CN206817447U - The dead steam recovery system of sulfuric acid apparatus - Google Patents

Abstract

The utility model discloses a exhaust steam recovery system of a sulfuric acid plant. The exhaust steam recovery system comprises: a recovery boiler, a flash tank, a venturi tube, a deaerator and a circulating water pool; an outlet of the flash tank and an air inlet of the venturi tube The gas outlet of the Venturi tube is connected to the inlet of the deaerator; the outlet of the deaerator is connected to the circulating pool through the drainage pipe; the vent of the deaerator is connected to the outside world; the recovery boiler is equipped with a drainage pipe , the outlet end of the drainage pipe is connected to the spray head of the flash tank through the pipe; the spray head is located on the inner wall of the flash tank; the water inlet of the recovery boiler is connected to the circulating pool through the water inlet pipe with a water pump and a valve. The utility model can effectively recover exhausted steam, increase the amount of condensed water, and save steam.

Description

Waste steam recovery system of sulfuric acid plant

technical field

The invention belongs to the field of chemical equipment, and in particular relates to a exhaust steam recovery system of a sulfuric acid plant.

Background technique

Sulfuric acid is generally produced by combustion or calcination to produce sulfur dioxide gas (acid gas). Sulfur dioxide gas is catalyzed by catalyst (V2O5) to generate sulfur trioxide gas, and then absorbed by 98% concentrated sulfuric acid to generate finished sulfuric acid.

The tail gas contains a large amount of exhaust steam that releases thermal potential energy. Due to the low pressure, low density and slow flow rate of exhaust steam, it is difficult to recover. However, the exhaust steam in the existing sulfuric acid plant is directly discharged, causing a large loss of heat energy, affecting the surrounding environment, and accompanied by venting noise. The exhaust steam produced per hour is 0.24+0.06=0.30 tons discharged into the atmosphere, causing steam waste. In addition, the boiler even discharges the water directly, resulting in a serious waste of resources. The flash tank of the sulfuric acid plant is prone to the phenomenon of rising resistance.

Utility model content

The utility model provides a exhaust steam recovery system of a sulfuric acid plant, which can effectively recover exhaust steam, increase the amount of condensed water, and save steam.

The technical scheme proposed by the utility model:

The exhaust steam recovery system of the sulfuric acid plant, the exhaust steam recovery system includes: a recovery boiler, a flash tank, a venturi tube, a deaerator and a circulating water pool; the outlet of the flash tank and the inlet of the venturi tube The gas outlet of the venturi tube is connected with the inlet of the deaerator; the water outlet of the deaerator passes into the circulating pool through the drainage pipe; the vent of the deaerator communicates with the outside world ;

The recovery boiler is provided with a continuous drainage pipeline, and the water outlet end of the continuous drainage pipeline is connected to the water spray head of the flash tank through a pipeline; the water spray head is located on the inner wall of the flash tank; The water inlet is connected with the circulating water pool through a water inlet pipeline with a water pump and a valve.

Further, the venturi tube includes: a first venturi tube and a second venturi tube; the deaerator includes a first deaerator and a second deaerator; the flash tank has two outlets, and are respectively connected with the air inlets of the first Venturi tube and the second Venturi tube; the gas outlets of the first Venturi tube and the second Venturi tube are respectively connected with the first deaerator and the The inlets of the second deaerator are connected; the water outlets of the first deaerator and the second deaerator lead into the circulating water pool through separate pipes.

Further, a filter membrane is provided at the water outlet end of the continuous drainage pipe.

Further, the water spray head is a mist spray head.

Further, the water spray head is located on the inner wall of the flash tank in a spiral shape.

Further, the orientation direction of the water spray head is at an angle of 45 degrees with the vertical horizontal plane.

Further, the water spray head is connected with the compressed gas tank through the gas pipeline.

Compared with the prior art, the utility model has at least one of the following beneficial effects:

1. The utility model adopts a Venturi tube economizer to utilize the continuous drainage of the sulfuric acid plant, and recycle exhaust steam, effectively saving energy and water.

2. The utility model can avoid the clogging of the nozzle on the top of the flash tank and the stuffing in the tower, and reduce the resistance of the flash tank.

3. The utility model can effectively recover low-grade heat energy and reduce the steam consumption of the deaerator.

4. The water in the continuous drainage and circulating water pool of the utility model can be effectively recycled, and the reuse rate of water sources can be enhanced.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

In order to make the purpose, technical solutions and beneficial effects of the present utility model clearer, the preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings, so as to facilitate the understanding of technical personnel.

Example 1

As shown in Figure 1, the exhaust steam recovery system of a sulfuric acid plant is characterized in that the exhaust steam recovery system includes: a recovery boiler 1, a flash tank 2, a venturi tube 3, a deaerator 4 and a circulating water pool 5; The tail gas of the sulfuric acid plant passes in the flash tank, and the outlet of the flash tank 2 is connected with the inlet 301 of the Venturi tube 3; The inlet 401 is connected; the water outlet 402 of the deaerator 4 passes into the circulating pool 5 through the drainage pipe 14; the vent 403 of the deaerator 4 communicates with the outside world;

The recovery boiler 1 is provided with a drainage pipeline 7, and the water outlet 701 of the drainage pipeline 7 is connected to the water spray head 8 of the flash tank 2 through the pipeline 6; The inner wall of the tank 2; the water inlet 101 of the recovery boiler 1 is connected to the circulating water pool 5 through the water inlet pipe 9 having a water pump 901 and a valve 902 .

The tail gas of the sulfuric acid plant contains a large amount of steam waste, which is recovered and utilized through the flash tank, venturi tube and deaerator in sequence. The utility model uses a Venturi tube, which can effectively enhance the condensation and recovery of steam, and is beneficial to improve the recovery efficiency of exhausted steam.

Because the recovery boiler drainage is relatively clean, and the content of suspended solids, sediment, algae and other substances is very small, it can effectively improve the use of boiler drainage instead of adding process water to the flash tank, which can supplement water and spray water in the tail suction tower of the flash tank It becomes very clean, and it is not easy to block the nozzle and pump inlet filter plate, reduce the deposition of dirty substances in the flash tank filler, and help alleviate the problem of the increase in the resistance of the flash tank. At the same time, the waste caused by continuous drainage is avoided. At the same time, the water in the continuous drainage and circulating pools can be effectively recycled, and the reuse rate of water sources can be enhanced.

Example 2

On the basis of Example 1, the Venturi tube 3 includes: a first Venturi tube 10 and a second Venturi tube 11; the deaerator 4 includes a first deaerator 12 and a second deaerator device 13; the flash tank 2 has two outlets, and is connected with the inlet 301 of the first Venturi tube 10 and the second Venturi tube 11 respectively; the first Venturi tube 10 and the The gas outlet 302 of the second venturi tube 11 is connected with the inlet 401 of the first deaerator 12 and the second deaerator 13 respectively; the water outlet 402 of the first deaerator 12 and the second deaerator 13 Pass through the pipeline 6 into the circulating pool 5 respectively.

The utility model divides the gas passing through the flash tank into two branches for processing, which not only reduces the burden pressure of the Venturi tube, but also effectively improves the efficiency of exhaust gas treatment.

Example 3

On the basis of Examples 1-2, the outlet end 701 of the continuous drainage pipe 7 is provided with a filter membrane. By installing a filter membrane at the water outlet, it can effectively reduce the impurities in the continuous drainage and reduce the resistance in the flash tank.

Example 4

On the basis of Examples 1-3, the water spray head 8 is a mist spray head. Through the mist nozzle, the cooling effect of the flash tank can be effectively enhanced.

Example 5

On the basis of Examples 1-4, the water spray head 8 is located on the inner wall of the flash tank 2 in a spiral shape. The spray head is located on the inner wall of the flash tank in a spiral shape, which can reduce the dead angle of spraying and enhance the cooling effect.

Example 6

On the basis of Examples 1-5, the direction of the water spray head 8 is at an angle of 45 degrees to the vertical horizontal plane. The setting of the angle can reduce the dead angle of spraying and enhance the cooling effect.

Example 7

On the basis of Examples 1-6, the water spray head 8 is connected with the compressed gas tank through the gas pipeline. Through the setting of compressed air, the flow rate of spraying and drainage can be effectively increased, the dead angle of spraying can be reduced, and the cooling effect can be enhanced.

Claims (7)

1. the dead steam recovery system of sulfuric acid apparatus, it is characterised in that described dead steam recovery system includes：Recovery boiler（1）, dodge Steaming pot（2）, Venturi tube（3）, oxygen-eliminating device（4）And circulating water pool（5）；Described flash tank（2）Outlet and Venturi tube（3） Air inlet（301）It is connected；Described Venturi tube（3）Gas outlet（302）With oxygen-eliminating device（4）Import（401）It is connected Connect；The oxygen-eliminating device（4）Delivery port（402）Pass through drainage pipeline（14）It is passed through circulating water pool（5）It is interior；The oxygen-eliminating device（4） Blow vent（403）Communicated with the external world；

Described recovery boiler（1）Provided with platoon waterpipe（7）, described platoon waterpipe（7）Water side (701) pass through pipe Road（6）With flash tank（2）Fountain head（8）It is connected；Described fountain head（8）Positioned at flash tank（2）Inwall；The recovery pot Stove（1）Water inlet（101）By with water pump（901）And valve（902）Inlet channel（9）With circulating water pool（5）It is connected Connect.

2. the dead steam recovery system of sulfuric acid apparatus according to claim 1, it is characterised in that described Venturi tube（3） Including：First Venturi tube（10）With the second Venturi tube（11）；Described oxygen-eliminating device（4）Including the first oxygen-eliminating device（12）With Two oxygen-eliminating devices（13）；Described flash tank（2）Have two outlet, and respectively with the first Venturi tube（10）With the second literary mound In manage（11）Air inlet（301）It is connected；The first described Venturi tube（10）With the second Venturi tube（11）Gas outlet （302）Respectively with the first oxygen-eliminating device（12）With the second oxygen-eliminating device（13）Import（401）It is connected；First oxygen-eliminating device（12） With the second oxygen-eliminating device（13）Delivery port（402）Pass through pipeline respectively（6）It is passed through circulating water pool（5）It is interior.

3. the dead steam recovery system of sulfuric acid apparatus according to claim 1, it is characterised in that the platoon waterpipe（7） Water side (701) be provided with filter membrane.

4. the dead steam recovery system of sulfuric acid apparatus according to claim 1, it is characterised in that described fountain head（8）For Fine spray shower nozzle.

5. the dead steam recovery system of sulfuric acid apparatus according to claim 1, it is characterised in that described fountain head（8）It is in Helical form is located at flash tank（2）Inwall.

6. the dead steam recovery system of sulfuric acid apparatus according to claim 1, it is characterised in that described fountain head（8）'s Direction and vertical level are in 45 degree of angles.

7. the dead steam recovery system of sulfuric acid apparatus according to claim 1, it is characterised in that described fountain head（8）It is logical Gas pipeline is crossed with compression gas tank to be connected.