closed. The inside of the heat exchange tube 112 is cleaned by the cleaning mechanism 12 to remove the dust attached to the inner wall of the heat exchange tube 112 to ensure the heat exchange efficiency.

[0056] In one embodiment, the heat recovery system for dust-containing exhaust gas further includes a buffer water tank 2, the washing water input end of the buffer water tank 2 is connected to an external washing water storage tank, the washing water output end of the buffer water tank 2 is connected to the input end of the washing mechanism 12, and the washing mechanism 12 is used to spray washing water into the interior of the heat exchange tube 112, thereby washing the interior of the heat exchange tube 112, so that the dust attachment attached to the inner wall of the heat exchange tube 112 is washed away;

[0057] The first cover body 13 is provided with a first sewage output end 132 communicating with the first accommodating cavity 131 , and the second cover body 14 is provided with a second sewage output end 142 communicating with the second accommodating cavity 141 , and both the first sewage output end 132 and the second sewage output end 142 are communicated with the reflux end of the buffer water tank 2 .

[0058] The buffer water tank 2 is filled with cleaning water from an external cleaning water storage tank. When cleaning the heat exchange tube 112, the connecting pipe between the buffer water tank 2 and the heat exchange mechanism 11 is opened to allow the cleaning water in the buffer water tank 2 to flow into the cleaning mechanism 12. The interior of the heat exchange tube 112 is cleaned by the cleaning mechanism 12 to remove dust attachments attached to the inner wall of the heat exchange tube 112.

[0059] Preferably, the cleaning water is hot water, which has a better cleaning effect.

[0060] In one embodiment, the heat recovery system for dust-containing exhaust gas also includes a booster pump 8 , the cleaning water output end of the buffer water tank 2 is connected to the input end of the booster pump 8 , and the output end of the booster pump 8 is connected to the input end of the cleaning mechanism 12 .

[0061] The buffer water tank 2 is filled with additional cleaning water, which is pressurized by the pressure pump 8 and then transported to the cleaning mechanism 12 through a pipeline to perform high-pressure flushing on the dust in the heat exchange tube 112. The cleaned sewage returns to the buffer water tank 2 through the first sewage output end 132 and the second sewage output end 142, and can be discharged through the sewage discharge end of the buffer water tank 2 after sedimentation.

[0062] Specifically, the cleaning water input end and the cleaning water output end of the buffer water tank 2 are arranged at the top or upper part of the buffer water tank 2, the reflux end of the buffer water tank 2 is arranged at the bottom or lower part of the buffer water tank 2, and the sewage discharge end of the buffer water tank 2 is arranged at the bottom of the buffer water tank 2.

[0063] In one embodiment, the cleaning mechanism 12 includes a lifting drive component 121, a telescopic drive component 122, a cleaning execution component 123 and a moving seat 124, wherein the lifting drive component 121 is installed outside the heat exchange device 1, and the telescopic drive component 122, the cleaning execution component 123 and the moving seat 124 are all installed in the first accommodating cavity 131;

[0064] The telescopic driving component 122 is fixedly mounted on the moving seat 124, and the cleaning execution component 123 is slidably mounted on the moving seat 124. The driving end of the telescopic driving component 122 is connected to the cleaning execution component 123, and the telescopic driving component 122 is used to drive the cleaning execution component 123 to move closer to or away from the heat exchange tube 112;

[0065] The lifting drive assembly 121 is connected to the moving seat 124, and the lifting drive assembly 121 is used to drive the moving seat 124 to reciprocate in the vertical direction;

[0066] The input end of the cleaning execution component 123 is connected to the cleaning water output end of the buffer water tank 2 , and the output end of the cleaning execution component 123 is used to connect to the heat exchange tube 112 . The cleaning execution component 123 is used to spray cleaning water into the interior of the heat exchange tube 112 .

[0067] Specifically, when heat exchange is performed inside the heat exchange mechanism 11, the movable seat 124, the telescopic drive assembly 122 and the cleaning execution assembly 123 are moved to the top of the first accommodating chamber 131 under the driving action of the lifting drive assembly 121, so that the dust-containing exhaust gas can be better passed from the first accommodating chamber 131 to each heat exchange tube 112, and the deposition of dust-containing exhaust gas on the movable seat 124, the telescopic drive assembly 122 and the cleaning execution assembly 123 is reduced. When cleaning the heat exchange tube 112, the movable seat 124 is driven by the lifting drive assembly 121 to move in the vertical direction in the first accommodating chamber 131, so that the height of the cleaning execution assembly 123 corresponds to the height of the heat exchange tube 112 to be cleaned. Then, under the driving action of the telescopic driving component 122, the cleaning execution component 123 is brought close to the heat exchange tube 112, so that the output end of the cleaning execution component 123 is pressed against the pipe mouth of the heat exchange tube 112 along the axial direction of the heat exchange tube 112, and the output end of the cleaning execution component 123 is extended into the pipe mouth of the heat exchange tube 112, and then the pressure pump 8 is started by controlling the external control system to spray high-pressure water into the heat exchange tube 112 through the cleaning execution component 123 to wash away the dust attachment in the heat exchange tube 112. After a row of heat exchange tubes 112 are cleaned, the booster pump 8 stops working, and the telescopic drive assembly 122 drives the cleaning execution assembly 123 to move away from the heat exchange tube 112, so that the cleaning execution assembly 123 and the heat exchange tube 112 are separated. At this time, the lifting drive assembly 121 drives the moving seat 124, the telescopic drive assembly 122 and the cleaning execution assembly 123 to move downward synchronously to the position corresponding to the next row of heat exchange tubes 112, and repeats the above operation until all heat exchange tubes 112 are cleaned. The flushed sewage mainly flows into the second accommodating chamber 141 through the output end of the heat exchange tube 112. After the cleaning execution assembly 123 and the heat exchange tube 112 are separated, a small amount of sewage will also drip from the output end of the heat exchange tube 112 to the first accommodating chamber 131, and some residual cleaning water may also drip from the output end of the cleaning execution assembly 123 to the first accommodating chamber 131.

[0068] Through the cooperation of the lifting drive component 121, the telescopic drive component 122 and the cleaning execution component 123, the cleaning execution component 123 can clean the dust inside the heat exchange tubes 112 of each layer in batches, and the sewage after cleaning is discharged into the buffer water tank 2 through the first sewage output terminal 132 and the second sewage output terminal 142 located at the bottom of the heat exchange device 1.

[0069] Preferably, the lifting drive assembly 121 is a combination of one or more of a lift, a cylinder or a servo motor.

[0070] Preferably, the telescopic drive assembly 122 is a cylinder.

[0071] In one embodiment, the plurality of heat exchange tubes 112 are installed in a matrix arrangement inside the housing 111, which is conducive to the cleaning nozzle 1232 to quickly dock with the heat exchange tube 112, thereby facilitating the improvement of cleaning efficiency;

[0072] The cleaning execution component 123 includes a connection box 1231 and a plurality of cleaning nozzles 1232. The connection box 1231 is slidably mounted on the movable seat 124. The plurality of cleaning nozzles 1232 are installed on the connection box 1231 at intervals along the same straight line. The driving end of the telescopic driving component 122 is connected to the connection box 1231. The telescopic driving component 122 can drive the connection box 1231 to reciprocate along the axial direction of the heat exchange tube 112, so that the connection box 1231 approaches or moves away from the heat exchange tube 112, so that the cleaning nozzle 1232 is docked with the nozzle of the heat exchange tube 112, or the cleaning nozzle 1232 is separated from the heat exchange tube 112.

[0073] The interior of the connection box 1231 is hollow, forming a cleaning water receiving chamber, the input end of the connection box 1231 is connected to the cleaning water output end of the buffer tank 2, and the input ends of the plurality of cleaning nozzles 1232 are all extended into the telescopic drive assembly 122, so that the input ends of the cleaning nozzles 1232 are connected to the cleaning water receiving chamber;

[0074] The spacing between two adjacent cleaning nozzles 1232 corresponds to the spacing between two adjacent heat exchange tubes 112, and the size of the cleaning nozzle 1232 is matched with the inner diameter of the heat exchange tube 112, ensuring that after the cleaning nozzle 1232 extends into the interior of the heat exchange tube 112, the cleaning nozzle 1232 and the inner wall of the heat exchange tube 112 can be in close contact to form a sealing effect, ensuring that there is no water leakage during cleaning.

[0075] Preferably, the cleaning nozzle 1232 is made of elastic material, so that the cleaning nozzle 1232 and the inner wall of the heat exchange tube 112 are in closer contact, ensuring no water leakage, so that the cleaning water can be more effectively sprayed into the interior of the heat exchange tube 112, achieving a better flushing effect, and allowing the flushed cleaning water to flow out from the output end of the heat exchange tube 112 and flow into the second accommodating chamber 141.

[0076] In one embodiment, the number of the cleaning nozzles 1232 in the cleaning execution component 123 corresponds to the number of the heat exchange tubes 112 in each row, so that the cleaning nozzles 1232 and the heat exchange tubes 112 correspond one to one. In this embodiment, only the lifting drive component 121 needs to be set up, so that the dust inside the heat exchange tubes 112 of each layer can be cleaned batch by batch, and the cleaning work of all the heat exchange tubes 112 can be completed.

[0077] In another embodiment, the cleaning mechanism 12 further includes a horizontal driving component, which is used to drive the cleaning execution component 123 to reciprocate in the left and right directions; when the number of cleaning nozzles 1232 in the cleaning execution component 123 is less than the number of the heat exchange tubes 112 in each row, by adding a horizontal driving component, the cleaning execution component 123 can move horizontally to determine the heat exchange tubes 112 in the vertical column, and the cleaning work of all the heat exchange tubes 112 can be completed through the cooperation of the horizontal driving component and the lifting driving component 121. Preferably, the horizontal driving component is a rodless cylinder or a telescopic cylinder.

[0078] In another embodiment, the cleaning execution components 123 are provided with multiple groups, each group of the cleaning execution components 123 is provided with a connection box 1231 and multiple cleaning nozzles 1232, multiple connection boxes 1231 are slidably installed on the moving seat 124 along the same straight line, and the input ends of the multiple connection boxes 1231 are respectively connected to the cleaning water output ends of the buffer water tank 2; the total number of the cleaning nozzles 1232 in the multiple groups of the cleaning execution components 123 corresponds to the number of the heat exchange tubes 112 in each row. In this embodiment, by providing multiple groups of cleaning execution components 123, and the total number of cleaning nozzles 1232 corresponds to the number of the heat exchange tubes 112 in each row, it is only necessary to provide a lifting drive component 121 to complete the cleaning work of all the heat exchange tubes 112. In this embodiment, the cleaning mechanism may be provided with only one telescopic driving assembly, and the connection boxes 1231 of the multiple groups of cleaning execution assemblies 123 are sequentially fixedly connected as a whole along the same straight line, so that the multiple groups of cleaning execution assemblies 123 can be driven by one telescopic driving assembly to simultaneously move closer to or away from the heat exchange tube 112. In addition, multiple telescopic driving assemblies may also be provided, and the multiple telescopic driving assemblies and the multiple groups of cleaning execution assemblies 123 are respectively connected one by one, so that one telescopic driving assembly is used to drive one group of cleaning execution assemblies 123.

[0079] In one embodiment, the cleaning mechanism 12 also includes a fixed seat 125, a connecting seat 126 and a connecting rod 127, the fixed seat 125 is fixedly installed on the outside of the first cover body 13, the lifting drive assembly 121 is installed on the fixed seat 125, the connecting seat 126 is installed above the fixed seat 125, one end of the connecting rod 127 is fixedly connected to the connecting seat 126, and the other end of the connecting rod 127 is fixedly connected to the movable seat 124, the fixed seat 125 and the connecting seat 126 are connected, and the lifting drive assembly 121 is used to drive the connecting seat 126 to reciprocate in the vertical direction, thereby driving the movable seat 124, the telescopic drive assembly 122 and the cleaning execution assembly 123 to reciprocate in the vertical direction, so that the cleaning nozzle 1232 moves to the position corresponding to the heat exchange tube 112 that needs to be cleaned.

[0080] In one embodiment, the heat recovery system for dust-containing exhaust gas further includes a first filter 71 and a second filter 72;

[0081] The input end of the first filter 71 is connected to the external cold air pipe, the output end of the first filter 71 is connected to the input end of the cold air conveying device 4, and the output end of the cold air conveying device 4 is connected to the input end of the heat exchange chamber 113; the cold air passes through the first filter 71 and is pressurized by the cold air conveying device 4 before entering the heat exchange chamber 113 for heat exchange. The cold air can be filtered by the first filter 71, so that the cold air contains almost no dust after passing through the first filter 71. After the cold air enters the heat exchange chamber 113, the dust deposition on the outer surface of the heat exchange tube 112 can be reduced, ensuring that during the long-term operation of the heat recovery system, the heat exchange coefficient of the heat exchange mechanism 11 will not drop significantly, and the increase in heat exchange thermal resistance can be minimized, thereby being able to maintain a better heat exchange efficiency for a long time, so that the heat of the dust-containing exhaust gas can be better recovered and the cold air can be better heated.

[0082] The output end of the heat exchange chamber 113 is connected to the input end of the second filter 72, the output end of the second filter 72 is connected to the input end of the preheated air conveying device 5, the output end of the preheated air conveying device 5 is connected to an external secondary heating device, or the output end of the preheated air conveying device 5 is connected to an external gas-using device. By providing the second filter 72, the preheated air obtained after heat exchange can be further filtered, and dust in the air can be further removed, thereby further purifying the preheated air. When the preheated air is used in subsequent processes, it can ensure that the subsequent processes are carried out normally and will not affect the performance of the product.

[0083] Preferably, the first filter 71 and the second filter 72 are both air filters.

[0084] In one embodiment, the cold air delivery device 4 has two output ends, one of which is connected to the input end of the heat exchange cavity 113 , and the other is connected to the gas input end of the first accommodating cavity 131 .

[0085] It is worth noting that the input end of the heat exchange chamber 113 and the gas input end of the first accommodating chamber 131 are respectively connected to the two output ends of the cold air conveying device 4. When the heat recovery system operates normally (i.e., when heat exchange is performed), the connecting pipeline between the cold air conveying device 4 and the first accommodating chamber 131 is closed, and the connecting pipeline between the cold air conveying device 4 and the heat exchange chamber 113 is connected, and the cold air to be heated is introduced into the heat exchange chamber 113 for heat exchange, and the cold air is heated to obtain preheated gas with a certain temperature. When cleaning the heat recovery system, close the connecting pipeline between the cold air conveying device 4 and the heat exchange chamber 113, and open the connecting pipeline between the cold air conveying device 4 and the first accommodating chamber 131 after cleaning, so that the cold air conveying device 4 conveys the cold air to the first accommodating chamber 131, and enters the interior of the heat exchange tube 112 through the first accommodating chamber 131. The cold air at this time is used as drying air after the heat exchange tube 112 is cleaned, and the heat exchange tube 112 is dried. After passing through the heat exchange tube 112, the cold air is output from the exhaust gas output end on the second accommodating chamber 141.

[0086] In one embodiment, a spare pipe 9 is further included, wherein the input end of the exhaust gas conveying device 3 is connected to an external dust-containing exhaust gas discharge pipe, the input end of the spare pipe 9 is connected to the output end of the exhaust gas conveying device 3, and the output end of the spare pipe 9 is connected to the exhaust gas reprocessing device 6;

[0087] The standby pipeline 9 is provided with a first regulating valve.

[0088] When the heat recovery system fails or the heat exchange pipe 112 is clogged with dust, the high-temperature dust-containing waste gas discharged by the waste gas conveying device 3 can be directly conveyed to the waste gas reprocessing device 6 through the spare pipeline 9, and the dust-containing waste gas is processed by the waste gas reprocessing device 6. When the heat recovery system operates normally, the first regulating valve on the spare pipeline 9 is adjusted to a closed state, so that the dust-containing waste gas is conveyed to the heat exchange device 1 through the waste gas conveying device 3 for heat exchange.

[0089] like Figure 1As shown, a second regulating valve is provided on the connecting pipe between the exhaust gas conveying device 3 and the gas input end 133 of the heat exchange device 1, a third regulating valve is provided on the connecting pipe between the cold air conveying device 4 and the gas input end 133 of the heat exchange device 1, a fourth regulating valve is provided on the connecting pipe between the cold air conveying device 4 and the input end of the heat exchange chamber 113, and a fifth regulating valve is provided on the connecting pipe between the exhaust gas output end 143 and the exhaust gas reprocessing device 6. The opening and closing of the connecting pipes and the flow rate of the pipes are controlled respectively by the regulating valves on the connecting pipes. Preferably, each regulating valve is connected to an external control system signal, and the automatic control of each regulating valve can be realized through the control system, so that the heat recovery system can be automatically controlled.

[0090] Preferably, the exhaust gas reprocessing device 6 is a wet dust collector, and the exhaust gas output end of the second accommodating chamber 141 is connected to the input end of the wet dust collector. After heat exchange by the heat exchange device 1, the heat in the dust-containing exhaust gas has been largely recovered. At this time, the temperature of the dust-containing exhaust gas discharged from the second accommodating chamber 141 has been significantly reduced. After the cooled dust-containing exhaust gas is passed into the wet dust collector for dust removal, the gas can be directly discharged, which has little pollution to the environment. The wet dust collector can effectively remove dust from the airflow, and at the same time, it can also remove some gaseous pollutants, and the wet dust collector has the advantages of simple structure, small footprint, convenient operation and maintenance, and high purification efficiency.

[0091] Specifically, the exhaust gas conveying device 3, the cold air conveying device 4 and the preheated air conveying device 5 can all be selected from common machines that can increase gas pressure and convey gas. Preferably, the exhaust gas conveying device 3, the cold air conveying device 4 and the preheated air conveying device 5 can be selected from fans.

[0092] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A heat recovery system for dust-containing waste gas, characterized in that: It includes a heat exchange device, an exhaust gas conveying device, a cold air conveying device, a preheated air conveying device and an exhaust gas reprocessing device; The heat exchange device comprises a heat exchange mechanism, a first cover body and a second cover body, wherein the first cover body and the second cover body are respectively connected to the front and rear ends of the heat exchange mechanism, a first accommodation cavity is formed between the inner surface of the first cover body and the front end surface of the heat exchange mechanism, and a second accommodation cavity is formed between the inner surface of the second cover body and the rear end surface of the heat exchange mechanism; The heat exchange mechanism comprises a shell and a plurality of heat exchange tubes, the plurality of heat exchange tubes are installed inside the shell, and the input ends of the plurality of heat exchange tubes are communicated with the first accommodating cavity, and the output ends of the plurality of heat exchange tubes are communicated with the second accommodating cavity, and the inner cavity of the shell is the heat exchange cavity; The exhaust gas conveying device is connected to the first accommodating chamber, and is used to convey the dust-containing exhaust gas to the first accommodating chamber. The exhaust gas reprocessing device is connected to the second accommodating chamber, and is used to reprocess the dust-containing exhaust gas after heat exchange. The cold air conveying device is connected to the input end of the heat exchange chamber, and the output end of the heat exchange chamber is connected to the preheated air conveying device. The cold air conveying device is used to convey cold air into the heat exchange chamber, and the cold air forms preheated air after heat exchange in the heat exchange chamber.

2. The heat recovery system for dust-containing exhaust gas according to claim 1, characterized in that: The heat exchange device further includes a cleaning mechanism, and the heat recovery system for dust-containing exhaust gas further includes a buffer water tank, the cleaning water input end of the buffer water tank is connected to an external cleaning water storage tank, the cleaning water output end of the buffer water tank is connected to the input end of the cleaning mechanism, and the cleaning mechanism is used to spray cleaning water into the interior of the heat exchange tube; The first cover body is provided with a first sewage output end communicating with the first accommodating cavity, the second cover body is provided with a second sewage output end communicating with the second accommodating cavity, and the first sewage output end and the second sewage output end are both communicated with the reflux end of the buffer water tank.

3. The heat recovery system for dust-containing exhaust gas according to claim 2, characterized in that: The heat recovery system for dust-containing exhaust gas also includes a pressure pump, the cleaning water output end of the buffer water tank is connected to the input end of the pressure pump, and the output end of the pressure pump is connected to the input end of the cleaning mechanism.

4. The heat recovery system for dust-containing exhaust gas according to claim 3, characterized in that: The cleaning mechanism comprises a lifting drive component, a telescopic drive component, a cleaning execution component and a moving seat, wherein the lifting drive component is installed outside the heat exchange device, and the telescopic drive component, the cleaning execution component and the moving seat are all installed in the first accommodating chamber; The telescopic driving component is fixedly mounted on the moving seat, the cleaning executing component is slidably mounted on the moving seat, the driving end of the telescopic driving component is connected to the cleaning executing component, and the telescopic driving component is used to drive the cleaning executing component to move closer to or away from the heat exchange tube; The lifting drive assembly is connected to the moving seat, and the lifting drive assembly is used to drive the moving seat to reciprocate in the vertical direction; The input end of the cleaning execution component is communicated with the cleaning water output end of the buffer water tank, the output end of the cleaning execution component is used to connect with the heat exchange tube, and the cleaning execution component is used to spray cleaning water into the interior of the heat exchange tube.

5. The heat recovery system for dust-containing exhaust gas according to claim 4, characterized in that: A plurality of heat exchange tubes are installed inside the shell in a matrix arrangement; The cleaning execution assembly includes a connection box and a plurality of cleaning nozzles, the connection box is slidably mounted on the moving seat, the plurality of cleaning nozzles are installed on the connection box at intervals along the same straight line, and the driving end of the telescopic driving assembly is connected to the connection box; The interior of the connection box is hollow to form a cleaning water receiving chamber, the input end of the connection box is connected to the cleaning water output end of the buffer water tank, and the input ends of the plurality of cleaning nozzles are all extended into the telescopic drive assembly; The distance between two adjacent cleaning nozzles corresponds to the distance between two adjacent heat exchange tubes; the size of the cleaning nozzle is matched to the inner diameter of the heat exchange tube.

6. The heat recovery system for dust-containing exhaust gas according to claim 5, characterized in that: The number of the cleaning nozzles corresponds to the number of the heat exchange tubes in each row, so that the cleaning nozzles correspond to the heat exchange tubes one by one; Alternatively, the cleaning mechanism further comprises a horizontal driving component, and the horizontal driving component is used to drive the cleaning execution component to reciprocate in the left-right direction; Alternatively, the cleaning execution components are provided with a plurality of groups, each group of the cleaning execution components is provided with the connecting box, the plurality of connecting boxes are slidably installed on the movable seat along the same straight line, the input ends of the plurality of connecting boxes are respectively connected to the cleaning water output ends of the buffer water tank; the total number of the cleaning nozzles in the plurality of groups of the cleaning execution components corresponds to the number of the heat exchange tubes in each row.

7. The heat recovery system for dust-containing exhaust gas according to claim 5, characterized in that: The cleaning mechanism also includes a fixed seat, a connecting seat and a connecting rod, the fixed seat is fixedly installed on the outside of the first cover body, the lifting drive assembly is installed on the fixed seat, the connecting seat is installed above the fixed seat, one end of the connecting rod is fixedly connected to the connecting seat, the other end of the connecting rod is fixedly connected to the movable seat, the fixed seat is connected to the connecting seat, and the lifting drive assembly is used to drive the connecting seat to reciprocate in the vertical direction.

8. The heat recovery system for dust-containing exhaust gas according to claim 1, characterized in that: The heat recovery system for dust-containing exhaust gas also includes a first filter and a second filter; The input end of the first filter is connected to an external cold air pipeline, the output end of the first filter is connected to the input end of the cold air delivery device, and the output end of the cold air delivery device is connected to the input end of the heat exchange chamber; The output end of the heat exchange chamber is connected to the input end of the second filter, the output end of the second filter is connected to the input end of the preheating air conveying device, the output end of the preheating air conveying device is connected to an external secondary heating device, or the output end of the preheating air conveying device is connected to an external gas-using equipment.

9. The heat recovery system for dust-containing exhaust gas according to claim 1, characterized in that: The cold air delivery device is provided with two output ends, one of which is connected to the input end of the heat exchange cavity, and the other output end of the cold air delivery device is connected to the gas input end of the first accommodating cavity.

10. The heat recovery system for dust-containing exhaust gas according to claim 1, characterized in that: The heat recovery system for dust-containing exhaust gas further comprises a spare pipeline, the input end of the exhaust gas conveying device is connected to an external dust-containing exhaust gas discharge pipeline, the input end of the spare pipeline is connected to the output end of the exhaust gas conveying device, and the output end of the spare pipeline is connected to the exhaust gas reprocessing device; The standby pipeline is provided with a first regulating valve.

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