Heat exchanger, heat exchange system and method for material evaporation and concentration

Abstract

The present invention relates to a heat exchanger, heat exchange system, and method for material evaporation and concentration. The heat exchanger comprises a heat exchange portion, an air inlet portion, and a water outlet portion. The heat exchange portion is provided with a plurality of heat exchange tubes and a steam injection structure. The heat exchanger of the present invention is provided with a steam injection structure. After the heat exchange operation is completed, a cleaning liquid can be injected into the heat exchange portion. Steam ejected by the steam injection structure heats the cleaning liquid and boils and cleans the outer surfaces of the heat exchange tubes, thereby preventing scale accumulation when the heat exchanger is used in a material evaporation and concentration system.

Description

Technical Field

[0001] The present invention relates to the field of waste gas treatment equipment, and in particular to a heat exchanger, a heat exchange system and a method for evaporating and concentrating materials. Background Art

[0002] Currently, the heat exchangers used in systems for material evaporation and concentration are mostly shell-and-tube or plate-type heat exchangers. These typically use steam to indirectly heat the material, evaporating the water and increasing its concentration. In evaporation and concentration equipment using shell-and-tube heat exchangers, the material typically flows through the tube side of the heat exchanger, while the steam flows through the shell side. This heat exchange method can cause scaling in the tubes, making cleaning difficult.

[0003] According to the above, the heat exchange scheme of the existing evaporation and concentration system needs to be further improved. Summary of the Invention

[0004] The first object of the present invention is to overcome the problem that the heat exchanger of the existing evaporation concentration system is difficult to clean, and to provide a heat exchanger with a steam injection structure in the heat exchange part, which can heat the cleaning liquid in the heat exchange part to clean the dirt on the heat exchange tube.

[0005] In order to achieve the above invention objectives, the present invention adopts the following technical solutions:

[0006] A heat exchanger for evaporation and concentration of materials comprises a heat exchange portion, an air inlet portion and a water outlet portion. The heat exchange portion is provided with a plurality of heat exchange tubes and a steam injection structure, and a first interface and a second interface are provided on the outside. The heat exchange tubes longitudinally pass through both ends of the heat exchange portion, and the steam injection structure is connected to an external air supply device through a pipeline; the air inlet portion is provided on the upper side of the heat exchange portion and is provided with an air inlet; the water outlet portion is provided on the lower side of the heat exchange portion and is provided with a water outlet; the heat exchange tubes are connected with the air inlet portion and the water outlet portion to form a first channel for conveying steam; a second channel is formed between the first interface, the heat exchange portion and the second interface for conveying steam or cleaning liquid. After the heat exchange work is completed, the steam injection structure sprays steam to heat the cleaning liquid in the second channel, and the first interface discharges the sewage generated by cleaning.

[0007] The heat exchanger of the present invention is provided with a steam injection structure. After the heat exchange work is completed, a cleaning liquid can be injected into the heat exchange part. The steam ejected by the steam injection structure heats the cleaning liquid and boils and washes the outer surface of the heat exchange tube, so that the heat exchanger will not be scaled when used in a material evaporation and concentration system.

[0008] Furthermore, the outer wall of the heat exchanger is provided with a viewing window, which makes it convenient for the user to observe the dirt and cleaning status of the heat exchange part through the viewing window.

[0009] Furthermore, the steam injection structure is arranged at the bottom of the heat exchange part and includes at least two steam injection ports.

[0010] Furthermore, the interval between the two steam injection ports is about 100 mm.

[0011] Furthermore, the heat exchange tube is a spirally wound tube. This solution enables the material to obtain a larger heat transfer coefficient at a lower flow rate.

[0012] Another object of the present invention is to provide a heat exchange system for evaporation and concentration of materials, including an evaporator and the above-mentioned heat exchanger, the evaporator including a body and a first port and a second port arranged on the body, the first port being connected to a first interface, the second port being connected to a second interface, a material pump and a feed valve being provided on the connecting pipe between the first interface and the first port, the evaporator being provided with a feed port, the feed port being connected to the material, the material pump pumping the material into the pipe, the feed valve controlling the opening and closing of the pipe, a drain branch and a drain valve being provided on the pipe between the feed valve and the first interface, the drain valve being provided on the drain branch.

[0013] Compared with the prior art, the system of the present invention has the advantages of being easy to clean and having high heat exchange efficiency due to the application of the above-mentioned heat exchanger.

[0014] A third object of the present invention is to provide a method for the above-mentioned heat exchange system, comprising a heat exchange process and a cleaning process. The heat exchange process comprises: a. connecting the evaporator to material; b. transferring the material to the second channel of the heat exchanger through the evaporator; the heat exchanger receives the material through the second channel and receives steam through the first channel; v. exchanging heat between the steam and the material within the heat exchange section, with the steam releasing heat to generate condensed water, which is discharged from the water outlet; and absorbing heat from the material to generate a gas-liquid mixture, which is then discharged from the second interface; d. connecting the evaporator to the gas-liquid mixture generated by the heat exchanger, separating the water vapor in the gas-liquid mixture from the concentrated liquid, discharging the steam, and re-transferring the concentrated liquid to the heat exchanger for heat exchange; e. repeating steps b and d until the concentration of the concentrated liquid reaches a predetermined concentration, whereupon the heat exchange process terminates. The cleaning process comprises: connecting the evaporator to a cleaning liquid and transferring it to the heat exchanger; the heat exchanger receives the cleaning liquid through the second channel; the steam ejection structure ejects steam to heat the cleaning liquid to boil off dirt on the heat exchange tubes; and the wastewater generated by the cleaning is discharged from the first interface.

[0015] Compared with the prior art, the method of the present invention has all the advantages of the above-mentioned heat exchange system because it applies the above-mentioned heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a simplified structural diagram of the heat exchanger;

[0017] Figure 2 A simplified structural diagram of the system.

[0018] Description of labels:

[0019] Heat exchanger 1, heat exchange part 11, window 12, air inlet 13, air inlet 131, water outlet 14, water outlet 141, heat exchange tube 15, steam injection structure 16, first interface 17, second interface 18, evaporator 2, first port 21, second port 22, material pump 3, feed valve 4, drain valve 5. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below with reference to the accompanying drawings:

[0021] Example 1:

[0022] This embodiment discloses a heat exchanger 1 for material evaporation and concentration, comprising a heat exchange portion 11, an air inlet portion 13, and a water outlet portion 14. The heat exchange portion 11 is provided with a plurality of heat exchange tubes 15 and a steam injection structure 16. A first port 17 and a second port 18 are provided on the outside of the heat exchange portion 11. The heat exchange tubes 15 longitudinally extend through both ends of the heat exchange portion 11, and the steam injection structure 16 is connected to an external air supply device via a pipeline. The air inlet portion 13 is provided on the upper side of the heat exchange portion 11 and is provided with an air inlet 131. The water outlet portion 14 is provided on the lower side of the heat exchange portion 11 and is provided with a water outlet 141. The heat exchange tubes 15 communicate with the air inlet portion 13 and the water outlet portion 14 to form a first channel for conveying steam. A second channel for conveying steam or cleaning liquid is formed between the first port 17, the heat exchange portion 11, and the second port 18. After the heat exchange operation is completed, the steam injection structure 16 sprays steam to heat the cleaning liquid in the second channel, and the first port 17 discharges wastewater generated by cleaning.

[0023] The outer wall of the heat exchange portion is provided with a viewing window 12 so that the user can observe the cleaning status through the viewing window 12 .

[0024] There are several windows 12 arranged longitudinally, and the horizontal positions of the windows 12 are equidistant from each other. This can reduce the number of windows and reduce heat loss while ensuring that the user can clearly observe the various areas in the heat exchange part through the windows.

[0025] The steam injection structure 16 is disposed at the bottom of the heat exchange portion 11 and includes at least two steam injection ports.

[0026] The distance between the two steam injection ports is about 100 mm.

[0027] The heat exchange tube 15 is a spirally wound tube so that the material can obtain a larger heat transfer coefficient at a lower flow rate.

[0028] The heat exchanger 1 of the present invention is provided with a steam injection structure 16. After the heat exchange operation is completed, a cleaning liquid can be injected into the heat exchange portion 11. Steam ejected from the steam injection structure 16 heats the cleaning liquid and boils and cleans the outer surface of the heat exchange tube 15, thereby preventing scale from accumulating when the heat exchanger 1 is used in a material evaporation and concentration system.

[0029] Example 2:

[0030] This embodiment discloses a heat exchange system for evaporation and concentration of materials, including an evaporator 2 and the above-mentioned heat exchanger 1. The evaporator 2 includes a body and a first port 21 and a second port 22 provided on the body. The first port 21 is connected to the first interface 17, and the second port 22 is connected to the second interface 18. A material pump 3 and a feed valve 4 are provided on the connecting pipe between the first interface 17 and the first port 21. The evaporator 2 is provided with a feed port (not shown in the figure), which is connected to the material. The material pump 3 pumps the material 3 into the pipe. The feed valve 4 controls the opening and closing of the pipe. A drain branch and a drain valve 5 are provided on the pipe between the feed valve 4 and the first interface 17. The drain valve 5 is provided on the drain branch.

[0031] Compared with the prior art, the heat exchange system of this embodiment has the advantages of being easy to clean and having high heat exchange efficiency due to the application of the above-mentioned heat exchanger 1 .

[0032] Example 3:

[0033] This embodiment discloses a method for the above-mentioned heat exchange system, including a heat exchange process and a cleaning process, wherein the heat exchange process includes: a. connecting the evaporator 2 to the material; b. the evaporator 2 transports the material to the second channel of the heat exchanger 1, and the heat exchanger 1 receives the material through the second channel and receives the steam through the first channel; v. the steam and the material exchange heat in the heat exchange part 11, and the steam releases heat to generate condensed water and is discharged from the water outlet 141, and the material absorbs heat to generate a gas-liquid mixture and is then output from the second interface 18; d. the evaporator 2 is connected to the gas-liquid mixture generated by the heat exchanger 1, and the water vapor in the gas-liquid mixture is separated from the concentrated liquid, and the steam is discharged, and the concentrated liquid is re-transported to the heat exchanger for heat exchange; e. repeating steps bd until the concentration of the concentrated liquid reaches a preset concentration, and the heat exchange process ends. The cleaning process includes: the evaporator 2 is connected to the cleaning liquid and transported to the heat exchanger 1. The heat exchanger 1 receives the cleaning liquid through the second channel. The steam injection structure 16 sprays steam to heat the cleaning liquid to boil and wash the dirt on the heat exchange tube 15. The first interface 17 discharges the sewage generated by cleaning.

[0034] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A heat exchanger for evaporation and concentration of materials, characterized in that: include: A heat exchange portion is provided with a plurality of heat exchange tubes and a steam injection structure, and a first interface and a second interface are provided on the outside. The heat exchange tubes longitudinally pass through both ends of the heat exchange portion, and the steam injection structure is connected to an external gas supply device through a pipeline; The air inlet portion is provided on the upper side of the heat exchange portion and is provided with an air inlet; The water outlet portion is provided at the lower side of the heat exchange portion and is provided with a water outlet; The heat exchange tube is connected with the air inlet and the water outlet to form a first channel for conveying steam; a second channel is formed between the first interface, the heat exchange part and the second interface for conveying steam or cleaning liquid. After the heat exchange work is completed, the steam injection structure sprays steam to heat the cleaning liquid in the second channel, and the first interface discharges the sewage generated by cleaning.

2. The heat exchanger according to claim 1, characterized in that: The outer wall of the heat exchange part is provided with a window.

3. The heat exchanger according to claim 1, characterized in that: The steam injection structure is arranged at the bottom of the heat exchange part and includes at least two steam injection ports.

4. The heat exchanger according to claim 3, characterized in that: The distance between the two steam injection ports is about 100 mm.

5. The heat exchanger according to claim 1, characterized in that: The heat exchange tube is a spirally wound tube.

6. A heat exchange system for evaporation and concentration of materials, characterized by: It includes an evaporator and the heat exchanger according to any one of claims 1 to 5, the evaporator includes a body and a first port and a second port arranged on the body, the first port is connected to the first interface, the second port is connected to the second interface, a material pump and a feed valve are provided on the connecting pipe between the first interface and the first port, the evaporator is provided with a feed port, the feed port is connected to the material, the material pump pumps the material into the pipeline, the feed valve controls the opening and closing of the pipeline, a drain branch and a drain valve are provided on the pipeline between the feed valve and the first interface, and the drain valve is provided on the drain branch.

7. The method for the heat exchange system according to claim 6, characterized in that: Including heat exchange process and cleaning process, The heat exchange process includes: a. Evaporator access material; b. The evaporator delivers the material to the second channel of the heat exchanger, and the heat exchanger receives the material through the second channel and receives the steam through the first channel; v. The steam and the material exchange heat in the heat exchange part. The steam releases heat to generate condensed water and is discharged from the water outlet. The material absorbs heat to generate a gas-liquid mixture and is then output from the second interface. d. The evaporator is connected to the gas-liquid mixture produced by the heat exchanger, and the water vapor in the gas-liquid mixture is separated from the concentrated liquid, and the steam is discharged, and the concentrated liquid is re-transported to the heat exchanger for heat exchange; e. Repeat steps bd until the concentration of the concentrated liquid reaches the preset concentration, and the heat exchange process ends; The cleaning process includes: The evaporator is connected to the cleaning liquid and transported to the heat exchanger. The heat exchanger receives the cleaning liquid through the second channel, and the steam injection structure sprays steam to heat the cleaning liquid to boil and wash the dirt on the heat exchange tube, and the first interface discharges the sewage generated by cleaning.

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