Desulfurization waste liquid concentration device

Abstract

The utility model discloses a desulfurization waste liquid concentration device which comprises a concentration kettle, the concentration kettle is connected with a condenser, the condenser is connected with a condensate collecting tank, the condenser is connected with a vacuumizing pipe, a vacuumizing control valve is arranged on the vacuumizing pipe, a primary steam control valve is arranged at a primary steam inlet, and a secondary steam control valve is arranged at a secondary steam outlet. A temperature sensor is arranged in the concentration kettle, the concentration kettle is also provided with a pressure sensor, a pressure release valve is arranged at the top of the concentration kettle, and the vacuumizing control valve, the primary steam control valve, the pressure release valve, the pressure sensor and the temperature sensor are simultaneously connected with a controller. According to the utility model, the ammonia process wet oxidation desulfurization process taking HPF as a catalyst is implemented, the concentration kettle is improved, and the vacuumizing control valve, the primary steam control valve and the pressure release valve are controlled through the controller, so that the phenomenon of material leakage during concentration can be effectively avoided, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of desulfurization waste liquid disposal, in particular to a desulfurization waste liquid concentration device. Background Art

[0002] Coking plants produce toxic and hazardous gases such as H2S and HCN during the coking process, causing serious environmental pollution and inappropriate handling can result in environmental penalties. The coking industry utilizes an ammonia-based wet oxidation desulfurization process using HPF as a catalyst to remove H2S and HCN from coke oven gas. Treatment of desulfurization wastewater has become a critical component of the coking industry. Salt-containing desulfurization wastewater must be evaporated and concentrated, then crystallized in a crystallizer, where it is centrifuged to obtain the product. However, during the concentration and evaporation process, salt-containing liquid often enters the condenser, reducing product yield and impacting production efficiency during treatment. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a desulfurization waste liquid concentration device.

[0004] The utility model is implemented as follows: when treating desulfurization waste liquid in a coking plant, the desulfurization waste liquid is first filtered by a filtering device to preliminarily purify suspended matter in the desulfurization liquid, and then deep-treated by activated carbon adsorption to form a decolorized liquid. The purified decolorized liquid is evaporated under reduced pressure, and then crystallized, separated and purified to produce ammonium thiocyanate, ammonium thiosulfate and ammonium sulfate products.

[0005] When the desulfurized supernatant is concentrated under reduced pressure, the desulfurized supernatant and the mother liquor produced during separation are slowly added according to the process requirements to gradually increase the concentration of the concentrated liquid. When it is concentrated to a certain concentration, the concentrated liquid is discharged to the crystallization kettle.

[0006] The desulfurization waste liquid concentrating device of the present invention comprises a concentrating kettle, which comprises a steam jacket, an inner tank, a decolorizing liquid inlet and a discharge port. The steam jacket is provided with a primary steam inlet and a primary steam outlet. A stirring motor is provided on the top of the concentrating kettle, a stirring blade is provided inside the inner tank, and the stirring motor is connected to the stirring blade via a stirring shaft. The concentrating kettle is connected to a condenser, which is connected to a condensate collecting tank, which is connected to a vacuum pipe, which is provided with a vacuum control valve, which is provided at the primary steam inlet, a primary steam control valve, a temperature sensor is provided in the concentrating kettle, and a pressure sensor is also provided in the concentrating kettle. A pressure relief valve is provided on the top of the concentrating kettle, and the vacuum control valve, the primary steam control valve, the pressure relief valve, the pressure sensor and the temperature sensor are connected to a controller at the same time. When material leakage occurs in the concentration kettle, the temperature inside the kettle rises and the pressure drops. The pressure and temperature change signals are transmitted to the controller, which closes the vacuum control valve and the primary steam control valve, and opens the pressure relief valve at the same time, so that the raw materials sucked into the vacuum tube return to the evaporator. When the temperature gradually drops to the set temperature, the controller controls the closing of the pressure relief valve, opening of the vacuum control valve, and finally opening of the primary steam control valve until the material is discharged in time when it is concentrated to a certain degree.

[0007] The top of the concentrator is also equipped with a mother liquor inlet, which is equipped with a mother liquor control valve. After the material enters the crystallization kettle, it is separated into solid and liquid by a centrifuge. The mother liquor after solid-liquid separation is transported to the concentrator via a pipeline for recycling, achieving zero pollution discharge.

[0008] The concentrator is also equipped with a sight glass, an internal sight glass light, and a liquid level gauge. The internal sight glass light is positioned above the highest position of the liquid level gauge. The highest position of the sight glass is aligned with the highest position of the liquid level gauge and is above the stirring blade. The sight glass, internal sight glass light, and liquid level gauge allow operators to observe the changes in the material in the concentrator and the changes in the liquid level within the kettle, facilitating operators to make reasonable judgments and perform appropriate operations.

[0009] A decolorant control valve is provided at the decolorant inlet, a drain control valve is provided at the drain outlet, and a secondary steam control valve is provided on the pipe connecting the concentrator to the condenser. The decolorant control valve and the drain control valve effectively control the amount of decolorant entering the concentrator. The secondary steam control valve plays an auxiliary role in treating material leakage. If material leakage is not serious, the secondary steam control valve can be directly closed to return the material to the concentrator.

[0010] The bottom of the concentration kettle is provided with a bracket, which facilitates the installation of the concentration kettle.

[0011] The beneficial effects of this utility model are as follows: The utility model implements an ammonia-based wet oxidation desulfurization process using HPF as a catalyst, completely resolving the serious environmental pollution problem of high-concentration, highly polluting, and difficult-to-treat desulfurization wastewater. Taking a 2.4 million ton / year coke production capacity as an example, 22,000 tons of desulfurization liquid are processed annually, and 2,000 tons of ammonium thiocyanate are recovered. While resolving desulfurization wastewater and ensuring desulfurization efficiency, this utility model achieves certain economic benefits for the enterprise. The utility model improves the concentration kettle and adopts automatic control to effectively prevent material leakage during concentration, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the top view of the structure of the utility model;

[0014] In the figure: 1-concentration kettle, 2-steam jacket, 3-inner tank, 4-primary steam inlet, 5-primary steam outlet, 6-stirring motor, 7-stirring paddle, 8-sight glass, 9-liquid level gauge, 10-bleaching liquid inlet, 11-mother liquor inlet, 12-secondary steam control valve, 13-condenser, 14-condenser tube, 15-vacuum pipe, 16-condensate collection tank, 17-kettle inner mirror light, 18-kettle temperature sensor, 19 bracket, 20-controller, 21-secondary steam outlet, 22-discharge port, 23-negative pressure gauge interface, 24-motor installation port, 25-manhole, 26-pressure relief valve installation hole, 27-discharge control valve, 28-primary steam control valve, 29-bleaching liquid control valve, 30-mother liquor control valve, 31-vacuum control valve. DETAILED DESCRIPTION

[0015] In order to more clearly understand the technical solution of the present invention, the present invention is further described below with reference to the accompanying drawings.

[0016] like Figure 1-2The desulfurization waste liquid concentration device shown in the figure includes a concentration kettle 1, which includes a steam jacket 2, an inner tank 3, a decolorizing liquid inlet 10 and a discharge port 22. The steam jacket 2 is provided with a primary steam inlet 4 and a primary steam outlet 5. A stirring motor 6 is provided on the top of the concentration kettle 1, and a stirring blade 7 is provided inside the inner tank 3. The stirring motor 6 is connected to the stirring blade 7 through a stirring shaft. During concentration and evaporation, the stirring motor 6 drives the stirring blade 7 to rotate to promote material evaporation. The concentration kettle 1 is connected to a condenser 13, and the condenser 13 is connected to a condensate collection tank 16. A drain valve is provided at the bottom of the condensate collection tank 16. The condenser 13 is connected to a vacuum pipe 15, and a vacuum control valve 31 is provided on the vacuum pipe 15. A primary steam control valve 28 is provided at the primary steam inlet 4. A temperature sensor 18 is provided in the concentration kettle 1. Figure 1 Not shown in Figure 2 As shown, the temperature sensor 18 is arranged on the upper part of the concentration kettle 1. The temperature sensor 18 is used to measure the temperature inside the concentration kettle 1. A pressure sensor is also arranged inside the concentration kettle 1. Figure 2 As shown in FIG, a negative pressure gauge interface 23 is provided on the top of the concentrator, where a negative pressure gauge is installed. The negative pressure gauge signal is converted into an electrical signal and transmitted to the controller 20. A pressure relief valve is installed on the top of the concentrator 1, located at the pressure relief valve mounting hole 26. The vacuum control valve 31, primary steam control valve 28, pressure relief valve, pressure sensor, and temperature sensor 18 are all connected to the controller 20. When material escapes from the concentrator 2, the temperature inside the concentrator rises and the pressure drops. The pressure and temperature change signals are transmitted to the controller 20, which closes the vacuum control valve 31 and primary steam control valve 28 and simultaneously opens the pressure relief valve, allowing the material drawn into the vacuum tube to return to the evaporator. When the temperature gradually drops to the set temperature, the controller 20 controls the closing of the pressure relief valve, opening the vacuum control valve 31, and finally opening the primary steam control valve 28, until the material is concentrated to a certain degree and discharged in a timely manner. The concentrator 1 also has a mother liquor inlet 11 on the top, which is equipped with a mother liquor control valve 30.

[0017] The concentrator 1 is also equipped with a sight glass 8, an internal sight glass light 17, and a liquid level gauge 9. The internal sight glass light 17 is positioned above the highest point of the liquid level gauge 9, and the highest point of the sight glass 8 is aligned with the highest point of the liquid level gauge 9 and above the stirring blades. The sight glass 8, internal sight glass light 17, and liquid level gauge 9 allow operators to observe the changes in the material in the concentrator 1 and the changes in the liquid level within the concentrator, facilitating operators to make reasonable judgments and perform appropriate operations. A decolorant control valve 29 is provided at the decolorant inlet 10, and a drain control valve 27 is provided at the drain port 22. A secondary steam control valve 12 is installed on the pipeline connecting the concentrator 1 to the condenser 13. The decolorant control valve 29 and drain control valve 27 effectively control the amount of decolorant entering the concentrator 1. The secondary steam control valve 12 plays an auxiliary role in controlling material leakage. If material leakage is not serious, the secondary steam control valve 12 can be directly closed to return the material to the concentrator 1. A bracket 19 is provided at the bottom of the concentration kettle 1 to facilitate installation of the concentration kettle 1 .

[0018] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A desulfurization waste liquid concentration device, comprising a concentration kettle, the concentration kettle comprising a steam jacket, an inner tank, a decolorizing liquid inlet and a discharge port, the steam jacket being provided with a primary steam inlet and a primary steam outlet, a stirring motor being provided on the top of the concentration kettle, a stirring blade being provided inside the inner tank, the stirring motor being connected to the stirring blade via a stirring shaft, the concentration kettle being connected to a condenser, and the condenser being connected to a condensate collection tank, characterized in that: The condenser is connected to a vacuum pipe, a vacuum control valve is provided on the vacuum pipe, a primary steam control valve is provided at the primary steam inlet, a temperature sensor is provided in the concentration kettle, the concentration kettle is also provided with a pressure sensor, a pressure relief valve is provided on the top of the concentration kettle, and the vacuum control valve, primary steam control valve, pressure relief valve, pressure sensor and temperature sensor are connected to the controller at the same time.

2. A desulfurization waste liquid concentration device according to claim 1, characterized in that: The upper part of the concentration kettle is also provided with a mother liquor inlet, and a mother liquor control valve is provided at the mother liquor inlet.

3. A desulfurization waste liquid concentration device according to claim 1, characterized in that: The concentration kettle is also provided with a sight glass, a kettle internal sight glass light and a liquid level gauge. The kettle internal sight glass light is arranged above the highest position of the liquid level gauge. The highest position of the sight glass is flush with the highest position of the liquid level gauge and above the stirring blade.

4. A desulfurization waste liquid concentration device according to claim 1, characterized in that: The decolorizing liquid inlet is provided with a decolorizing liquid control valve, the discharge port is provided with a discharge liquid control valve, and the pipeline connecting the concentration kettle and the condenser is provided with a secondary steam control valve.

5. The desulfurization waste liquid concentration device according to claim 1, characterized in that: The bottom of the concentration kettle is provided with a bracket.

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