Steam treatment device of lime slaker

Abstract

The utility model relates to a steam treatment device of a lime slaker, which comprises a gas-collecting hood, an induced draft fan, a settling pond and a chimney, and the gas-collecting hood covers the lime slaker; an air inlet of the induced draft fan is communicated with an air outlet of the gas collecting hood through a pipeline I; a gas distribution pipeline is mounted at one end in the sedimentation tank, a gas inlet of the gas distribution pipeline is communicated with a gas outlet of the induced draft fan through a pipeline II, a plurality of gas distribution ports are formed in the gas distribution pipeline, a plurality of spray heads are mounted in the sedimentation tank, a three-phase separator is mounted at the other end in the sedimentation tank, and a gas discharge port is formed in the top end of the sedimentation tank; a supernatant discharge port is formed in the upper part of one side of the sedimentation tank; the chimney is installed on the gas discharge outlet, a condensation cavity and a discharge cavity are formed in the chimney, the top of the condensation cavity is communicated with the upper portion of the discharge cavity, and a plurality of heat exchange rings are arranged on the outer side of the chimney. The method has the beneficial effects that the risk of pipeline blockage is reduced; steam emission is reduced, and cyclic utilization of water resources is promoted.

Description

Technical Field

[0001] This utility model relates to the field of calcium hydroxide production technology, and in particular to a steam treatment device for a lime digester. Background Technology

[0002] In the production of calcium hydroxide, limestone is first calcined at high temperature to produce calcium oxide. Then, calcium oxide and water are digested in a lime digester to produce calcium hydroxide emulsion. The digestion reaction releases a large amount of heat, which heats some of the water into water vapor. However, the water vapor will also carry calcium oxide and calcium hydroxide. If the water vapor is directly released into the air, it will pollute the surrounding environment.

[0003] Current steam treatment equipment mainly uses rinsing to wash away calcium oxide and calcium hydroxide in the steam before releasing the steam. However, direct steam release will cause a large loss of water resources. Since the rinsing water contains calcium oxide and calcium hydroxide, if it is directly transported through pipelines, it will easily cause pipeline blockage. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned problems in the existing technology and provide a steam treatment device for a lime digester.

[0005] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0006] A steam treatment apparatus for a lime digester, comprising:

[0007] A gas collection hood is placed over the lime digester to collect the steam generated in the lime digester.

[0008] An induced draft fan, wherein the air inlet of the induced draft fan is connected to the air outlet of the air collection hood via a pipe;

[0009] A sedimentation tank is provided, with a gas distribution pipe installed at one end. The air inlet of the gas distribution pipe is connected to the air outlet of the induced draft fan via a second pipe. Several vertically connected air distribution ports are provided on the gas distribution pipe. Several spray nozzles for spraying water onto the gas distribution pipe are installed above the gas distribution pipe in the sedimentation tank. A three-phase separator is installed at the other end of the sedimentation tank. A gas discharge port is provided at the top of the sedimentation tank, and a supernatant discharge port is provided on the upper side of the sedimentation tank.

[0010] A chimney is installed on a gas exhaust port. The chimney has an annular condensation chamber and a cylindrical exhaust chamber. The exhaust chamber is located at the center of the condensation chamber. The top of the condensation chamber and the upper part of the exhaust chamber are connected through multiple vent holes opened on the chimney. Several heat exchange rings are arranged on the outer side of the chimney.

[0011] In the sedimentation tank, a longitudinal baffle is fixedly installed between the gas distribution pipe and the three-phase separator, and the bottom end of the longitudinal baffle is at the same horizontal height as the bottom end of the three-phase separator.

[0012] A long, narrow air vent is provided between the top of the longitudinal partition and the top of the inner side of the sedimentation tank, and the height of the air vent is 0.1 to 5 mm.

[0013] The gas discharge port and the supernatant discharge port are both located above the three-phase separator.

[0014] The sedimentation tank is provided with an overflow outlet on the upper side, which is located above the supernatant discharge outlet.

[0015] The sedimentation tank has a "7"-shaped water receiving trough installed directly below the gas outlet, and the bottom of the water receiving trough extends to the bottom of the three-phase separator.

[0016] The bottom of the sedimentation tank is designed as an inclined slope, and a sediment discharge port connected to the bottom of the slope is provided on the side of the sedimentation tank. A gate valve is installed on the sediment discharge port.

[0017] A spiral guide plate is fixedly connected to the condensation cavity.

[0018] The supernatant discharge port is connected to the water inlet of the lime digester via a water pipe.

[0019] The beneficial effects of this invention are as follows: the steam generated in the lime digester is distributed to the sedimentation tank through a combination of an induced draft fan and a gas distribution pipe. Water is sprayed from nozzles installed at the top of the sedimentation tank to wash the steam. Part of the steam is directly cooled and liquefied by the sprayed water, while the other part of the steam mixes with the sprayed water to form a mixed liquid that falls into the sedimentation tank. Under the action of a three-phase separator, the solid matter in the mixed liquid settles to the bottom of the sedimentation tank, and a supernatant is formed above the three-phase separator. The steam rises to the top of the sedimentation tank, and the supernatant is transported to the lime digester for recycling, reducing the risk of pipe blockage. The steam enters the condensation chamber of the chimney, where part of the steam is condensed into liquid, and the remaining steam is discharged through the exhaust chamber, reducing steam emissions and promoting the recycling of water resources. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the steam treatment device in this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the gas distribution pipe, three-phase separator, and nozzle installed in the sedimentation tank in this utility model;

[0023] Figure 3 This is a top view of the gas distribution pipe in this utility model.

[0024] Figure 4 This is a schematic diagram of the chimney structure in this utility model;

[0025] The following are the labels in the diagram: 1. Gas collection hood; 2. Exhaust fan; 3. Sedimentation tank; 3. Gas outlet; 301. Supernatant outlet; 302. Longitudinal partition; 303. Ventilation seam; 304. Overflow outlet; 305. Water collection trough; 306. Slope; 307. Sediment outlet; 308. Gate valve; 309. Chimney; 4. Condensation chamber; 401. Discharge chamber; 402. Vent hole; 403. Heat exchange ring; 404. Guide plate; 405. Downpipe; 406. Pipe 1; 5. Gas distribution pipe; 6. Gas distribution port; 601. Pipe 2; 7. Nozzle; 8. Three-phase separator; 9. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 4 As shown, a steam treatment device for a lime digester includes a gas collection hood 1, an induced draft fan 2, a sedimentation tank 3, and a chimney 4.

[0028] A gas collection hood 1 covers the lime digester to collect the steam generated in the lime digester. The air inlet of the induced draft fan 2 is connected to the air outlet of the gas collection hood 1 through pipe 1 5. A gas distribution pipe 6 is installed at one end of the sedimentation tank 3. The air inlet of the gas distribution pipe 6 is connected to the air outlet of the induced draft fan 2 through pipe 2 7. Several vertically connected gas distribution ports 601 are opened on the gas distribution pipe 6.

[0029] The operation of the induced draft fan 2 will draw the steam generated in the lime digester into the gas collection hood 1, and then send it into the gas distribution pipe 6 through pipe 1 and pipe 2. The steam entering the gas distribution pipe 6 diffuses from the gas distribution port 601 to the sedimentation tank 3.

[0030] In the sedimentation tank 3, above the gas distribution pipe 6, there are multiple nozzles 8 that spray water onto the gas distribution pipe 6. The nozzles spray water to wash the steam. Some of the steam is directly cooled and liquefied by the spray water, while the other part of the steam mixes into the spray water and becomes a mixed liquid that falls into the sedimentation tank.

[0031] A three-phase separator 9 is installed at the other end of the sedimentation tank 3. Under the action of the three-phase separator 9, the solid matter in the mixed liquid settles to the bottom of the sedimentation tank 3, forms a supernatant above the three-phase separator 9, and the steam rises to the top of the sedimentation tank 3.

[0032] A longitudinal baffle 303 is fixedly installed in the sedimentation tank 3 between the gas distribution pipe 6 and the three-phase separator 9. The bottom end of the longitudinal baffle 303 is at the same horizontal height as the bottom end of the three-phase separator 9. The longitudinal baffle 303 is used to prevent the mixed liquid from flowing directly to the top of the three-phase separator 9 without passing through the separation effect of the three-phase separator.

[0033] A long, narrow ventilation slot 304 is provided between the top of the longitudinal partition 303 and the top of the inner side of the sedimentation tank 3. The height of the ventilation slot 304 is 0.1~5mm. In this embodiment, the height of the ventilation slot 304 is 0.3mm. The ventilation slot 304 is provided between the top of the longitudinal partition 303 and the top of the inner side of the sedimentation tank 3 to prevent excessive air pressure in the area above the gas distribution pipe in the sedimentation tank, which would prevent the steam in the gas distribution pipe from flowing out normally.

[0034] A gas exhaust port 301 is provided at the top of the sedimentation tank 3, and the gas exhaust port 301 is located above the three-phase separator 9. A chimney 4 is installed on the gas exhaust port 301. The chimney 4 is provided with an annular condensation chamber 401 and a cylindrical exhaust chamber 402. The top of the exhaust chamber 402 is connected to the outside atmosphere. The exhaust chamber 402 is located at the center of the condensation chamber 401. The top of the condensation chamber 401 and the upper part of the exhaust chamber 402 are connected through multiple vent holes 403 opened on the chimney 4. Several heat exchange rings 404 are provided on the outside of the chimney 4. The heat exchange rings 404 increase the contact area between the outer wall of the chimney 4 and the external environment, thereby improving the cooling effect of the condensation chamber 401. A spiral guide plate 405 is fixed in the condensation chamber 401, which causes the steam to rise spirally in the condensation chamber 401, increases the flow path of the steam in the condensation chamber 401, promotes the condensation of steam in the condensation chamber 401, reduces steam emissions, and promotes the recycling of water resources.

[0035] A supernatant discharge port 302 is provided on the upper side of one side of the sedimentation tank 3, and the supernatant discharge port 302 is located above the three-phase separator 9. The supernatant discharge port 302 is connected to the water inlet of the lime digester through a water pipe.

[0036] An overflow port 305 is also provided on the upper side of the sedimentation tank 3. The overflow port 305 is located above the supernatant discharge port 302. When the liquid level in the sedimentation tank 3 overflows the overflow port, the excess water is discharged from the overflow port.

[0037] A "7"-shaped water receiving trough 306 is installed in the sedimentation tank 3 directly below the gas emission port 301, with the bottom of the trough 306 extending below the three-phase separator 9. A funnel-shaped downpipe 406 is installed at the bottom of the emission chamber 402, with the bottom of the downpipe 406 extending into the water receiving trough 306. The condensate flowing down from the chimney 4 falls into the water receiving trough 306, and then flows down the trough into the sedimentation tank below the three-phase separator 9, preventing the condensate from dripping directly into the supernatant above the three-phase separator and re-contaminating the supernatant.

[0038] The bottom of the sedimentation tank 3 is designed as an inclined slope 307, and a sediment discharge port 308 connected to the bottom of the slope 307 is provided on the side of the sedimentation tank 3. A gate valve 309 is installed on the sediment discharge port 308. The sediment accumulates along the slope towards the sediment discharge port 308, and then the gate valve 309 is opened periodically to discharge the sediment.

[0039] In this embodiment, the induced draft fan is a Qingfeng brand model QF-0044. The nozzle is a stainless steel hollow cone nozzle, which sprays a hollow cone-shaped mist, which is beneficial for the mixing of droplets and steam and for capturing solid substances in the steam.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A steam treatment device for a lime digester, characterized in that, include: A gas collection hood is placed over the lime digester to collect the steam generated in the lime digester. An induced draft fan, wherein the air inlet of the induced draft fan is connected to the air outlet of the air collection hood via a pipe; A sedimentation tank is provided, with a gas distribution pipe installed at one end. The air inlet of the gas distribution pipe is connected to the air outlet of the induced draft fan via a second pipe. Several vertically connected air distribution ports are provided on the gas distribution pipe. Several spray nozzles for spraying water onto the gas distribution pipe are installed above the gas distribution pipe in the sedimentation tank. A three-phase separator is installed at the other end of the sedimentation tank. A gas discharge port is provided at the top of the sedimentation tank, and a supernatant discharge port is provided on the upper side of the sedimentation tank. A chimney is installed on a gas exhaust port. The chimney has an annular condensation chamber and a cylindrical exhaust chamber. The exhaust chamber is located at the center of the condensation chamber. The top of the condensation chamber and the upper part of the exhaust chamber are connected through multiple vent holes opened on the chimney. Several heat exchange rings are arranged on the outer side of the chimney.

2. The steam treatment apparatus according to claim 1, characterized in that: A longitudinal baffle is fixedly installed in the sedimentation tank between the gas distribution pipe and the three-phase separator, and the bottom end of the longitudinal baffle is at the same horizontal height as the bottom end of the three-phase separator.

3. The steam treatment apparatus according to claim 2, characterized in that: A long, narrow air vent is provided between the top of the longitudinal partition and the top of the inner side of the sedimentation tank, and the height of the air vent is 0.1~5mm.

4. The steam treatment apparatus according to claim 1, characterized in that: Both the gas discharge port and the supernatant discharge port are located above the three-phase separator.

5. The steam treatment apparatus according to claim 1, characterized in that: An overflow outlet is also provided on the upper side of one side of the sedimentation tank, and the overflow outlet is located above the supernatant discharge outlet.

6. The steam treatment apparatus according to claim 1, characterized in that: A "7"-shaped water receiving trough is installed in the sedimentation tank directly below the gas outlet, and the bottom of the water receiving trough extends to the bottom of the three-phase separator.

7. The steam treatment apparatus according to claim 1, characterized in that: The bottom of the sedimentation tank is set as an inclined slope, and the side of the sedimentation tank is provided with a sediment discharge port connected to the bottom of the slope. A gate valve is installed on the sediment discharge port.

8. The steam treatment apparatus according to claim 1, characterized in that: A spiral guide plate is fixedly connected to the condensation chamber.

9. The steam treatment apparatus according to claim 1, characterized in that: The supernatant discharge port is connected to the water inlet of the lime digester via a water pipe.

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