Heat tracing device for evaporator for preparing potassium chloride by sintering fly ash

Abstract

The utility model discloses a heat tracing device for an evaporator for preparing potassium chloride by sintering fly ash, which comprises a spiral heat tracing pipe arranged on the outer wall of the evaporator in a surrounding manner. The heat tracing pipe is directly or indirectly contacted with the outer wall of the evaporator; one end of the tracing pipe is connected with the steam outlet pipeline, and the other end of the tracing pipe is connected with the steam inlet pipeline; the heat tracing pipe is arranged around the outer wall of the evaporator, and the heat source is introduced into the heat tracing pipe, so that the outer wall of the evaporator can be heated, the temperature difference between the inner wall of the evaporator and the cavity is reduced, the crystallization probability of a solution on the inner wall of the evaporator is reduced, the shutdown cleaning frequency is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of evaporator equipment, in particular to a heating device for an evaporator used for preparing potassium chloride by sintering dust removal ash. Background Art

[0002] The evaporator for preparing agricultural potassium chloride from sintered electrostatic dust is a device used to evaporate the saturated evaporation stock solution, usually used to extract potassium chloride and sodium chloride. It is mainly composed of heating chamber, circulation pipe, separation chamber and other containers (static equipment) and circulation pump, vacuum pump, pump and centrifuge (dynamic equipment) system.

[0003] During the operation, the temperature inside the separation chamber of the evaporator is high, and the water in the solution is heated to water vapor to obtain potassium chloride or sodium chloride with a higher concentration. However, during the operation of the evaporator, since the separation chamber shell is in contact with the external air, the temperature of the inner wall of the shell is lower than the temperature inside the chamber, so crystals appear on the inner wall of the separation chamber shell and stick to the inner wall, requiring shutdown for cleaning, which affects production efficiency. Utility Model Content

[0004] The utility model aims to provide a heating device for an evaporator for preparing potassium chloride by sintering dust removal ash, which can increase the temperature of the inner wall of the evaporator shell, avoid the generation of crystals, and improve production efficiency.

[0005] The utility model adopts the following technical scheme: a heating device for an evaporator for preparing potassium chloride by sintering dust removal ash, comprising a heating pipe arranged around the outer wall of the evaporator, the heating pipe being in a spiral shape;

[0006] The heating pipe is in direct or indirect contact with the outer wall of the evaporator;

[0007] One end of the heating pipe is connected to the steam outlet pipeline, and the other end of the heating pipe is connected to the steam inlet pipeline.

[0008] Furthermore, when the heating pipe is in direct contact with the outer wall of the evaporator, the contact surface between the heating pipe and the evaporator is a plane.

[0009] Furthermore, the cross section of the heating pipe is semicircular.

[0010] Furthermore, when the heating pipe is in indirect contact with the outer wall of the evaporator, a heat conductor is provided between the heating pipe and the outer wall of the evaporator.

[0011] Furthermore, the contact area between the heat conductor and the outer wall of the evaporator is larger than the contact area between the heat tracing pipe and the outer wall of the evaporator.

[0012] Furthermore, the outer wall of the evaporator is covered with a thermal insulation layer, and the heating pipe is located inside the thermal insulation layer.

[0013] Further, the heat tracing pipe is located at the lower part of the evaporator.

[0014] Furthermore, the steam outlet pipeline is located above the steam inlet pipeline.

[0015] The beneficial effects of the utility model are as follows: the utility model heats the outer wall of the evaporator by arranging a heating pipe around the outer wall of the evaporator and introducing a heat source into the heating pipe, thereby reducing the temperature difference between the inner wall of the evaporator and the cavity, reducing the probability of solution crystallization on the inner wall of the evaporator, reducing the frequency of shutdowns for cleaning, and thus improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an evaporator heating device for preparing potassium chloride by sintering dust removal ash according to an embodiment of the utility model;

[0017] Figure 2 The utility model is a schematic diagram of the cross-sectional structure of an evaporator heating device for preparing potassium chloride by sintering dust ash according to an embodiment of the present invention.

[0018] Among them: 10. Evaporator; 20. Steam outlet pipeline; 30. Heating pipe; 40. Steam inlet pipeline. DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0020] The utility model discloses a heating device for an evaporator for preparing potassium chloride by sintering dust removal ash. Figure 1 As shown, it includes a heating pipe 30 that is arranged around the outer wall of the separation chamber of the evaporator 10, and the heating pipe 30 is spiral; the heating pipe 30 is in direct or indirect contact with the outer wall of the evaporator 10; one end of the heating pipe 30 is connected to the steam outlet pipeline 20, and the other end of the heating pipe 30 is connected to the steam inlet pipeline 40.

[0021] The utility model heats the outer wall of the evaporator 10 by surrounding the outer wall of the evaporator 10 with a heating pipe 30 and introducing a heat source into the heating pipe 30, thereby reducing the temperature difference between the inner wall of the evaporator 10 and the cavity, reducing the probability of solution crystallization on the inner wall of the evaporator, reducing the frequency of shutdowns for cleaning, and thus improving production efficiency.

[0022] Specifically, the heat tracing pipe 30 is spirally arranged on the outer wall of the evaporator separation chamber (for the convenience of description, the evaporator separation chamber is referred to as the evaporator below) with a constant pitch, so as to ensure that the outer wall of the evaporator is heated evenly.

[0023] As a specific implementation, when the heat tracing pipe 30 is in direct contact with the outer wall of the evaporator 10, the contact surface between the heat tracing pipe 30 and the evaporator 10 is a plane. Figure 2As shown, the cross section of the heat tracing pipe 30 is semicircular. The contact area between the two can be increased through the contact of the plane, thereby improving the heat conduction efficiency. Since the cross section of the pipeline is usually a circular pipe, in order to increase the contact area between the two as much as possible, a semicircular shape can be used to maximize the contact area between the two.

[0024] In another embodiment, when the heat tracing pipe 30 is in indirect contact with the outer wall of the evaporator 10, a heat conductor is provided between the heat tracing pipe 30 and the outer wall of the evaporator 10. The contact area between the heat conductor and the outer wall of the evaporator 10 is greater than the contact area between the heat tracing pipe 30 and the outer wall of the evaporator 10. By adding a heat conductor between the two, the contact area can be further increased on the basis of the heat tracing pipe 30, thereby improving the heat conduction efficiency.

[0025] More specifically, the heat conductor can be a plate with high thermal conductivity. When the heat source is introduced into the heating pipe 30, the heat is quickly conducted to the plate. Since the contact area between the plate and the outer shell of the evaporator 10 is larger, such as fully covering the outer shell of the evaporator 10, the plate will quickly conduct the heat to every part of the evaporator 10, thereby increasing the temperature of the evaporator 10, making the inner wall temperature consistent with the temperature in the cavity, and avoiding crystallization of substances in the solution.

[0026] In one embodiment, in order to better utilize the heat of the medium in the heat tracing pipe 30, the outer wall of the evaporator 10 is coated with an insulation layer, and the heat tracing pipe 30 is located inside the insulation layer. By providing the insulation layer, the heat of the heat tracing pipe 30 can be better maintained to prevent its heat from dissipating.

[0027] The heating pipe 30 is located at the lower part of the evaporator 10. This is because the evaporator 10 is not fully liquid-filled. Most of the time, the liquid inside is less than 1 / 2. Therefore, in order to avoid waste of materials and heat sources, it is only necessary to set the heating pipe 30 at the lower part of the evaporator 10.

[0028] In one embodiment, the steam outlet pipeline 20 is located above the steam inlet pipeline 40. In this way, the steam can automatically rise in the heat tracing pipe 30 by utilizing the principle that hot gas rises, thereby reducing driving energy.

[0029] It should be noted that in this embodiment, steam is used as a heat source. This is due to the construction environment of this embodiment, and does not mean that steam must be used as a heat source. If necessary, a liquid or solid heat source can also be used to heat the heat tracing pipe 30. For example, hot water can be used to replace steam, and a heating pipe can be used to replace the heat tracing pipe 30, or the two can be combined to achieve heating through electric heating.

[0030] The utility model heat tracing device avoids the situation that the bottom edge of the evaporator separation chamber cannot work continuously due to adhesion, reduces the number of times the staff stops cleaning the bottom edge of the evaporator separation chamber, and also reduces the labor intensity of the staff.

Claims

1. A heating device for an evaporator for preparing potassium chloride from sintered dust ash, characterized in that: It comprises a heat tracing pipe (30) arranged around the outer wall of the evaporator (10), wherein the heat tracing pipe (30) is spiral-shaped; The heat tracing pipe (30) is in direct or indirect contact with the outer wall of the evaporator (10); One end of the heat tracing pipe (30) is connected to the steam outlet pipeline (20), and the other end of the heat tracing pipe (30) is connected to the steam inlet pipeline (40).

2. A heating device for an evaporator for preparing potassium chloride from sintered dust ash as claimed in claim 1, characterized in that: When the heating pipe (30) is in direct contact with the outer wall of the evaporator (10), the contact surface between the heating pipe (30) and the evaporator (10) is a plane.

3. A heating device for an evaporator for preparing potassium chloride from sintered dust as claimed in claim 2, characterized in that: The cross section of the heating pipe (30) is semicircular.

4. A heating device for an evaporator for preparing potassium chloride from sintered dust ash as claimed in claim 1, characterized in that: When the heat tracing pipe (30) is in indirect contact with the outer wall of the evaporator (10), a heat conductor is provided between the heat tracing pipe (30) and the outer wall of the evaporator (10).

5. A heating device for an evaporator for preparing potassium chloride from sintered dust ash as claimed in claim 4, characterized in that: The contact area between the heat conductor and the outer wall of the evaporator (10) is greater than the contact area between the heat tracing pipe (30) and the outer wall of the evaporator (10).

6. A heating device for an evaporator for preparing potassium chloride from sintered dust ash as claimed in claim 2 or 4, characterized in that: The outer wall of the evaporator (10) is covered with a thermal insulation layer, and the heating pipe (30) is located inside the thermal insulation layer.

7. A heating device for an evaporator for preparing potassium chloride from sintered dust ash as claimed in claim 6, characterized in that: The heat tracing pipe (30) is located at the lower part of the evaporator (10).

8. A heating device for an evaporator for preparing potassium chloride from sintered dust ash as claimed in claim 7, characterized in that: The steam outlet pipeline (20) is located above the steam inlet pipeline (40).

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