Caustic soda concentration double-effect secondary steam recycling system

Abstract

The utility model discloses a piece alkali concentration two -effect two -time steam recycling system, and two -effect heat exchanger's material inlet communicates with material input pipeline, and two -effect heat exchanger's material outlet communicates with two -effect evaporation chamber's material inlet, and two -effect evaporation chamber's material outlet communicates with the material inlet of final heat exchanger, and the material outlet of final heat exchanger communicates with the material inlet of final evaporation chamber, and the material outlet of final evaporation chamber communicates with the inlet of flash tank, and the steam outlet of final evaporation chamber communicates with the steam inlet of two -effect heat exchanger, and the steam outlet of two -effect heat exchanger communicates with the hot medium inlet of surface condenser, and the hot medium outlet of surface condenser communicates with the inlet pipeline of condensate recovery tank, and the water outlet of sewage adjusting pool is connected with the inlet pipeline of self -induction jar, and the outlet of self -induction jar communicates with the cold medium inlet pipeline of surface condenser through circulating pump, and the cold medium outlet of surface condenser is connected with the inlet pipeline of radiator, and the radiator is placed in sewage adjusting pool.

Description

Technical Field

[0001] This utility model relates to the field of caustic soda production technology, specifically to a caustic soda concentration and secondary steam recovery and utilization system. Background Technology

[0002] The production process of caustic soda flakes is relatively complex. First, caustic soda is processed and purified, then placed in a reactor for reaction. The resulting solution is sent to a double-effect heat exchanger for evaporation, then concentrated in a double-effect concentrator before being sent to a final concentrator. The secondary steam from the final concentrator enters the double-effect heat exchanger for heat exchange, and the resulting product is sent to a flash tank. After subsequent cooling and solidification treatment, flaky caustic soda flakes are finally obtained.

[0003] In the production of caustic soda flakes, the secondary steam from the final concentrator enters the double-effect heat exchanger for heat exchange, and the excess is discharged into the atmosphere through the venting pipeline, resulting in water waste. The secondary steam emission is 2.57 t / h. At the same time, the wastewater generated in the production of caustic soda flakes needs to be sent to the wastewater treatment system for purification. In order to ensure the optimal permeability of the reverse osmosis membrane, the temperature of the wastewater is usually between 20℃ and 30℃. However, the temperature is low in winter in northern my country, resulting in the temperature of the wastewater being too low, which is not conducive to the treatment of wastewater. Utility Model Content

[0004] The purpose of this invention is to provide a two-effect secondary steam recovery and utilization system for caustic soda concentration.

[0005] This utility model is implemented by the following technical solution: a caustic soda concentration double-effect secondary steam recovery and utilization system, which includes a double-effect concentrator, a final concentrator, a flash tank, a surface condenser, a condensate recovery tank, and a wastewater equalization tank;

[0006] The double-effect concentrator includes a double-effect evaporation chamber and a double-effect heat exchanger;

[0007] The final concentrator includes a final evaporation chamber and a final heat exchanger;

[0008] The material inlet of the double-effect heat exchanger is connected to the material input pipeline; the material outlet of the double-effect heat exchanger is connected to the material inlet of the double-effect evaporation chamber; the material outlet of the double-effect evaporation chamber is connected to the material inlet of the final heat exchanger; the material outlet of the final heat exchanger is connected to the material inlet of the final evaporation chamber; the material outlet of the final evaporation chamber is connected to the inlet of the flash tank; the steam outlet of the final evaporation chamber is connected to the steam inlet of the double-effect heat exchanger; the steam outlet of the double-effect heat exchanger is connected to the heat medium inlet of the surface condenser; and the heat medium outlet of the surface condenser is connected to the inlet pipeline of the condensate recovery tank.

[0009] The outlet of the wastewater equalization tank is connected to the inlet pipeline of the self-priming tank. The outlet of the self-priming tank is connected to the cold medium inlet pipeline of the surface condenser through a circulation pump. The cold medium outlet of the surface condenser is connected to the inlet pipeline of the radiator. The radiator is placed inside the wastewater equalization tank.

[0010] Furthermore, the radiator is a coil.

[0011] Furthermore, the outlet of the wastewater equalization tank is connected to the inlet of the wastewater treatment system via a pipeline.

[0012] Furthermore, the walls of the wastewater equalization tank are equipped with level gauges and temperature sensors.

[0013] Furthermore, a sewage inlet pipe is connected between the cold medium outlet of the surface condenser and the inlet of the radiator.

[0014] Furthermore, a temporary sewage discharge pipe is connected between the sewage inlet pipe and the inlet of the radiator.

[0015] The advantages of this invention are as follows: The steam discharged from the steam outlet of the double-effect heat exchanger is sent to the surface condenser, where it exchanges heat with the sewage in the sewage equalization tank. After the sewage is heated, part of the steam is condensed into condensate and discharged into the condensate recovery tank through the heat medium outlet of the surface condenser. The sewage is then sent to the radiator after heating, which heats the sewage in the sewage equalization tank, ensuring that the sewage temperature meets the operating temperature requirements of the subsequent sewage treatment system. The heat in the steam is used to heat the sewage, and the condensate is recovered to the sewage equalization tank, thus saving water resources and heat energy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a system flowchart of the utility model;

[0018] In the picture:

[0019] 1. Double-effect concentrator, 1.1. Double-effect evaporator chamber, 1.2. Double-effect heat exchanger, 2. Final concentrator, 2.1. Final evaporator chamber, 2.2. Material input pipeline, 3. Flash tank, 4. Surface condenser, 5. Condensate recovery tank, 6. Self-priming tank, 7. Circulating pump, 8. Radiator, 9. Wastewater equalization tank, 10. Wastewater treatment system, 11. Wastewater inlet pipe, 12. Temporary wastewater discharge pipe, 13. Level gauge, 14. Temperature sensor. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 As shown, the caustic soda concentration double-effect secondary steam recovery and utilization system includes a double-effect concentrator 1, a final concentrator 2, a flash tank 4, a surface cooler, a condensate recovery tank 6, and a wastewater equalization tank 10.

[0022] The double-effect concentrator 1 includes a double-effect evaporation chamber 1.1 and a double-effect heat exchanger 1.2;

[0023] The final concentrator 2 includes a final evaporation chamber 2.1 and a final heat exchanger 2.2;

[0024] The material inlet of the double-effect heat exchanger 1.2 is connected to the material input pipeline 3, the material outlet of the double-effect heat exchanger 1.2 is connected to the material inlet of the double-effect evaporation chamber 1.1, the material outlet of the double-effect evaporation chamber 1.1 is connected to the material inlet of the final heat exchanger 2.2, the material outlet of the final heat exchanger 2.2 is connected to the material inlet of the final evaporation chamber 2.1, the material outlet of the final evaporation chamber 2.1 is connected to the inlet of the flash tank 4, the steam outlet of the final evaporation chamber 2.1 is connected to the steam inlet of the double-effect heat exchanger 1.2, the steam outlet of the double-effect heat exchanger 1.2 is connected to the heat medium inlet of the surface condenser 5, and the heat medium outlet of the surface condenser 5 is connected to the inlet pipeline of the condensate recovery tank 6.

[0025] The outlet of the wastewater equalization tank 10 is connected to the inlet pipeline of the self-priming tank 7. The outlet of the self-priming tank 7 is connected to the cold medium inlet pipeline of the surface condenser 5 through the circulation pump 8. The cold medium outlet of the surface condenser 5 is connected to the inlet pipeline of the radiator 9. The radiator 9 is placed inside the wastewater equalization tank 10. The radiator 9 is used to heat the wastewater in the wastewater equalization tank 10 so that the temperature of the wastewater in the wastewater equalization tank 10 meets the temperature requirements of the subsequent wastewater treatment system 11.

[0026] Furthermore, radiator 9 is a coil, which increases the contact area with sewage.

[0027] Furthermore, the outlet of the wastewater equalization tank 10 is connected to the inlet of the wastewater treatment system 11 via a pipeline.

[0028] Furthermore, a sewage inlet pipe 12 is connected between the cold medium outlet of the surface condenser 5 and the inlet of the radiator 9. Sewage generated during the production process enters the pipeline through the sewage inlet pipe 12, mixes with the heat exchanged sewage in the pipe, and is then sent to the sewage regulating tank 10.

[0029] Furthermore, a temporary sewage discharge pipe 13 is connected between the sewage inlet pipe 12 and the inlet of the radiator 9.

[0030] Furthermore, the wastewater equalization tank 10 is equipped with a level gauge 14 and a temperature sensor 15 on its walls. The level gauge 14 is used to detect the actual amount of wastewater in the wastewater equalization tank 10. When the level is high, the wastewater is discharged from the temporary wastewater discharge pipe 13. The temperature sensor 15 is used to detect the temperature value inside the wastewater equalization tank 10. When the temperature reaches the requirements of subsequent processes, the wastewater is discharged to the wastewater treatment system 11.

[0031] The specific operation process of this embodiment is as follows:

[0032] 50% sodium hydroxide is sent to the double-effect heat exchanger 1.2 via material input pipeline 3. The heating steam used in the double-effect heat exchanger 1.2 is the steam discharged from the final evaporation chamber 2.1. The heating steam is used to heat the raw material sodium hydroxide in the double-effect heat exchanger 1.2. The steam discharged from the steam outlet of the double-effect heat exchanger 1.2 contains a certain amount of heat. This part of the steam is sent to the surface condenser 5, where it exchanges heat with the sewage in the sewage equalization tank 10. After the sewage is heated, part of the steam is condensed into condensate and discharged to the condensate recovery tank 6 through the heat medium outlet of the surface condenser 5. The sewage is then sent to the radiator 9, which heats the sewage in the sewage equalization tank 10 so that the temperature of the sewage meets the temperature requirements of the subsequent sewage treatment system 11. The temperature of the sewage equalization tank 10 is detected by the temperature sensor 15. The temperature of the sewage in the sewage equalization tank 10 is controlled by controlling the amount of sewage entering the surface condenser 5 or the flow rate of steam.

[0033] After heat exchange in the double-effect heat exchanger 1.2, the raw material is sent to the double-effect evaporation chamber 1.1. After further evaporation in the double-effect evaporation chamber 1.1, the raw material is sent to the final heat exchanger 2.2 and the final evaporation chamber 2.1. Under the action of the final heat exchanger 2.2 and the final evaporation chamber 2.1, the prepared raw material is sent to the flash tank 4.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A caustic soda concentration and secondary steam recovery system, characterized in that, It includes a double-effect concentrator, a final concentrator, a flash tank, a surface condenser, a condensate recovery tank, and a wastewater equalization tank; The double-effect concentrator includes a double-effect evaporation chamber and a double-effect heat exchanger; The final concentrator includes a final evaporation chamber and a final heat exchanger; The material inlet of the double-effect heat exchanger is connected to the material input pipeline; the material outlet of the double-effect heat exchanger is connected to the material inlet of the double-effect evaporation chamber; the material outlet of the double-effect evaporation chamber is connected to the material inlet of the final heat exchanger; the material outlet of the final heat exchanger is connected to the material inlet of the final evaporation chamber; the material outlet of the final evaporation chamber is connected to the inlet of the flash tank; the steam outlet of the final evaporation chamber is connected to the steam inlet of the double-effect heat exchanger; the steam outlet of the double-effect heat exchanger is connected to the heat medium inlet of the surface condenser; and the heat medium outlet of the surface condenser is connected to the inlet pipeline of the condensate recovery tank. The outlet of the wastewater equalization tank is connected to the inlet pipeline of the self-priming tank. The outlet of the self-priming tank is connected to the cold medium inlet pipeline of the surface condenser through a circulation pump. The cold medium outlet of the surface condenser is connected to the inlet pipeline of the radiator. The radiator is placed inside the wastewater equalization tank.

2. The caustic soda concentration and secondary steam recovery system according to claim 1, characterized in that, The radiator is a coil.

3. The caustic soda concentration and secondary steam recovery system according to claim 2, characterized in that, The outlet of the wastewater equalization tank is connected to the inlet of the wastewater treatment system via a pipeline.

4. The caustic soda concentration and secondary steam recovery system according to claim 3, characterized in that, The wastewater equalization tank is equipped with a level gauge and a temperature sensor on its walls.

5. The caustic soda concentration and secondary steam recovery system according to claim 4, characterized in that, A sewage inlet pipe is connected between the cold medium outlet of the surface condenser and the inlet of the radiator.

6. The caustic soda concentration and secondary steam recovery system according to claim 5, characterized in that, A temporary sewage discharge pipe is connected between the sewage inlet pipe and the inlet of the radiator.

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