Mother liquor heat exchanger with cleaning device

Abstract

The utility model relates to the technical field of combined soda production equipment, in particular to a mother liquor heat exchanger with a cleaning device, which is characterized in that a plurality of heat exchange plates are arranged on the wall of a heat exchange tube at intervals, a splitter plate is arranged on the outer side of each heat exchange plate, and spray washing devices are respectively arranged on the heat exchange plates and the splitter plate. A tube pass cleaning pipeline and a shell pass cleaning pipeline are arranged in the water cooling jacket, one end of the tube pass cleaning pipeline sequentially penetrates through the splitter plate and the heat exchange plate to be connected with a tube pass cleaning nozzle, and one end of the shell pass cleaning pipeline penetrates through the splitter plate to be connected with a shell pass cleaning nozzle. The other end of the tube pass cleaning pipeline and the other end of the shell pass cleaning pipeline are connected with the corresponding cleaning liquid containing grooves through the corresponding cleaning pipeline and the circulating pump respectively, the mother liquor heat exchanger tube / shell pass is cleaned through the spray washing device, cleaning is more efficient, the cleaning effect is better, the scabbing problem in the mother liquor heat exchanger tube / shell pass is solved, and long-period stable operation of production is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of combined alkali production equipment, and specifically discloses a mother liquid heat exchanger with a cleaning device. Background Art

[0002] In the production of soda ash, Ca in the mother liquor system 2+ Mg 2+ Easy to use CaCO 3 MgCO 3 The deposits are attached to the inner walls of equipment and pipelines in the form of particles. The tube and shell sides of the mother liquid heat exchanger are severely scarred, which reduces the diameter of the pipeline and affects the normal delivery and cold recovery of the mother liquid. Every year, due to the limited delivery of the mother liquid, the system is forced to reduce the load or stop, which restricts the long-term stable operation of the production.

[0003] The current alkali-fired mother liquor heat exchanger is designed with an acid cleaning process, but since waste acid is difficult to handle and the acid cleaning effect is poor, acid cleaning is basically not used in the alkali-fired industry. In the past, the mother liquor heat exchanger could only be dredged by a water jet during shutdown and maintenance, but this method consumes a lot of manpower and material resources. Document No. CN210664122 discloses a mother liquor heat exchanger cleaning device, including a tube side cleaning pipeline and a shell side cleaning pipeline. During annual maintenance or when the mother liquor exchanger tube and / or shell side needs to be cleaned, the circulating water in the corresponding hot water tank is heated, and then the control valve of the tube / shell side cleaning pipeline is opened to allow the heated circulating water to enter the tube and / or shell side water inlet of the mother liquor heat exchanger unit to clean the pipeline. The circulating water after cleaning the pipeline returns to the corresponding hot water tank through the tube and / or shell side outlet, and the purpose of cleaning the mother liquor heat exchanger unit is achieved by repeated cycles. However, this cleaning method takes a long time and the cleaning effect is average. Utility Model Content

[0004] In order to solve the problems in the background technology, the utility model discloses a mother liquid heat exchanger with a cleaning device. Spray cleaning devices are respectively arranged on the heat exchange plate and the diverter plate, which has a good cleaning effect, solves the scarring problem in the tube / shell of the mother liquid heat exchanger, and ensures stable operation of the production over a long period of time.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A mother liquid heat exchanger with a cleaning device comprises a heat exchanger cylinder, in which a plurality of heat exchange tubes arranged axially along the heat exchanger cylinder are arranged at intervals, a plurality of slots are provided on the wall of the heat exchange tube at intervals along the axial direction, a heat exchange plate is inserted in the slot, a diverter plate is fixedly connected to the outer side of the heat exchange plate, the diverter plate is detachably connected to the heat exchanger cylinder, a spray device is respectively arranged on the heat exchange plate and the diverter plate, the spray device comprises a tube-side cleaning nozzle arranged on the inner side of the heat exchange plate and facing the central axis of the heat exchange tube, and a shell-side cleaning nozzle arranged on the outer side of the diverter plate and facing the inner wall of the heat exchanger cylinder, a water cooling jacket extending along the axial direction of the heat exchange tube is attached to the outside of the heat exchange tube, a cavity is respectively arranged in the heat exchange plate and the diverter plate, and the cavity of the heat exchange plate and the diverter plate are connected to each other. The cavities are connected, and the diverter plate cavity is connected with the inner cavity of the water-cooling jacket through a water pipe. The inner cavity of the water-cooling jacket is connected with a suction pump arranged outside the heat exchanger cylinder through a pipeline. Independently arranged tube-side cleaning pipelines and shell-side cleaning pipelines are also provided in the water-cooling jacket. One end of the tube-side cleaning pipeline passes through the diverter plate and the heat exchange plate in turn to be connected with the tube-side cleaning nozzle, and the other end of the tube-side cleaning pipeline is connected with the liquid outlet end of the first circulation pump arranged outside the heat exchanger cylinder through the tube-side cleaning pipeline. One end of the shell-side cleaning pipeline passes through the diverter plate to be connected with the shell-side cleaning nozzle, and the other end of the shell-side cleaning pipeline is connected with the liquid outlet end of the second circulation pump arranged outside the heat exchanger cylinder through the shell-side cleaning pipeline. The liquid inlets of the first circulation pump and the second circulation pump are respectively connected with corresponding cleaning liquid holding tanks.

[0007] Furthermore, in the mother liquid heat exchanger with a cleaning device, the interface between the heat exchange plate and the slot wall is a matching concave-convex joint surface, and a seal is provided at the interface between the heat exchange plate and the slot.

[0008] Furthermore, in the mother liquid heat exchanger with a cleaning device, the tube-side cleaning nozzle and the shell-side cleaning nozzle are both high-pressure nozzles.

[0009] Furthermore, the mother liquid heat exchanger with a cleaning device is provided with a first high-pressure nozzle controller at a position adjacent to the first circulation pump on the tube-side cleaning pipeline.

[0010] Furthermore, the mother liquid heat exchanger with a cleaning device is provided with a second high-pressure nozzle controller at a position adjacent to the second circulation pump on the shell-side cleaning pipeline.

[0011] Furthermore, the mother liquid heat exchanger with a cleaning device is provided with a plurality of heat sinks at intervals on the inner side of the heat exchange plate, and the heat sinks are made of aluminum.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model discloses a mother liquid heat exchanger with a cleaning device, wherein a plurality of slots are provided at intervals along the axial direction on the wall of the heat exchange tube, a heat exchange plate is inserted in the slot, a diverter plate is fixedly connected to the outer side of the heat exchange plate, and a spray cleaning device is respectively provided on the heat exchange plate and the diverter plate, and the spray cleaning device comprises a tube-side cleaning nozzle arranged on the inner side of the heat exchange plate toward the central axis of the heat exchange tube and a shell-side cleaning nozzle arranged on the outer side of the diverter plate toward the inner wall of the heat exchanger cylinder, cavities are respectively provided in the heat exchange plate and the diverter plate, the heat exchange plate cavity is connected with the diverter plate cavity, the diverter plate cavity is connected with the inner cavity of the water cooling jacket through a water pipe, the inner cavity of the water cooling jacket is connected with a suction pump arranged outside the heat exchanger cylinder through a pipeline, and a water cooling device is also respectively provided in the water cooling jacket. There are tube-side cleaning pipelines and shell-side cleaning pipelines. One end of the tube-side cleaning pipeline passes through the diverter plate and the heat exchange plate in sequence to be connected to the tube-side cleaning nozzle, and the other end of the tube-side cleaning pipeline is connected to the liquid outlet end of the first circulation pump arranged outside the heat exchanger cylinder through the tube-side cleaning pipeline. One end of the shell-side cleaning pipeline passes through the diverter plate to be connected to the shell-side cleaning nozzle, and the other end of the shell-side cleaning pipeline is connected to the liquid outlet end of the second circulation pump arranged outside the heat exchanger cylinder through the shell-side cleaning pipeline. The liquid inlet ends of the first circulation pump and the second circulation pump are respectively connected to the corresponding cleaning liquid containing tanks. The mother liquid heat exchanger tube / shell side is cleaned by the spray cleaning device, which is more efficient and has a better cleaning effect, solves the scarring problem in the mother liquid heat exchanger tube / shell side, and ensures stable operation over a long production period. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 or the description of the prior art 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 labor.

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the mother liquid heat exchanger with a cleaning device of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the heat exchange tube in the utility model;

[0017] In the above figure: 1-upper head; 2-heat exchanger cylinder; 3-heat exchange tube; 3.1-shell; 3.2-diverter plate; 3.3-heat exchange plate; 3.4-shell side cleaning nozzle; 3.5-tube side cleaning nozzle; 3.6-heat sink; 3.7-seal; 3.8-water pipe; 3.9-water cooling jacket; 4-baffle; 5-lower head. DETAILED DESCRIPTION

[0018] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0019] The following is combined with Figure 1 and 2, the utility model is described in detail. A mother liquid heat exchanger with a cleaning device comprises a heat exchanger barrel 2, an upper head 1 is arranged at the upper end of the heat exchanger barrel 2, a lower head 5 is arranged at the upper end of the heat exchanger barrel 2, a plurality of baffles 4 are arranged at intervals along the axial direction of the heat exchanger barrel 2, the baffles 4 are arranged in a staggered manner, a plurality of vertically arranged heat exchange tubes 3 are arranged at intervals in the heat exchanger barrel 2, the heat exchange tubes 3 extend axially along the heat exchanger barrel 2, the heat exchange tubes 3 pass through the baffles 4, the heat exchanger barrel 2, the upper head 1 and the lower head 5 are all provided with fluid inlet and outlet pipe ports, the heat exchange tube 3 comprises a tubular hollow shell 3.1 with openings at both ends, and in the shell A plurality of slots are provided on the wall 3.1 along the axial direction at intervals, and a heat exchange plate 3.3 is inserted in the slots. A diverter plate 3.2 is fixedly connected to the outer side of the heat exchange plate 3.3. The diverter plate 3.2 and the heat exchanger barrel 2 are detachably connected via a flange. A plurality of heat sinks 3.6 are also provided at intervals on the inner side of the heat exchange plate 3.3. At least one tube-side cleaning nozzle 3.5 is provided on the inner side of the heat exchange plate 3.3 and is arranged toward the central axis of the heat exchange tube 3. At least one shell-side cleaning nozzle 3.4 is provided on the outer side of the diverter plate 3.2 and is arranged toward the inner wall of the heat exchanger barrel 2. The tube-side cleaning nozzles 3.5 and the shell-side cleaning nozzles 3.4 at different heights are staggered respectively. The tube cleaning nozzle 3.5 and the shell cleaning nozzle 3.4 are both high-pressure nozzles. A water cooling jacket 3.9 extending along the axial direction is attached to the outside of the heat exchange tube 3. A cavity is provided in the heat exchange plate 3.3 and the diverter plate 3.2 respectively. The cavity of the heat exchange plate 3.3 is connected with the cavity of the diverter plate 3.2. The cavity of the diverter plate 3.2 is connected with the inner cavity of the water cooling jacket 3.9 through a water pipe 3.8. The inner cavity of the water cooling jacket 3.9 is connected with a suction pump provided outside the heat exchanger cylinder 2 through a pipeline. The suction pump pressurizes the water in the water cooling jacket 3.9 into the inner cavities of the diverter plate 3.2 and the heat exchange plate 3.3. In this way, the diverter plate 3.2 and the heat exchange plate 3.3 can transfer the heat exchanger to the inner cavity of the diverter plate 3.2 and the heat exchange plate 3.3. The heat exchanger fin 6, the fluid in the heat exchange tube 3 and the shell 3.1 are cooled, and the temperature of the heat exchange tube 3 and the fluid in the tube is rapidly reduced, so as to avoid the problem of reduced service life of the heat exchange tube 3 due to the small heat exchange area, thereby increasing the service life of the equipment. The water cooling jacket is also provided with an independent tube cleaning pipeline and a shell cleaning pipeline. One end of the tube cleaning pipeline passes through the diverter plate 3.2 and the heat exchange plate 3.3 in turn and is connected to the tube cleaning nozzle 3.5. The other end of the tube cleaning pipeline is connected to the liquid outlet end of the first circulation pump arranged outside the heat exchanger cylinder 2 through the tube cleaning pipeline. One end of the shell cleaning pipeline passes through the diverter plate 3.2 and the shell cleaning nozzle 3.4, the other end of the shell side cleaning pipeline is connected to the liquid outlet end of the second circulating pump arranged outside the heat exchanger cylinder 2 through the shell side cleaning pipeline, and the liquid inlet ends of the first circulating pump and the second circulating pump are respectively connected to the corresponding cleaning liquid holding tanks. It should be noted here that the shell side cleaning pipeline, tube side cleaning pipeline, suction pump, cleaning liquid holding tank, first circulating pump and second circulating pump arranged outside the heat exchanger cylinder 2 are not shown in the figure. The connection between the cleaning liquid holding tank and the circulating pump and the connection between the circulating pump and the pipeline adopts the existing technology, so it is not repeated here;.

[0020] When working, the suction pump pressurizes the water in the water cooling jacket 3.9 to the inner cavity of the diverter plate 3.2 and the heat exchange plate 3.3. The diverter plate 3.2 and the heat exchange plate 3.3 can cool the heat sink 6, the fluid in the heat exchange tube 3 and the shell 3.1. The temperature of the heat exchange tube 3 and the fluid in the heat exchange tube 3 drops rapidly. After absorbing heat, the water returns to the water cooling jacket 3.9. The heat is dissipated by the heat sink arranged in the water cooling jacket 3.9, avoiding the problem of reduced service life of the heat exchange tube 3 due to the small heat exchange area, thereby increasing the service life of the equipment.

[0021] During annual maintenance or when the mother liquid heat exchanger tube needs to be cleaned, the cleaning liquid in the mother liquid heat exchanger tube cleaning liquid storage tank is sequentially sent to the tube cleaning pipeline, the tube cleaning pipeline in the water cooling jacket, the splitter plate 3.2 and the heat exchange plate 3.3 through the first circulation pump, and finally sprayed out from the tube cleaning nozzle 3.5 to clean the mother liquid heat exchanger tube. The cleaning liquid after cleaning the tube returns to the mother liquid heat exchanger tube cleaning liquid storage tank through the tube outlet. This cycle is repeated to achieve the purpose of cleaning the mother liquid heat exchanger.

[0022] During annual maintenance or when the shell side of the mother liquid heat exchanger needs to be cleaned, the cleaning liquid in the shell side cleaning liquid storage tank of the mother liquid heat exchanger is sequentially sent to the shell side cleaning pipeline, the shell side cleaning pipeline in the water cooling jacket and the splitter plate 3.2 through the second circulation pump, and finally sprayed out from the shell side cleaning nozzle 3.4 to clean the shell side of the mother liquid heat exchanger. The cleaning liquid after cleaning the shell side returns to the shell side cleaning liquid storage tank of the mother liquid heat exchanger through the shell side liquid outlet. This cycle is repeated to achieve the purpose of cleaning the mother liquid heat exchanger.

[0023] As an optional design, the mother liquid heat exchanger with a cleaning device is preferably, the interface between the heat exchange plate 3.3 and the slot wall is a matching concave-convex joint surface, and a seal 3.7 is provided at the interface between the heat exchange plate 3.3 and the slot wall, and the seal 3.7 is made of fluororubber or EPDM rubber, which has good elasticity and corrosion resistance.

[0024] As an optional design, the mother liquor heat exchanger with a cleaning device is preferably provided with a first high-pressure nozzle controller at a position adjacent to the first circulation pump on the tube-side cleaning pipeline. The high-pressure nozzle controller is an electronic electric single-seat sleeve-type regulating valve. The tube-side cleaning nozzle 3.5 is controlled by the first high-pressure nozzle controller. During installation, the inclination angle of the nozzle can be adjusted as needed to achieve a better spraying effect.

[0025] As an optional design, the mother liquor heat exchanger with a cleaning device is preferably provided with a second high-pressure nozzle controller at a position adjacent to the second circulation pump on the shell-side cleaning pipeline. The high-pressure nozzle controller is an electronic electric single-seat sleeve-type regulating valve. The shell-side cleaning nozzle 3.4 is controlled by the second high-pressure nozzle controller. During installation, the inclination angle of the nozzle can be adjusted as needed to achieve a better spraying effect.

[0026] The working process of the utility model is as follows:

[0027] When working, the suction pump pressurizes the water in the water cooling jacket 3.9 to the inner cavity of the splitter plate 3.2 and the heat exchange plate 3.3. The splitter plate 3.2 and the heat exchange plate 3.3 can cool the heat sink 6, the fluid in the heat exchange tube 3 and the shell 3.1. The temperature of the heat exchange tube 3 and the fluid in the heat exchange tube 3 drops rapidly, avoiding the problem of reduced service life of the heat exchange tube 3 due to a small heat exchange area, thereby increasing the service life of the equipment;

[0028] During annual maintenance or when the mother liquid heat exchanger tube needs to be cleaned, the cleaning liquid in the mother liquid heat exchanger tube cleaning liquid storage tank is sequentially sent to the tube cleaning pipeline, the tube cleaning pipeline in the water cooling jacket, the splitter plate 3.2 and the heat exchange plate 3.3 through the first circulation pump, and finally sprayed out from the tube cleaning nozzle 3.5 to clean the mother liquid heat exchanger tube. The cleaning liquid after cleaning the tube returns to the mother liquid heat exchanger tube cleaning liquid storage tank through the tube outlet. This cycle is repeated to achieve the purpose of cleaning the mother liquid heat exchanger.

[0029] During annual maintenance or when the shell side of the mother liquid heat exchanger needs to be cleaned, the cleaning liquid in the shell side cleaning liquid storage tank of the mother liquid heat exchanger is sequentially sent to the shell side cleaning pipeline, the shell side cleaning pipeline in the water cooling jacket and the splitter plate 3.2 through the second circulation pump, and finally sprayed out from the shell side cleaning nozzle 3.4 to clean the shell side of the mother liquid heat exchanger. The cleaning liquid after cleaning the shell side returns to the shell side cleaning liquid storage tank of the mother liquid heat exchanger through the shell side liquid outlet. Such a cycle is repeated to achieve the purpose of cleaning the mother liquid heat exchanger, solve the problem of scarring in the mother liquid heat exchanger tube / shell side, and does not affect the joint alkali production and annual maintenance progress;

[0030] Here, it should be noted that the tube side and shell side of the mother liquid heat exchanger can be cleaned at the same time or separately. The cleaning liquid after cleaning the tube side and / or shell side is sampled at a certain interval and T in the cleaning liquid is detected. CL 、FNH3 , C NH3 , CO 2 Content, when CO 2 If the content is greater than 40tt or other indicators are greater than 60tt, new cleaning solution needs to be injected and analyzed twice in succession. CL 、F NH3 , C NH3 , CO 2 The content does not increase, the mother liquor heat exchanger is cleaned, the cleaning effect is better, and the cleaning efficiency is higher.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A mother liquid heat exchanger with a cleaning device, comprising a heat exchanger cylinder, in which a plurality of heat exchange tubes arranged along the axial direction of the heat exchanger cylinder are arranged at intervals, wherein: A plurality of slots are arranged at intervals on the wall of the heat exchange tube, and the slots are spaced apart along the axial direction of the heat exchange tube. A heat exchange plate is inserted in the slot, and a diverter plate is fixedly connected to the outer side of the heat exchange plate, and the diverter plate is detachably connected to the heat exchanger barrel. Spraying devices are respectively arranged on the heat exchange plate and the diverter plate, and the spraying devices include a tube-side cleaning nozzle arranged on the inner side of the heat exchange plate and facing the central axis of the heat exchange tube, and a shell-side cleaning nozzle arranged on the outer side of the diverter plate and facing the inner wall of the heat exchanger barrel. A water-cooling jacket extending along the axial direction of the heat exchange tube is attached to the outside of the heat exchange tube, and cavities are respectively arranged in the heat exchange plate and the diverter plate, and the heat exchange plate cavity is connected to the diverter plate cavity, and the diverter plate cavity is connected to the water-cooling jacket through a water pipe. The inner cavity of the water-cooling jacket is connected, and the inner cavity of the water-cooling jacket is connected with the suction pump arranged outside the heat exchanger cylinder through a pipeline. A tube-side cleaning pipeline and a shell-side cleaning pipeline are also respectively arranged in the water-cooling jacket. One end of the tube-side cleaning pipeline passes through the diverter plate and the heat exchange plate in sequence to be connected with the tube-side cleaning nozzle, and the other end of the tube-side cleaning pipeline is connected with the liquid outlet end of the first circulation pump arranged outside the heat exchanger cylinder through the tube-side cleaning pipeline, one end of the shell-side cleaning pipeline passes through the diverter plate to be connected with the shell-side cleaning nozzle, and the other end of the shell-side cleaning pipeline is connected with the liquid outlet end of the second circulation pump arranged outside the heat exchanger cylinder through the shell-side cleaning pipeline, and the liquid inlet ends of the first circulation pump and the second circulation pump are respectively connected with the corresponding cleaning liquid containing tanks.

2. The mother liquid heat exchanger with a cleaning device according to claim 1, characterized in that: The connecting surface between the heat exchange plate and the slot wall is a concave-convex joint surface that is arranged in a matching manner, and a sealing member is arranged at the connecting surface between the heat exchange plate and the slot.

3. The mother liquid heat exchanger with a cleaning device according to claim 1 or 2, characterized in that: Both the tube side cleaning nozzles and the shell side cleaning nozzles are high pressure nozzles.

4. The mother liquid heat exchanger with a cleaning device according to claim 3 is characterized in that: A first high-pressure nozzle controller is arranged on the pipe cleaning pipeline adjacent to the first circulation pump.

5. The mother liquid heat exchanger with a cleaning device according to claim 3, characterized in that: A second high-pressure nozzle controller is arranged on the shell-side cleaning pipeline at a position adjacent to the second circulation pump.

6. The mother liquid heat exchanger with a cleaning device according to claim 3, characterized in that: A plurality of heat sinks are arranged at intervals on the inner side of the heat exchange plate.

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