Plate heat exchanger self-cleaning system

Abstract

The utility model provides a self-cleaning system for a plate heat exchanger, which relates to the technical field of cooling crystallization and comprises a plate heat exchanger, a crystallizing tank, a closed-loop circulating pipe, a cooling water inlet pipe and a cooling water outlet pipe, the cooling water inlet pipe is communicated with a cleaning water inlet pipe, and one end of the cleaning water inlet pipe is connected with a cleaning pump. The cooling water inlet pipe is communicated with a cleaning pump through a pipeline, the water inlet end of the cleaning pump is connected with a cleaning tank through a pipeline, the cooling water outlet pipe is further communicated with a cleaning water outlet pipe, and the other end of the cleaning water outlet pipe is communicated with the cleaning tank. Traditional manual cleaning is changed into machine automatic cleaning, time and labor are saved, temperature is easy to control, production efficiency is improved, product cost is reduced, and the purposes of saving time and labor and improving working efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the field of cooling crystallization, in particular to a self-cleaning system for a plate heat exchanger. Background Art

[0002] The industrial production of mannitol mainly relies on the method of cooling crystallization to purify and ultimately obtain high-purity mannitol. Mannitol crystallization is the process in which mannitol precipitates from the solution one by one after reaching supersaturation as the temperature changes. The supersaturation mainly depends on the change in temperature. If the temperature changes too quickly, the mannitol content will be low, and if the temperature changes too slowly, the cost will increase.

[0003] In order to accurately control and adjust the temperature of the mannitol crystallization process, the plate heat exchanger plays a vital role. According to the valve opening adjustment, the traditional direct cooling is converted into indirect cooling, and the temperature is easier to control.

[0004] With the widespread application of plate heat exchangers in the field of crystallization, corresponding problems have arisen. During the long-term use of plate heat exchangers, the cooling water contains calcium and magnesium ions. After the cooling water is heated by the closed-loop circulating water in the crystallization tank, the calcium and magnesium ions easily form scale and adhere to the inner wall of the plate heat exchanger. Over a long period of time, the heat exchange effect of the plate heat exchanger is greatly affected.

[0005] When the plate heat exchanger cannot meet the cooling requirements, it must be cleaned manually, piece by piece, which is time-consuming, laborious and the working environment is dirty, so a new cleaning method is needed.

[0006] To this end, the utility model provides a plate heat exchanger self-cleaning system. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides a plate heat exchanger self-cleaning system, which solves the problems raised by the above-mentioned background technology.

[0008] To achieve the above purpose, the utility model is implemented by the following technical solutions: a plate heat exchanger self-cleaning system, comprising a plate heat exchanger and a crystallization tank, the crystallization tank is equipped with a closed-circuit circulation pipe, the plate heat exchanger has two groups of medium channels, each group of the medium channels is provided with a medium inlet and a medium outlet, the plate heat exchanger is connected to the closed-circuit circulation pipe through one group of the medium channels;

[0009] Another group of the medium channels on the plate heat exchanger is connected with a cooling water inlet pipe and a cooling water outlet pipe, the cooling water inlet pipe is also connected with a cleaning inlet pipe, one end of the cleaning inlet pipe is connected with a cleaning pump, the water inlet end of the cleaning pump is connected with a cleaning tank through a pipeline, the cooling water outlet pipe is also connected with a cleaning outlet pipe, and the other end of the cleaning outlet pipe is connected with the cleaning tank.

[0010] As a further technical solution of the utility model, one end of the cooling water outlet pipe is connected to the cooling water inlet pipe through a group of the medium channels on the plate heat exchanger, and a cooling water outlet valve is provided at the other end of the cooling water outlet pipe, and a cooling water inlet valve is provided at the other end of the cooling water inlet pipe.

[0011] As a further technical solution of the utility model, a cleaning water outlet valve is arranged between the cooling water outlet pipe and the cleaning water outlet pipe.

[0012] As a further technical solution of the utility model, a cleaning water inlet valve is arranged between the cooling water inlet pipe and the cleaning water inlet pipe, and the output end of the cleaning pump is connected to the cooling water inlet pipe through the cleaning water inlet pipe.

[0013] The utility model provides a plate heat exchanger self-cleaning system, which has the following beneficial effects compared with the prior art:

[0014] This design of a plate heat exchanger self-cleaning system installs a cleaning system on the cooling water inlet and cooling water outlet pipes of the traditional plate heat exchanger. After the transformation is completed, the traditional manual cleaning is converted into automatic machine cleaning, which saves time and labor, and the temperature is easy to control, thereby improving production efficiency and reducing product costs, achieving the purpose of saving time, labor and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a structural schematic diagram of a plate heat exchanger self-cleaning system.

[0016] In the figure: 1. Plate heat exchanger; 2. Cooling water inlet valve; 3. Cooling water inlet pipe; 4. Cooling water outlet valve; 5. Cooling water outlet pipe; 6. Cleaning tank; 7. Cleaning pump; 8. Cleaning inlet valve; 9. Cleaning inlet pipe; 10. Cleaning outlet valve; 11. Cleaning outlet pipe; 12. Closed-circuit circulation pipe; 13. Crystallization tank. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] See also Figure 1The utility model provides a technical solution for a plate heat exchanger self-cleaning system: a plate heat exchanger self-cleaning system, comprising a plate heat exchanger 1 and a crystallizer 13, a closed-circuit circulation pipe 12 is installed on the crystallizer 13, two groups of medium channels are arranged on the plate heat exchanger 1, each group of medium channels is provided with a medium inlet and a medium outlet, the plate heat exchanger 1 is connected with the closed-circuit circulation pipe 12 through one group of medium channels, during normal operation, the cooling water inlet valve 2 and the cooling water outlet valve 4 are opened, and the cooling water on the plate heat exchanger 1 is used to heat and cool the closed-circuit circulation water of the crystallizer in the closed-circuit circulation pipe 12 on the crystallizer 13;

[0019] Another set of medium channels on the plate heat exchanger 1 is connected with a cooling water inlet pipe 3 and a cooling water outlet pipe 5. One end of the cooling water outlet pipe 5 is connected with the cooling water inlet pipe 3 through a set of medium channels on the plate heat exchanger 1. The cooling water inlet pipe 3 is also connected with a cleaning inlet pipe 9. One end of the cleaning inlet pipe 9 is connected with a cleaning pump 7. A cleaning inlet valve 8 is arranged between the cooling water inlet pipe 3 and the cleaning inlet pipe 9. The output end of the cleaning pump 7 is connected with the cooling water inlet pipe 3 through the cleaning inlet pipe 9. The water inlet end of the cleaning pump 7 is connected with a cleaning tank 6 through a pipeline. The cooling water outlet pipe 5 is also connected with the cleaning outlet pipe 1 1, the other end of the cleaning water outlet pipe 11 is connected with the cleaning tank 6, and the other end of the cooling water outlet pipe 5 is provided with a cooling water outlet valve 4, the other end of the cooling water inlet pipe 3 is provided with a cooling water inlet valve 2, and a cleaning water outlet valve 10 is provided between the cooling water outlet pipe 5 and the cleaning water outlet pipe 11. Through the cooperation of the cooling water inlet pipe 3 and the cooling water outlet pipe 5, a cleaning pipeline is formed with the cleaning water outlet pipe 11 and the cleaning water inlet pipe 9, and then a cleaning tank 6 and a cleaning pump 7 are added to the cleaning pipeline, so as to facilitate the realization of self-cleaning effect, and the scale inhibitor is added in the cleaning tank 6, which can improve the cleaning effect of the plate heat exchanger 1.

[0020] The working principle of the utility model is as follows: when in use, first close the closed-circuit circulating water in the closed-circuit circulating pipe 12 on the crystallization tank 13, configure a certain amount of scale inhibitor in the cleaning tank 6, then close the cooling water inlet valve 2 and the cooling water outlet valve 4, open the cleaning water inlet valve 8 and the cleaning water outlet valve 10, start the cleaning pump 7, and let the cleaning liquid in the cleaning tank 6 circulate in the cleaning pipeline system for about 1 hour;

[0021] Further, the cleaning pump 7, the cleaning water inlet valve 8, and the cleaning water outlet valve 10 are closed at one time, the closed-circuit circulating water in the closed-circuit circulating pipe 12 on the crystallization tank 13 is opened, the cooling water inlet valve 2 and the cooling water outlet valve 4 are opened, and the whole system resumes normal operation;

[0022] When the cooling water inlet pressure is too high or the cooling efficiency of the crystallizer 13 is extremely low, the plate heat exchanger 1 should be cleaned in time, that is, the plate heat exchanger 1 is self-cleaned using the above steps.

[0023] The above is only a preferred embodiment of the present invention. It should be noted that, for ordinary technicians in the technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A plate heat exchanger self-cleaning system, characterized in that: It comprises a plate heat exchanger (1) and a crystallization tank (13), wherein a closed-circuit circulation pipe (12) is installed on the crystallization tank (13), and the plate heat exchanger (1) has two groups of medium channels, each group of the medium channels is provided with a medium inlet and a medium outlet, and the plate heat exchanger (1) is connected to the closed-circuit circulation pipe (12) via one group of the medium channels; Another group of the medium channels on the plate heat exchanger (1) is connected to a cooling water inlet pipe (3) and a cooling water outlet pipe (5); the cooling water inlet pipe (3) is also connected to a cleaning water inlet pipe (9); one end of the cleaning water inlet pipe (9) is connected to a cleaning pump (7); the water inlet end of the cleaning pump (7) is connected to a cleaning tank (6) via a pipeline; the cooling water outlet pipe (5) is also connected to a cleaning water outlet pipe (11); the other end of the cleaning water outlet pipe (11) is connected to the cleaning tank (6).

2. A plate heat exchanger self-cleaning system according to claim 1, characterized in that: One end of the cooling water outlet pipe (5) is connected to the cooling water inlet pipe (3) through a group of medium channels on the plate heat exchanger (1), and the other end of the cooling water outlet pipe (5) is provided with a cooling water outlet valve (4), and the other end of the cooling water inlet pipe (3) is provided with a cooling water inlet valve (2).

3. A plate heat exchanger self-cleaning system according to claim 1, characterized in that: A cleaning water outlet valve (10) is provided between the cooling water outlet pipe (5) and the cleaning water outlet pipe (11).

4. A plate heat exchanger self-cleaning system according to claim 1, characterized in that: A cleaning water inlet valve (8) is provided between the cooling water inlet pipe (3) and the cleaning water inlet pipe (9), and the output end of the cleaning pump (7) is connected to the cooling water inlet pipe (3) via the cleaning water inlet pipe (9).

Images