Flue gas waste heat recovery device

Abstract

The utility model discloses a flue gas waste heat recovery device, and relates to the technical field of flue gas waste heat recovery, the flue gas waste heat recovery device comprises an asymmetric plate heat exchanger, a condensate water storage place and a pressure difference monitoring device, and a nozzle of the asymmetric plate heat exchanger can spray water to a plate sheet forming a thermal medium channel; condensate water generated by the asymmetric plate heat exchanger can be discharged through the condensate water port, and sewage generated by cleaning can be discharged through the drain outlet. The condensate water port and the drain outlet can be respectively controlled to be opened and closed; the two monitoring ends of the pressure difference monitoring device are used for monitoring the pressure values of the air inlet and the air outlet correspondingly, the pressure difference of the air inlet and the air outlet can be obtained through the pressure difference monitoring device, the flue gas waste heat recovery device can determine when cleaning is needed through the pressure detection device, and the operation is simple and convenient; condensate water can be stored in the condensate water storage position and used for cleaning, and waste of the condensate water is avoided.

Description

Technical Field

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

[0002] In the washing, fiber and papermaking industries, the flue gas waste heat recovery system (mainly plate heat exchanger) used in hot air furnaces and drying equipment, because the exhaust gas contains fibers and lint and other debris, will cause the plate heat exchanger to be blocked after running for a period of time, causing a significant decrease in heat exchange capacity, and it is necessary to stop the machine for cleaning, and the shutdown will lead to production suspension, which also increases the maintenance cost of the plate heat exchanger. Chinese patent CN112665450A discloses a whitening heat exchange system and a whitening heat exchanger online cleaning method. The whitening heat exchange system is provided with a cleaning system for cleaning the heat exchange plate. When cleaning, the flue gas channel is first switched to pass through the circulating water tank, and then the cleaning is completed through acid washing, alkali washing and drying. However, the whitening heat exchange system is not provided with a device for monitoring the degree of dirt adhesion, and the staff needs to use other equipment to monitor it, which is inconvenient; the condensed water generated by the heat exchanger during operation is not fully utilized, resulting in a waste of resources. Therefore, there is an urgent need for a flue gas waste heat recovery device that is convenient for monitoring the degree of dirt adhesion and can fully utilize the condensed water. Utility Model Content

[0003] The utility model aims to provide a flue gas waste heat recovery device to solve the problems existing in the above-mentioned prior art, which is convenient for monitoring the degree of dirt adhesion on the plate and can make full use of condensed water.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides a flue gas waste heat recovery device, including an asymmetric plate heat exchanger, a condensed water storage place and a pressure difference monitoring device, wherein the asymmetric plate heat exchanger has a heat medium channel, and nozzles are arranged at the air inlet and exhaust port of the heat medium channel, and each nozzle can spray water onto the plate forming the heat medium channel; the heat exchanger is provided with a drain port connected to the heat medium channel, and the drain port is connected to the condensed water port and the sewage port, the condensed water port, the condensed water storage place and the nozzles are connected in sequence, and the condensed water stored in the condensed water storage place is discharged through a power source +It is driven to flow toward the nozzle and spray out from the nozzle, the condensed water generated by the asymmetric plate heat exchanger can be discharged through the condensed water outlet, and the sewage generated by cleaning can be discharged through the sewage outlet; the condensed water outlet and the sewage outlet can be controlled to open and close respectively; the pressure difference monitoring device has two monitoring ends, and the two monitoring ends are used to monitor the pressure values ​​of the air inlet and the exhaust port respectively, and the pressure difference between the air inlet and the exhaust port can be obtained through the pressure difference monitoring device.

[0006] Preferably, each of the nozzles is fixedly connected to the top of each of the air inlet and the air outlet.

[0007] Preferably, it also includes a drain pipe, one end of which is connected to and communicated with the drain outlet, and the other end branches out to form a condensation pipe and a sewage pipe, the pipe opening at one end of the condensation pipe away from the drain outlet is the condensation water outlet, and the pipe opening at one end of the sewage pipe away from the drain outlet is the sewage outlet.

[0008] Preferably, a first valve is provided on the condenser pipe, and a second valve is provided on the sewage pipe.

[0009] Preferably, the condensate storage place is connected to the nozzle via a pipeline, and the power source is also provided on the pipeline, and the power source is a high-pressure water pump.

[0010] Preferably, a liquid level detection device is further provided in the condensed water storage place, and the liquid level detection device is used to detect the height of the liquid level in the condensed water storage place.

[0011] Preferably, a controller is further included, the first valve and the second valve are both electric valves, and the controller is signal-connected to the power source, the first valve, the second valve, the liquid level detection device and the pressure difference monitoring device respectively.

[0012] Preferably, an overflow pipe is also provided on the condensed water storage place, and the condensed water storage place has a water storage space. One end of the overflow pipe is connected and communicated with the side near the top of the water storage space, and the other end is not higher than the end of the overflow pipe connected to the water storage space.

[0013] Compared with the prior art, the utility model has achieved the following technical effects:

[0014] The flue gas waste heat recovery device provided by the utility model is provided with a nozzle, which can spray water and clean the plates forming the heat medium channel when the heat exchanger is working, thereby avoiding shutdown and production suspension; the condensed water generated in the heat exchanger can flow out through the drain port and the condensed water port, and flow into the condensed water storage place along the pipeline for storage. When the heat exchange plate needs to be cleaned, the water in the condensed water storage place can be used for cleaning, thereby making full use of the condensed water and avoiding waste of resources; the pressure difference between the air inlet and the exhaust port can be monitored by the pressure difference monitoring device, and the staff can conveniently monitor the degree of dirt adhesion in real time without the help of other equipment, so as to determine when cleaning is needed. Therefore, the flue gas waste heat recovery device provided by the utility model cleans the plates through the nozzle, thereby avoiding shutdown and production suspension; collects condensed water and recycles it, thereby avoiding waste of resources; and monitors the degree of dirt adhesion through the pressure difference monitoring device, without the help of other equipment, which is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A structural schematic diagram of a flue gas waste heat recovery device is provided for the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the structure of the asymmetric plate heat exchanger;

[0018] Figure 3 for Figure 1 The three-dimensional structure diagram of the asymmetric plate heat exchanger;

[0019] In the figure: 1-asymmetric plate heat exchanger, 11-drain pipe, 111-drain port, 12-air inlet, 13-exhaust port, 14-heat medium channel, 15-plate, 2-condensate storage place, 21-overflow pipe, 3-pressure difference monitoring device, 4-nozzle, 5-condensate pipe, 51-condensate port, 52-first valve, 6-drain pipe, 61-drain port, 62-second valve, 7-liquid level detection device, 8-power source, 9-controller. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model aims to provide a flue gas waste heat recovery device to solve the problems existing in the prior art, which is convenient for monitoring the degree of dirt adhesion on the plate and can make full use of condensed water.

[0022] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The utility model provides a flue gas waste heat recovery device, such as Figure 1-3 As shown, it includes an asymmetric plate heat exchanger 1, a condensate storage place 2 and a pressure difference monitoring device 3. The asymmetric plate heat exchanger 1 has a heat medium channel 14. The air inlet 12 and the exhaust port 13 of the heat medium channel 14 are both provided with nozzles 4. Each nozzle 4 can spray water onto the plate 15 forming the heat medium channel 14; the heat exchanger is provided with a drain port 111 connected to the heat medium channel 14, and the drain port 111 is connected to the condensate port 51 and the sewage port 61. The condensate port 51, the condensate storage place 2 and the nozzle 4 are connected in sequence, and the cold The condensed water stored in the condensed water storage place 2 is driven by the power source 8 to flow toward the nozzle 4 and sprayed out from the nozzle 4. The condensed water generated by the asymmetric plate heat exchanger 1 can be discharged through the condensed water outlet 51, and the sewage generated by cleaning can be discharged through the sewage outlet 61; the condensed water outlet 51 and the sewage outlet 61 can be controlled to open and close respectively; the pressure difference monitoring device 3 has two monitoring ends, and the two monitoring ends are used to monitor the pressure values ​​of the air inlet 12 and the exhaust port 13 respectively. The pressure difference between the air inlet 12 and the exhaust port 13 can be obtained through the pressure difference monitoring device 3.

[0024] The cleaning process of the flue gas waste heat recovery device provided by the utility model is as follows: when the asymmetric plate heat exchanger 1 is operating normally, the drain outlet 61 is closed, the condensed water flows through the drain outlet 111 and is discharged to the condensed water storage place 2 through the condensed water outlet 51 for storage; the pressure difference between the air inlet 12 and the exhaust port 13 is detected by the pressure difference monitoring device 3. When the pressure difference is greater than the threshold value, the condensed water outlet 51 is closed and the drain outlet 61 is opened. The staff turns on the power source 8 to drive the water in the condensed water storage place 2 to spray out from the nozzle 4 and clean the plate 15 forming the heat medium channel 14. The cleaned dirt can be discharged through the drain outlet 61.

[0025] The flue gas waste heat recovery device provided by the utility model is mainly used in the flue gas waste heat recovery system of hot air furnaces and drying equipment in the washing, fiber, papermaking and other industries (not limited to the above industries), and is not limited to gas-water heat exchange, but can also be gas-liquid heat exchange (the liquid can be oil or other liquids). The flue gas waste heat recovery device uses an asymmetric plate heat exchanger 1, which has high heat exchange efficiency and strong corrosion resistance; a nozzle 4 is arranged on the asymmetric plate heat exchanger 1, and the nozzle 4 can be driven by a power source 8 to spray water and clean the plate 15 forming the heat medium channel 14 when the heat exchanger is working, thereby avoiding shutdown and production stoppage; the condensed water generated in the heat exchanger can flow out through the drain port 111 and the condensed water port 51, and flow along the pipeline into the condensed water storage place 2 for storage. The condensed water storage place 2 is preferably a box with an upper end opening. When the heat exchange plate needs to be cleaned, the water in the condensed water storage place 2 can be used for cleaning, thereby making full use of the condensed water and avoiding waste of resources; the pressure difference monitoring device 3 can monitor the pressure difference between the air inlet 12 and the exhaust port 13, and the staff can conveniently monitor the degree of dirt adhesion in real time without the help of other equipment, so as to determine when cleaning is needed. Therefore, the flue gas waste heat recovery device provided by the utility model cleans the plate 15 through the nozzle 4, avoiding shutdown and production stoppage; collects condensed water and recycles it, avoiding waste of resources; and monitors the degree of dirt adhesion through the pressure difference monitoring device 3, without the need for other equipment, which is simple and convenient.

[0026] In a preferred implementation of this embodiment, each of the tops of the air inlet 12 and the exhaust port 13 is fixedly connected with a nozzle 4. The nozzle 4 is arranged at the top of the air inlet 12 and the exhaust port 13, and the water sprayed by the nozzle 4 can be sprayed on the top of the plate 15, and the water flows down along the plate 15 and flows through the entire plate 15, thereby enhancing the cleaning effect.

[0027] In a preferred implementation manner of this embodiment, a drain pipe 11 is also included, one end of the drain pipe 11 is connected to and communicated with the drain outlet 111, and the other end is branched to form a condenser pipe 5 and a sewage pipe 6, the pipe opening at one end of the condenser pipe 5 away from the drain outlet 111 is a condensation water outlet 51, and the pipe opening at one end of the sewage pipe 6 away from the drain outlet 111 is a sewage outlet 61.

[0028] In a preferred implementation of this embodiment, a first valve 52 is provided on the condenser pipe 5, and a second valve 62 is provided on the drain pipe 6. The first valve 52 and the second valve 62 are used to control the opening and closing of the condenser water outlet 51 and the drain outlet 61, respectively.

[0029] In a preferred implementation of this embodiment, the condensate storage 2 is connected to the nozzle 4 through a pipeline, and a power source 8 is also provided on the pipeline. The power source 8 is a high-pressure water pump. The high-pressure water pump can enhance the impact force of the ejected water on the dirt on the plate 15, thereby enhancing the flushing effect.

[0030] In a preferred implementation of the present embodiment, a liquid level detection device 7 is further provided in the condensed water storage 2, and the liquid level detection device 7 is used to detect the height of the liquid level in the condensed water storage 2. The detection device can detect the liquid level in the condensed water storage 2 to prevent insufficient water in the condensed water storage 2 from affecting normal cleaning; when it is detected that the condensed water in the condensed water storage 2 is insufficient for the nozzle 4 to spray water for cleaning, external water can also be injected into the condensed water storage 2.

[0031] In a preferred implementation manner of this embodiment, a controller 9 is also included. The first valve 52 and the second valve 62 are both electric valves. The controller 9 is signal-connected to the power source 8, the first valve 52, the second valve 62, the liquid level detection device 7 and the pressure difference monitoring device 3 respectively.

[0032] The controller 9 can realize the automatic operation of the device and complete each step, making the use of the device more convenient. Specifically, during operation: when the asymmetric plate heat exchanger 1 is operating normally, the pressure difference monitoring device 3 detects that the pressure difference does not reach the threshold value and transmits it to the controller 9, and the controller 9 controls the first valve 52 to open and the second valve 62 to close, so that the condensed water flows through the drain port 111 and is discharged to the condensed water storage 2 through the condensed water port 51 for storage; when the pressure difference monitoring device 3 detects that the pressure difference between the air inlet 12 and the exhaust port 13 is greater than the threshold value, it sends a signal to the controller 9, and the controller 9 immediately controls the first valve 52 to close and the second valve 62 to open, that is, to close the condensed water port 51 and open the sewage port 61, and then turns on the high-pressure water pump, that is, turns on the power source 8, drives the water in the condensed water storage 2 to spray out from the nozzle 4 and clean the plate 15 forming the heat medium channel 14, and the cleaned dirt can be discharged through the sewage port 61; when the water volume in the condensed water storage 2 is lower than the set value, the liquid level detection device 7 can transmit a signal to the control device, and the staff can replenish water.

[0033] In addition, an alarm system is preferably provided on the controller 9, and when the pressure difference reaches a threshold value, an alarm can be sent to alert the staff; a timing system is preferably provided to set the working time of the power source 8; a low-load monitoring system is preferably provided to monitor the exhaust volume, and cleaning is performed when a small amount of exhaust is detected, so as to avoid affecting the normal exhaust of the process equipment.

[0034] In a preferred implementation of the present embodiment, an overflow pipe 21 is further provided on the condensed water storage 2. The condensed water storage 2 has a water storage space. One end of the overflow pipe 21 is connected and communicated with the side surface near the top of the water storage space, and the other end is not higher than the end of the overflow pipe 21 connected to the water storage space. When the amount of condensed water is large and the water storage space is insufficient to hold it, the water can be discharged through the overflow pipe 21, thereby preventing the condensed water outlet 51 from being unable to drain and causing the condensed water in the asymmetric plate heat exchanger 1 to be unable to be discharged.

[0035] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A flue gas waste heat recovery device, characterized in that: It includes an asymmetric plate heat exchanger, a condensed water storage place and a pressure difference monitoring device, wherein the asymmetric plate heat exchanger has a heat medium channel, and nozzles are arranged at the air inlet and the exhaust port of the heat medium channel, and each nozzle can spray water onto the plate forming the heat medium channel; The heat exchanger is provided with a drain port connected to the heat medium channel, the drain port is connected to both the condensate port and the sewage port, the condensate port, the condensate storage place and the nozzle are connected in sequence, the condensate stored in the condensate storage place is driven by a power source to flow toward the nozzle and spray out from the nozzle, the condensate generated by the asymmetric plate heat exchanger can be discharged through the condensate port, and the sewage generated by cleaning can be discharged through the sewage port; the condensate port and the sewage port can be controlled to open and close respectively; The pressure difference monitoring device has two monitoring ends, and the two monitoring ends are used to monitor the pressure values ​​of the air inlet and the air outlet respectively. The pressure difference between the air inlet and the air outlet can be obtained through the pressure difference monitoring device.

2. The flue gas waste heat recovery device according to claim 1, characterized in that: The top of each of the air inlet and the air outlet is fixedly connected with each of the nozzles.

3. The flue gas waste heat recovery device according to claim 1, characterized in that: It also includes a drain pipe, one end of which is connected to and communicated with the drain outlet, and the other end branches out to form a condensation pipe and a sewage pipe. The pipe opening at one end of the condensation pipe away from the drain outlet is the condensation water outlet, and the pipe opening at one end of the sewage pipe away from the drain outlet is the sewage outlet.

4. The flue gas waste heat recovery device according to claim 3 is characterized in that: The condenser is provided with a first valve, and the drain pipe is provided with a second valve.

5. The flue gas waste heat recovery device according to claim 4, characterized in that: The condensate storage place is connected to the nozzle through a pipeline, and the power source is arranged on the pipeline. The power source is a high-pressure water pump.

6. The flue gas waste heat recovery device according to claim 5, characterized in that: A liquid level detection device is also provided in the condensed water storage place, and the liquid level detection device is used to detect the height of the liquid level in the condensed water storage place.

7. The flue gas waste heat recovery device according to claim 6, characterized in that: It also includes a controller, the first valve and the second valve are both electric valves, and the controller is respectively connected to the power source, the first valve, the second valve, the liquid level detection device and the pressure difference monitoring device through signals.

8. The flue gas waste heat recovery device according to claim 1, characterized in that: An overflow pipe is also provided on the condensed water storage place, and the condensed water storage place has a water storage space. One end of the overflow pipe is connected and communicated with the side near the top of the water storage space, and the other end is not higher than the end of the overflow pipe connected to the water storage space.

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