CN205084586U - It cleans device system to melt sulphur waste gas - Google Patents

Abstract

The utility model discloses an it cleans device system to melt sulphur waste gas, wash the cold water system including melting sulphur groove, sink, draught fan, circulation, the gas vent that melts the sulphur groove links to each other with the air inlet of sink, and the gas vent of sink links to each other with the entry of draught fan, and the circulation is washed the cold water system and is connected with the sink and loops in, and it has the adder -subtractor to circulate to wash still to link in the cold water system. The utility model has the advantages that with washing liquid cyclic utilization, subdue the waste liquid and discharged the pressure of dealing with, with alkali lye adjustment washing liquid pH value, make the assimilation effect obviously improve, showing and reducing the tail gas peculiar smell, carry out cooling to the washing, when improving the assimilation effect, still restrained volatile materials's diffusion, multistage washing, micropore spray, have improved the cleaning and purifying effect, reduce consumption of power, sink convenient to detach clearance etc..

Description

Molten sulfur waste gas cleaning device system

technical field

The utility model relates to a washing and purifying device system for molten sulfur waste gas, in particular to a device system for absorbing, washing and purifying the waste gas produced in the heating and melting process of solid sulfur.

Background technique

At present, in the sulfur acid industry, sulfur recovery, sulfur granulation, sulfur flakes and other fields, there are purification processes for molten sulfur waste gas. Taking the application in the sulfuric acid industry as an example, solid sulfur raw materials in the form of powder, granule, flake or block need to be heated, melted and filtered by steam before being sent to the next process for use. Because sulfur contains water, volatile organic compounds, organic acids, etc., the waste gas formed by these impurities in the process of melting sulfur will cause adverse effects on the surrounding environment.

In the prior art, most of the treatment methods for molten sulfur waste gas are to use induced draft fans to introduce the waste gas into the water washing tower for washing and purification. The disadvantages of this method are analyzed as follows:

Disadvantage 1: There are many exposure points such as manholes and breathing ports in the sulfur melting tank, which increases the load of the induced draft fan. When feeding materials, due to overload, the exhaust gas will diffuse from the exposure points to the atmosphere;

Disadvantage 2: The ambient air is inhaled from the opening during the air extraction process of the induced draft fan, and after mixing with the exhaust gas, the temperature of the exhaust gas is reduced. Although the induced air pipe is a large-diameter heating sleeve of DN600/700, there is still sublimated sulfur condensing to block the pipe ;

Disadvantage 3: The spray density of the water washing tower is not enough, and the washing effect is not ideal. Some manufacturers increase the packing layer in the tower to improve it, but it is very easy to be blocked by sublimated sulfur condensation, and it is not easy to clean;

Disadvantage 4: The washing water is mostly discharged directly, and the reuse rate of the washing water is low, which increases the load of wastewater treatment;

Disadvantage 5: The water washing absorption rate of insoluble or insoluble acid gas in the exhaust gas is not high.

Utility model content

Purpose of the utility model: In view of the above problems, the purpose of the utility model is to provide a washing and purification device system that can improve the purification effect of pollutants in molten sulfur waste gas and save energy and reduce consumption.

Technical solution: A sulfur melting waste gas cleaning device system, including a sulfur melting tank, a washing tank, an induced draft fan, and a circulating washing cold water system;

The exhaust port of the sulfur melting tank is connected to the air inlet of the washing tank, the exhaust port of the washing tank is connected to the inlet of the induced draft fan, and the circulating cold water system is connected to the washing tank to form a loop, and an alkali adding device is also connected in the cold water system for circulating washing.

The circulating cold water washing system includes a circulation pool, a circulation pump, a cooler, and a supply waterway. The drain port of the washing tank is connected to the circulation pool, and the circulation pump is connected to the inlet of the circulation pool and the cooler. The liquid outlet, the supply waterway and the liquid outlet of the cooler are connected in parallel to the washing tank, and the alkali adding device is connected to the circulation pool.

The outlet of the induced draft fan is connected with a submerged uniform distributor. The uniform distributor is immersed in the liquid surface of the circulation pool to form a liquid seal, so that the exhaust gas can be recovered twice, and the water mist can be further separated by the impact of the exhaust gas and the liquid.

Because the induced draft fan draws air to make the inside of the molten sulfur tank be in a negative pressure state, a tongue-and-groove hole cover is arranged at the air inlet outside the sulfur molten tank to cover the air inlet, so as to minimize the inhalation by the air inlet. Ambient air volume.

The air inlet of the sulfur melting tank is arranged close to the feed port of the sulfur melting tank, which can inhibit the exhaust gas from diffusing from the feed port of the sulfur melting tank to the system after sulfur melting.

The washing tank is a baffle tank with a spray pipe. The spray pipe is arranged above the baffle section in the front middle of the baffle tank. The spray pipe is provided in multiple stages. The spray pipe Multiple rows of spray holes are provided on the top.

The spray holes are set on the upper circumferential apex of the spray pipe, and based on the lower circumferential apex of the spray pipe, they are opened along the circumferential direction with a deflection angle and are symmetrically distributed on the left and right axes. The spray holes below the circumferential direction of the spray pipes are arranged alternately in each row in a diamond shape. Make sure that the entire exhaust gas channel can be sprayed with washing liquid to prevent the exhaust gas from short-circuiting.

The spray holes are microholes with a diameter φ≤2mm. Atomize the washing liquid to increase the spray density.

The washing tank is sealed with the weight of its top cover, and the top cover adopts a soft sealing strip, which is convenient for disassembly and cleaning.

Beneficial effect: compared with the prior art, the utility model has the advantages of:

1. The washing liquid is recycled, reducing the pressure of waste liquid discharge and disposal, and the washing water volume is greatly reduced;

2. Adjust the pH value of the washing liquid with lye, so that the absorption effect is significantly improved, and the tail gas odor is significantly reduced;

3. Cool down the washing, while improving the absorption effect, it also inhibits the diffusion of volatile substances;

4. The baffle-type washing tank enables the exhaust gas to undergo multi-stage washing, which improves the washing and purification effect;

5. The spray pipe adopts microporous spray, through the atomization and diffusion of the washing liquid, the gas-liquid contact surface is improved, which can reduce the circulation volume and reduce the power consumption;

6. The structure of the washing tank has been changed for easy disassembly and cleaning;

7. The liquid-immersed gas uniform distributor is used to realize the secondary absorption of exhaust gas, and the outlet wind pressure of the induced draft fan can be changed by adjusting the liquid level of the circulation pool, so as to realize the fine adjustment of the induced air volume.

Description of drawings

Fig. 1 is the utility model device system structural representation;

Figure 2 is the front view of the washing tank, with the front cover removed;

Figure 3 is a top view of the washing tank, with the top cover removed;

Figure 4 is a left view of the washing tank, with the left cover removed;

Fig. 5 is a sectional end view of A-A in Fig. 3;

Fig. 6 is one of the B-directed expanded views of Fig. 5;

Fig. 7 is the second expanded view along the direction B of Fig. 5 .

detailed description

Below in conjunction with accompanying drawing and specific embodiment, further set forth the utility model, should be understood that these embodiments are only used for illustrating the utility model and are not intended to limit the scope of the utility model, after having read the utility model, those skilled in the art will understand this utility model The modifications of various equivalent forms of the utility model all fall within the scope defined by the appended claims of the present application.

The utility model is a molten sulfur waste gas cleaning device system, which mainly provides solutions according to the following practical problems:

1. The water consumption of molten sulfur waste gas washing and purification is large, which also affects the discharge of waste water up to the standard, but if the amount of washing water is reduced, the purification effect is not ideal;

2. After the washing liquid is recycled, the heat brought in by the exhaust gas will cause the temperature of the washing liquid to rise, which is a disadvantageous factor for washing absorption, and a cooler needs to be added to the system;

3. The scrubbing solution for molten sulfur exhaust gas is acidic, and the odor of exhaust gas increases with the increase of acidity;

4. The sublimated sulfur in the exhaust gas will condense on the wall of the device during the washing and cooling process, which will affect the performance of the device.

As shown in accompanying drawing 1, for this reason, the cleaning device system of molten sulfur exhaust gas of the present utility model mainly comprises melting sulfur tank 1, washing tank 2, induced draft fan 3, circulating washing cold water system, alkali adding device 4, circulating washing cold water system It includes a circulation pool 5-1, a circulation pump 5-2, a cooler 5-3, and a supply waterway 5-4.

The sulfur melting tank 1 is provided with a feed inlet 1-1, an air inlet 1-2, and an exhaust outlet 1-3. Inside the sulfur melting tank 1, there are stirring paddles 1-4 and the positions where the air inlet 1-2 is opened. It is close to the feed port 1-1 to suppress the diffusion of waste gas from the feed port of the sulfur melting tank to the post-sulphur melting system. The air inlet 1-2 is the air outlet of the molten sulfur tank in the existing device system. Because the utility model uses the induced draft fan 3 to draw air to make the inside of the molten sulfur tank 1 be in a negative pressure state, it will actually flow to the molten sulfur Ambient air is introduced into the tank 1, so a tenon-groove hole cover 1-5 is provided outside the sulfur melting tank 1 at the air inlet 1-2 to shield the air inlet 1-2, so as to minimize the 1 The amount of ambient air sucked by the air inlet 1-2 due to internal negative pressure. In this regard, a small fan with a total pressure of 1.5KW, a total pressure of 400Pa, and an air intake of 2000m ³ /h was tested from the inlet 1-2. The inlet of the small fan was made of DN125 carbon steel pipe, and the outlet of the small fan was immersed in water for absorption. , the exhaust flow rate of the test device is 40m/s, and the test conditions are as follows: 1. The diffusion amount of the exhaust gas from the feed port 1-1 of the sulfur melting tank 1 is obviously reduced; 2. The sulfur vapor brought out with the exhaust gas is on the small fan blades The solid sulfur condensed into pine needles will affect the suction volume and dynamic balance of the small fan; 3. There is condensed water on the inner wall of the small fan pipe, and there is no sublimated sulfur condensation to block the pipe; 4. The pH value of the liquid seal water gradually drops, and the temperature Gradually rising, and the exhaust odor is also gradually increasing. The enlightenment drawn from this test is: 1. Compared with the exhaust gas flow rate of the existing device which is 10m/s, increasing the gas flow rate can suppress the condensation of sublimated sulfur on the pipe wall; Conducive to exhaust gas purification.

Based on the structure and test results of the aforementioned sulfur melting tank 1 and the deficiencies of existing devices, the follow-up structure of the device system will continue to be designed.

The washing tank 2 is a baffle tank with a spray pipe 2-4, which is used to spray and wash the molten sulfur exhaust gas. The exhaust port 1-3 of the sulfur melting tank 1 and the air inlet 2-1 of the washing tank 2 The exhaust port 2-2 of the washing tank 2 is connected with the inlet of the induced draft fan 3, and the outlet of the induced draft fan 3 is connected with a submerged uniform distributor 6, and the uniform distributor 6 is immersed in the liquid surface of the circulation pool 5-1 to form a liquid Seal, so that the tail gas can undergo secondary absorption. The induced draft fan 3 introduces the sulfur melting waste gas in the sulfur melting tank 1 into the washing tank 2 .

The drain port 2-3 of the washing tank 2 is connected to the circulation pool 5-1, the circulation pump 5-2 is connected to the liquid inlet 5-31 of the circulation pool 5-1 and the cooler 5-3, and the supply waterway 5-4 is connected to the cooling tank 5-1. The drain port 5-32 of the device 5-3 is connected in parallel to the spray pipe 2-4, and the alkali adding device 4 is connected to the circulation pool 5-1. The circulation tank 5-1 is used to collect the washing liquid, the circulation pump 5-2 is used to circulate the washing liquid, the cooler 5-3 is used to reduce the temperature of the washing liquid, and the alkali adding device 4 is used to adjust the pH value of the washing liquid.

As shown in accompanying drawings 2 to 4, the tank body of the washing tank 2 is a cuboid. According to the amount of exhaust gas to be treated and the gas velocity, a number of baffles 2-5 are arranged inside the tank body along the direction of exhaust gas flow. There are multi-stage spray pipes 2-4, and the spray pipes are arranged above the baffle section along the front middle of the waste gas flow, and not above the baffle section along the exhaust flow to the rear, so that the rear baffle section mainly serves as a buffer The airflow separates the water mist. Each level of spray pipe can be controlled independently, and the spray water volume can be increased step by step according to the actual operation situation.

The top stop surface of the baffle plate and the top stop surface of the tank body need to be kept clean and smooth, and soft rubber gaskets should be pasted. The bottom surface of the movable top cover 2-6 should also be kept smooth and clean. Sealing, on the one hand, prevents the ambient air from being sucked into the system, reduces the power consumption of the induced draft fan, and on the other hand, prevents the exhaust gas from short-circuiting in the tank.

The washing tank 2 is equipped with a liquid level gauge to prevent the liquid accumulation in the tank from affecting the air passage, and an exhaust balance hole is opened at an appropriate position on the liquid outlet 2-3 pipeline of the washing tank 2 to prevent the pipeline from forming an air blockage.

As shown in accompanying drawings 5 to 7, there are multiple rows of spray holes 2-41 provided on the spray pipe 2-4. One of the rows is set at the top apex a of the spray pipe, which is distributed in a straight line and at equal intervals, and is set in consideration of the installation interval between the flange connection of the spray pipe and the movable top cover; in addition, the bottom apex b of the spray pipe is Benchmark, along the circumferential direction of the spray pipe, it is deflected incrementally at a certain deflection angle α, and it is symmetrically distributed on the left and right axes, and each row is staggered forward and backward in a rhombus distribution. The selection of the deflection angle is based on the tank size of the washing tank 2 For design, the deflection angle is 30°, that is, the spray hole is deflected 30° to the left in the circumferential direction based on point b, opened 60° to the left in the circumferential direction based on point b, and is symmetrical about the left and right axes. The spray hole 2-41 adopts a microporous structure, atomizes the washing liquid, and increases the spray density. The aperture is set according to the spray density and dispersion coefficient, and the optimal aperture is φ1.5mm. The purpose of the arrangement structure of such spray holes is to ensure that the washing liquid can be sprayed on the entire exhaust gas channel, so as to prevent the exhaust gas from short-circuiting.

Since the washing liquid inevitably entrains a small amount of solid impurities, the main body of the spray pipe is connected by a flange, which is convenient for disassembly and dredging.

The type selection of the circulating pump needs to match the structural size of the spray pipe to ensure the flow and pressure required for the spraying of the washing liquid.

The device system of the utility model also includes temperature, pressure, liquid level and other detection instruments for measuring the operation effect of the monitoring system such as washing liquid and exhaust gas, and also includes process pipelines of different specifications and models for connection and valves for controlling and regulating materials, etc. As well as the auxiliary facilities to ensure the normal operation of the device system, remote automatic control can be used.

The following describes in detail the cleaning process of molten sulfur waste gas using the device system of the present invention.

The liquid level of the circulating tank 5-1 is replenished to the range of 50-150mm with the fresh water of the supply waterway 5-4, and this range is set according to the uniform distributor 6 at the outlet of the induced draft fan 3.

Open the inlet valve 5-21 of the circulation pump 5-2, start the circulation pump 5-2, then gradually open the outlet valve 5-22 of the circulation pump 5-2 and the inlet valve 2-71,2 of the spray pipe 2-4 -72, ..., 2-7n, the washing liquid is sent to the washing tank 2 after being cooled by the cooler 5-3 by the circulation pump 5-2.

The temperature of the washing liquid entering the washing tank 2 should be controlled to be less than or equal to 40°C. Although the utility model suppresses the volatilization of acid gas by adding alkali, the high temperature will also desorb this part of the gas, and the saturated vapor pressure of the washing liquid will also decrease. Rising, affecting the scene environment. This temperature control can regulate the cooling water consumption to guarantee by the cooling water import and export valve 5-33,5-34 of cooler 5-3.

The amount of washing liquid is determined according to the temperature of the exhaust gas at the inlet and outlet of the washing tank 2, and the water inlet valves 2-71, 2-72, ..., 2-7n of the spray pipe 2-4 are adjusted in sequence, and the circulating pump 5- 2 outlet pressure index, control the circulating washing liquid pressure ≥ 0.15MPa, to ensure the spray effect of spray pipe 2-4. But it should be noted that the liquid level of the washing tank 2 should not exceed the index range, that is, the liquid level of the washing tank should be controlled to be ≤250mm, so as to prevent the flow of gas from being hindered. The gas temperature after washing is ≤40°C.

Use the induced draft fan 3 to introduce the water vapor, sulfur vapor, other volatile components and air generated during the sulfur melting process in the sulfur melting tank 1 into the self-created washing tank 2. The key point of control is to ensure that the gas phase side pressure of the sulfur melting tank 1 is ≤ -50Pa , the pressure can be roughly adjusted by adjusting the induced air volume of the induced draft fan 3 through the opening of the valve 1-6 on the pipeline connecting the exhaust port 1-3 of the sulfur melting tank 1 and the air inlet 2-1 of the washing tank 2 , the liquid level of the circulation pool 5-1 can also be adjusted through the opening of the valve 2-8 on the pipeline connecting the drain port 2-3 of the washing tank 2 and the circulation pool 5-1 so as to change the outlet wind of the induced draft fan 3 Compression can be used to fine-tune the induced air volume.

After the cycle washing is established, liquid caustic soda is added dropwise to the circulation pool 5-1 through the alkali adding device 4 to ensure that the pH value of the cycle washing liquid is ≥9.

The control indicators set for the cleaning process in this embodiment are obtained through actual operation in combination with the operating cost and the impact of waste liquid discharge on the water body at the plant boundary, but are not limited thereto. Corresponding adjustments can be made according to different devices or plant conditions. As a process, it can also be applied to other devices in the field.

In order to facilitate system cleaning and emergency response to circulation pump failure, the supply waterway 5-4 is used as a fresh water emergency pipeline, and fresh water can be used temporarily to wash the exhaust gas, and the fresh water is discharged into the trench from the overflow of the circulation pool 5-1.

It is necessary to flush and clean irregularly according to the amount of sediment in the circulation pool and the fouling of the washing tank and cooler.

In order to further improve the absorption effect, an even distributor 6 is installed at the outlet of the induced draft fan 3, and the air outlet of the even distributor 6 determines the liquid seal height according to the total pressure of the induced draft fan, and the nozzle of the air outlet is made into a sawtooth shape. On the one hand, the exhaust gas is absorbed twice, and on the other hand, the water mist is further separated by the impact of the exhaust gas and the liquid.

The following table lists a set of control indicators adopted according to the above cleaning process:

.

Claims (9)

1. a molten sulphur waste gas decontaminating apparatus system, is characterized in that: comprise sulfur melting groove, sink, air-introduced machine, circulation wash chilled water system;

The exhaust outlet of described sulfur melting groove is connected with the air inlet of described sink, the exhaust outlet of described sink is connected with the entrance of described air-introduced machine, chilled water system is washed in described circulation and described sink is connected to form loop, and described circulation is washed in chilled water system and is also connected with adder-subtractor.

2. molten sulphur waste gas decontaminating apparatus system according to claim 1, it is characterized in that: described circulation is washed chilled water system and comprised circulatory pool, circulating pump, cooler, supply water route, the leakage fluid dram of described sink is connected into described circulatory pool, described circulating pump is communicated with the inlet of described circulatory pool and described cooler, described supply water route is in parallel with the leakage fluid dram of described cooler is connected into described sink, and described adder-subtractor is connected into described circulatory pool.

3. molten sulphur waste gas decontaminating apparatus system according to claim 1, is characterized in that: the outlet of described air-introduced machine is connected with immersion uniform device.

4. molten sulphur waste gas decontaminating apparatus system according to claim 1, is characterized in that: in described sulfur melting groove outside, air inlet place is provided with tongue-and-groove nibs lid and covers air inlet.

5. molten sulphur waste gas decontaminating apparatus system according to claim 1, is characterized in that: the air inlet of described sulfur melting groove arranges the charging aperture being close to described sulfur melting groove.

6. molten sulphur waste gas decontaminating apparatus system according to claim 1, it is characterized in that: described sink is the baffling groove with shower, described shower is arranged at above the baffling section of described baffling groove front middle part, described shower is provided with multistage, described shower offers and arranges spray apertures more.

7. molten sulphur waste gas decontaminating apparatus system according to claim 6, it is characterized in that: summit in the circumference that described spray apertures is opened in described shower, and offer with the week of described shower downward summit for benchmark circumferentially increases progressively with deflection angle deflection and be that Y-axis symmetry is uniform, and be opened in the week spray apertures downwards of described shower, the often staggered distribution that assumes diamond in shape between row.

8. molten sulphur waste gas decontaminating apparatus system according to claim 6, is characterized in that: described spray apertures is micropore, aperture φ≤2mm.

9. molten sulphur waste gas decontaminating apparatus system according to claim 1, is characterized in that: described sink seals with the deadweight of its top cover.