Desulfurization wastewater pollution discharge device

Abstract

The utility model discloses a desulfurization waste water pollution discharge device which comprises a tank body, a liquid inlet at the upper end of the tank body is connected with a waste water pipe, a liquid level transmitter for monitoring the height of waste liquid in the tank body is arranged on the tank body, a liquid outlet at the lower end of the tank body is connected with a liquid discharge pipe, a sewage valve and a drainage pump are arranged on the liquid discharge pipe, and the sewage valve is close to one side of the tank body relative to the drainage pump; a bypass pipe is arranged on the drain pipe between the sewage valve and the drain valve, and a clear water valve is arranged on the bypass pipe; the clear water valve, the sewage valve, the drainage pump and the liquid level transmitter are all electrically connected with the PLC; an anti-corrosion layer is arranged on the inner wall of the liquid discharge pipe; when the waste liquid in the tank body is lower than a set threshold value, entering a cleaning mode; and when the waste liquid in the tank body is higher than a set threshold value, a liquid discharge mode is entered. Through application of the anti-corrosion layer and regular washing with clear water, the corrosion effect of alkali-containing waste water on pipelines and valves is reduced, and the probability of equipment failures and liquid leakage is reduced. And through automatic control, the operation difficulty is reduced, and operation of workers is facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of titanium dioxide production equipment and relates to a desulfurization wastewater discharge device. Background Art

[0002] In the calcination process of preparing titanium dioxide by the sulfuric acid method, titanic acid is calcined at high temperature in a rotary kiln to remove the water and sulfuric acid adsorbed by hydrated titanium dioxide, and complete the crystal transformation and particle growth process.

[0003] The reaction equation is: TiO2*xSO2*yH2O→TiO2+xSO2↑+yH2O↑

[0004] The desulfurization tower in the exhaust gas environmental protection treatment is mainly used to absorb sulfur dioxide in the exhaust gas so that the exhaust gas emissions meet the relevant standards.

[0005] The reaction equation is: SO2+2NaOH→Na2SO3+H2O

[0006] It can be seen from the above reaction equation that during the operation of the desulfurization tower, Na2SO3 is continuously produced, the Na2SO3 concentration of the Na2SO3 solution at the bottom of the desulfurization tower continues to increase, the Na2SO3 solution gradually becomes saturated and precipitates, and in winter when the outside temperature drops, the Na2SO3 solution becomes more saturated and precipitates, affecting the desulfurization effect of the desulfurization tower.

[0007] The existing desulfurization tower sewage discharge device is a valve that manually opens the drainage pump regularly. Since alkaline wastewater is corrosive to pipes and valves, the original direct discharge pipe is prone to long-term accumulation of wastewater, which causes corrosion of carbon steel pipes, valves, and pump bodies, leading to equipment failure and leakage.

[0008] Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. Utility Model Content

[0009] The purpose of the utility model is to provide a desulfurization wastewater discharge device to solve the problems existing in the background technology.

[0010] The purpose of the utility model is achieved through the following technical solutions:

[0011] A desulfurization wastewater discharge device comprises a tank body, wherein the upper liquid inlet of the tank body is connected to a wastewater pipe, the tank body is provided with a liquid level transmitter for monitoring the height of the waste liquid therein, the lower liquid outlet of the tank body is connected to a discharge pipe, the discharge pipe is provided with a sewage valve and a drainage pump, the sewage valve is closer to the tank body relative to the drainage pump; a bypass pipe is provided on the discharge pipe between the sewage valve and the drainage valve, and a clean water valve is provided on the bypass pipe; the clean water valve, sewage valve, drainage pump and liquid level transmitter are all electrically connected to a PLC controller; an anti-corrosion layer is provided on the inner wall of the discharge pipe; when the waste liquid in the tank body is lower than a set threshold, a cleaning mode is entered; when the waste liquid in the tank body is higher than a set threshold, a discharge mode is entered.

[0012] As a further improvement of an embodiment of the utility model, a flow electromagnetic switch is provided on the wastewater pipe, and the flow electromagnetic switch is electrically connected to the PLC controller.

[0013] As a further improvement of an embodiment of the utility model, a first pipeline is provided at the upper end of the tank body, one end of the first pipeline is connected to the air pump, and the other end of the first pipeline extends to the inside of the tank body.

[0014] As a further improvement of an embodiment of the utility model, a pressure transmitter is provided on the discharge pipe, the pressure transmitter is located between the sewage valve and the tank body, and the pressure transmitter is electrically connected to the PLC controller.

[0015] As a further improvement of an embodiment of the utility model, the anti-corrosion layer is any one of a polyamide epoxy magnetic paint layer, a cyanide condensation waterproof anti-corrosion coating layer or a strong acid and alkali resistant heavy anti-corrosion coating layer.

[0016] As a further improvement of one embodiment of the utility model, when the desulfurization wastewater discharge device is in the cleaning mode, the sewage valve is closed, the drainage pump is started, the clean water valve is opened, and the clean water in the bypass pipe flows into the drainage pipe at the rear section of the sewage valve to clean the drainage pipe and the drainage pump.

[0017] As a further improvement of one embodiment of the utility model, when the desulfurization wastewater discharge device is in the discharge mode, the sewage valve is opened, the drainage pump is started, the clean water valve is closed, and the waste liquid in the tank body flows into the drainage pipe and is discharged into the sewage treatment unit through the drainage pump.

[0018] As a further improvement of an embodiment of the utility model, the interval between the cleaning mode and the drainage mode is 6 hours, and the drainage time of the drainage mode is 5 minutes.

[0019] The above technical solution has the following beneficial effects: by applying the anti-corrosion layer and flushing with clean water regularly, the corrosion of alkaline wastewater on pipes and valves is reduced, and the probability of equipment failure and leakage is reduced. Through automatic control, the difficulty of operation is reduced, which is convenient for workers to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0022] Figure 1 This is a structural schematic diagram provided by the utility model.

[0023] Figure 2 This is a schematic diagram of PLC control wiring provided by the utility model.

[0024] Figure 3 This is a schematic diagram of the electrical principle provided by the utility model.

[0025] Figure 4 This is a schematic diagram of the daily alkali consumption at different discharge intervals provided by the utility model.

[0026] Figure 5 This is a schematic diagram of the exhaust gas SO2 emission at different emission intervals provided by the utility model (hours).

[0027] Figure 6 This is a schematic diagram of the exhaust SO2 emission at different emission times provided by the utility model (minutes).

[0028] In the figure: 1-tank body; 2-flow electromagnetic switch; 3-first pipeline; 4-liquid level transmitter; 5-pressure transmitter; 6-front section drainage pipe; 7-sewage valve; 8-bypass pipe; 9-clean water valve; 10-rear section drainage pipe; 11-drainage pump. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0032] Example

[0033] See also Figure 1-Figure 3 As shown, a desulfurization wastewater discharge device includes a tank body 1, the upper liquid inlet of the tank body 1 is connected to a wastewater pipe, and a flow electromagnetic switch 2 is arranged on the wastewater pipe; a liquid level transmitter 4 for monitoring the height of the waste liquid therein is arranged on the tank body 1; a first pipeline 3 is arranged on the upper end of the tank body 1, one end of the first pipeline 3 is connected to an air pump, and the other end of the first pipeline 3 extends to the inside of the tank body 1, and compressed air is provided to the tank body 1 through the first pipeline 3 for oxygenation, so that part of the sodium sulfite in the waste liquid is oxidized into sodium sulfate. The lower liquid outlet of the tank body 1 is connected to a drainage pipe, and a sewage valve 7 and a drainage pump 11 are arranged on the drainage pipe, wherein the sewage valve 7 is closer to the tank body 1 relative to the drainage pump. With the sewage valve 7 as a node, the drainage pipe between the tank body 1 and the sewage valve 7 is named as the front section drainage pipe 6, and the drainage pipe from the sewage valve 7 to the sewage treatment is named as the rear section drainage pipe 10. A pressure transmitter 5 is arranged on the front section drainage pipe 6. A bypass pipe 8 is provided on the liquid discharge pipe between the sewage valve and the drain valve, and a clean water valve 9 is provided on the bypass pipe 8 .

[0034] The desulfurization wastewater discharge device of this embodiment adopts a PLC controller as a control unit to realize the automated wastewater discharge of the desulfurization wastewater discharge device. Specifically, the above-mentioned PLC controller can be a conventional PLC controller, such as Siemens' S7-200, S7-1200, S7-1500 and other series, Mitsubishi's FX series, Q series, etc., which belong to conventional existing technologies and can be purchased on the market. The above-mentioned PLC controller is electrically connected to the clean water valve 9, the sewage valve 7, the drainage pump 11, the liquid level transmitter 4, the flow electromagnetic switch 2 and the pressure transmitter 5, so as to realize automated control of the discharge of the desulfurization wastewater discharge device.

[0035] In order to improve the corrosion resistance of the desulfurization wastewater discharge device in this embodiment, an anti-corrosion layer is provided on the inner wall of the discharge pipe. The anti-corrosion layer is any one of a polyamide epoxy magnetic paint layer, a cyanide waterproof anti-corrosion coating layer or a strong acid and alkali resistant heavy anti-corrosion coating layer.

[0036] Polyamide epoxy enamel: For example, Senta brand black polyamide epoxy enamel is a two-component self-drying paint with epoxy resin, various lead-free pigments, fillers, additives and solvents as the paint component B and special curing agent as the other component. It has the characteristics of hard paint film, good alkali resistance, fast drying performance, high adhesion and good anti-corrosion performance.

[0037] Cyanide waterproof and anti-corrosion coating: This is a polyurethane molecular synthetic material based on polyisocyanate, which is a two-component moisture-curing surface coating material.

[0038] Strong acid and alkali resistant heavy-duty anticorrosion coating: For example, the HS-990 high temperature resistant strong acid and alkali resistant heavy-duty anticorrosion coating produced by Chengdu Haoshi Paint Co., Ltd. is prepared by adding polymer special resins, special functional acid and alkali resistant pigments and fillers, additives, solvents, etc., and component B is a curing agent. It has extremely strong anticorrosion performance, and the paint film is a polymer coating with a mesh structure. The coating has excellent mechanical properties and chemical stability. The coating is hard, dense, and has good wear resistance. It has excellent acid, alkali, salt, various organic solvents, chemical corrosion performance and good adhesion.

[0039] When in use, the desulfurization wastewater discharge device has two modes. When the waste liquid in the tank body 1 is lower than the set threshold, it enters the cleaning mode; when the waste liquid in the tank body 1 is higher than the set threshold, it enters the discharge mode.

[0040] Specifically, when the desulfurization wastewater discharge device is in the discharge mode, the sewage valve 7 is opened, the drainage pump 11 is started, the clean water valve 9 is closed, and the waste liquid in the tank body 1 flows into the drainage pipe and is discharged into the sewage treatment unit through the drainage pump. When the desulfurization wastewater discharge device is in the cleaning mode, the sewage valve 7 is closed, the drainage pump 11 is started, the clean water valve 9 is opened, and the clean water in the bypass pipe 8 flows into the rear section drainage pipe 10 to clean the rear section drainage pipe 10 and the drainage pump. After 180 seconds, the clean water valve is closed, the drainage pump 11 stops, and the desulfurization wastewater discharge device enters the next cycle process.

[0041] The desulfurization wastewater discharge device of this embodiment adjusts the discharge time and discharge interval multiple times to ensure the desulfurization effect while reducing the usage of sodium hydroxide and saving costs.

[0042] For this purpose, the desulfurization wastewater discharge device of this embodiment is tested, and the test process is as follows:

[0043] First adjust the sewage discharge interval: when the discharge time is 3 minutes, the sewage discharge intervals are: 3h, 4h, 5h, 6h, 7h, 8h, and 9h respectively.

[0044] After finding the optimal emission interval, adjust the emission time: when the optimal emission interval is selected, the emission time is: 3min, 4min, 5min, 6min, 7min, 8min, 9min.

[0045] In order to reduce the possibility of contingency, error, etc., we conducted 5 groups of experimental comparisons:

[0046] Results and Analysis

[0047] 1. Comparison results of different discharge intervals are shown in Table 1 and Table 2:

[0048] 3h 4h 5h 6h 7h 8h 9h 1 15.1 12.9 10.8 8.1 7.5 7.2 6.7 2 14.9 12.6 10.7 8.0 7.5 7.1 6.5 3 14.8 12.8 10.6 8.2 7.4 7.2 6.5 4 15.0 12.7 10.6 8.1 7.5 7.0 6.6 5 14.9 12.9 10.8 8.0 7.4 7.1 6.7 Mean 14.94 12.78 10.7 8.08 7.46 7.12 6.6

[0049] Table 1: Daily alkali consumption at different discharge intervals ( Figure 4 )

[0050] 3h 4h 5h 6h 7h 8h 9h 1 20.9 24.9 27.9 30.1 45.3 57.6 70.2 2 20.5 24.6 27.6 30.5 45.1 57.9 70.1 3 20.7 24.3 27.8 30.4 44.8 58.1 69.7 4 20.4 24.8 27.4 30.1 44.9 58.5 69.7 5 20.8 24.3 27.9 30.4 45.2 57.7 70.5 Mean 20.66 24.58 27.72 30.3 45.06 57.96 70.04

[0051] Table 2: SO2 emissions from waste gas at different emission intervals ( Figure 5 )

[0052] from Figure 4 , Figure 5 It can be obtained that: when the discharge time is the same, the amount of alkali used will be reduced after the discharge interval is 7h, but the amount of alkali used per m 3 The SO2 contained in the gas increases sharply; the emission interval is 5 hours or earlier, and the SO2 per m 3 The increase in SO2 contained is not obvious, but the amount of alkali used increases too much. Considering the economic benefits and the qualified SO2 emissions, the best emission interval is 6 hours.

[0053] 2. The comparison results of different discharge times are shown in Table 3:

[0054] 3min 4min 5min 6min 7min 8min 9min 1 30.1 28.5 25.8 26.2 26.2 26.3 26.1 2 30.5 28.4 25.9 26.1 26.3 26.3 26.1 3 30.4 28.6 26.2 26.5 26.1 26.1 26.3 4 30.1 28.1 26.4 25.9 25.9 26.1 25.9 5 30.4 28.3 26.3 26.0 26.1 26.1 26.1 Mean 30.3 28.38 26.12 26.14 26.12 26.18 26.1

[0055] Table 3: Exhaust SO2 emissions at different emission times ( Figure 6 )

[0056] When the discharge interval is 6 hours and the discharge time is 5 minutes, every m 3 The improvement of SO2 contained is not obvious. Considering the power consumption and time cost of the equipment, the most appropriate emission time is 5 minutes.

[0057] The utility model reduces the corrosion of pipelines and valves by alkaline wastewater through the application of anti-corrosion layer and regular flushing with clean water, reduces the probability of equipment failure and leakage, and reduces the difficulty of operation through automatic control, making it convenient for workers to operate.

[0058] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A desulfurization wastewater discharge device, characterized in that: It includes a tank body, the upper liquid inlet of the tank body is connected to the wastewater pipe, the tank body is provided with a liquid level transmitter for monitoring the height of the waste liquid therein, the lower liquid outlet of the tank body is connected to a discharge pipe, the discharge pipe is provided with a sewage valve and a drainage pump, the sewage valve is closer to the tank body relative to the drainage pump; a bypass pipe is provided on the discharge pipe between the sewage valve and the drainage valve, and a clean water valve is provided on the bypass pipe; the clean water valve, sewage valve, drainage pump and liquid level transmitter are all electrically connected to a PLC controller; an anti-corrosion layer is provided on the inner wall of the discharge pipe; when the waste liquid in the tank body is lower than the set threshold, it enters a cleaning mode; when the waste liquid in the tank body is higher than the set threshold, it enters a drainage mode.

2. The desulfurization wastewater discharge device according to claim 1 is characterized in that: The wastewater pipe is provided with a flow electromagnetic switch, and the flow electromagnetic switch is electrically connected to the PLC controller.

3. The desulfurization wastewater discharge device according to claim 1 is characterized in that: A first pipeline is arranged at the upper end of the tank body, one end of the first pipeline is connected to the air pump, and the other end of the first pipeline extends into the interior of the tank body.

4. The desulfurization wastewater discharge device according to claim 1 is characterized in that: The discharge pipe is provided with a pressure transmitter, the pressure transmitter is located between the sewage valve and the tank body, and the pressure transmitter is electrically connected to the PLC controller.

5. The desulfurization wastewater discharge device according to claim 1 is characterized in that: The anti-corrosion layer is any one of a polyamide epoxy magnetic paint layer, a cyanide condensation waterproof anti-corrosion coating layer or a strong acid and alkali resistant heavy anti-corrosion coating layer.

6. The desulfurization wastewater discharge device according to claim 1 is characterized in that: When the desulfurization wastewater discharge device is in the cleaning mode, the sewage valve is closed, the drainage pump is started, the clean water valve is opened, and the clean water in the bypass pipe flows into the drainage pipe at the rear section of the sewage valve to clean the drainage pipe and the drainage pump.

7. The desulfurization wastewater discharge device according to claim 1 is characterized in that: When the desulfurization wastewater discharge device is in the discharge mode, the sewage valve is opened, the drainage pump is started, the clean water valve is closed, and the waste liquid in the tank body flows into the drainage pipe and is discharged into the sewage treatment unit through the drainage pump.

8. The desulfurization wastewater discharge device according to claim 1 is characterized in that: The interval between the cleaning mode and the draining mode is 6 hours, and the draining time of the draining mode is 5 minutes.

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