CN213791016U

CN213791016U - Steam jet type urea dissolving device and dissolving and storing system

Info

Publication number: CN213791016U
Application number: CN202022575434.8U
Authority: CN
Inventors: 高良海
Original assignee: Shanghai Luyuan Control Equipment Co ltd
Current assignee: Shanghai Luyuan Control Equipment Co ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-07-27
Anticipated expiration: 2030-11-09

Abstract

The utility model discloses a steam jet formula urea dissolving device and dissolve storage system belongs to flue gas denitration reductant system technical field. The quantitative feeding device comprises a dissolving tank, wherein an ejector used for feeding is connected to the dissolving tank, one end, far away from the dissolving tank, of the ejector is connected with a quantitative steam feeding assembly, and two sides of the ejector are respectively connected with a urea quantitative feeding assembly and a quantitative water supplementing assembly. The exit fixedly connected with hybrid tube of sprayer, the hybrid tube is kept away from the one end of sprayer and is stretched into the inside of dissolving tank, fixedly connected with drain pipe on the lateral wall of dissolving tank. The utility model has the advantages of simple structure, high preparation efficiency, small occupied area, and saved equipment cost and operation cost.

Description

Steam jet type urea dissolving device and dissolving and storing system

Technical Field

The utility model relates to a steam jet formula urea dissolving device and dissolve storage system belongs to flue gas denitration reductant system technical field.

Background

In a system for carrying out denitration treatment on flue gas, ammonia is a commonly used reducing agent, and the removal efficiency of nitric oxide in the flue gas is highest. The preparation method of ammonia comprises the steps of preparing ammonia by evaporating liquid ammonia, preparing ammonia by evaporating ammonia water and preparing ammonia by hydrolyzing/pyrolyzing urea, belongs to chemical dangerous goods due to flammability and explosiveness of the liquid ammonia and the ammonia water, and has higher requirements on transportation and storage. In contrast, urea is chemically stable, non-toxic, and easier to transport and store. The urea solution used in the urea hydrolysis/pyrolysis process is typically formulated from dry urea and water under the action of a certain amount of heat. The existing urea solution preparation method mainly comprises the steps of pouring dry urea into a dissolving tank filled with hot water by using equipment such as a bucket elevator, dissolving the urea in the water by heating and stirring to obtain a urea solution, and then conveying the urea solution to a storage tank for storage and standby. The method for preparing the urea solution by pre-preparation has long time consumption, complicated procedures, large volume of the required dissolving tank, civil foundation construction, large floor area and high construction cost.

Disclosure of Invention

An object of the utility model is to overcome prior art's not enough, provide a steam injection formula urea dissolving device and dissolve storage system.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a steam injection formula urea dissolving device, includes the dissolving tank, be connected with the sprayer that is used for the feeding on the dissolving tank, the one end that the dissolving tank was kept away from to the sprayer is connected with the ration and advances the steam subassembly, the both sides of sprayer are connected with urea ration feeding subassembly and ration moisturizing subassembly respectively. The exit fixedly connected with hybrid tube of sprayer, the hybrid tube is kept away from the one end of sprayer and is stretched into the inside of dissolving tank, fixedly connected with drain pipe on the lateral wall of dissolving tank.

Through adopting the sprayer to carry out the feeding, the pressure steam that advances the steam subassembly and provide by the ration is as the power supply of sprayer, makes the throat of sprayer form strong negative pressure to absorb the urea granule that urea ration feeding subassembly provided and get into the sprayer, the urea granule absorbs the heat rapidly after contacting with steam and dissolves, and steam both as the heat source and the water source at urea dissolving in-process, is favorable to improving heat exchange efficiency, and then improves the dissolution efficiency of urea granule. Meanwhile, through the quantitative feeding of the urea particles and the steam, the urea particles and the steam are mixed and dissolved to form a urea solution with a preset concentration, the efficient online continuous batching while the preparation is carried out can be realized, and the problems of long preparation time consumption and large equipment volume in the prior art are solved. Urea granule and steam by the sprayer spun mix in the mixing tube and dissolve, both do benefit to and promote contact and collision between urea granule and the steam, promote going on of dissolving process, are favorable to preventing urea granule from forming the raise dust again, and in the in-process of preparing urea solution, the end of mixing tube is located the below the liquid level of urea solution basically, and urea granule that has not dissolved in the mixing tube directly gets into the urea solution and carries out further dissolution. The utility model discloses a urea dissolving device need not to set up agitator, heating member and exhaust fan in the dissolving tank, and simple structure is favorable to reducing equipment cost and running cost.

Furthermore, a partition board is fixedly connected in the dissolving tank, the extending direction of the partition board is consistent with that of the mixing pipe, and the partition board is positioned between the mixing pipe and the liquid outlet pipe. Through set up the baffle between mixing tube and drain pipe, on the one hand, be favorable to increasing the interior liquid disturbance of dissolving tank, be favorable to urea solution's misce bene, on the other hand, be favorable to keeping the end of mixing tube below urea solution's liquid level, the urea granule of complete dissolution can directly be followed the end of mixing tube and further dissolved in getting into urea solution in the mixing tube.

Furthermore, a plurality of baffles which are staggered with each other are fixedly connected in the mixing pipe along the extension direction of the mixing pipe. Through set up a plurality of baffles that crisscross each other in the mixing tube, be favorable to increasing the collision of urea granule and steam on the baffle, promote the mixing between urea granule and the steam and dissolve.

Further, urea ration feeding subassembly includes the feeder hopper, the outlet side fixedly connected with rotary feeder of feeder hopper, one side fixedly connected with powder conveyer pipe that rotary feeder kept away from the feeder hopper is kept away from to rotary feeder, the one end that rotary feeder was kept away from to the powder conveyer pipe is connected with the sprayer, the air supply of fixedly connected with supply air on the powder conveyer pipe, fixedly connected with powder flowmeter on the powder conveyer pipe. After the dry urea is poured into the feed hopper, the urea enters the powder conveying pipe along the rotary feeder, and the urea particles are sucked into the ejector by the negative pressure generated at the throat part of the ejector, so that the urea particles are conveyed. A reserved interface can be further arranged on the powder conveying pipe, and when a tank car with a pressure tank with a pneumatic conveying device is used as a transport vehicle for transporting dry urea, the discharge pipe of the transport vehicle can be directly connected with the reserved interface, and the dry urea is directly loaded by the transport tank car.

Further, the quantitative steam inlet assembly comprises a steam tank and a steam pipe, the steam pipe is connected between the steam tank and the ejector, and a steam flow meter, a steam regulating valve and a steam shutoff valve are fixedly connected to the steam pipe. According to the concentration of the required urea solution, the proportion of urea particles to steam is calculated and related, and the urea particles and steam are fed in the same proportion by utilizing a steam regulating valve and a steam flow meter.

Furthermore, a pressure detection device is fixedly connected to the steam pipe. Because the steam that transports to the sprayer is the steam of taking the pressure, set up the pressure detection device on the steam pipe and conveniently monitor the steam pressure of transporting in the steam pipe, and then in time turn-off the steam pipe when the problem appears, improve the safety and stability of equipment operation.

Further, ration moisturizing subassembly includes moisturizing case and moisturizing pipe, moisturizing pipe connection is between moisturizing case and sprayer, fixedly connected with moisturizing flowmeter, moisturizing governing valve and moisturizing shutoff valve on the moisturizing pipe.

The utility model also provides a steam jet formula urea dissolves storage system, include as above urea dissolving device, still include the holding vessel, drain pipe and holding vessel intercommunication, fixedly connected with heating member in the holding vessel. In urea solution by the preparation of urea dissolving device gets into the holding vessel along the drain pipe, the heating member in the holding vessel is urea solution heating heat preservation, is favorable to keeping the dissolved state of urea solution, and the convenience is taken at any time.

Further, the dissolving tank with the lateral wall of holding vessel fixedly connected with temperature measuring device and level measurement device respectively, the lateral wall of dissolving tank still fixedly connected with density measurement device. The urea solution in the dissolving tank and the storage tank is monitored in real time by using the temperature measuring device and the liquid level measuring device, so that the feeding of the ejector and the heating in the storage tank are adjusted and controlled, the concentration of the urea solution in the dissolving tank is monitored by using the density measuring device, and the density of the urea solution is ensured to accord with a preset value.

Furthermore, the horizontal position of holding vessel is higher than the dissolving tank, fixedly connected with overflow pipe on the dissolving tank, overflow pipe and drain pipe are located the same one side of dissolving tank, overflow pipe and drain pipe intercommunication. The prepared urea solution in the dissolving tank can automatically flow into the storage tank along the liquid outlet pipe under the action of gravity, so that pumping equipment is omitted. When the liquid level in the dissolving tank is too high, the urea solution in the dissolving tank can also flow into the storage tank through the overflow pipe.

The utility model has the advantages that:

1) through utilizing the sprayer to spray urea granule and steam in to dissolving tank to set up the hybrid tube at the blowout end of sprayer, make urea granule and steam dissolve at the intraductal flash mixed of hybrid tube, be favorable to improving urea solution's preparation efficiency, simplify urea dissolving device's structure, reduce equipment cost and running cost.

2) Through set up the baffle in dissolving tank, set up the baffle in the hybrid tube, be favorable to increasing mixing, the collision of urea granule and steam, promote the disturbance of urea solution, and then be favorable to the quick dissolving of urea granule and the homogeneous mixing of urea solution.

3) The utility model discloses a urea dissolves storage system simple structure, the urea solution of preparing in the dissolving tank is carried to the holding vessel and is preserved, and heating member in the holding vessel can keep warm for the urea solution heating, maintains the stable state of urea solution.

Drawings

Fig. 1 is a schematic view of an internal structure of a first embodiment of the present invention.

Fig. 2 is a schematic diagram of an internal structure of a second embodiment of the present invention.

Fig. 3 is a schematic view of an external structure of a third embodiment of the present invention.

In the figure, 1, a dissolving tank; 2. an ejector; 3. a mixing tube; 4. a liquid outlet pipe; 5. a partition plate; 6. a baffle plate; 7. a feed hopper; 8. a rotary feeder; 9. a powder conveying pipe; 10. a powder flowmeter; 11. a steam tank; 12. a steam pipe; 13. a steam flow meter; 14. a steam regulating valve; 15. a steam shutoff valve; 16. a pressure detection device; 17. a water replenishing tank; 18. a water replenishing pipe; 19. a water replenishing flow meter; 20. a water replenishing regulating valve; 21. a water replenishing shutoff valve; 22. a storage tank; 23. a heating member; 24. a temperature measuring device; 25. a liquid level measuring device; 26. an overflow pipe; 27. a gas source; 28. a density measuring device.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

Example one

As shown in fig. 1, the embodiment provides a steam injection formula urea dissolving device, including dissolving tank 1, be connected with the sprayer 2 that is used for the feeding on dissolving tank 1, be connected with the ration at 2 upper ends of sprayer and advance the steam subassembly, be connected with urea ration feeding subassembly and quantitative moisturizing subassembly respectively in 2 both sides of sprayer, the ration is advanced the steam subassembly and can is pressed steam for 2 provisions of sprayer, urea ration feeding subassembly can provide the urea granule for 2 ration of sprayer, the quantitative moisturizing subassembly then provides the demineralized water according to steam provides the condition ration replenishment. During feeding, steam with pressure enters the ejector 2, negative pressure is formed at the throat part of the ejector 2, urea particles provided by a urea quantitative feeding assembly connected to the throat part of the ejector 2 are sucked into the ejector 2, and the steam and the urea particles are sprayed out from the lower end of the ejector 2 together. The lower extreme fixedly connected with mixing tube 3 of sprayer 2, the upper end and the sprayer 2 of mixing tube 3 are connected, and the lower extreme stretches into the inside of dissolving tank 1, reachs the position that is close to dissolving tank 1 bottom, along a plurality of crisscross baffles 6 of mixing tube 3's extending direction fixedly connected with each other in mixing tube 3 to increase collision and the mixture between steam and the urea granule. Still fixedly connected with and the unanimous baffle 5 of 3 extending direction of hybrid tube in dissolving tank 1, fixedly connected with drain pipe 4 on the lateral wall of dissolving tank 1, baffle 5 is located between hybrid tube 3 and drain pipe 4. The top end of the dissolving tank 1 can be further provided with a vent pipe, the side wall of the dissolving tank 1 close to one side of the mixing pipe 3 can be communicated with a supplementary liquid discharge pipe, and after the urea solution is prepared, the urea solution on the left side of the partition plate 5 can be discharged by the supplementary liquid discharge pipe.

As shown in FIG. 1, the urea quantitative feeding assembly of this embodiment includes a feeding hopper 7, a rotary feeder 8 is fixedly connected to the lower portion of the feeding hopper 7, a powder conveying pipe 9 is fixedly connected to the lower portion of the rotary feeder 8, one end of the powder conveying pipe 9 is fixedly connected to the rotary feeder 8, and the other end of the powder conveying pipe 9 is connected to the throat portion of the injector 2, so that the powder entering the powder conveying pipe 9 is sucked into the injector 2 under the action of the negative pressure at the throat portion of the injector 2. Fixedly connected with air supply 27 of supply air on powder conveyer pipe 9, air supply 27 here can be air-blower or compressed air, and air supply 27 is connected in the tip of powder conveyer pipe 9 left side branch pipe, provides the carrier for the transport of powder, and the tip on powder conveyer pipe right side is connected to sprayer 2, and fixedly connected with powder flowmeter 10 is gone back on powder conveyer pipe 9, the ration feeding of convenient control and realization powder. The powder conveying pipe 9 is also provided with a reserved interface, when a tank truck with a pressure tank with a pneumatic conveying device is used as a transport vehicle for transporting dry urea, an unloading pipe of the transport vehicle can be directly connected with the reserved interface, unpackaged pure urea particles loaded and transported in the transport tank truck enter the ejector 2 along the powder conveying pipe 9 under the negative pressure of the ejector 2 to prepare urea solution, and the operation is convenient and labor-saving. The quantitative steam inlet assembly includes a steam tank 11 and a steam pipe 12, the steam pipe 12 is connected between the steam tank 11 and the injector 2, and steam in the steam tank 11 enters the injector 2 along the steam pipe 12. The steam pipe 12 is fixedly connected with a steam flow meter 13, a steam regulating valve 14 and a steam shutoff valve 15, so that the delivery quantity of the steam can be conveniently regulated and measured. A pressure detection device 16 is also fixedly connected to the steam pipe 12 for monitoring the steam pressure delivered within the steam pipe 12. The quantitative water supplementing assembly comprises a water supplementing tank 17 and a water supplementing pipe 18, the water supplementing pipe 18 is connected between the water supplementing tank 17 and the ejector 2, and a water supplementing flowmeter 19, a water supplementing regulating valve 20 and a water supplementing shutoff valve 21 are fixedly connected to the water supplementing pipe 18.

When the device is used, pressurized steam enters the ejector 2 along the steam pipe 12, urea particles are added into the hopper, the urea particles enter the powder conveying pipe 9 through the rotary feeder 8 and are conveyed into the ejector 2 under the negative pressure of the ejector 2, the feeding amount of the urea particles in the same time is calculated according to the rotating speed of the rotary feeder 8, the steam adjusting valve 14 on the steam pipe 12 is adjusted according to the concentration of required urea solution, the steam and the urea particles are synchronously conveyed into the ejector 2 in proportion, and when the proportion of the steam does not meet the set proportion as much as possible, water can be supplemented into the ejector 2 through the water supplementing tank 17. Urea particles and steam are mixed in the ejector 2 and then sprayed into the mixing pipe 3, and are collided and mixed under the obstruction of the plurality of baffles 6 in the mixing pipe 3, so that the urea particles are quickly dissolved in the contact with the steam. The urea solution, the steam and part of undissolved urea particles directly enter the urea solution at the bottom of the dissolving tank 1 from the lower end of the mixing pipe 3 and are uniformly mixed on the left side of the partition plate 5. After the urea solution level on the left side of the partition board 5 is higher than the partition board 5, the urea solution flows into the space on the right side of the partition board 5 and flows out along the liquid outlet pipe 4, and the urea solution is configured.

Example two

As shown in fig. 2 and fig. 3, this embodiment provides a steam injection type urea dissolving and storing system, including the urea dissolving device of the first embodiment, further including a storage tank 22, the liquid outlet pipe 4 on the dissolving tank 1 is communicated with the storage tank 22, the horizontal position of the storage tank 22 is higher than the dissolving tank 1, that is, the dissolving tank 1 is located above the storage tank 22, so that the urea solution in the dissolving tank 1 can flow into the storage tank 22 by itself without a pumping device. A heating element 23 is fixedly connected in the storage tank 22, where the heating element 23 may be an electric heating tube or a steam heating tube, and can heat the urea solution, and the heating element 23 of this embodiment is an electric heating tube. In order to enhance the monitoring of the urea solution in the dissolving tank 1 and the storage tank 22, a temperature measuring device 24 and a liquid level measuring device 25 are fixedly connected to the side walls of the dissolving tank 1 and the storage tank 22 respectively, and a density measuring device 28 is also fixedly connected to the side wall of the dissolving tank 1 for monitoring the temperature and the liquid level of the urea solution in the dissolving tank 1 and the storage tank 22 and the density of the urea solution in the dissolving tank 1. Still be connected with overflow pipe 26 on dissolving tank 1, overflow pipe 26 is located same one side of dissolving tank 1 with drain pipe 4, and overflow pipe 26 connects in the position that the lateral wall of dissolving tank 1 is close to the top, the other end and drain pipe 4 intercommunication. A liquid discharge pipe for discharging the urea solution is also arranged on the storage tank 22, and a sewage discharge pipe and an overflow pipe 26 can be correspondingly arranged on the storage tank 22 according to the use requirement.

When the urea solution preparation device is used, the urea solution preparation process is the same as that in the first embodiment, the prepared urea solution flows into the right side of the partition plate 5 from the left side of the partition plate 5 in the dissolving tank 1, then flows into the storage tank 22 from the liquid outlet pipe 4, and the heating pipe in the storage tank 22 heats and keeps the urea solution to keep the dissolving state of the urea solution. After the urea solution level in the storage tank 22 reaches a high value, the feeding and dosing are stopped.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A steam injection formula urea dissolving device, includes dissolving tank (1), its characterized in that: an ejector (2) for feeding is connected to the dissolving tank (1), one end, far away from the dissolving tank (1), of the ejector (2) is connected with a quantitative steam feeding assembly, and two sides of the ejector (2) are respectively connected with a urea quantitative feeding assembly and a quantitative water replenishing assembly; exit fixedly connected with hybrid tube (3) of sprayer (2), the one end that sprayer (2) were kept away from in hybrid tube (3) stretches into the inside of dissolving tank (1), fixedly connected with drain pipe (4) on the lateral wall of dissolving tank (1).

2. The steam injection type urea dissolving device according to claim 1, wherein: fixedly connected with baffle (5) in dissolving tank (1), the extending direction of baffle (5) is unanimous with mixing tube (3), baffle (5) are located between mixing tube (3) and drain pipe (4).

3. The steam injection type urea dissolving device according to claim 1, wherein: a plurality of baffles (6) which are staggered with each other are fixedly connected in the mixing pipe (3) along the extension direction of the mixing pipe (3).

4. The steam injection type urea dissolving device according to claim 1, wherein: urea ration feeding subassembly includes feeder hopper (7), outlet side fixedly connected with rotary feeder (8) of feeder hopper (7), one side fixedly connected with powder conveyer pipe (9) of feeder hopper (7) are kept away from in rotary feeder (8), the one end that rotary feeder (8) were kept away from in powder conveyer pipe (9) is connected with sprayer (2), fixedly connected with air supply (27) of supply air on powder conveyer pipe (9), fixedly connected with powder flowmeter (10) on powder conveyer pipe (9).

5. The steam injection type urea dissolving device according to claim 1, wherein: the quantitative steam inlet assembly comprises a steam tank (11) and a steam pipe (12), the steam pipe (12) is connected between the steam tank (11) and the ejector (2), and a steam flow meter (13), a steam regulating valve (14) and a steam shutoff valve (15) are fixedly connected to the steam pipe (12).

6. The steam injection type urea dissolving device according to claim 5, wherein: the steam pipe (12) is also fixedly connected with a pressure detection device (16).

7. The steam injection type urea dissolving device according to claim 1, wherein: the ration moisturizing subassembly includes moisturizing case (17) and moisturizing pipe (18), moisturizing pipe (18) are connected between moisturizing case (17) and sprayer (2), fixedly connected with moisturizing flowmeter (19), moisturizing governing valve (20) and moisturizing shutoff valve (21) on moisturizing pipe (18).

8. A steam injection formula urea dissolves storage system which characterized in that: the urea dissolving device according to any one of claims 1-7, further comprising a storage tank (22), wherein the liquid outlet pipe (4) is communicated with the storage tank (22), and a heating element (23) is fixedly connected in the storage tank (22).

9. The steam-injected urea solution storage system of claim 8, wherein: the side wall of the dissolving tank (1) and the side wall of the storage tank (22) are respectively fixedly connected with a temperature measuring device (24) and a liquid level measuring device (25), and the side wall of the dissolving tank (1) is also fixedly connected with a density measuring device (28).

10. The steam-injected urea solution storage system of claim 8, wherein: the horizontal position of holding vessel (22) is higher than dissolving tank (1), fixedly connected with overflow pipe (26) on dissolving tank (1), overflow pipe (26) and drain pipe (4) are located the same one side of dissolving tank (1), overflow pipe (26) and drain pipe (4) intercommunication.