Full-load denitration urea automatic dissolving and storing shared system

Abstract

The utility model relates to a kind of full load denitration urea automatic dissolving storage shared system, belong to denitration technical field.It includes urea automatic feeding system, dissolving water feeding system, dissolving water is automatically fed to urea dissolving tank;Concentrated urea solution transfer system is connected with urea dissolving tank, and concentrated urea solution after dissolving is transferred, and is transferred to concentrated urea solution storage tank;Automatic control system is used to control dissolving water feeding and concentrated urea solution feeding automatic stop, and dissolving water and urea concentrated solution conveying automatic switching.The utility model can solve the problem of low efficiency, heavy workload, low operation safety of boiler denitration urea manual feeding, can also solve the problem of winding and conveying pipeline blockage of dissolving stirrer, related equipment jam, poor operation of denitration system.The utility model can solve the problem of low utilization rate of boiler denitration dissolving water pump and storage pump, high operation and maintenance cost, and large risk problem of misoperation, and can achieve the effect of full load section NOx treatment.

Description

Technical Field

[0001] This utility model belongs to the field of denitrification technology, specifically relating to a full-load denitrification urea automatic dissolution, transfer and storage shared system. Background Technology

[0002] Currently, the mainstream technologies for controlling ultra-low nitrogen oxide emissions are selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR). There are three types of reducing agents in denitrification systems: liquid ammonia, ammonia water, and urea. Liquid ammonia and urea are the most commonly used. Liquid ammonia is a toxic and hazardous chemical, while urea, as a non-hazardous ammonia production feedstock, has the same denitrification performance as liquid ammonia and is completely free of hazards and regulatory restrictions, allowing for convenient transportation, storage, and use. Currently, urea is the primary denitrification reducing agent in China.

[0003] Currently, domestic denitrification reducing agent urea is all bagged urea. Dissolving urea requires manual unpacking of the bag and manual pouring into the feeding equipment. The entire process involves a huge amount of manual labor and is highly dangerous. During feeding, debris such as the unpacking line and the certificate of conformity for bagged urea are often mixed into the material and brought into the dissolving tank, entangled in the dissolving agitator and blocked in the subsequent conveying pipeline, jammed related equipment, and caused the denitrification system to malfunction.

[0004] In the preparation of the denitrification reducing agent, the dissolving water tank needs to be filled with water first. After filling, the dissolving water is transferred to the urea dissolving tank by a dissolving water pump. After the urea dissolving tank is filled with water, urea solution is added to dissolve the urea solution, preparing a concentrated urea solution. This concentrated urea solution is then transferred to the concentrated urea solution storage tank by a concentrated urea solution transfer pump. During denitrification operation, the concentrated urea solution is pumped from the storage tank to the online dilution system (SNCR) or urea hydrolyzer (SCR) by a concentrated urea solution output pump. Throughout the process, the dissolving water pump and the transfer pump for transferring the concentrated urea solution to the storage tank are used independently. Therefore, the utilization rate of the dissolving water pump and the transfer pump is low, resulting in high operating and maintenance costs. The dissolving water pump and the transfer pump require manual start-up and shutdown during operation, posing a significant risk of misoperation. Summary of the Invention

[0005] To address the problems of low efficiency, high workload, low operational safety, low utilization rate of dissolving and transfer pumps, high operating and maintenance costs, and the risk of misoperation associated with manual feeding, this invention provides a full-load denitrification urea automatic dissolving and transfer system that can simultaneously achieve NOx treatment across the entire load range.

[0006] The technical solution adopted by this utility model is:

[0007] A fully automated denitrified urea dissolution and transfer system, comprising:

[0008] The automatic urea feeding system automatically feeds urea into the urea dissolving tank;

[0009] The dissolving water feeding system automatically feeds dissolving water into the urea dissolving tank;

[0010] The concentrated urea solution transfer system is connected to the urea dissolving tank to transfer the dissolved concentrated urea solution to the concentrated urea solution storage tank.

[0011] An automatic control system is installed at the level measuring points of the dissolved water system and the concentrated urea solution transfer system to control the automatic stop of dissolved water feeding and concentrated urea solution feeding, and to automatically switch between the delivery of dissolved water and concentrated urea solution.

[0012] Furthermore, the automatic urea feeding system includes a urea unloading trough, a dry urea storage tank, a urea conveyor, and a urea metering conveyor; the urea unloading trough is used to hold urea unloaded from tank trucks, the dry urea storage tank is used to store dry urea, the urea conveyor is used to transport urea from the urea unloading trough to the dry urea storage tank, and the urea metering conveyor is used to quantitatively meter and transport urea from the dry urea storage tank to the urea dissolving tank.

[0013] Furthermore, the dissolved water feeding system includes a dissolved water tank, two dissolved water delivery pumps, and two dissolved transfer pumps; the two dissolved water delivery pumps are arranged in parallel, with their outlets connected to a pipeline leading into the dissolved water tank, which is used to store dissolved water; the two dissolved transfer pumps are arranged in parallel, with their inlets connected to the dissolved water tank, and their outlets connected to a pipeline via a three-way valve leading to the urea dissolving tank and the concentrated urea solution storage tank, respectively.

[0014] Furthermore, the concentrated urea solution transfer system includes a concentrated urea solution storage tank and two concentrated urea solution output pumps; the urea dissolving tank is used to dissolve granular urea, and the urea dissolving tank and the dissolving water tank are connected to the dissolving transfer pumps via a three-way valve two; the concentrated urea solution storage tank is used to store the dissolved concentrated urea solution; the two concentrated urea solution output pumps are arranged in parallel, with their inlets connected to a pipeline leading to the concentrated urea solution storage tank; the concentrated urea solution transfer route is: urea dissolving tank, three-way valve two, dissolving transfer pump, three-way valve one, and concentrated urea solution storage tank.

[0015] Furthermore, the automatic control system includes a two-way valve, an automatic control sensor, and a three-way valve; the automatic control sensor controls the start, stop, and switching of the three-way valve, the three-way valve, the dissolved water delivery pump, and the dissolved transfer pump.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This utility model can solve the problems of low efficiency, large workload and low operation safety of manual feeding of urea in boiler denitrification, and can also solve the problems of entanglement of dissolving agitator and blockage of conveying pipeline, jamming of related equipment and poor operation of denitrification system.

[0018] 2. This utility model can solve the problems of low utilization rate of boiler denitrification dissolving water pump and transfer pump, high operation and maintenance costs, and significant risk of misoperation, while achieving the effect of NOx treatment at full load.

[0019] 3. Compared with the conventional method of not sharing a urea dissolving water pump and a transfer pump, this utility model reduces one conveying system, lowers the initial investment of the project, and reduces the workload of later operation, maintenance and repair. It is suitable for large, medium and small boilers.

[0020] 4. By implementing this utility model, urea dissolution and concentrated urea solution transfer and NOx emission control can be achieved at full load. The equipment investment is low, the energy consumption is low, and the degree of automation is high. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] The components include: 1. Urea unloading trough; 2. Dry urea storage tank; 3. Urea dissolving tank; 4. Dissolving water tank; 5. Concentrated urea solution storage tank; 6. Dissolving water transfer pump; 7. Dissolving transfer pump; 8. Concentrated urea solution output pump; 9. Urea conveyor; 10. Urea metering conveyor; 11. Three-way valve one; 12. Three-way valve two; 13. Automatic control sensor. Detailed Implementation

[0023] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model will be provided below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, this utility model provides a full-load denitrification urea automatic dissolution, transfer and storage shared system, including...

[0025] The automatic urea feeding system automatically feeds urea into the urea dissolving tank 3;

[0026] The dissolving water feeding system automatically feeds dissolving water to the urea dissolving tank 3;

[0027] The concentrated urea solution transfer system is connected to the urea dissolving tank 3 to transfer the dissolved concentrated urea solution to the concentrated urea solution storage tank 5.

[0028] An automatic control system is installed at the level measuring points of the dissolved water system and the concentrated urea solution transfer system to control the automatic stop of dissolved water feeding and concentrated urea solution feeding, and to automatically switch between the delivery of dissolved water and concentrated urea solution.

[0029] The automatic urea feeding system includes a urea unloading trough 1, a dry urea storage tank 2, a urea conveyor 9, and a urea metering conveyor 10. The urea unloading trough 1 is used to hold urea unloaded from tank trucks. After leaving the raw material manufacturer, the urea is not bagged but directly loaded into tank trucks. Upon arrival, the urea is unloaded into the urea unloading trough 1. The dry urea storage tank 2 is used to store dry urea. The urea conveyor 9 is used to transport the urea from the urea unloading trough 1 to the dry urea storage tank 2. The urea metering conveyor 10 is used to quantitatively meter and transport the urea from the dry urea storage tank 2 to the urea dissolving tank 3.

[0030] The dissolved water feeding system includes a dissolved water tank 4, two dissolved water delivery pumps 6, and two dissolved transfer pumps 7. The two dissolved water delivery pumps 6 are arranged in parallel, one in operation and one on standby. Their outlets are connected to a pipeline into the dissolved water tank 4. When the dissolved water tank 4 needs to be fed, the dissolved water delivery pumps 6 are started to deliver the dissolved water to the dissolved water tank 4. The dissolved water tank 4 is used to store dissolved water and to feed the urea dissolved water into the urea dissolved tank 3. The two dissolved transfer pumps 7 are arranged in parallel, one in operation and one on standby. The dissolved transfer pumps 7 are variable frequency pumps. Their inlets are connected to a pipeline into the dissolved water tank 4, and their outlets are arranged in a pipeline that passes through a three-way valve 11 and leads to the urea dissolved tank 3 and the concentrated urea solution storage tank 5, respectively. When urea needs to be dissolved, the dissolved water tank 4 is filled with water from an external source. Then, the three-way valve 11 is opened on the side connected to the urea dissolved tank 3, and the dissolved transfer pumps 7 are started to deliver the dissolved water to the urea dissolved tank 3 to dissolve the urea.

[0031] The concentrated urea solution transfer system includes a concentrated urea solution storage tank 5 and two concentrated urea solution output pumps 8.

[0032] The urea dissolving tank 3 is equipped with a stirrer and a steam heating coil to heat the dissolving water to 40-60℃, which is used to dissolve granular urea and prepare a concentrated urea solution.

[0033] The urea dissolving tank 3 and the dissolving water tank 4 are connected to the dissolving transfer pump 7 via a three-way valve 12. The concentrated urea solution storage tank 5 is used to store the dissolved concentrated urea solution. Two concentrated urea solution output pumps 8 are arranged in parallel, one for operation and one for standby. The inlet is connected to a pipeline into the concentrated urea solution storage tank 5.

[0034] After dissolving urea to a concentration of 45%, open the three-way valve 212 to connect with the urea dissolving tank 3, and open the three-way valve 11 to connect with the concentrated urea solution storage tank 5. Start the dissolution transfer pump 7 to transport the concentrated urea solution to the concentrated urea solution storage tank 5. The stored concentrated urea solution is then transported via the concentrated urea solution output pump 8 to an online dilution system (SNCR) or a urea hydrolyzer (SCR) for subsequent denitrification reactions.

[0035] The automatic control system includes a two-way valve 12, an automatic control sensor 13, and a three-way valve 11; the automatic control sensor 13 controls the start, stop, and switching of the three-way valve 11, the three-way valve 12, the dissolved water delivery pump 6, and the dissolved transfer pump 7.

[0036] Three-way valve 212 is located at the intersection of the outlet pipelines of urea dissolving tank 3 and dissolved water tank 4 and the inlet pipeline of dissolving transfer pump 7. When the dissolved water feeding system is put into operation, the dissolved water transfer pump 6 is started to inject dissolved water into the dissolved water tank 4. When the liquid level in the dissolved water tank 4 reaches the designated level, the dissolved water transfer pump 6 is automatically stopped, the connection between three-way valve 212 and the dissolved water tank 4 is opened, and the dissolving transfer pump 7 is started to transport the dissolved water to the urea dissolving tank 3. When the liquid level in the urea dissolving tank 3 reaches the designated level, the connection between three-way valve 212 and the dissolved water tank 4 is automatically closed, and the dissolving transfer pump 7 is automatically stopped. When the concentrated urea solution transfer system is put into operation, the dissolved water transfer pump 6 is started, the connection between three-way valve 212 and the urea dissolving tank 3 is opened, and the concentrated urea solution is transported to the concentrated urea solution storage tank 5. When the liquid level in the concentrated urea solution storage tank 5 reaches the designated level, the connection between three-way valve 212 and the urea dissolving tank 3 is automatically closed.

[0037] Automatic control sensor 13 is installed at the intersection of the liquid level measuring points of urea dissolving tank 3, dissolving water tank 4, concentrated urea solution storage tank 5, and the control points of three-way valve 11, three-way valve 212, dissolving water transfer pump 6, and dissolving transfer pump 7. When the liquid level in urea dissolving tank 3 reaches the designated level, the sensor controls the closure of the connection between three-way valve 212 and dissolving water tank 4, the closure of dissolving transfer pump 7, and the closure of the connection between three-way valve 11 and urea dissolving tank 3. When the liquid level in dissolving water tank 4 reaches the designated level, the sensor controls the closure of dissolving water transfer pump 6. When the liquid level in concentrated urea solution storage tank 5 reaches the designated level, the sensor controls the closure of the connection between three-way valve 212 and urea dissolving tank 3, the closure of dissolving transfer pump 7, and the closure of the connection between three-way valve 11 and concentrated urea solution storage tank 5. The three-way valve 11 is located at the intersection of the inlet pipeline of the urea dissolving tank 3 and the concentrated urea solution storage tank 5 and the outlet pipeline of the dissolving transfer pump 7. When the dissolving system is put into operation, the side connected to the urea dissolving tank 3 is opened. When the liquid level of the urea dissolving tank 3 reaches the designated liquid level, the three-way valve 11 is closed. When the concentrated urea solution transfer system is put into operation, the three-way valve 11 is opened. When the liquid level of the concentrated urea solution storage tank 5 reaches the designated liquid level, the three-way valve 11 is closed.

[0038] This invention solves problems such as high feeding efficiency, safe feeding operation, prevention of pipeline blockage in the denitrification system, and equipment jamming. It can achieve ultra-low NOx emissions for urea dissolution, transportation, and control throughout the full load range, with low equipment investment, low energy consumption, and a high degree of automation.

[0039] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A fully automated denitrified urea dissolution, transfer, and storage system, characterized in that: include The automatic urea feeding system automatically feeds urea into the urea dissolving tank (3); The dissolving water feeding system automatically feeds dissolving water to the urea dissolving tank (3); The concentrated urea solution transfer system is connected to the urea dissolving tank (3) to transfer the dissolved concentrated urea solution to the concentrated urea solution storage tank (5). An automatic control system is installed at the level measuring points of the dissolved water system and the concentrated urea solution transfer system to control the automatic stop of dissolved water feeding and concentrated urea solution feeding, and to automatically switch between the delivery of dissolved water and concentrated urea solution.

2. The automatic dissolution, transfer, and shared system for denitrifying urea according to claim 1, characterized in that: The automatic urea feeding system includes a urea unloading trough (1), a dry urea storage tank (2), a urea conveyor (9), and a urea metering conveyor (10). The urea unloading trough (1) is used to hold urea unloaded from tank trucks. The dry urea storage tank (2) is used to store dry urea. The urea conveyor (9) is used to transport urea from the urea unloading trough (1) to the dry urea storage tank (2). The urea metering conveyor (10) is used to meter and transport urea from the dry urea storage tank (2) to the urea dissolving tank (3).

3. The automatic dissolution, transfer, and shared system for denitrifying urea according to claim 2, characterized in that: The dissolved water feeding system includes a dissolved water tank (4), two dissolved water delivery pumps (6) and two dissolved transfer pumps (7); the two dissolved water delivery pumps (6) are arranged in parallel, and their outlets are connected to a pipeline into the dissolved water tank (4). The dissolved water tank (4) is used to store dissolved water. The two dissolved transfer pumps (7) are arranged in parallel, and their inlets are connected to a pipeline into the dissolved water tank (4). The outlets are arranged with pipelines that pass through a three-way valve (11) and then lead to the urea dissolving tank (3) and the concentrated urea solution storage tank (5) respectively.

4. The automatic dissolution, transfer, and shared system for denitrifying urea according to claim 3, characterized in that: The concentrated urea solution transfer system includes a concentrated urea solution storage tank (5) and two concentrated urea solution output pumps (8). The urea dissolving tank (3) is used to dissolve granular urea, and the concentrated urea solution storage tank (5) is used to store the dissolved concentrated urea solution. The urea dissolving tank (3) and the dissolving water tank (4) are connected to the dissolving transfer pump (7) through the three-way valve two (12). Two concentrated urea solution output pumps (8) are arranged in parallel, and the inlet is connected to a pipeline connected to the concentrated urea solution storage tank (5). The concentrated urea solution transfer route is: urea dissolving tank (3), three-way valve two (12), dissolving transfer pump (7), three-way valve one (11) and concentrated urea solution storage tank (5).

5. The automatic dissolution, transfer, and shared system for denitrifying urea according to claim 4, characterized in that: The automatic control system includes a three-way valve two (12), an automatic control sensor (13), and a three-way valve one (11); the automatic control sensor (13) controls the start, stop and switching of the three-way valve one (11), the three-way valve two (12), the dissolving water delivery pump (6), and the dissolving transfer pump (7).

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