A water seal device for pulp mill evaporation, cooking high concentration odor conveying system

Abstract

The utility model relates to pulp and paper mill equipment technical field, specifically disclose a kind of water seal equipment for pulp evaporating, cooking high-concentration odor conveying system, including the water seal tank being arranged between odor tank outlet and combustion point, water seal tank includes the tank body of long waist type being placed horizontally, the baffle is vertically installed in one side in tank body, the height of baffle is higher than half of tank body height;Water inlet pipe is installed on the upper portion of tank body;Odor outlet pipe is installed on the upper end of tank body, odor outlet pipe is located above the highest point of baffle far from water inlet pipe side;Odor inlet pipe is installed on the upper end of tank body close to water inlet side, after its lower end is inserted into water in the tank body after being penetrated by odor inlet pipe, the lower end of odor inlet pipe nozzle is more than 200mm below water level in tank body;Tank body is set as negative pressure. When extreme situation combustion end pipeline explodes, water seal tank can effectively block flame spread to tank, avoid huge harm tank explosion.

Description

Technical Field

[0001] This utility model belongs to the field of safety equipment for pulp and paper mills, specifically involving a water seal device for conveying high-concentration odorous gases in pulp mill evaporation and cooking systems. It is connected between the odorous gas tank and the combustion end. In extreme cases, if the combustion end pipeline explodes, the water seal device can effectively block the spread of flames to the tank, thus avoiding the highly dangerous tank explosion. Background Technology

[0002] Over the past 20 years, numerous odor explosions have occurred in pulp mills both domestically and internationally, resulting in casualties and significant economic losses. Among these, explosions in evaporation wastewater tanks account for the largest proportion. Therefore, the proper functioning of the water seal tank connecting the odor system to the tank and the combustion point is crucial. The water seal tank utilizes a water seal between the odor inlet and outlet to achieve a flame-retardant function. However, improper liquid level control can cause the water seal tank to fail, potentially leading to an explosion in extreme cases. Utility Model Content

[0003] The purpose of this invention is to provide a water seal tank for conveying high-concentration odorous gases in pulp plant evaporation and cooking systems. It innovatively uses water surface liquid seal to achieve fire-retardant purposes, and adopts two optimized designs: serrated pipe opening and partition mesh, which effectively reduce air bubbles and improve fire-retardant performance.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A water seal device for conveying high-concentration odorous gas in a pulp plant evaporation and cooking system includes a water seal tank arranged between the outlet of the odorous gas tank and the combustion point. The water seal tank includes a horizontally placed elongated tank body, and a baffle is vertically installed on one side of the tank body. The height of the baffle is higher than half the height of the tank body. A clean water inlet pipe is installed on the upper part of the tank, through which clean water is continuously injected into the cavity between the tank and the baffle at a small flow rate; an odor outlet pipe is installed at the upper end of the tank, and the odor outlet pipe is located above the highest point on the side of the baffle away from the clean water inlet pipe. An odor inlet pipe is installed at the upper end of the tank near the clean water inlet. The odor inlet pipe passes through the tank and its lower end extends into the clean water. The lower end of the odor inlet pipe is more than 200mm lower than the clean water level in the tank. The tank is set to negative pressure.

[0005] As described above, this utility model incorporates a water seal between the odor tank and the combustion point, effectively preventing the flame from spreading to the tank in abnormal situations such as backfire at the combustion point, thus providing a safety protection function. Specifically, there is a height difference of over 200mm between the lower end of the odor inlet pipe and the highest point of the baffle (the water surface); clean water is continuously injected, with the injected water volume exceeding the water loss due to gas entrainment; excess water can be discharged through the drain outlet, ensuring the water level remains at least 200mm above the lower end of the odor inlet pipe to guarantee flame-retardant performance.

[0006] Preferably, the baffle is located at 3 / 4 of the horizontal length of the tank, and the height of the baffle is 200mm higher than the horizontal centerline of the tank.

[0007] As shown above, the baffle is used to maintain the liquid level in the tank above the lower end of the odor inlet pipe. Excess water can flow down along the highest point of the baffle and be discharged from the drain outlet.

[0008] Optionally, a partition net is horizontally installed between the tank body and the baffle, and the height of the partition net is half the height of the tank body.

[0009] Optionally, the lower end of the odor inlet pipe passes through a partition mesh, and its lower end opening is serrated.

[0010] As described above, when odorous gas enters the water in the water seal tank, bubbles rise to the surface. When the bubbles are large, the odorous gas backfires, and the flame can still travel through the large bubbles to the odorous gas inlet, causing the water seal tank to fail. This invention designs the lower end of the odorous gas inlet pipe with a serrated shape, which can effectively convert large bubbles into safer small bubbles. Simultaneously, a dividing mesh is installed below the liquid surface to further reduce bubbles, effectively preventing the water seal tank from failing.

[0011] Preferably, the clean water inlet pipe is installed 100mm above the liquid level in the tank.

[0012] From above, clean water is continuously injected at a small flow rate into the cavity between the tank and the baffle through the clean water inlet pipe to compensate for the water loss due to odor and maintain liquid level balance.

[0013] Optionally, a drain outlet is installed at the bottom of the tank below the odor outlet pipe.

[0014] The drain outlet promptly removes excess water injected into the clean water inlet pipe, preventing foul odors from entering the water.

[0015] Optionally, a level gauge is installed on one side of the tank exterior.

[0016] As mentioned above, when odor continuously enters the water in the water seal tank and then exits, due to the high flow rate, some water can be carried away, causing the water level in the water seal tank to continuously drop. When the liquid level is lower than the odor inlet pipe, the water seal tank will fail. This utility model includes a liquid level balance design, which can ensure that the liquid level in the water seal tank remains constant, resulting in high reliability.

[0017] Optionally, an observation hole is installed on the tank.

[0018] From the above, the contents of the container and the size of the bubbles can be observed through the observation hole.

[0019] Optionally, there may be one or more odor inlet pipes.

[0020] As a result, the water seal tank can accommodate a variety of odor pipelines, thus saving on investment costs.

[0021] Compared with the prior art, the present invention has the following advantages: the whole device has a simple structure, is easy to operate, and can be remotely monitored in the control room. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the water seal trough structure of this utility model.

[0023] Explanation of reference numerals in the attached diagram: 1. Tank body; 2. Baffle; 3. Clean water inlet pipe; 4. Odor inlet pipe; 5. Odor outlet pipe; 6. Separator; 7. Drain outlet; 8. Level gauge; 9. Clean water. Detailed Implementation

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] A water seal device for conveying high-concentration odorous gases during pulp evaporation and cooking in pulp plants, such as Figure 1As shown, a water seal trough is arranged between the outlet of the odor tank and the combustion point. The water seal trough includes a horizontally placed elongated tank 1. A baffle 2 is vertically installed on one side of the tank 1. The shape of the baffle 2 matches the shape of the tank and its height is higher than half the height of the tank. The baffle 2 is used to maintain the liquid level in the tank 1 above the lower end of the odor inlet pipe 4. Excess water can flow down along the highest point of the baffle 2 and be discharged from the drain outlet 7. A clean water inlet pipe 3 is installed on the upper part of the tank 1. Clean water is continuously injected into the cavity between the tank 1 and the baffle 2 through the clean water inlet pipe 3 at a small flow rate to compensate for the water loss due to odor entrainment and maintain liquid level balance. An odor inlet pipe 4 is installed at the upper end near the clean water inlet pipe 3. The odor inlet pipe 4 penetrates the tank body 1 and its lower end extends into the clean water 9. The lower end of the odor inlet pipe is at least 200mm lower than the clean water level in the tank (the highest point of the baffle 2). When the combustion point explodes / backfires, the flame reaches above the liquid surface in the water seal tank. Due to the low compressibility of the liquid, even if the explosion gas pressure is high, the continuous injection of clean water ensures that the injected water volume is greater than the water lost due to gas entrainment. Excess water can be discharged through the drain outlet, and the liquid level does not drop significantly. The flame is effectively isolated above the liquid surface and will not backflow to the odor inlet, preventing the tank from exploding and ensuring flame-retardant performance. Furthermore, there can be one or multiple odor inlet pipes. The water seal tank can accept various odor pipelines to save investment costs.

[0027] In a preferred embodiment of this utility model, the baffle 2 is located at 3 / 4 of the horizontal length of the tank body 1, and the height of the baffle 2 is 200mm higher than the horizontal center line of the tank body 1; the clean water inlet pipe 3 is installed on the tank body 1 at a position 100mm above the liquid surface.

[0028] In this invention, an odor outlet pipe 5 is installed at the upper end of the tank body 1. The odor outlet pipe 5 is connected to the tank body 1 and is located above the highest point on the right side of the baffle 2. This minimizes the amount of water carried away. After the odor overflows from the surface of the clean water and collects, it flows from the odor outlet pipe 5 to the combustion point. A drain outlet 7 is installed at the bottom of the tank body 1 below the odor outlet pipe 5. The drain outlet 7 promptly drains away any excess water injected into the clean water inlet pipe 3, preventing the odor from mixing into the water.

[0029] In a preferred embodiment of this utility model, the lower end of the odor inlet pipe 4 is serrated. The odor from the tank enters through the odor inlet pipe 4. The tank body 1 is set to negative pressure, and the gas easily escapes from the opening of the odor inlet pipe 4. The serrated lower end of the odor inlet pipe 4 can effectively convert large bubbles into safer small bubbles. A separator 6 is horizontally installed between the tank body 1 and the baffle 2. The height of the separator 6 is half the height of the tank body 1. The separator 6 can be made of 5-10 mesh and SS316 material. The separator 6 is used to further separate the bubbles after the odor enters the water into more small bubbles, which significantly enhances the water seal performance and the flame-retardant function.

[0030] In a preferred embodiment of this invention, a level gauge 8 is installed on the outer side of the tank 1. The level gauge 8 transmits the liquid level signal of the water seal tank to the DCS control room, allowing operators to monitor the liquid level in the water seal tank in real time. If the liquid level is abnormal, it can be addressed immediately; for example, if the liquid level is too high, reduce the amount of clean water injected; if the liquid level is too low, increase the amount of clean water injected. An observation hole is installed on the tank 1, allowing observation of the internal conditions and bubble size. In practical applications, observation through the observation hole shows that the bubbles of odorous gas are significantly reduced after passing through the serrated nozzle.

[0031] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of this utility model.

Claims

1. A water seal device for conveying high-concentration odorous gases from pulp mill evaporation and cooking processes, comprising a water seal tank arranged between the outlet of the odorous gas tank and the combustion point, characterized in that, The water seal tank includes a horizontally placed, elongated tank body, with a baffle vertically installed on one side of the tank body, the height of which is greater than half the height of the tank body; A clean water inlet pipe is installed on the upper part of the tank, through which clean water is continuously injected into the cavity between the tank and the baffle at a small flow rate; an odor outlet pipe is installed at the upper end of the tank, and the odor outlet pipe is located above the highest point on the side of the baffle away from the clean water inlet pipe. An odor inlet pipe is installed at the upper end of the tank near the clean water inlet. The odor inlet pipe passes through the tank and its lower end extends into the clean water. The lower end of the odor inlet pipe is more than 200mm lower than the clean water level in the tank. The tank is set to negative pressure.

2. The water seal equipment for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, The baffle is located at 3 / 4 of the horizontal length of the tank, and the height of the baffle is 200mm higher than the horizontal centerline of the tank.

3. The water seal equipment for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, A partition net is horizontally installed between the tank body and the baffle, and the height of the partition net is half the height of the tank body.

4. The water seal equipment for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 3, characterized in that, The lower end of the odor inlet pipe passes through a partition mesh, and its lower end opening is serrated.

5. The water seal device for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, The clean water inlet pipe is installed 100mm above the liquid level on the tank.

6. The water seal device for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, A drain outlet is installed at the bottom of the tank below the odor outlet pipe.

7. The water seal device for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, A level gauge is installed on one side of the tank exterior.

8. The water seal device for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, An observation port is installed on the tank.

9. The water seal device for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, The odor inlet pipe is configured as one.

10. The water seal device for conveying high-concentration odorous gases from pulp mill evaporation and cooking systems according to claim 1, characterized in that, The odor inlet pipe is configured to be multiple.

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