Partitioned temperature control urea dissolving and storing integrated device

Abstract

The utility model discloses a urea dissolving and storing integrated device with partition temperature control, which belongs to the technical field of flue gas denitration reducing agent preparation and comprises a urea integration box, a baffle is arranged in the urea integration box and divides the urea integration box into a dissolving cavity and a storage cavity, and the urea integration box is provided with a conveying pipe; the urea integration box is provided with a discharging opening, and the storage cavity communicates with a circulating pipe. The heating assembly is arranged in the urea integration box; and the two temperature control modules are both arranged on the urea integration box. The baffle is arranged to divide the interior of the urea integration box into the independent dissolving cavity and the independent storage cavity, and the heating assemblies are arranged in the dissolving cavity and the storage cavity, so that the technical problems that due to the fact that the heating components are long, the temperature of a urea solution during storage is insufficient, and the high-concentration urea solution is crystallized are solved; the technical effect of preventing urea solution crystallization from blocking the pipeline is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration reducing agent preparation, in particular to a zoned temperature-controlled urea dissolving and storing integrated device. Background Art

[0002] In the flue gas denitrification system, the selective catalytic reduction technology (SCR) is the most commonly used method. This technology uses ammonia as a reducing agent to convert nitrogen oxides into nitrogen and water under the action of a catalyst. The reducing agent ammonia can be prepared by various methods such as liquid ammonia evaporation, ammonia water evaporation or urea hydrolysis. Liquid ammonia and ammonia water are classified as hazardous chemicals due to their flammable and explosive properties, so they need to be strictly managed during transportation and storage. In comparison, urea has a relatively stable and non-toxic chemical property and is more suitable for transportation and storage. During the use of urea, the urea solution is heated and hydrolyzed to generate ammonia for flue gas denitrification treatment.

[0003] However, the existing urea dissolution and storage integrated device has a long heating element, which results in insufficient temperature of the urea solution during storage, causing the high-concentration urea solution to crystallize, which in turn blocks the pipeline and reduces the stability and efficiency of the entire urea hydrolysis system. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a zoned temperature-controlled urea dissolution and storage integrated device, comprising:

[0005] A urea integrated box, wherein a baffle is arranged inside the urea integrated box, and the baffle divides the internal cavity of the urea integrated box into a dissolving chamber and a storage chamber, wherein the dissolving chamber is used to put urea granules for dissolution, and the storage chamber is used to store the dissolved urea solution, and the urea integrated box is also provided with a delivery pipe, and the dissolving chamber and the storage chamber are connected through the delivery pipe;

[0006] The top of the urea integrated box is provided with a feed port, and the feed port is connected with the dissolution chamber, the feed port is used to put urea granules, the storage chamber is connected with a circulation pipe, the circulation pipe is used to transport the urea solution to the urea hydrolyzer, and a delivery pump is also provided on the circulation pipe;

[0007] A heating component, which is arranged in the urea integrated box and is used for allowing external high-temperature steam to enter the interior to heat the urea solution in the urea integrated box;

[0008] Wherein, the heating assembly includes two heating pipelines, which are respectively arranged in the dissolving chamber and the storage chamber, and the heating pipelines are coil-type structures so as to fully heat the urea solution;

[0009] Two temperature control modules are provided on the urea integrated box and are respectively adapted to the dissolution chamber and the storage chamber. Both temperature control modules are electrically connected to the heating component so that the heating component can be adjusted according to the temperature in the urea integrated box.

[0010] Optionally, the urea integrated box also includes:

[0011] A condensate drain pipe, one end of which is connected to the dissolution chamber, and the other end of which is connected to an external drain pump;

[0012] A desalted water pipe, one end of which is connected to the dissolution chamber, and the other end of which is connected to an external plant area.

[0013] Optionally, the heating component further comprises:

[0014] A steam delivery pipe, the steam outlet end of which is respectively connected to the two heating pipelines, so that the plant steam passes through the steam delivery pipe and enters the delivery pipe for heating;

[0015] A steam desuperheater is arranged on the steam delivery pipe and is used to reduce the temperature of steam from the plant area.

[0016] Two adjustable valves, the two adjustable valves are respectively arranged on the steam delivery pipe at the inlets of the two heating pipelines, and the two adjustable valves are respectively connected to the two temperature control modules by telecommunication;

[0017] A drain pipe is connected to the two heating pipelines respectively, so that the steam in the two heating pipelines flows out into the drain tank through the drain pipe after cooling.

[0018] Optionally, the temperature control module includes:

[0019] A thermometer, which is arranged outside the urea integrated box and is respectively adapted to the dissolution chamber and the storage chamber, and is used to measure the temperature in the dissolution chamber and the storage chamber;

[0020] A temperature sensor is disposed outside the urea integrated box and is electrically connected to an external controller.

[0021] Optionally, the urea integrated tank is further provided with two overflow pipes, and the two overflow pipes are respectively adapted to the dissolution chamber and the storage chamber.

[0022] Optionally, an agitator is further provided in the dissolution chamber of the urea integrated box.

[0023] Optionally, a density meter is also provided in the dissolution chamber.

[0024] Optionally, two liquid level gauges are further provided on the urea integrated tank, and the two liquid level gauges are respectively adapted to the dissolution chamber and the storage chamber to detect the liquid level heights in the two chambers.

[0025] Optionally, a dissolution pump is further provided on the delivery pipe, and the dissolution pump is used to dissolve the urea in the dissolution chamber and extract it into the storage chamber.

[0026] Optionally, two exhaust fans are further provided on the urea integrated box, and the two exhaust fans are respectively adapted to the dissolution chamber and the storage chamber.

[0027] By adopting the above technical solution, the utility model mainly has the following technical effects:

[0028] By setting a baffle to divide the interior of the urea integrated box into a separate dissolution chamber and a storage chamber, and providing heating components in both the dissolution chamber and the storage chamber, the technical problem of insufficient temperature of the urea solution during storage and crystallization of the high-concentration urea solution due to the long length of the heating component is solved, and the technical effect of preventing the crystallization of the urea solution from clogging the pipeline is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a zoned temperature-controlled urea dissolution and storage integrated device of the utility model;

[0030] Figure 2 This is a partial structural diagram of a zoned temperature-controlled urea dissolution and storage integrated device of the utility model. Figure 1 ;

[0031] Figure 3 This is a partial structural diagram of a zoned temperature-controlled urea dissolution and storage integrated device of the utility model. Figure 2 .

[0032] The meanings of the reference numerals are as follows:

[0033] 1. Urea integrated box; 11. Baffle; 12. Dissolution chamber; 121. Feeding port; 122. Agitator; 123. Density meter; 13. Storage chamber; 131. Circulation pipe; 1311. Delivery pump; 14. Delivery pipe; 141. Dissolution pump; 15. Condensate drain pipe; 16. Demineralized water pipe; 17. Overflow pipe; 18. Liquid level meter; 19. Exhaust fan;

[0034] 2. Heating assembly; 21. Heating pipeline; 22. Steam delivery pipe; 23. Steam desuperheater; 24. Adjustable valve; 25. Drain pipe;

[0035] 3. Temperature control module; 31. Thermometer; 32. Temperature sensor. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the specification of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] Example:

[0039] See also Figure 1-Figure 3As shown, the utility model provides a zoned temperature-controlled urea dissolving and storing integrated device. In practical application, in order to solve the problem that the temperature of the terminal urea solution is reduced due to the excessive length of the heating component in the urea dissolving and storing integrated device, the device and pipeline are blocked by crystals, and the device comprises a urea integrated box 1, a heating component 2 and two temperature control modules 3. The urea integrated box 1 is a closed container with an internal cavity. A baffle 11 is arranged inside the urea integrated box 1. The baffle 11 divides the internal cavity of the urea integrated box 1 into a dissolving chamber 12 and a storage chamber 13. A delivery pipe 14 is arranged on the urea integrated box 1. The dissolving chamber 12 and the storage chamber 13 are connected through the delivery pipe 14, so that the urea solution dissolved in the dissolving chamber 12 is delivered to the storage chamber 13 for use. Preferably, a dissolving pump 141 is also arranged on the delivery pipe 14. The dissolving pump 141 is used to dissolve and extract the urea in the dissolving chamber 12 into the storage chamber 13. The top of the urea integrated box 1 is provided with a feed port 121 for feeding urea granules, and the feed port 121 is connected with the dissolving chamber 12, the dissolving chamber 12 is used to feed urea granules for dissolution, the storage chamber 13 is used to store the dissolved urea solution, the storage chamber 13 is connected with a circulation pipe 131, and the circulation pipe 131 is used to transport the urea solution to the urea hydrolyzer. Preferably, in order to facilitate the urea solution in the storage chamber 13 to flow into the external urea hydrolyzer more smoothly, a delivery pump 1311 is also provided on the circulation pipe 131. The heating component 2 is arranged in the urea integrated box 1, and the heating component 2 is used for external high-temperature steam to enter and heat the urea integrated box 1; wherein, the heating component 2 includes two heating pipelines 21, and the two heating pipelines 21 are respectively arranged in the dissolution chamber 12 and the storage chamber 13, and the heating pipeline 21 is a coil structure to increase the contact area with the urea solution and fully heat the urea solution. The external high-temperature steam enters the heating pipeline 21, and the temperature of the heating pipeline 21 itself is increased, so that the urea solution in contact with the heating pipeline 21 is heated and the temperature is continuously maintained within a certain range. The two temperature control modules 3 are arranged on the urea integrated box 1, and the temperature control modules 3 are used to monitor the temperature in the urea integrated box 1. The two temperature control modules 3 are respectively adapted to the dissolution chamber 12 and the storage chamber 13, that is, the two temperature control modules 3 are respectively used to monitor the temperature in the dissolution chamber 12 and the storage chamber 13, and the two temperature control modules 3 are both electrically connected to the heating component 2 to realize temperature control of the heating component 2 according to the temperature changes of the dissolution chamber 12 and the storage chamber 13 in the urea integrated box 1, thereby adjusting the temperature of the urea solution in the dissolution chamber 12 and the storage chamber 13.

[0040] Specifically, the urea integrated box 1 further includes a condensate drain pipe 15 and a desalted water pipe 16. One end of the condensate drain pipe 15 is connected to the dissolution chamber 12, and the other end is connected to an external drain pump, so that the drain flows into the dissolution chamber 12 to mix and dissolve with the urea particles. One end of the desalted water pipe 16 is connected to the dissolution chamber 12, and the other end is connected to an external desalted water tank in the plant area. Using desalted water to dissolve urea can improve the quality of the urea solution.

[0041] In this embodiment, the staff puts urea granules into the dissolution chamber 12 through the discharge port 121, and the desalted water enters the dissolution chamber 12 through the desalted water pipe 16. The urea solution mixed and dissolved in the dissolution chamber 12 enters the storage chamber 13 through the delivery pipe 14 for storage. At this time, the heating component 2 works to continuously heat the urea solutions in the dissolution chamber 12 and the storage chamber 13. After the heating is completed, the temperature is continuously maintained within a certain range to prevent the urea from being dissolved in the urea integrated box 1 and causing crystallization due to the temperature drop. When the urea solution is needed, the urea solution in the storage chamber 13 flows to the urea hydrolyzer through the circulation pipe 131.

[0042] In this embodiment, the heating assembly 2 further includes a steam delivery pipe 22, a steam desuperheater 23, two adjustable valves 24 and a drain pipe 25. The steam outlet ends of the steam delivery pipe 22 are respectively connected to the two heating pipelines 21, so that the plant steam enters the heating pipeline 21 through the steam delivery pipe 22, so that the temperature of the heating pipeline 21 increases. The steam desuperheater 23 is arranged on the steam delivery pipe 22, and is used to reduce the temperature of the steam from the plant to prevent the heating pipeline 21 from overheating due to excessive steam temperature. The two adjustable valves 24 are respectively arranged on the steam delivery pipe 22 near the connection with the two heating pipelines 21, and the two adjustable valves 24 are respectively connected to the two temperature control modules 3 by telecommunications, so that the two temperature control modules 3 can respectively control the opening and closing states of the two adjustable valves 24. Among them, one end of the drain pipe 25 is connected to the two heating pipelines 21 respectively, so that after the cooled steam in the heating pipeline 21 is converted into liquid, it can flow out into the drain tank through the drain pipe 25, thereby preventing the steam from cooling in the heating pipeline 21 and not flowing, thereby reducing the heating efficiency.

[0043] In this embodiment, the temperature control module 3 includes a thermometer 31 and a temperature sensor 32. The thermometer 31 is arranged outside the urea integrated box 1 and is respectively adapted to the dissolving chamber 12 and the storage chamber 13. The thermometer 31 is used to measure the temperature in the dissolving chamber 12 and the storage chamber 13 so that the staff can check at any time; the temperature sensor 32 is arranged outside the urea integrated box 1, and the temperature sensor 32 is connected to the controller by telecommunication. For example, when the temperature sensor 32 detects that the temperature in the dissolving chamber 12 or the storage chamber 13 reaches a preset threshold, the temperature sensor 32 sends the collected data to the controller, and then the controller controls the opening and closing degree of the adjustable valve 24 on the steam delivery pipe 22, controls the steam flow rate entering the heating pipeline 21, thereby adjusting the temperature of the heating pipeline 21, and then adjusting the temperature of the urea solution in the dissolving chamber 12 and the storage chamber 13 of the urea integrated box 1, wherein the controller can be a PLC circuit controller.

[0044] Preferably, in order to prevent the temperature in the dissolution chamber 12 and the storage chamber 13 from being too high, two exhaust fans 19 are further provided on the urea integrated box 1 to quickly discharge the heat in the dissolution chamber 12 and the storage chamber 13. For example, the exhaust fan 19 includes an exhaust fan. When the temperature in the dissolution chamber 12 or the storage chamber 13 is too high, the internal hot air can be quickly discharged by starting the exhaust fan.

[0045] In some preferred embodiments, a stirrer 122 is further provided in the dissolution chamber 12, and the stirrer 122 is used to stir the urea granules and desalted water in the dissolution chamber 12 so that the two are evenly mixed; in order to facilitate the detection of whether the urea granules are fully dissolved, a densitometer 123 is also provided on the urea integrated box 1 in the dissolution chamber 12, so that the staff can monitor the density of the urea solution in the dissolution chamber 12 to ensure that the urea granules in the dissolution chamber 12 are fully dissolved.

[0046] In some preferred embodiments, the urea integrated tank 1 is further provided with two liquid level gauges 18, which are respectively adapted to the dissolving chamber 12 and the storage chamber 13, so that the staff can check the liquid level heights in the two chambers in real time. In addition, in order to prevent the urea solution in each chamber from overflowing from the urea integrated tank 1, the urea integrated tank 1 is further provided with two overflow pipes 17, which are respectively adapted to the heights of the dissolving chamber 12 and the storage chamber 13.

[0047] Finally, it should be noted that the embodiments of the present invention disclose only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A zoned temperature-controlled urea dissolution and storage integrated device, characterized in that: include: A urea integrated box (1), wherein a baffle (11) is arranged inside the urea integrated box (1), and the baffle (11) divides the internal cavity of the urea integrated box (1) into a dissolving chamber (12) and a storage chamber (13), wherein the dissolving chamber (12) is used to input urea granules for dissolution, and the storage chamber (13) is used to store the dissolved urea solution, and the urea integrated box (1) is also provided with a delivery pipe (14), and the dissolving chamber (12) and the storage chamber (13) are connected through the delivery pipe (14); The top of the urea integrated box (1) is provided with a feed port (121), and the feed port (121) is communicated with the dissolving chamber (12), the feed port (121) is used to put urea granules, the storage chamber (13) is communicated with a circulation pipe (131), the circulation pipe (131) is used to transport the urea solution to the urea hydrolyzer, and the circulation pipe (131) is also provided with a delivery pump (1311); A heating component (2), the heating component (2) being arranged in the urea integrated box (1), the heating component (2) being used for allowing external high-temperature steam to enter the interior to heat the urea solution in the urea integrated box (1); The heating assembly (2) comprises two heating pipelines (21), the two heating pipelines (21) are respectively arranged in the dissolving chamber (12) and the storage chamber (13), and the heating pipelines (21) are of a coil structure so as to fully heat the urea solution; Two temperature control modules (3), both of which are arranged on the urea integrated box (1) and are respectively adapted to the dissolution chamber (12) and the storage chamber (13), and both of which are electrically connected to the heating component (2) so that the heating component (2) can be adjusted according to the temperature in the urea integrated box (1).

2. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: The urea integrated box (1) also includes: A condensate drain pipe (15), one end of which is in communication with the dissolution chamber (12) and the other end of which is in communication with an external drain pump; A desalted water pipe (16), one end of which is connected to the dissolution chamber (12) and the other end of which is connected to an external plant area.

3. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: The heating component (2) also includes: A steam delivery pipe (22), wherein the steam outlet end of the steam delivery pipe (22) is respectively connected to the two heating pipelines (21), so that the plant steam passes through the steam delivery pipe and enters the delivery pipe (14) for heating; a steam desuperheater (23), the steam desuperheater (23) being arranged on the steam delivery pipe (22) and being used to reduce the temperature of steam from the plant area; Two adjustable valves (24), the two adjustable valves (24) are respectively arranged on the steam delivery pipe (22) at the inlets of the two heating pipelines (21), and the two adjustable valves (24) are respectively connected to the two temperature control modules (3) by telecommunication; A drain pipe (25) is connected to the two heating pipelines (21) respectively, so that the steam in the two heating pipelines (21) flows out into the drain tank through the drain pipe (25) after cooling.

4. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: The temperature control module (3) comprises: a thermometer (31), the thermometer (31) being arranged outside the urea integrated box (1) and being respectively adapted to the dissolution chamber (12) and the storage chamber (13), the thermometer (31) being used to measure the temperature inside the dissolution chamber (12) and the storage chamber (13); A temperature sensor (32), wherein the temperature sensor (32) is arranged outside the urea integrated tank, and the temperature sensor (32) is electrically connected to an external controller.

5. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: The urea integrated box (1) is also provided with two overflow pipes (17), and the two overflow pipes (17) are respectively adapted to the dissolution chamber (12) and the storage chamber (13).

6. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: A stirrer (122) is also provided in the dissolving chamber (12) of the urea integrated box (1).

7. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: A densitometer (123) is also provided in the dissolving chamber (12).

8. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: The urea integrated tank (1) is also provided with two liquid level gauges (18), which are respectively adapted to the dissolution chamber (12) and the storage chamber (13) to detect the liquid level heights in the two chambers.

9. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: The delivery pipe (14) is also provided with a dissolution pump (141), and the dissolution pump (141) is used to dissolve the urea in the dissolution chamber (12) and extract it into the storage chamber (13).

10. The urea dissolution and storage integrated device with zoned temperature control according to claim 1, characterized in that: The urea integrated box (1) is also provided with two exhaust fans (19), and the two exhaust fans (19) are respectively adapted to the dissolution chamber (12) and the storage chamber (13).

Images