CN111467939A - Urea dissolving device and dissolving and storing integrated system - Google Patents

Abstract

The invention discloses a urea dissolving device and a dissolving and storing integrated system, and belongs to the technical field of flue gas denitration reducing agent systems. Urea dissolving device includes the dissolving tank, fixedly connected with division board in the dissolving tank, fixedly connected with mixing chamber in the dissolving tank, mixing chamber towards one side fixedly connected with of gas layer wall and inlet pipe, inlet pipe towards the outer one end fixedly connected with urea ration feeding subassembly of dissolving tank and ration subassembly of intaking. The one end fixedly connected with that the inlet pipe was kept away from to the mixing chamber dissolves the return bend, dissolves the return bend and keeps away from the one end fixedly connected with ejection of compact room of mixing chamber, fixedly connected with breather pipe and discharging pipe on the ejection of compact room. The urea dissolving and storing integrated system also comprises a storage tank, wherein a heating temperature compensating pipe is fixedly connected in the storage tank, and one end of the discharge pipe, which is far away from the discharge chamber, is communicated with the storage tank. The invention has the advantages of short preparation time, high efficiency, small equipment volume and low cost, and is beneficial to reducing the equipment investment and operation cost.

Description

Urea dissolving device and dissolving and storing integrated system

Technical Field

The invention relates to a urea dissolving device and a dissolving and storing integrated system, and belongs to the technical field of flue gas denitration reducing agent systems.

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 ammonia used in the system is usually obtained by hydrolysis/pyrolysis of urea, and the urea solution used in the hydrolysis/pyrolysis process of urea is usually prepared from dry urea and water under the action of certain heat. The traditional dosing method of urea solution mainly comprises the following steps:

the method comprises the following steps: adding desalted water into the dissolving tank to a target water level, and heating the desalted water, wherein the time for adding water and heating is about 1-2 hours;

step two: lifting dry urea by using a bucket lifter, pouring the dry urea into a dissolving tank, starting a stirrer and a dissolving pump, realizing self circulation of the solution in the tank through a self-circulation channel and a circulation pipe of the dissolving pump, stopping feeding when a densimeter on the circulation pipe shows that the target density is reached, and consuming about 1-2 hours in the feeding and circulating stirring processes;

step three: and switching a channel behind the dissolving pump to the storage tank, and conveying the urea solution into the storage tank, wherein the conveying process takes about 1-2 hours.

Because the period of the above ingredients is long, the volume design of the dissolving tank is also large, the urea solution is usually designed according to the demand of 24h, and meanwhile, a stirrer speed reducer, a circulation and conveying pipeline and a corresponding circulating pump corresponding to the dissolving tank need to be matched, and a corresponding concrete foundation is constructed, so that the system is complicated, the transportation and installation are inconvenient, the arrangement of equipment is limited, and the occupied area investment and operation cost of the equipment is high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a urea dissolving device and a dissolving and storing integrated system.

The purpose of the invention is realized by the following technical scheme: the utility model provides a urea dissolving device, includes the dissolving tank, fixedly connected with division board in the dissolving tank, the division board divide into mutually independent gas layer and water bath layer with the dissolving tank, the gas outlet has been seted up on the gas layer, water bath in situ fixedly connected with heating pipe, fixedly connected with inlet tube and outlet pipe on the lateral wall on water bath layer. The dissolving tank is internally and fixedly connected with a mixing chamber, the partition plate is provided with an opening matched with the periphery of the mixing chamber, one side of the mixing chamber facing the gas layer is fixedly connected with a ventilation wall, the ventilation wall is provided with a through hole for gas discharge, and the ventilation wall is positioned in the gas layer. Fixedly connected with inlet pipe in the dissolving tank, the inlet pipe runs through the gas layer, the one end of inlet pipe and the outer intercommunication of dissolving tank, the other end and mixing chamber intercommunication, the inlet pipe is towards the outer one end fixedly connected with urea ration feeding subassembly of dissolving tank and ration subassembly of intaking. The one end fixedly connected with that the inlet pipe was kept away from to the mixing chamber dissolves the return bend, the one end fixedly connected with ejection of compact room that the mixing chamber was kept away from to dissolving the return bend, fixedly connected with breather pipe and discharging pipe on the ejection of compact room, the one end and the gas layer intercommunication of ejection of compact room are kept away from to the breather pipe, the one end and the dissolving tank intercommunication outside the ejection of compact room are kept away from to the discharging pipe.

Through set up mutual independence, each other not communicating gas layer and water bath layer in dissolving the jar for mix urea and water, the mixing chamber of dissolving, dissolve the return bend and all be located the water bath in situ, be used for the exhaust gas breather wall then to be located the gas layer. During feeding, solid materials are conveyed to the feeding pipe through pneumatic conveying by the urea quantitative feeding assembly, water or steam is conveyed to the feeding pipe through the quantitative water inlet assembly, the water or the steam adopted by the feeding pipe has higher temperature, the urea and the water are rapidly contacted and dissolved in the mixing chamber and then enter the dissolving elbow, a small amount of undissolved urea particles are dissolved under the water bath heating action at the periphery of the dissolving elbow, urea solution with certain concentration is formed and enters the discharging chamber, and the urea solution leaves the dissolving tank through the discharging pipe and flows to the next unit. The gas used for conveying the urea enters the gas layer from the ventilating wall, and a small amount of gas or water vapor existing in the dissolved urea solution can enter the gas layer from the ventilating pipe on the discharging chamber and then leave the dissolving tank from the gas outlet on the gas layer. Reduce traditional bulky dissolving container into the interior tube side of constituteing by inlet pipe, mixing chamber, dissolution return bend, discharge chamber and discharging pipe like this, be favorable to the volume of economic equipment, set up the auxiliary facilities on gas layer and water bath layer at its periphery, promote the dissolving of urea granule, saved equipment such as corresponding agitator speed reducer, be favorable to simplifying equipment structure. The dissolving tank is only provided with a feeding pipe, a mixing chamber, a dissolving bent pipe, a discharging chamber and a discharging pipe which are in direct contact with the urea and the urea solution, a gas layer and a water bath layer of the dissolving tank are not in direct contact with the urea and the urea solution, and the dissolving tank can be made of materials with lower grades, so that the equipment cost is reduced.

Further, an exhaust fan is fixedly connected to an air outlet of the gas layer. And the exhaust fan is used for extracting the gas in the gas layer, so that the discharge of the gas in the gas layer is accelerated.

Furthermore, the lateral wall fixedly connected with temperature-detecting device and liquid level detection device on water bath layer the lateral wall of water bath layer is close to the position fixedly connected with overflow pipe and blast pipe on gas layer. Utilize temperature-detecting device and liquid level detection device to monitor the intraformational temperature of water bath and liquid level to the staff control heating pipe adjusts the temperature on water bath, controls the water level of inlet tube adjustment water bath, when the intraformational water level of water bath highly surpassed the mouth of pipe of overflow pipe, the intraformational water of water bath directly is discharged by the overflow pipe.

Furthermore, the upper edge of the mixing chamber is flush with the partition plate, the lower edge of the ventilation wall is fixedly connected with the upper edge of the mixing chamber, the lower edge of the ventilation wall is higher than the lower edge of the feeding pipe, and a water flushing pipe is fixedly connected in the gas layer. The lower end of the feeding pipe is lower than the lower edge of the ventilating wall, so that urea particles entering the mixing chamber from the feeding pipe are separated from air under the action of gravity, the air upwards enters the air layer from the through holes in the ventilating wall, and the urea particles are mixed and dissolved with water or steam in the falling process. When the liquid is accumulated in the gas layer, the accumulated liquid can flow into the mixing chamber through the through hole on the vent wall, or when the gas layer needs to be cleaned, the water flushing pipe is used for flushing the gas layer, and the flushed water also flows into the mixing chamber through the through hole on the vent wall.

Further, urea ration feeding subassembly includes the hopper, the outlet side fixedly connected with rotary feeder of hopper, one side fixedly connected with gas-solid mixer of hopper is kept away from to rotary feeder, fixedly connected with air supply and conveying pipeline on the gas-solid mixer, air supply and conveying pipeline are located the relative both sides of gas-solid mixer, the one end and the inlet pipe intercommunication of gas-solid mixer are kept away from to the conveying pipeline, be provided with on the conveying pipeline and reserve the interface.

Pouring dry urea into the hopper, urea gets into the gas-solid mixer along rotary feeder in, under the prerequisite of guaranteeing that the material is sufficient in the hopper, can make the dry urea that falls into in rotary feeder every hour all be equivalent, again according to rotary feeder's rotational speed, can calculate the weight of the dry urea that the solid feeding subassembly was carried every hour, realize quantitative feeding and transport to dry urea.

Furthermore, the quantitative water inlet assembly comprises a water source and a water delivery pipe, a flowmeter and a regulating valve are fixedly connected to the water delivery pipe, and one end, far away from the water source, of the water delivery pipe is communicated with the feeding pipe. The method comprises the steps of calculating the proportion of water to be fed to urea according to the concentration of a required urea solution, monitoring the feeding amount of water or steam by using a flowmeter according to the conveying amount of the urea, and controlling the feeding amount of the water or the steam by using an adjusting valve so as to realize the feeding of the water or the steam and the urea in the same proportion.

Furthermore, the inlet tube on water bath layer and the water washing pipe on gas layer all with water source fixed connection.

The invention also aims to provide a urea dissolving and storing integrated system which comprises the urea dissolving device and a storage tank, wherein a heating temperature compensating pipe is fixedly connected in the storage tank, one end of the discharge pipe, which is far away from the discharge chamber, is communicated with the storage tank, and a liquid outlet pipe is fixedly connected on the storage tank. The urea solution prepared in the urea dissolving device flows into the storage tank along the discharge pipe, and the urea solution is heated and insulated by the heating temperature compensation pipe, so that the dissolving state of the urea solution is kept, and the urea solution is convenient to take at any time.

Further, the lateral wall fixedly connected with temperature measuring device, level measurement device and the density measurement device of holding vessel, the position fixedly connected with overflow pipe that the lateral wall of holding vessel is close to the top, go out the bottom fixedly connected with blow off pipe of fluid reservoir. Utilize temperature measuring device, liquid level measurement device and density measurement device to carry out real-time supervision to the urea solution in the holding vessel, the temperature of in time control heating temperature compensation pipe in to the holding vessel is adjusted, when the urea solution in the holding vessel reaches higher liquid level, stops urea dissolving device's operation, no longer continues to prepare urea solution.

Further, the level of the storage tank is lower than that of the dissolving tank, and the dissolving tank is positioned at the top of the storage tank. Therefore, the prepared urea solution in the dissolving tank automatically flows into the storage tank under the action of gravity, and equipment such as a conveying pump for conveying the urea solution is omitted.

The invention has the beneficial effects that:

1) through to carrying urea and water or steam in the admission pipe in step, urea and water or steam mix, dissolve in mixing chamber and dissolution elbow, then flow out from the discharging pipe of ejection of compact room, accomplish the preparation to the urea solution, change several processes among the traditional batching method into going on in step, shortened the consuming time of preparation process greatly, be favorable to improving batching efficiency.

2) Reduce traditional, bulky dissolving container for mixing chamber, dissolution return bend and ejection of compact room, reduced the equipment volume greatly, the gas layer and the water bath layer of periphery dissolve the setting for supplementary, hardly with urea direct contact, but its material selective grade lower material relatively is favorable to reducing equipment cost.

3) The dissolving tank provided by the invention does not need to be provided with stirrer speed reducer equipment, a civil engineering concrete foundation part is omitted, the dissolving device is small and exquisite and light, and can be integrally skid-mounted with the storage tank, so that the structure of a dissolving storage system and a pipe network instrument system are further simplified, and the equipment investment and operation cost is saved.

Drawings

Fig. 1 is a schematic internal structure diagram according to a first embodiment of the present invention.

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

Fig. 3 is an external structural diagram of a second embodiment of the present invention.

In the figure, 1, a dissolving tank; 11. a partition plate; 12. a gas layer; 121. an air outlet; 122. an exhaust fan; 123. a water flush pipe; 13. a water bath layer; 131. heating a tube; 132. a water inlet pipe; 133. a water outlet pipe; 134. a temperature detection device; 135. a liquid level detection device; 136. an overflow pipe; 137. an exhaust pipe; 14. a mixing chamber; 15. a vent wall; 16. a feed pipe; 17. dissolving the bent pipe; 18. a discharge chamber; 181. a breather pipe; 182. a discharge pipe; 2. a hopper; 21. a rotary feeder; 22. a gas-solid mixer; 23. a gas source; 24. a delivery pipe; 3. a water source; 31. a water delivery pipe; 32. a flow meter; 33. adjusting a valve; 4. a storage tank; 41. heating the temperature compensating pipe; 42. a liquid outlet pipe; 43. a temperature measuring device; 44. a liquid level measuring device; 45. a density measuring device; 46. a liquid overflow pipe; 47. a sewage discharge pipe.

Detailed Description

The technical solutions 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. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Example one

As shown in fig. 1 and 3, the present embodiment provides a urea dissolving apparatus, which includes a dissolving tank 1, a partition plate 11 extending in a horizontal direction is fixedly connected to the inside of the dissolving tank 1, the partition plate 11 divides the dissolving tank 1 into a gas layer 12 and a water bath layer 13 which are independent from each other, the gas layer 12 is located above the partition plate 11, and the water bath layer 13 is located below the partition plate 11. An air outlet 121 is formed in the gas layer 12, the air outlet 121 is located at the top of the dissolving tank 1, an exhaust fan 122 is fixedly connected to the air outlet 121, and the exhaust fan 122 timely extracts the gas in the gas layer 12 from the air outlet 121. The heating pipe 131 is fixedly connected in the water bath layer 13, the heating pipe 131 may be electrically heated, or the steam may be introduced into the pipe for heating, as long as the heating of water can be realized, and the heating pipe 131 adopted in this embodiment is electrically heated. A water inlet pipe 132 and a water outlet pipe 133 are fixedly connected to the side wall of the water bath layer 13, and before the urea solution is prepared, water is added into the water bath layer 13 through the water inlet pipe 132, and the water in the water bath layer 13 is heated by the heating pipe 131. Still fixedly connected with temperature-detecting device 134 and liquid level detection device 135 at the lateral wall of water bath layer 13, make things convenient for the staff to carry out real time monitoring to the temperature and the water level height in the water bath layer 13, be convenient for in time adjust opening and close or the moisturizing of heating pipe 131, be close to the position fixedly connected with overflow pipe 136 and the blast pipe 137 of gas layer 12 at the lateral wall of water bath layer 13, when the water level in water bath layer 13 was too high, can follow overflow pipe 136 outflow water bath layer 13, the gas that produces then discharges from blast pipe 137 in the water bath layer 13, avoid water bath layer 13 middling pressure too big.

As shown in fig. 1, a mixing chamber 14 is fixedly connected in the dissolving tank 1, an opening matched with the periphery of the mixing chamber 14 is formed on the partition plate 11, the upper end of the mixing chamber 14 is fixedly connected at the opening, a vent wall 15 is fixedly connected above the mixing chamber 14, the vent wall 15 is positioned in the gas layer 12, a through hole for discharging gas is formed in the vent wall 15, a water flushing pipe 123 is also fixedly connected in the gas layer 12, accumulated liquid or flushing water in the gas layer 12 can flow into the mixing chamber 14 along the through hole, and a water inlet pipe 132 of the water bath layer 13 and the water flushing pipe 123 of the gas layer 12 are both fixedly connected with a water source 3. Still fixedly connected with inlet pipe 16 in the dissolving tank 1, the upper end of inlet pipe 16 communicates with dissolving tank 1 is outer, and the lower extreme stretches into in the mixing chamber 14, and the horizontal height of the lower extreme of inlet pipe 16 is less than the lower limb of ventilating wall 15, realizes separating between the material of convenient air conveying and the gas of carrying, reduces the material and leaves from gas outlet 121 department of gas layer 12 along with gas.

The upper end of the feeding pipe 16 is fixedly connected with a urea quantitative feeding assembly and a quantitative water inlet assembly, a pressure measuring device can be installed on the feeding pipe 16, the urea quantitative feeding assembly is used for conveying dry urea to the feeding pipe 16 in a fixed amount, and the quantitative water inlet assembly is used for conveying water or steam to the feeding pipe 16 in a fixed amount. The urea ration subassembly of this embodiment includes hopper 2, the below fixedly connected with rotary feeder 21 of hopper 2, rotary feeder 21's below fixedly connected with gas-solid mixer 22, fixedly connected with air supply 23 and conveying pipeline 24 on the gas-solid mixer 22, air supply 23 here can be air compressor machine or air-blower, the air compressor machine is adopted to this embodiment, material in the hopper 2 falls into behind gas-solid mixer 22 through rotary feeder 21, the compressed air who comes from air supply 23 gets into in the gas-solid mixer 22 and mixes with the material, the compressed air after the mixture takes the material to get into in the inlet pipe 16 along conveying pipeline 24. The delivery pipe 24 is 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, the unloading pipe of the transport vehicle can be directly connected with the reserved interface, the dry urea is directly loaded by the transport tank truck, unpacked pure urea particles loaded and transported in the transport tank truck enter the feeding pipe 16 along the delivery pipe 24 to prepare urea solution, and the operation is convenient and labor-saving. The material falls into the mixing chamber 14 along the feed pipe 16 under the action of gravity, and the air for conveying the material upwards enters the gas layer 12 through the ventilation wall 15 and leaves from the air outlet 121 under the action of the exhaust fan 122, so that gas-solid separation is realized. The quantitative water inlet assembly of the embodiment comprises a water source 3 and a water delivery pipe 31, wherein the water delivery pipe 31 is fixedly connected with a flow meter 32 and a regulating valve 33, and the right end of the water delivery pipe 31 is communicated with a material delivery pipe 24.

As shown in fig. 1, the lower end of the mixing chamber 14 is fixedly connected with a dissolution elbow 17, the other end of the dissolution elbow 17 is connected with a discharge chamber 18, that is, the dissolution elbow 17 is connected between the mixing chamber 14 and the discharge chamber 18, urea and water or steam are primarily mixed and dissolved in the mixing chamber 14 and then flow into the dissolution elbow 17, and under the water bath heating action of the periphery of the dissolution elbow 17, undissolved urea particles are dissolved in water to form a urea solution. A vent pipe 181 and a discharge pipe 182 are fixedly connected to the discharge chamber 18, and a temperature sensor can be connected to the discharge pipe 182, so that the temperature of the discharged liquid can be monitored conveniently. The vent pipe 181 is located above the discharge chamber 18 and communicates with the gas layer 12, so that the gas contained in the urea solution enters the gas layer 12 through the vent pipe 181 and is discharged along the gas outlet 121. The prepared urea solution flows out of the discharge pipe 182 and flows to the next unit outside the dissolving tank 1.

When the device is used, water is firstly added into the water bath layer 13 and heated, after the water temperature in the water bath layer 13 rises to 60 ℃, the material is fed into the hopper 2, enters the gas-solid mixer 22 through the rotary feeder 21 and is fed into the feeding pipe 16 by compressed air from the air source 23 along the feeding pipe 24. Under the condition that the materials in the hopper 2 are sufficient, the materials conveyed by the rotary feeder 21 in each rotation are equal, the material feeding amount of the materials is calculated by combining the rotating speed of the rotary feeder 21, and then the regulating valve 33 on the water conveying pipe 31 is controlled according to the concentration of the required urea solution, so that the water and the materials are synchronously conveyed into the feeding pipe 16 in proportion. The urea falls into the mixing chamber 14 under the action of gravity, and is mixed and dissolved with the higher-temperature hydrophobic water (about 120 ℃) delivered from the water delivery pipe 31, the hydrophobic water is used as a water source and a heat source, the urea is rapidly dissolved at the moment of contact with urea particles, air for delivering the urea upwards enters the gas layer 12 from the ventilation wall 15, and is extracted from the air outlet 121 under the action of the exhaust fan 122. The urea solution which is initially dissolved enters the dissolution elbow 17, a small amount of undissolved urea particles are slowly dissolved under the heating action of water bath, and the formed urea solution with the required concentration enters the discharging chamber 18 and flows to the next unit along the discharging pipe 182.

Example two

As shown in fig. 2 and fig. 3, this embodiment provides a urea dissolving and storing integrated system, including the urea dissolving device of embodiment one, still include holding vessel 4, holding vessel 4 is located the below of dissolving tank 1, communicates with ejection of compact room 18 through discharging pipe 182, and discharging pipe 182 is connected between ejection of compact room 18 and holding vessel 4 promptly, and the urea solution prepared in dissolving tank 1 flows into holding vessel 4 by gravity in, need not extra transmission equipment. A heating/temperature-compensating pipe 41 is fixedly connected to the inside of the storage tank 4, and heats the urea solution in the storage tank 4 to maintain the urea solution in a dissolved state. A liquid outlet pipe 42 is fixedly connected to the storage tank 4, and the urea solution in the liquid storage tank flows to the next unit through the liquid outlet pipe 42. Still fixedly connected with temperature measuring device 43, level measurement device 44 and density measurement device 45 on the lateral wall of holding vessel 4, the temperature, liquid level and the concentration of urea solution in the real-time supervision holding vessel 4 of being convenient for to in time control heats the temperature-compensated pipe 41 and adjusts the temperature of urea solution. When the urea solution in the storage tank 4 reaches a high liquid level, the operation of the urea dissolving device is stopped, and the urea solution in the storage tank 4 is prevented from overflowing. Simultaneously, be close to the position fixedly connected with overflow pipe 46 at the lateral wall of holding vessel 4 top, can follow overflow pipe 46 when the urea solution in holding vessel 4 is too much and flow out, at the bottom of holding vessel 4 still fixedly connected with blow off pipe 47, overflow pipe 46 can with blow off pipe 47 intercommunication, the upper end and the holding vessel 4 intercommunication of overflow pipe 46 promptly, lower extreme and blow off pipe 47 intercommunication.

When the device is used, normal-temperature desalted water is added into the water bath layer 13 and heated, after the water temperature in the water bath layer 13 rises to 80 ℃, the water begins to be fed into the hopper 2, and the material enters the gas-solid mixer 22 through the rotary feeder 21 and is fed into the feeding pipe 16 through the feeding pipe 24 by compressed air from the air source 23. Under the condition that the materials in the hopper 2 are sufficient, the materials conveyed by the rotary feeder 21 in each rotation are equal, the feeding amount of the materials is calculated by combining the rotating speed of the rotary feeder 21, and then the regulating valve 33 on the water conveying pipe 31 is controlled according to the concentration of the required urea solution, so that the steam and the materials are synchronously conveyed into the feeding pipe 16 in proportion. The urea falls into the mixing chamber 14 under the action of gravity, and is mixed and dissolved with low-pressure steam (about 0.1MPa, 120 ℃) sent from the water pipe 31, the steam is used as a water source and a heat source, the urea is rapidly dissolved at the moment of contact with urea particles, and air for conveying the urea upwards enters the gas layer 12 from the ventilating wall 15. In the urea solution of preliminary dissolution gets into dissolving return bend 17, under the water bath heating effect, a small amount of urea granule that does not dissolve also slowly dissolves, form the urea solution of required concentration and get into ejection of compact room 18 in, flow to storage tank 4 along discharging pipe 182 in, utilize temperature measuring device 43 to monitor the temperature of urea solution in the storage tank 4, in time control heating temperature compensation pipe 41 heats urea solution, after the liquid level reaches the high value in the storage tank, urea dissolving device stop operation.

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A urea dissolving device is characterized in that: the gas-water separation device comprises a dissolving tank (1), wherein a partition plate (11) is fixedly connected in the dissolving tank (1), the dissolving tank (1) is divided into a gas layer (12) and a water bath layer (13) which are mutually independent by the partition plate (11), a gas outlet (121) is formed in the gas layer (12), a heating pipe (131) is fixedly connected in the water bath layer (13), and a water inlet pipe (132) and a water outlet pipe (133) are fixedly connected on the side wall of the water bath layer (13); a mixing chamber (14) is fixedly connected in the dissolving tank (1), an opening matched with the periphery of the mixing chamber (14) is formed in the partition plate (11), a vent wall (15) is fixedly connected to one side, facing the gas layer (12), of the mixing chamber (14), a through hole for gas to be discharged is formed in the vent wall (15), and the vent wall (15) is located in the gas layer (12); a feeding pipe (16) is fixedly connected in the dissolving tank (1), the feeding pipe (16) penetrates through the gas layer (12), one end of the feeding pipe (16) is communicated with the outside of the dissolving tank (1), the other end of the feeding pipe is communicated with the mixing chamber (14), and one end of the feeding pipe (16) facing the outside of the dissolving tank (1) is fixedly connected with a urea quantitative feeding assembly and a quantitative water inlet assembly; one end fixedly connected with that inlet pipe (16) were kept away from in mixing chamber (14) dissolves return bend (17), dissolve return bend (17) and keep away from one end fixedly connected with discharge chamber (18) of mixing chamber (14), fixedly connected with breather pipe (181) and discharging pipe (182) on discharge chamber (18), the one end and gas layer (12) intercommunication of discharge chamber (18) are kept away from in breather pipe (181), the one end and the dissolving tank (1) outer intercommunication of discharge chamber (18) are kept away from in discharging pipe (182).

2. A urea dissolving apparatus as defined in claim 1, further comprising: an exhaust fan (122) is fixedly connected to the air outlet (121) of the air layer (12).

3. A urea dissolving apparatus as defined in claim 1, further comprising: the side wall of the water bath layer (13) is fixedly connected with a temperature detection device (134) and a liquid level detection device (135), and the side wall of the water bath layer (13) close to the gas layer (12) is fixedly connected with an overflow pipe (136) and an exhaust pipe (137).

4. A urea dissolving apparatus as defined in claim 1, further comprising: the upper edge of the mixing chamber (14) is flush with the partition plate (11), the lower edge of the vent wall (15) is fixedly connected with the upper edge of the mixing chamber (14), the lower edge of the vent wall (15) is higher than the lower edge of the feeding pipe (16), and a water flushing pipe (123) is fixedly connected in the gas layer (12).

5. A urea dissolving apparatus as defined in claim 1, further comprising: urea ration feeding subassembly includes hopper (2), outlet side fixedly connected with rotary feeder (21) of hopper (2), one side fixedly connected with gas-solid blender (22) of hopper (2) are kept away from in rotary feeder (21), fixedly connected with air supply (23) and conveying pipeline (24) are gone up in gas-solid blender (22), air supply (23) and conveying pipeline (24) are located the relative both sides of gas-solid blender (22), the one end and inlet pipe (16) intercommunication of gas-solid blender (22) are kept away from in conveying pipeline (24), be provided with on conveying pipeline (24) and reserve the interface.

6. A urea dissolving device according to claim 4, characterized in that: the quantitative water inlet assembly comprises a water source (3) and a water conveying pipe (31), a flowmeter (32) and a regulating valve (33) are fixedly connected to the water conveying pipe (31), and one end, far away from the water source (3), of the water conveying pipe (31) is communicated with the feeding pipe (16).

7. A urea dissolving device according to claim 6, characterized in that: the water inlet pipe (132) of the water bath layer (13) and the water washing pipe (123) of the gas layer (12) are fixedly connected with the water source (3).

8. The utility model provides a urea dissolves stores integrated system which characterized in that: the urea dissolving device comprises the urea dissolving device according to any one of claims 1 to 7, and further comprises a storage tank (4), wherein a heating and temperature compensating pipe (41) is fixedly connected in the storage tank (4), one end of the discharge pipe (182) far away from the discharge chamber (18) is communicated with the storage tank (4), and a liquid outlet pipe (42) is fixedly connected on the storage tank (4).

9. The integrated urea dissolving and storing system according to claim 8, wherein: the lateral wall fixedly connected with temperature measuring device (43), liquid level measurement device (44) and density measurement device (45) of holding vessel (4), the lateral wall of holding vessel (4) is close to the position fixedly connected with overflow pipe (46) at top, go out bottom fixedly connected with blow off pipe (47) of fluid reservoir.

10. The integrated urea dissolving and storing system according to claim 8, wherein: the horizontal height of the storage tank (4) is lower than that of the dissolving tank (1), and the dissolving tank (1) is positioned at the top of the storage tank (4).

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