Urea system for waste incineration

Abstract

The utility model belongs to the technical field of waste incineration, and particularly discloses a urea system for waste incineration, which comprises a urea dissolving tank for preparing urea and at least two spraying devices matched with the incinerators in number, compressed air is respectively connected with each spraying device through a pipeline, and the compressed air is connected with the incinerators through a pipeline. Soft water is connected with each spraying device through a soft water tank, the urea storage tank is connected with a second main pipe, the second main pipe is connected with the spraying devices through first branch pipes, and each first branch pipe is provided with a urea pump used for providing power. According to the utility model, the branch pipes matched with the spraying devices in number are respectively arranged, and each branch pipe is provided with the urea pump for providing power, that is, urea is independently supplied to the spraying devices in a one-to-one manner, and each branch pipe is provided with an independent power system, so that the phenomenon that three incinerators grab milk is avoided, and the service life of the three incinerators is prolonged. And normal supply of urea required by each incinerator is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage incineration, in particular to a urea system used for garbage incineration. Background Art

[0002] In the waste incinerator, some harmful gases will be produced during the incineration process. In order to strictly control the flue gas emission standards, the harmful gases need to be effectively treated before being discharged. For example, nitrogen oxides in the flue gas need to be neutralized by spraying urea into the incinerator before being discharged.

[0003] Reference Figure 1 The urea system of the prior art comprises a urea dissolving tank (1) for preparing urea and three injection devices (6) matching the number of incinerators, the injection devices (6) being used to inject urea into the incinerator, compressed air being connected to each injection device (6) through a pipeline, soft water being connected to each injection device (6) through a soft water tank (3), a water delivery pump (301) for providing power being arranged on the pipeline connecting the soft water tank (3) and the injection device (6), the urea dissolving tank (1) being connected to a urea storage tank (2) through a first main pipe (101), a delivery pump (104) being arranged on the first main pipe (101), the urea storage tank (2) being connected to each injection device (6) through a second main pipe (201), a urea pump (203) for providing power being arranged on the second main pipe (201).

[0004] Through the above structural analysis, since the three injection devices share one urea pump and belong to a shared mother pipe, when the pressure of the front-end urea pump is insufficient, or the urea consumption of one of the three furnaces increases, the three furnaces will "grab milk", that is, the urea injection amount of some injection devices will be insufficient; and the urea supply of the injection device closer to the urea pump will be sufficient, while the urea supply of the injection device farther away from the urea pump will be insufficient; in addition, the above urea system has no pressure relief device, which can easily cause pressure buildup in the pipeline, thereby causing pipeline rupture or damage to the urea pump. Utility Model Content

[0005] Aiming at the technical problems that the prior art urea system adopts a common main pipe, which leads to uneven urea injection amounts of multiple injection devices and easy damage of pipes and urea pumps, the utility model provides a urea system for garbage incineration.

[0006] The technical scheme adopted by the utility model is: a urea system for garbage incineration, comprising a urea dissolving tank for preparing urea and at least two injection devices matching the number of incinerators, the injection devices are used to inject urea into the incinerator, compressed air is respectively connected to each injection device through a pipeline, soft water is respectively connected to each injection device through a soft water tank, a water delivery pump for providing power is arranged on the pipeline connecting the soft water tank and the injection device, the urea dissolving tank is connected to a urea storage tank through a first main pipe, the urea storage tank is connected to a second main pipe, the second main pipe is connected to the injection device through a first branch pipe, the number of the first branch pipes matches the number of the injection devices, and a urea pump for providing power is arranged on each first branch pipe.

[0007] Furthermore, a spare pipe is also included, one end of which is connected to the second main pipe, and the other end is connected to each first branch pipe through a second branch pipe. The number of the second branch pipes matches the first branch pipes, and a valve is provided on the second branch pipe.

[0008] Furthermore, it also includes a flushing pipe connected to the second main pipe, the flushing pipe is used to clean the first branch pipe and the injection device, and a flushing valve is arranged on the flushing pipe.

[0009] Furthermore, the urea dissolving tank is connected with a third branch pipe and a fourth branch pipe, and the urea dissolving tank is connected with the first main pipe through the third branch pipe and the fourth branch pipe respectively, and the third branch pipe and the fourth branch pipe are provided with a delivery pump and corresponding valves for providing power.

[0010] Furthermore, each first branch pipe connected to the output end of the urea pump is connected to a first pressure relief pipe, the other end of the first pressure relief pipe is connected to the urea storage tank, and a first pressure relief valve is arranged on the first pressure relief pipe.

[0011] Furthermore, the first pressure relief valve is an electric valve.

[0012] Furthermore, a second pressure relief pipe is provided on the pipeline connecting the water delivery pump and the injection device, the other end of the second pressure relief pipe is connected to the soft water tank, and a second pressure relief valve is provided on the second pressure relief pipe.

[0013] Furthermore, the second pressure relief valve is a manual valve.

[0014] Furthermore, a third pressure relief pipe is arranged on the first main pipe, the other end of the third pressure relief pipe is connected to the urea dissolution tank, and a third pressure relief valve is arranged on the third pressure relief pipe.

[0015] Furthermore, the third pressure relief valve is a manual valve.

[0016] The beneficial effects of the utility model are:

[0017] 1. Compared with the setting mode of the prior art urea system sharing the main pipe, the utility model respectively sets branch pipes matching the number of injection devices, and a urea pump for providing power is provided on each branch pipe, that is, a one-to-one mode is adopted to supply urea to the injection device separately, and each branch pipe has an independent power system, thereby avoiding the phenomenon of "grabbing milk" among the three incinerators and ensuring the normal supply of urea required by each incinerator.

[0018] 2. The spare pipe of the utility model can realize the online maintenance of the urea pump without stopping the machine, making the maintenance process more convenient and quick, and does not affect the normal production, thus ensuring the orderly production process.

[0019] 3. The flushing pipe of the utility model can clean the urea remaining in the first branch pipe in time, thereby avoiding the situation where the residual urea crystallizes in the pipe and then blocks the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a prior art urea system.

[0021] Figure 2 The utility model is a schematic diagram of the structure of a urea system for garbage incineration.

[0022] The markings in the figure are:

[0023] 1. Urea dissolving tank; 101. First main pipe; 102. Third branch pipe; 103. Fourth branch pipe; 105. Third pressure relief pipe; 106. Third pressure relief valve;

[0024] 2. Urea storage tank; 201. Second main pipe; 202. First branch pipe; 203. Urea pump; 204. First pressure relief pipe; 205. First pressure relief valve;

[0025] 3. Soft water tank; 301. Water delivery pump; 302. Second pressure relief pipe; 303. Second pressure relief valve;

[0026] 4. Spare pipe; 401. Second branch pipe;

[0027] 5. Flushing pipe; 501. Flushing valve. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be noted that the terms "front", "up", "down", "left", "right", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The following is combined with Figure 2 The utility model is further described.

[0031] Embodiment 1

[0032] In view of the technical problems existing in the background technology, the utility model provides a urea system for garbage incineration. This embodiment takes three incinerators of a company as an example. The three incinerators need to be equipped with three injection devices.

[0033] In the specific technical solution, the urea system for waste incineration includes a urea dissolving tank 1 for preparing urea and three injection devices 6 matching the number of incinerators. The injection devices 6 are used to inject urea into the incinerator. Compressed air is connected to each injection device 6 through a pipeline, and soft water is connected to each injection device 6 through a soft water tank 3. A water pump 301 for providing power is provided on the pipeline connecting the soft water tank 3 and the injection device 6. The urea dissolving tank 1 is connected to the urea storage tank 2 through a first main pipe 101.

[0034] Principle of urea system: Since the nozzle of the injection device is set in the incinerator, the temperature in the incinerator is as high as 850℃~1400℃, so the nozzle is in a high temperature environment and needs to be cooled. For this reason, soft water is introduced into the injection device to cool the nozzle; the purpose of introducing compressed air into the injection device is to atomize urea and provide injection power.

[0035] The above structure is the same as that of the prior art urea system. However, the prior art urea system adopts a shared mother pipe. When the pressure of the front end urea pump is insufficient, or the urea consumption of one of the three furnaces increases, the three furnaces will "grab milk", that is, the urea injection amount of some injection devices will be insufficient; and the injection devices closer to the urea pump will have sufficient urea supply, while the injection devices farther from the urea pump will have insufficient urea supply. To this end, the utility model makes the following improvements: Referring to Figure 2 In the utility model, a second main pipe 201 is connected to the urea storage tank 2. The second main pipe 201 is connected to three injection devices 6 through three first branch pipes 202 respectively. A urea pump 203 for providing power is provided on each first branch pipe 202.

[0036] It can be seen from the above structure that compared with the setting method of the prior art urea system sharing the main pipe, the utility model respectively sets branch pipes matching the number of injection devices, and a urea pump for providing power is provided on each branch pipe, that is, a one-to-one method is adopted to supply urea to the injection device separately, and each branch pipe has an independent power system, thereby avoiding the phenomenon of three incinerators "grabbing milk" and ensuring the normal supply of urea required by each incinerator.

[0037] In order to realize the online inspection and maintenance of the delivery pump and to increase the service life of the delivery pump, refer to Figure 2 Therefore, in this embodiment, the urea dissolving tank 1 is also connected with a third branch pipe 102 and a fourth branch pipe 103. The urea dissolving tank 1 is connected to the first main pipe 101 through the third branch pipe 102 and the fourth branch pipe 103 respectively. The third branch pipe 102 and the fourth branch pipe 103 are provided with a delivery pump 104 and a corresponding valve for providing power. From the above structure, it can be seen that in the present application, the urea in the urea dissolving tank 1 can be delivered to the urea storage tank 2 through two branch pipes. Under normal circumstances, a one-standby-one-use method is adopted. When a delivery pump fails or needs to be repaired, another branch pipe is used for delivery, so that the online repair and maintenance of the delivery pump can be realized; and in order to avoid a single delivery pump from running at high load for a long time, under normal circumstances, the two delivery pumps can also be used alternately, thereby protecting the delivery pump and effectively improving the service life of the delivery pump.

[0038] To avoid damage to pipelines and equipment caused by pressure build-up in pipelines, refer to Figure 2 Therefore, in this embodiment, each first branch pipe 202 connected to the output end of the urea pump 203 is connected with a first pressure relief pipe 204, and the other end of the first pressure relief pipe 204 is connected to the urea storage tank 2. The first pressure relief valve 205 is provided on the first pressure relief pipe 204, and the first pressure relief valve 205 is an electric valve. Because the power of the urea pump 203 is certain, if the amount of urea required by the incinerator is small, it is necessary to adjust the valve on the first branch pipe 202 to a smaller position. At this time, the urea flow in the first branch pipe 202 is small, and the power of the urea pump 203 remains unchanged, which will cause the pressure in the first branch pipe 202 between the urea pump 203 and the valve to increase, and eventually lead to the situation of pipeline bursting or urea pump damage. Therefore, in order to avoid the above situation, the first pressure relief pipe 204 is provided in this embodiment. When the pressure in the first branch pipe 202 is high, that is, the amount of urea required by the incinerator is small, the first pressure relief valve 205 is opened, and part of the urea at this time flows back to the urea storage tank 2 through the first pressure relief pipe 204, thereby reducing the pressure in the first branch pipe 202, thereby avoiding the occurrence of pipeline bursting or urea pump damage.

[0039] In addition, in this embodiment, a second pressure relief pipe 302 is provided on the pipeline connecting the water delivery pump 301 and the injection device 6, the other end of the second pressure relief pipe 302 is connected to the soft water tank 3, and a second pressure relief valve 303 is provided on the second pressure relief pipe 302, and the second pressure relief valve 303 is a manual valve. At the same time, a third pressure relief pipe 105 is provided on the first main pipe 101, and the other end of the third pressure relief pipe 105 is connected to the urea dissolution tank 1, and a third pressure relief valve 106 is provided on the third pressure relief pipe 105, and the third pressure relief valve 106 is a manual valve. The working mode and working principle of the second pressure relief pipe 302 and the third pressure relief pipe 105 are the same as those of the first pressure relief pipe 204, and are all for reducing the pressure in the corresponding pipeline, and the first pressure relief pipe 204 can be referred to, therefore, the specific working mode and working principle of the second pressure relief pipe 302 and the third pressure relief pipe 105 will not be repeated here.

[0040] Embodiment 2

[0041] To realize the online maintenance of urea pump, refer to Figure 2 Therefore, based on the first embodiment, a spare pipe 4 is further provided in this embodiment.

[0042] Specifically, one end of the standby pipe 4 is connected to the second main pipe 201, and the other end is connected to each first branch pipe 202 through a second branch pipe 401. The number of the second branch pipes 401 matches the first branch pipes 202, and a valve is provided on the second branch pipe 401. In addition, based on the same principle as in the first embodiment, a pressure relief pipe connected to the urea storage tank 2 is also provided on the standby pipe 4 in the present application.

[0043] Working principle: Under normal conditions, the spare pipe 4 is in a closed state through valve control. At this time, urea flowing out from the second main pipe 201 is transported to the injection device through the three first branch pipes 202 respectively, and the urea does not flow through the spare pipe at this time; when the urea pump of a first branch pipe 202 fails or needs to be repaired, the valve on the first branch pipe 202 where the fault occurs is controlled to cut off the first branch pipe 202, so that the failed urea pump can be repaired, and then the valve on the spare pipe 4 and the urea pump are opened, and the urea at this time flows through the spare pipe 4 to the first branch pipe 202 where the fault occurs.

[0044] It can be seen from the above structure and working principle that the newly added spare pipe in this embodiment can realize online maintenance of the urea pump without stopping the machine, making the maintenance process more convenient and quick, and does not affect the normal production, thus ensuring the orderly production process.

[0045] Embodiment 3

[0046] To prevent the residual urea from crystallizing in the pipeline and causing pipeline blockage, refer to Figure 2 Therefore, based on the first embodiment, a flushing pipe 5 is newly provided in this embodiment.

[0047] Specifically, the flushing pipe 5 is connected to the second main pipe 201 . The flushing pipe 5 is used to clean the first branch pipe 202 and the injection device 6 . A flushing valve 501 is provided on the flushing pipe 5 .

[0048] Working principle: after each urea injection of the incinerator is completed, some urea will remain in the first branch pipe 202 and the setting device. If the residual urea cannot be discharged in time, it will form crystals on the inner wall of the pipe, which will become thicker and thicker over time, eventually causing the first branch pipe to be blocked, affecting the transportation of urea. For this reason, the present application introduces cleaning water into the first branch pipe 202 through the flushing pipe after each urea injection of the incinerator is completed, and timely cleans the urea remaining in the first branch pipe, thereby avoiding the situation where the residual urea crystallizes in the pipe and then blocks the pipe.

[0049] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A urea system for waste incineration, comprising a urea dissolving tank (1) for preparing urea and at least two spraying devices (6) matching the number of incinerators, the spraying devices (6) being used to spray urea into the incinerator, compressed air being connected to each spraying device (6) through a pipeline, soft water being connected to each spraying device (6) through a soft water tank (3), a water delivery pump (301) for providing power being arranged on the pipeline connecting the soft water tank (3) and the spraying device (6), the urea dissolving tank (1) being connected to a urea storage tank (2) through a first main pipe (101), characterized in that: The urea storage tank (2) is connected to a second main pipe (201), the second main pipe (201) is connected to an injection device (6) via a first branch pipe (202), the number of the first branch pipes (202) matches the number of the injection devices (6), and each first branch pipe (202) is provided with a urea pump (203) for providing power.

2. The urea system for waste incineration according to claim 1, characterized in that: The system also comprises a spare pipe (4), one end of which is connected to the second main pipe (201), and the other end of which is connected to each first branch pipe (202) through a second branch pipe (401). The number of the second branch pipes (401) matches that of the first branch pipes (202), and a valve is provided on the second branch pipe (401).

3. The urea system for waste incineration according to claim 1, characterized in that: It also includes a flushing pipe (5) connected to the second main pipe (201), the flushing pipe (5) is used to clean the first branch pipe (202) and the spray device (6), and a flushing valve (501) is provided on the flushing pipe (5).

4. The urea system for waste incineration according to claim 1, characterized in that: The urea dissolving tank (1) is connected to a third branch pipe (102) and a fourth branch pipe (103); the urea dissolving tank (1) is connected to the first main pipe (101) via the third branch pipe (102) and the fourth branch pipe (103), respectively; and a delivery pump (104) for providing power and corresponding valves are provided on the third branch pipe (102) and the fourth branch pipe (103).

5. The urea system for waste incineration according to claim 1, characterized in that: Each first branch pipe (202) connected to the output end of the urea pump (203) is connected to a first pressure relief pipe (204), the other end of the first pressure relief pipe (204) is connected to the urea storage tank (2), and a first pressure relief valve (205) is provided on the first pressure relief pipe (204).

6. The urea system for waste incineration according to claim 5, characterized in that: The first pressure relief valve (205) is an electric valve.

7. The urea system for waste incineration according to claim 1, characterized in that: A second pressure relief pipe (302) is provided on the pipeline connecting the water delivery pump (301) and the injection device (6); the other end of the second pressure relief pipe (302) is connected to the soft water tank (3); and a second pressure relief valve (303) is provided on the second pressure relief pipe (302).

8. The urea system for waste incineration according to claim 7, characterized in that: The second pressure relief valve (303) is a manual valve.

9. The urea system for waste incineration according to claim 1, characterized in that: The first main pipe (101) is provided with a third pressure relief pipe (105), the other end of the third pressure relief pipe (105) is connected to the urea dissolving tank (1), and the third pressure relief pipe (105) is provided with a third pressure relief valve (106).

10. The urea system for waste incineration according to claim 9, characterized in that: The third pressure relief valve (106) is a manual valve.

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