Concentration and purification device for byproduct sodium hydrosulfide solution

Abstract

The utility model discloses a concentration and purification device for a byproduct sodium hydrosulfide solution and belongs to the technical field of waste liquid treatment equipment. The preheating assembly, the first-stage evaporation and concentration assembly, the second-stage evaporation and concentration assembly and the condensation assembly are sequentially connected, a discharging opening in the bottom of the first-stage evaporation and concentration assembly is communicated with a feeding opening of the first-stage evaporation and concentration assembly, and a discharging opening in the bottom of the second-stage evaporation and concentration assembly is communicated with a feeding opening of the second-stage evaporation and concentration assembly; a gas outlet in the top of the first-stage evaporation and concentration assembly, a gas outlet in the top of the second-stage evaporation and concentration assembly and a gas outlet in the top of the first-stage condensation assembly are all communicated with the hydrogen sulfide absorption assembly. According to the device, the concentration of sodium hydrosulfide in the filtration liquid can be improved, most impurities can be removed, so that the sodium carbonate and other impurities in the product are few, the decomposition of sodium hydrosulfide is little, the product yield is high, and continuous automatic production is realized; and pollution to the environment is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to a concentration and purification device for by-product sodium hydrosulfide solution, belonging to the technical field of waste liquid treatment equipment. BACKGROUND

[0002] A large amount of hydrogen sulfide gas is by-produced in the generation of mercaptoacetic acid and black powder, in order to prevent environmental pollution, the hydrogen sulfide gas is usually absorbed by liquid alkali to generate sodium hydrosulfide solution, the content of sodium hydrosulfide in the solution after absorption is generally 22-27%, and a certain amount of sodium carbonate and other impurities are contained, so the solution is difficult to be directly used as sodium hydrosulfide raw material, and the transportation cost is increased due to the low content of sodium hydrosulfide, therefore, the solution needs to be concentrated and impurities removed.

[0003] The evaporation concentration process of the sodium hydrosulfide solution has the following characteristics: 1, due to the difference in solubility, salt is precipitated in the evaporation process, and the amount of the precipitated salt is more at the beginning and less at the end; with the evaporation, the viscosity of the material gradually increases; 2, with the increase of the concentration, the boiling point of the material gradually increases, and the boiling point can reach 140 DEG C near the evaporation end point.

[0004] At present, the evaporation concentration equipment for the sodium hydrosulfide solution is mainly a kettle type evaporation chamber or a large pot, and the removal of the salt is mainly based on sedimentation, and the existing problems are high energy consumption, discontinuous production, incomplete removal of impurities, difficult collection of the decomposed hydrogen sulfide gas in the concentration process, new environmental pollution and the problem of the excessive impurities such as sodium carbonate in the final sodium hydrosulfide product. CONTENT OF THE INVENTION

[0005] The application aims to overcome the defects of the prior art, and provides a concentration and purification device for by-product sodium hydrosulfide solution, which realizes the concentration and impurity removal of the sodium hydrosulfide solution by two-stage evaporation concentration to generate a sodium hydrosulfide product.

[0006] The application adopts the technical scheme that the concentration and purification device for by-product sodium hydrosulfide solution comprises a preheating assembly, a first-stage evaporation concentration assembly, a second-stage evaporation concentration assembly, a condensation and crystallization assembly and a hydrogen sulfide absorption assembly, the preheating assembly, the first-stage evaporation concentration assembly, the second-stage evaporation concentration assembly and the condensation assembly are sequentially connected, a discharge port at the bottom of the first-stage evaporation concentration assembly is communicated with a feeding port of the first-stage evaporation concentration assembly, a discharge port at the bottom of the second-stage evaporation concentration assembly is communicated with a feeding port of the second-stage evaporation concentration assembly, and the gas outlet at the top of the first-stage evaporation concentration assembly, the gas outlet at the top of the second-stage evaporation concentration assembly and the gas outlet at the top of the first condensation assembly are all communicated with the hydrogen sulfide absorption assembly.

[0007] Further, the preheating assembly comprises a first-stage preheater and a second-stage preheater, a pipe passage outlet of the first-stage preheater is communicated with a pipe passage inlet of the second-stage preheater, a pipe passage outlet of the second-stage preheater is communicated with a feeding port of the first-stage evaporation and concentration assembly, and a shell passage outlet of the second-stage preheater is communicated with a shell passage inlet of the first-stage preheater.

[0008] Further, the first-stage evaporation and concentration assembly comprises a first-stage heater, a first-stage evaporation chamber and a first-stage filter, a material outlet of the preheating assembly is communicated with a material inlet of the first-stage heater, a material outlet of the first-stage heater is communicated with a feeding port of the first-stage evaporation chamber in series, and a filtered liquid outlet of the first-stage filter is communicated with a feeding port of the second-stage evaporation assembly.

[0009] Further, the first-stage evaporation and concentration assembly further comprises a steam compressor and a first-stage gas-liquid separator, a steam outlet of the first-stage evaporation chamber is communicated with a steam inlet of the first-stage heater in series through the first-stage gas-liquid separator and the steam compressor.

[0010] Further, the second-stage evaporation and concentration assembly comprises a second-stage heater, a second-stage evaporation chamber and a second-stage filter, a filtered liquid outlet of the first-stage evaporation assembly is communicated with a material outlet of the second-stage heater, a material outlet of the second-stage heater is communicated with a feeding port of the second-stage filter in series through the second-stage evaporation chamber, and a filtered liquid outlet of the second-stage filter is connected with the condensation and crystallization assembly.

[0011] Further, the condensation and crystallization assembly comprises an insulation kettle and a condensation and crystallization slicing machine, a filtered liquid outlet of the second-stage evaporation and crystallization assembly is connected with a feeding port of the condensation and crystallization slicing machine in series through the insulation kettle.

[0012] Compared with the prior art, the device has the beneficial effects that:

[0013] The first-stage evaporation and concentration assembly and the second-stage evaporation and concentration assembly of the device can realize staged evaporation and concentration, so that the concentration of sodium hydrosulfide in the filtered liquid can be improved, most of impurities can be removed, the content of sodium carbonate and other salts in the product is small, the decomposition of sodium hydrosulfide is small, the product yield is high, continuous and automatic production is realized, and in addition, hydrogen sulfide gas generated in the whole process is absorbed through the hydrogen sulfide absorption assembly, so as to avoid pollution to the environment.

[0014] The device provided by the utility model integrates concentration and impurity removal, and the content of sodium hydrosulfide after concentration and purification by the device reaches more than 70%, and crystallizes into a solid, and the content of sodium carbonate and other salts reaches the control standard of industrial sodium hydrosulfide. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the device for concentrating and purifying by-product sodium hydrosulfide solution.

[0016] Figure: 1, sodium hydrosulfide input pipe; 2, first preheater; 3, second preheater; 4, steam compressor; 5, first gas-liquid separator; 6, first evaporation chamber; 7, first filter; 8, second gas-liquid separator; 9, second evaporation chamber; 10, second filter; 11, insulation kettle; 12, condensation crystallization slicer; 13, second heater; 14, second circulating pump; 15, first heater; 16, first circulating pump; 17, condensate tank; 18, condenser; 19, water ring pump. DETAILED DESCRIPTION

[0017] Figure 1 The best embodiment of the utility model, the following will be combined with the attached Figure 1 The utility model is further explained.

[0018] A kind of by-product sodium hydrosulfide solution concentration purification device, including preheating component, first evaporation concentration component, second evaporation concentration component, condensation crystallization component and hydrogen sulfide absorption component, preheating component, first evaporation concentration component, second evaporation concentration component and condensation component are sequentially connected, the discharge port at the bottom of first evaporation concentration component and the feed port of first evaporation concentration component are communicated, the discharge port at the bottom of second evaporation concentration component and the feed port of second evaporation concentration component are communicated, the gas outlet at the top of first evaporation concentration component, the gas outlet at the top of second evaporation concentration component and the gas outlet at the top of first condensation component are all communicated with hydrogen sulfide absorption component.The first evaporation concentration component and second evaporation concentration component of the by-product sodium hydrosulfide solution concentration purification device can realize staged evaporation concentration, so as to improve the concentration of sodium hydrosulfide in filtrate, also can remove most impurities, make less impurities such as sodium carbonate in product, less sodium hydrosulfide decomposition, product yield is high, realize continuous automatic production, in addition, hydrogen sulfide gas generated in the whole process is absorbed by hydrogen sulfide absorption component, to avoid pollution to the environment.

[0019] The utility model is further explained below in conjunction with specific embodiment, however people skilled in the art should understand, detailed description given here in conjunction with the attached drawings is to explain better, the structure of the utility model must exceed these limited embodiments, and for some equivalent alternative or common means, this document will not be described in detail, but still belong to the protection scope of the present application.

[0020] Specifically, referring to the attached Figure 1 The by-product sodium hydrosulfide solution concentration purification device also includes condensate tank 17, condenser 18 and water ring pump 19.

[0021] The steam outlet of the preheating assembly and the steam outlet of the primary evaporation assembly are communicated with the tube side inlet of the condenser 18, the tube side outlet of the condenser 18 is communicated with the input port of the water ring pump 19, the output port of the water ring pump 19 is communicated with the hydrogen sulfide absorption assembly, which is a hydrogen sulfide absorption tower in the embodiment. The condensate outlets of the preheating assembly and the evaporation assembly are communicated with the condensate tank 17.

[0022] The preheating assembly comprises a primary preheater 2 and a secondary preheater 3, the sodium hydrosulfide input pipe 1 is communicated with the tube side inlet of the primary preheater 2, the tube side outlet of the primary preheater 2 is communicated with the tube side inlet of the secondary preheater 3, the shell side inlet of the primary preheater 2 is communicated with the condensate tank 17, and the primary preheater 2 preheats the sodium hydrosulfide solution by condensate. The secondary preheater 3 preheats the sodium hydrosulfide solution by steam, and the shell side outlet of the secondary preheater 3 is communicated with the condensate tank 17.

[0023] The primary evaporation and concentration assembly comprises a primary heater 15, a primary evaporation chamber 6, a primary filter 7, a steam compressor 4, a primary circulating pump 16 and a primary gas-liquid separator 5.

[0024] The material outlet of the primary heater 15 is communicated with the feed inlet of the primary filter 7 in series after the primary evaporation chamber 6, the tube side outlet of the secondary preheater 3 and the material outlet at the bottom of the primary evaporation chamber 6 are both communicated with the input port of the primary circulating pump 16, and the output port of the primary circulating pump 16 is communicated with the material inlet of the primary heater 15.

[0025] The steam outlet of the primary evaporation chamber 6 is communicated with the steam inlet of the primary heater 15 in series after the primary gas-liquid separator 5 and the steam compressor 4, and the steam outlet of the primary heater 15 is communicated with the condensate tank 17.

[0026] The secondary evaporation and concentration assembly comprises a secondary heater 13, a secondary gas-liquid separator 8, a secondary evaporation chamber 9, a secondary filter 10 and a secondary circulating pump 14.

[0027] The material outlet of the secondary heater 13 is communicated with the feed inlet of the secondary filter 10 in series after the secondary evaporation chamber 9, the steam outlet of the secondary evaporation chamber 9 is communicated with the shell side inlet of the secondary preheater 3 in series after the secondary gas-liquid separator 8, the material outlet at the bottom of the secondary evaporation chamber 9 and the filtrate outlet of the primary filter 7 are both communicated with the input port of the secondary circulating pump 14, and the output port of the secondary circulating pump 14 is communicated with the material inlet of the secondary heater 13.

[0028] The condensation assembly comprises a heat preservation kettle 11 and a condensation crystallization slicer 12, the filtrate outlet of the secondary filter 10 is communicated with the heat preservation kettle 11, the material outlet of the heat preservation kettle 11 is communicated with the condensation crystallization slicer 12, and the steam outlet of the heat preservation kettle 11 is communicated with the shell side inlet of the secondary preheater 3.

[0029] The sodium hydrosulfide solution is heated by the first-stage preheater 2 and the second-stage preheater 3, and then enters the input port of the first-stage circulating pump 16. The first-stage circulating pump 16 delivers the material in the first-stage evaporation chamber 6 and the newly added material to the first-stage evaporation chamber 6 through the first-stage heater 15. The material in the first-stage evaporation chamber 6 is removed by more than 70% of water, and then enters the first-stage filter 7 from the bottom. The clear liquid after removing sodium carbonate and other impurities enters the second-stage circulating pump 14. The second-stage circulating pump 14 delivers the material in the second-stage heater 13 and the clear liquid in the first-stage filter 7 to the second-stage evaporation chamber 9 through the second-stage heater 13. The material in the second-stage evaporation chamber 9 is removed by more than 14% of water, and then enters the second-stage filter 10 from the bottom. The clear liquid after removing sodium carbonate and other impurities in the second-stage filter 10 enters the heat preservation kettle 11. The content of more than 70% of sodium hydrosulfide in the heat preservation kettle 11 flows to the condensation and slicing machine 12 for condensation and slicing, and solid sodium hydrosulfide is obtained.

[0030] The steam in the first-stage evaporation chamber 6 enters the steam compressor 4 through the first-stage gas-liquid separator 5, and is compressed into steam, which is used as the main heat source for the first-stage evaporation in the first-stage heater 15. The steam in the second-stage heater 13 enters the shell side of the second-stage preheater 3 together with the steam in the heat preservation kettle 11 to heat the incoming sodium hydrosulfide solution. The steam condensate in the first-stage heater 15, the second-stage heater 13 and the heat preservation kettle 11 enters the condensate tank 17, and then enters the first-stage preheater 2 to heat the raw material sodium hydrosulfide solution.

[0031] The filter residues in the first-stage filter 7 and the second-stage filter 10 are dried by compressed air blowing, and are discharged by vibration. The exhaust of the water ring pump 19 enters the hydrogen sulfide absorption tower, and the condensate generated by the system is transported to the sewage workshop.

[0032] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to obtain equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments without departing from the technical solution of the present application, and according to the technical essence of the present application, still belong to the protection scope of the technical solution of the present application.

Claims

1. A concentration and purification apparatus for a by-product sodium hydrosulfide solution, characterized by: The application relates to a hydrogen sulfide absorption device, which comprises a preheating assembly, a primary evaporation and concentration assembly, a secondary evaporation and concentration assembly, a condensation and crystallization assembly and a hydrogen sulfide absorption assembly.

2. The apparatus for concentrating and purifying a by-product sodium hydrosulfide solution according to claim 1, characterized by: The preheating assembly comprises a primary preheater (2) and a secondary preheater (3), the tube passage outlet of the primary preheater (2) is communicated with the tube passage inlet of the secondary preheater (3), the tube passage outlet of the secondary preheater (3) is communicated with the feed inlet of the primary evaporation and concentration assembly, and the shell passage outlet of the secondary preheater (3) is communicated with the shell passage inlet of the primary preheater (2).

3. The apparatus for concentrating and purifying a by-product sodium hydrosulfide solution according to claim 1, characterized by: The primary evaporation and concentration assembly comprises a primary heater (15), a primary evaporation chamber (6) and a primary filter (7), the feed outlet of the preheating assembly is communicated with the material inlet of the primary heater (15), the material outlet of the primary heater (15) is communicated with the feed inlet of the primary filter (7) in series after the primary evaporation chamber (6), and the filtered liquid outlet of the primary filter (7) is communicated with the feed inlet of the secondary evaporation assembly.

4. The apparatus for concentrating and purifying a by-product sodium hydrosulfide solution according to claim 3, characterized by: The primary evaporation and concentration assembly further comprises a steam compressor (4) and a primary gas-liquid separator (5), the steam outlet of the primary evaporation chamber (6) is communicated with the steam inlet of the primary heater (15) in series after the primary gas-liquid separator (5) and the steam compressor (4).

5. The apparatus for concentrating and purifying a by-product sodium hydrosulfide solution according to claim 1, characterized by: The secondary evaporation and concentration assembly comprises a secondary heater (13), a secondary evaporation chamber (9) and a secondary filter (10), the filtered liquid outlet of the primary evaporation assembly is communicated with the material outlet of the secondary heater (13), the feed inlet of the secondary filter (10) is communicated with the feed outlet of the secondary heater (13) in series after the secondary evaporation chamber (9), and the filtered liquid outlet of the secondary filter (10) is connected with the condensation and crystallization assembly.

6. The apparatus for concentrating and purifying a by-product sodium hydrosulfide solution according to claim 1 or 5, characterized by: The condensation and crystallization assembly comprises a heat preservation kettle (11) and a condensation and crystallization slicing machine (12), the filtered liquid outlet of the secondary evaporation and crystallization assembly is connected with the feed inlet of the condensation and crystallization slicing machine (12) in series after the heat preservation kettle (11).

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