Efficient hydrochloric acid refining device

Abstract

The utility model belongs to the technical field of hydrochloric acid, and particularly relates to an efficient hydrochloric acid refining device which comprises a raw material acid tank and a calcium chloride preparation kettle, a feeding pump is fixedly mounted at the bottom of the raw material acid tank, an output end of the feeding pump is fixedly connected with a desorption tower, and a reflux pump is fixedly mounted at the top of the desorption tower. And the output end of the reflux pump is fixedly connected with a reflux tank. SiCl4 is adopted as a drying agent and is matched with a liquid filtering device, waste liquid discharge is avoided, only trace solid products appear, the waste liquid treatment cost is reduced, a secondary concentration device is adopted for calcium chloride concentration, the concentration temperature of calcium chloride is reduced, the hydrochloric acid content in wastewater is reduced, the steam consumption is reduced, and the system economy is improved; the liquid generated by the first-stage desorption condenser, the second-stage desorption condenser and the condensed demister passes through the reflux tank and is refluxed by adopting the reflux pump, so that the requirement on the installation height of corresponding equipment is reduced, and the capital construction cost can be obviously reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of hydrochloric acid, and particularly relates to a high-efficiency hydrochloric acid refining device. BACKGROUND

[0002] High-purity hydrochloric acid is an important chemical raw material, and a calcium chloride method resolution and absorption device is widely used, but the existing device has the problems that concentrated sulfuric acid is used as a drying agent, waste sulfuric acid is generated, and a high-concentration hydrochloric acid-containing wastewater is generated in a calcium chloride concentration process, and the device is high in height, is generally above 20m, and brings great difficulty to installation and equipment maintenance.

[0003] In view of the deficiencies of the high-purity hydrochloric acid production device, a high-efficiency high-purity hydrochloric acid refining device is designed, SiCl4 is used as a drying agent, and a two-stage concentration device is used in the calcium chloride concentration device, so that the concentration of hydrochloric acid in the wastewater is reduced. UTILITY MODEL CONTENTS

[0004] To solve the problems in the background art, the utility model provides a high-efficiency hydrochloric acid refining device, and solves the problem of how.

[0005] To achieve the above object, the utility model provides the following technical scheme: a high-efficiency hydrochloric acid refining device, comprising a raw material acid tank and a calcium chloride preparation kettle, a feed pump is fixedly installed at the bottom of the raw material acid tank, the output end of the feed pump is fixedly connected with a desorption tower, a reflux pump is fixedly installed at the top of the desorption tower, the output end of the reflux pump is fixedly connected with a reflux tank, a condensation demister, a two-stage desorption condenser, a first-stage desorption condenser and a raw material acid preheater are fixedly connected on one side of the reflux tank, and the condensation demister, the two-stage desorption condenser, the first-stage desorption condenser and the raw material acid preheater are connected with each other, a heat recovery device is fixedly installed on one side of the condensation demister, a drying tower is fixedly installed on one side of the heat recovery device, a drying demister is fixedly installed on one side of the drying tower, an absorption tower is fixedly installed on one side of the drying demister, an absorption circulating pump is fixedly installed on one side of the absorption tower, an absorption cooler is fixedly connected with the output end of the absorption circulating pump, a drying agent circulating pump is fixedly installed at the bottom of the drying tower, a drying agent filtering pump is fixedly installed on one side of the drying agent circulating pump, and a drying agent filter is fixedly installed on one side of the drying agent filtering pump.

[0006] Preferably, a desorption reboiler is fixedly installed at the bottom of the desorption tower, a one-stage concentration evaporator is fixedly installed on one side of the desorption reboiler, and a one-stage vapor-liquid separation tank is fixedly installed on one side of the one-stage concentration evaporator.

[0007] Preferably, one side of the one-effect vapor-liquid separation tank is fixedly installed with one-effect overflow tank, one side of the one-effect overflow tank is fixedly installed with steam-water separation tank, two-effect concentration evaporator and two-effect vapor-liquid separation tank, one side of the steam-water separation tank is fixedly installed with cooler.

[0008] Preferably, one side of the two-effect vapor-liquid separation tank is fixedly installed with two-effect overflow pipe, the top of the two-effect vapor-liquid separation tank is fixedly installed with concentration condenser, one side of the concentration condenser is fixedly installed with buffer tank.

[0009] Preferably, one side of the buffer tank is fixedly installed with vacuum pump, one side of the cooler is fixedly installed with condensate tank.

[0010] Preferably, one side of the condensate tank is fixedly installed with concentration waste water pump, the condensate tank is fixedly connected with the concentration condenser, and the bottom of the two-effect overflow pipe is fixedly installed with calcium chloride circulating pump.

[0011] Preferably, the output end of the calcium chloride circulating pump is fixedly connected with the desorption tower, the bottom of the calcium chloride preparation kettle is fixedly installed with calcium chloride supplement pump, and the output end of the calcium chloride supplement pump is fixedly connected with the one-effect vapor-liquid separation tank.

[0012] Compared with the prior art, the utility model has the advantages of:

[0013] Adopt SiCl4 as drying agent, cooperate liquid filter device, do not produce waste liquid discharge, only appear trace solid product, reduce waste liquid treatment cost, calcium chloride concentration adopts two stage concentration device, reduce calcium chloride concentration temperature, reduce hydrochloric acid content in waste water and reduce steam consumption, improve system economy, raw material acid preheater, first desorption condenser, second desorption condenser and liquid produced after condensation demister adopt reflux pump to carry out reflux through reflux tank, reduce the requirement to corresponding equipment installation height, can obviously reduce capital cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0015] Figure 1 It is flow structure diagram of the utility model;

[0016] Figure 2 It is the utility model Figure 1 enlarged schematic view of A place in the utility model;

[0017] Figure 3 It is the utility model Figure 1 enlarged schematic view of B place in the utility model;

[0018] Figure 4 For the utility model Figure 1 The enlarged view of the middle C.

[0019] In the figure: 1, raw material acid tank; 2, feed pump; 3, desorption reboiler; 4, calcium chloride preparation kettle; 5, calcium chloride supply pump; 6, one effect concentration evaporator; 7, calcium chloride circulating pump; 8, condensate tank; 9, concentration waste water pump; 10, buffer tank; 11, vacuum pump; 12, concentration condenser; 13, absorption circulating pump; 14, absorption cooler; 15, absorption tower; 16, post-condensation mist eliminator; 17, two-stage desorption condenser; 18, one-stage desorption condenser; 19, raw material acid preheater; 20, desorption tower; 21, reflux pump; 22, reflux tank; 23, one effect overflow tank; 24, one effect vapor-liquid separation tank; 25, cooler; 26, steam-water separation tank; 27, two effect concentration evaporator; 28, two effect vapor-liquid separation tank; 29, two effect overflow pipe; 30, heat recovery device; 31, desiccant filter; 32, desiccant filter pump; 33, desiccant circulating pump; 34, post-drying mist eliminator; 35, drying tower; 36 mixer. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to 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 the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Please refer to Figures 1-4The utility model provides the following technical scheme: an efficient hydrochloric acid refining device, including raw material acid jar 1 and calcium chloride preparation cauldron 4, the bottom fixed mounting of raw material acid jar 1 has feed pump 2, the output fixed connection of feed pump 2 has desorption tower 20, the top fixed mounting of desorption tower 20 has reflux pump 21, the output fixed connection of reflux pump 21 has reflux jar 22, one side of reflux jar 22 is fixedly connected with condensing after demister 16, two stage desorption condenser 17, primary desorption condenser 18 and raw material acid preheater 19, and condensing after demister 16, two stage desorption condenser 17, primary desorption condenser 18 and raw material acid preheater 19 are connected with each other, one side of condensing after demister 16 is fixedly installed with heat recovery ware 30, one side of heat recovery ware 30 is fixedly installed with drying tower 35, one side of drying tower 35 is fixedly installed with dry after demister 34, one side of dry after demister 34 is fixedly installed with absorption tower 15, one side of absorption tower 15 is fixedly installed with absorption circulating pump 13, the output fixed connection of absorption circulating pump 13 has absorption cooler 14, the bottom fixed mounting of drying tower 35 has drying agent circulating pump 33, one side of drying agent circulating pump 33 is fixedly installed with drying agent filter pump 32, one side of drying agent filter pump 32 is fixedly installed with drying agent filter 31.

[0022] Working principle: raw material acid enters the raw material acid tank 1, through the feed pump 2 into the mixer 36 through the raw material acid preheater 19, the flow of raw material acid is controlled by the flow control valve, the preheated raw material acid and the high concentration calcium chloride solution from the calcium chloride circulating pump 7 are mixed and then enter the desorption tower 20, the liquid flows from top to bottom, the desorption in the tower, the rising steam generated under the action of the desorption reboiler 3 at the bottom of the tower is used to maintain the desorption process, part of the liquid at the bottom enters the subsequent calcium chloride concentration process. The concentration process is carried out by two-stage concentration, the low concentration calcium chloride liquid from the desorption tower 20 first enters the one-stage concentration process composed of one-stage concentration evaporator 6, one-stage gas-liquid separation tank 24, and then enters the two-stage concentration process composed of two-stage concentration evaporator 27 and two-stage gas-liquid separation tank 28 after flashing through one-stage overflow tank 23. The steam generated in the one-stage evaporation process enters the two-stage concentration evaporator 27 as a heating heat source, the condensate enters the steam-water separation tank 26, and then enters the condensate water pipe after cooling through the cooler 25. The steam generated in the two-stage evaporation process enters the concentration condenser 12 after condensation, and then enters the condensate tank 8. The liquid in the condensate tank 8 is discharged from the system by the concentration wastewater pump 9. The concentrated liquid of the two-stage evaporation process enters the mixer 36 through the calcium chloride circulating pump 7. The gas at the top of the desorption tower 20 enters the condensation after-mist eliminator 16 after the raw material acid preheater 19, the first desorption condenser 18, and the second desorption condenser 17, removes the entrained water, and then enters the dry tower 35 through the heat recovery device. After removing the internal trace amount of water, it enters the absorption device composed of the absorption tower 15, the absorption cooler 14, and the absorption circulating pump 13 through the dry after-mist eliminator 34, and generates the product acid. The internal liquid of the dry tower 35 exchanges heat with the gas from the condensation after-mist eliminator 16 through the heat recovery device 30 under the action of the drying agent circulating pump 33, removes the heat generated by the water absorption reaction and the pump, and returns to the dry tower 35. The internal liquid of the dry tower 35 enters the drying agent filter 31 under the action of the drying agent filtering pump 32, removes the solid particles generated in the liquid, and returns to the dry tower 35. The liquid generated by the raw material acid preheater 19, the first desorption condenser 18, the second desorption condenser 17, and the condensation after-mist eliminator 16 enters the reflux tank 22, and then returns to the top of the desorption tower 20 through the reflux pump 21. All electrical equipment in the device is powered by an external power supply.

[0023] In one aspect of the embodiment, the product can be preliminarily concentrated by the desorption reboiler 3, the one-stage concentration evaporator 6, the one-stage gas-liquid separation tank, the one-stage overflow tank 23, and the steam-water separation tank 26, and further concentrated by the two-stage concentration evaporator 27, the two-stage gas-liquid separation tank 28, the two-stage overflow tank 29, the two-stage gas-liquid separation tank 28, the concentration condenser 12, and the buffer tank 10. Through two-stage concentration, the calcium chloride concentration is carried out by two-stage concentration device, the calcium chloride concentration temperature is reduced, the content of hydrochloric acid in the wastewater is reduced, the steam consumption is reduced, and the economic efficiency of the system is improved.

[0024] In one aspect of the embodiment, the acidic condensate can be conveniently discharged through the concentration wastewater pump 9 and the condensate tank 8, the tail gas can be conveniently discharged through the buffer tank 10, the vacuum pump 11 and the concentration condenser 12, the finished hydrochloric acid can be conveniently generated through the absorption circulating pump 13 and the absorption cooler 14, and the finished hydrochloric acid can flow out conveniently, through the above structure, the normal operation of the device can be ensured, the emission of pollutants can be reduced while the hydrochloric acid is generated, and compared with liquid pollutants, the solid pollutants generated by the device are easier to handle.

[0025] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of the present application.

Claims

1. A high-efficiency hydrochloric acid refining device, comprising a raw material acid tank (1) and a calcium chloride preparation kettle (4), characterized in that: The bottom of the raw material acid tank (1) is fixedly installed with an inlet pump (2), the output end of the inlet pump (2) is fixedly connected with a desorption tower (20), the top of the desorption tower (20) is fixedly installed with a reflux pump (21), the output end of the reflux pump (21) is fixedly connected with a reflux tank (22), one side of the reflux tank (22) is fixedly connected with a post-condensation demister (16), a secondary desorption condenser (17), a primary desorption condenser (18) and a raw material acid preheater (19), and the post-condensation demister (16), the secondary desorption condenser (17), the primary desorption condenser (18) and the raw material acid preheater (19) are connected with each other, one side of the post-condensation demister (16) is fixedly installed with a heat recovery device (30), one side of the heat recovery device (30) is fixedly installed with a drying tower (35), one side of the drying tower (35) is fixedly installed with a post-drying demister (34), one side of the post-drying demister (34) is fixedly installed with an absorption tower (15), one side of the absorption tower (15) is fixedly installed with an absorption circulating pump (13), the output end of the absorption circulating pump (13) is fixedly connected with an absorption cooler (14), the bottom of the drying tower (35) is fixedly installed with a drying agent circulating pump (33), one side of the drying agent circulating pump (33) is fixedly installed with a drying agent filtering pump (32), one side of the drying agent filtering pump (32) is fixedly installed with a drying agent filter (31).

2. A high efficiency hydrochloric acid refining device according to claim 1, characterized in that: The bottom of the desorption tower (20) is fixedly installed with a desorption reboiler (3), one side of the desorption reboiler (3) is fixedly installed with a one-effect concentration evaporator (6), one side of the one-effect concentration evaporator (6) is fixedly installed with a one-effect vapor-liquid separation tank (24).

3. A high efficiency hydrochloric acid refining device according to claim 2, characterized in that: One side of the one-effect vapor-liquid separation tank (24) is fixedly installed with a one-effect overflow tank (23), one side of the one-effect overflow tank (23) is fixedly installed with a steam-water separation tank (26), a two-effect concentration evaporator (27) and a two-effect vapor-liquid separation tank (28), one side of the steam-water separation tank (26) is fixedly installed with a cooler (25).

4. A high efficiency hydrochloric acid refining device according to claim 3, characterized in that: One side of the two-effect vapor-liquid separation tank (28) is fixedly installed with a two-effect overflow pipe (29), the top of the two-effect vapor-liquid separation tank (28) is fixedly installed with a concentration condenser (12), one side of the concentration condenser (12) is fixedly installed with a buffer tank (10).

5. A high efficiency hydrochloric acid refining device as claimed in claim 4, characterized in that: One side of the buffer tank (10) is fixedly installed with a vacuum pump (11), one side of the cooler (25) is fixedly installed with a condensate tank (8).

6. A high efficiency hydrochloric acid refining device as claimed in claim 5, characterized in that: One side of the condensate tank (8) is fixedly installed with a concentration waste water pump (9), and the condensate tank (8) is fixedly connected with the concentration condenser (12), the bottom of the two-effect overflow pipe (29) is fixedly installed with a calcium chloride circulating pump (7).

7. A high efficiency hydrochloric acid refining device as claimed in claim 6, characterized in that: The output end of the calcium chloride circulating pump (7) is fixedly connected with the desorption tower (20), the bottom of the calcium chloride preparation kettle (4) is fixedly installed with a calcium chloride supplement pump (5), and the output end of the calcium chloride supplement pump (5) is fixedly connected with the one-effect vapor-liquid separation tank (24).

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