A sewage treatment concentrate high-temperature flue gas evaporation system

Abstract

The application discloses a sewage treatment concentrated liquid high-temperature flue gas evaporation system, which comprises a concentrated water tank, a DCS control system and a spray gun arranged on a boiler wall, the water inlet of the concentrated water tank is connected with an industrial water pipeline, a concentrated liquid pipeline and a flue gas washing wastewater pipeline respectively, the first water outlet of the concentrated water tank is connected with a concentrated liquid back-spraying main pipe, the concentrated liquid back-spraying main pipe is connected with the spray gun through a boiler branch pipe, the spray gun is connected with a compressed air pipeline, a compressed air pressure regulating valve is arranged on the compressed air pipeline, a main pipe flow meter is arranged on the concentrated liquid back-spraying main pipe, a first electric regulating valve is arranged on the boiler branch pipe, a branch pipe flow meter is arranged between the first electric regulating valve and the spray gun, the main pipe flow meter and the branch pipe flow meter are in communication connection with the DCS control system, and the DCS control system is in communication connection with the compressed air pressure regulating valve and the first electric regulating valve respectively. The concentrated liquid consumption capacity can be effectively improved, and the problems of easy scaling and clogging of the spray gun and burning damage can be avoided.

Description

Technical Field

[0001] This application relates to the field of wastewater concentrate treatment technology, and in particular to a high-temperature flue gas evaporation system for wastewater concentrate. Background Technology

[0002] Currently, existing boiler concentrate re-injection furnace systems use fixed re-injection guns and manual ball valves for piping. Each time the concentrate re-injection gun is engaged or disengaged, operators must be physically present to perform the operation, significantly increasing their workload. Furthermore, failure to promptly disengage the concentrate re-injection gun in situations such as concentrate pipeline leaks or low furnace temperatures during boiler operation can negatively impact boiler operation and the surrounding environment. Therefore, this invention proposes a high-temperature flue gas evaporation system for wastewater treatment concentrate. Summary of the Invention

[0003] This application provides a high-temperature flue gas evaporation system for wastewater treatment concentrate, which can effectively improve the concentrate's absorption capacity while avoiding problems such as scaling, clogging, and burnout of the spray gun.

[0004] In view of this, this application provides a high-temperature flue gas evaporation system for wastewater treatment concentrate, including: a concentrate tank, a DCS control system, and spray guns installed on the boiler furnace wall;

[0005] The first inlet of the concentrate tank is connected to an industrial water pipeline;

[0006] The second inlet of the concentrate tank is connected to the concentrate pipeline;

[0007] The third inlet of the concentrated water tank is connected to the flue gas washing wastewater pipeline;

[0008] The first outlet of the concentrate tank is connected to the concentrate return spray header.

[0009] The concentrated liquid return spray main pipe is connected to the spray gun through a boiler branch pipe;

[0010] The spray gun is connected to a compressed air pipe;

[0011] The compressed air pipeline is equipped with a compressed air pressure regulating valve;

[0012] A main pipe flow meter is installed on the concentrated liquid return spray main pipe;

[0013] A first electric regulating valve is installed on the boiler branch pipe;

[0014] A branch flow meter is installed between the first electric regulating valve and the spray gun;

[0015] Both the main pipe flow meter and the branch pipe flow meter are communicatively connected to the DCS control system.

[0016] The DCS control system is communicatively connected to the compressed air pressure regulating valve and the first electric regulating valve, respectively.

[0017] Optionally, the concentrate return spray header includes a main return spray pipe, a first branch pipe, and a second branch pipe;

[0018] The first branch pipe and the second branch pipe are connected in parallel;

[0019] The first end of the first branch pipe and the first end of the second branch pipe are both connected to the first outlet of the concentrate tank.

[0020] The second end of the first branch pipe and the second end of the second branch pipe are both connected to the main return spray pipe;

[0021] The main return spray pipe is connected to the boiler branch pipe;

[0022] The first branch pipe is sequentially equipped with a first inlet manual valve, a first filter, a first backflow pump, a first outlet manual valve, and a first check valve;

[0023] The second branch pipe is sequentially equipped with a second inlet manual valve, a second filter, a second backflow pump, a second outlet manual valve, and a second check valve;

[0024] The main flow meter is installed on the main return flow pipe;

[0025] The DCS control system is communicatively connected to the first backflow pump and the second backflow pump, respectively.

[0026] Optionally, the main return pipe is also equipped with a main pipe pressure gauge;

[0027] The main pipe pressure gauge is communicatively connected to the DCS control system.

[0028] Optionally, the concentrate return spray header is connected to the concentrate tank via a return header;

[0029] A manual return valve is installed on the return header.

[0030] Optionally, a level gauge is installed inside the concentrate tank;

[0031] The level gauge is communicatively connected to the DCS control system.

[0032] Optionally, a second electric regulating valve is installed on the industrial water pipeline;

[0033] A third electric regulating valve is installed on the concentrate pipeline;

[0034] A fourth electric regulating valve is installed on the wastewater pipeline for the tobacco washing process.

[0035] The second, third, and fourth electric regulating valves are all communicatively connected to the DCS control system.

[0036] Optionally, a manual valve for the branch pipe is also provided on the boiler branch pipe;

[0037] The concentrated liquid pipeline, the industrial water pipeline, and the wastewater pipeline for washing flue gas are all equipped with manual inlet valves.

[0038] Optionally, a manual compressed air valve is also provided on the compressed air pipeline.

[0039] Optionally, the spray gun is a two-fluid atomizing spray gun.

[0040] Optionally, the two-fluid atomizing spray gun includes an outer barrel and an inner barrel;

[0041] The boiler branch pipe is connected to the inner gun barrel;

[0042] The compressed air pipe is connected to the outer gun barrel.

[0043] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This high-temperature flue gas evaporation system for wastewater treatment concentrate utilizes the atomization effect of the spray gun to form fine droplets of concentrate, increasing the contact area with high-temperature flue gas, thereby enabling rapid evaporation and combustion, effectively improving the concentrate's absorption capacity. Simultaneously, by installing a main pipe flow meter on the concentrate return main pipe, a first electric regulating valve on the boiler branch pipe, and a branch pipe flow meter between the first electric regulating valve and the spray gun, the flow rates of the concentrate return main pipe and boiler branch pipe can be detected in real time by the main pipe flow meter and the branch pipe flow meter, and the data is transmitted to the DCS control system. The DCS control system then controls the compressed air pressure regulating valve and the first electric regulating valve to automatically adjust the pressure according to the concentrate flow rate, ensuring the atomization effect and solving the problem of scale buildup, blockage, and burnout of the spray gun caused by untimely manual on-site operation. Furthermore, this evaporation system, by installing a concentrate tank and an industrial water pipeline connected to the concentrate tank, allows for flushing of all pipelines with industrial water when the concentrate is insufficient, preventing pipe blockage and ensuring the stable operation of the entire system. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the high-temperature flue gas evaporation system for wastewater treatment concentrate in the embodiments of this application;

[0045] The attached figures are labeled as follows:

[0046] 1-Concentrate tank, 2-Boiler furnace wall, 3-Spray gun, 4-First branch pipe, 5-Second branch pipe, 6-Return spray main pipe, 7-Boiler branch pipe, 8-Compressed air pipeline, 9-Return main pipe, 10-Industrial water pipeline, 11-Concentrate pipeline, 12-Scrubber wastewater pipeline, 13-Main pipe flow meter, 14-Branch pipe flow meter, 15-First electric regulating valve, 16-Compressed air pressure regulating valve, 17-First inlet manual valve, 18-First filter, 1 9-First return pump, 20-First outlet manual valve, 21-First check valve, 22-Second inlet manual valve, 23-Second filter, 24-Second return pump, 25-Second outlet manual valve, 26-Second check valve, 27-Main pipe pressure gauge, 28-Return manual valve, 29-Second electric regulating valve, 30-Third electric regulating valve, 31-Fourth electric regulating valve, 32-Level gauge, 33-Compressed air manual valve, 34-Branch pipe manual valve. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0048] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] This application provides an embodiment of a high-temperature flue gas evaporation system for wastewater treatment concentrate. Please refer to the following for details. Figure 1 .

[0051] The wastewater treatment concentrate high-temperature flue gas evaporation system in this embodiment includes: a concentrate tank 1, a DCS control system, and a spray gun 3 installed on the boiler furnace wall 2. The first inlet of the concentrate tank 1 is connected to an industrial water pipe 10, the second inlet of the concentrate tank 1 is connected to a concentrate pipe 11, the third inlet of the concentrate tank 1 is connected to a flue gas washing wastewater pipe 12, the first outlet of the concentrate tank 1 is connected to a concentrate return spray main pipe, the concentrate return spray main pipe is connected to the spray gun 3 through a boiler branch pipe 7, the spray gun 3 is connected to a compressed air pipe 8, a compressed air pressure regulating valve 16 is installed on the compressed air pipe 8, a main pipe flow meter 13 is installed on the concentrate return spray main pipe, a first electric regulating valve 15 is installed on the boiler branch pipe 7, a branch pipe flow meter 14 is installed between the first electric regulating valve 15 and the spray gun 3, the main pipe flow meter 13 and the branch pipe flow meter 14 are both communicatively connected to the DCS control system, and the DCS control system is communicatively connected to the compressed air pressure regulating valve 16 and the first electric regulating valve 15 respectively.

[0052] It should be noted that this wastewater treatment concentrate high-temperature flue gas evaporation system utilizes the atomization effect of the spray gun 3 to form fine droplets of concentrate, increasing the contact area with high-temperature flue gas, thereby enabling rapid evaporation and combustion. This effectively improves the concentrate's absorption capacity. Simultaneously, by installing a main pipe flow meter 13 on the concentrate return main pipe, a first electric regulating valve 15 on the boiler branch pipe 7, and a branch pipe flow meter 14 between the first electric regulating valve 15 and the spray gun 3, the flow rates of the concentrate return main pipe and boiler branch pipe 7 can be detected in real time by the main pipe flow meter 13 and the branch pipe flow meter 14. The data is transmitted to the DCS control system, which then controls the compressed air pressure regulating valve 16 and the first electric regulating valve 15 to automatically adjust the pressure according to the concentrate flow rate. This ensures the atomization effect and solves the problem of scale buildup, blockage, and burnout of the spray gun 3 caused by untimely manual on-site operation. In addition, this evaporation system is equipped with a concentrate tank 1 and an industrial water pipeline 10 connected to the concentrate tank 1. When the concentrate is insufficient, industrial water can be used to flush all pipelines (by conveying industrial water to flush all pipelines, the water outlet is sent to the furnace through the spray gun 3) to prevent pipeline blockage, thereby ensuring the stable operation of the entire system.

[0053] The above is Embodiment 1 of a high-temperature flue gas evaporation system for wastewater treatment concentrate provided in this application. The following is Embodiment 2 of the same system. Please refer to the following for details. Figure 1 .

[0054] The wastewater treatment concentrate high-temperature flue gas evaporation system in this embodiment includes: a concentrate tank 1, a DCS control system, and spray guns 3 installed on the boiler furnace wall 2. The first inlet of the concentrate tank 1 is connected to an industrial water pipe 10 for cleaning various pipes; the second inlet of the concentrate tank 1 is connected to a concentrate pipe 11; the third inlet of the concentrate tank 1 is connected to a flue gas washing wastewater pipe 12; the first outlet of the concentrate tank 1 is connected to a concentrate return spray header, which is connected to the spray guns 3 via a boiler branch pipe 7. The spray guns 3 are connected to... Compressed air pipeline 8 provides compressed air for cooling and atomizing the spray gun 3. A compressed air pressure regulating valve 16 is installed on the compressed air pipeline 8. A main pipe flow meter 13 is installed on the concentrated liquid return spray main pipe. A first electric regulating valve 15 is installed on the boiler branch pipe 7. A branch pipe flow meter 14 is installed between the first electric regulating valve 15 and the spray gun 3. Both the main pipe flow meter 13 and the branch pipe flow meter 14 are communicatively connected to the DCS control system. The DCS control system is communicatively connected to the compressed air pressure regulating valve 16 and the first electric regulating valve 15, respectively.

[0055] Understandably, this wastewater treatment concentrate high-temperature flue gas evaporation system can automatically adjust the pressure according to the concentrate flow rate through the DCS control system, thereby solving the problems of scaling and burnt-out nozzles caused by long-term low pressure clogging.

[0056] The concentrate return spray main pipe includes a return spray main pipe 6, a first branch pipe 4, and a second branch pipe 5. The first branch pipe 4 and the second branch pipe 5 are arranged in parallel. The first end of the first branch pipe 4 and the first end of the second branch pipe 5 are both connected to the first outlet of the concentrate tank 1. The second end of the first branch pipe 4 and the second end of the second branch pipe 5 are both connected to the return spray main pipe 6. The return spray main pipe 6 is connected to the boiler branch pipe 7. The first branch pipe 4 is sequentially equipped with a first inlet manual valve 17, a first filter 18, a first return spray pump 19, a first outlet manual valve 20, and a first check valve 21. The second branch pipe 5 is sequentially equipped with a second inlet manual valve 22, a second filter 23, a second return spray pump 24, a second outlet manual valve 25, and a second check valve 26. The main pipe flow meter 13 is installed on the return spray main pipe 6. The DCS control system is communicatively connected to the first return spray pump 19 and the second return spray pump 24.

[0057] It should be noted that by setting up the first branch pipe 4 and the second branch pipe 5 in parallel, one of the branch pipes can be used as a backup, so that when one line is under maintenance, the other line can be used to keep the back spray running continuously.

[0058] The main injection pipe 6 is also equipped with a main pipe pressure gauge 27, which is connected to the DCS control system.

[0059] The concentrate return spray header is connected to the concentrate tank 1 via the return header 9. The return header 9 is equipped with a return manual valve 28, which controls the return of excess concentrate to the concentrate tank 1. Specifically, one end of the return spray main pipe 6 is connected to the return header 9 and the boiler branch pipe 7, respectively, and the return header 9 is connected to the return water port of the concentrate tank 1.

[0060] A level gauge 32 is installed inside the concentrate tank 1, and the level gauge 32 is connected to the DCS control system.

[0061] A second electric regulating valve 29 is installed on the industrial water pipeline 10; a third electric regulating valve 30 is installed on the concentrate pipeline 11; and a fourth electric regulating valve 31 is installed on the flue gas washing wastewater pipeline 12. The second electric regulating valve 29, the third electric regulating valve 30, and the fourth electric regulating valve 31 are all connected to the DCS control system.

[0062] A branch pipe manual valve 34 is also installed on the boiler branch pipe 7, and an inlet manual valve is installed on the concentrate pipe 11, the industrial water pipe 10 and the flue gas washing wastewater pipe 12.

[0063] A manual compressed air valve 33 is also installed on the compressed air pipeline 8.

[0064] The spray gun 3 is a two-fluid atomizing spray gun 3. Specifically, the two-fluid atomizing spray gun 3 includes an outer gun tube and an inner gun tube. The boiler branch pipe 7 is connected to the inner gun tube, and the compressed air pipe 8 is connected to the outer gun tube. The liquid enters through the inner gun tube, and the compressed air enters through the outer gun tube, and atomization is achieved at the atomizing section at the end of the spray gun 3. The compressed air pressure can be controlled at 0.3~0.4 MPa, and the concentrated liquid inlet pressure of the spray gun 3 is 0.3~0.4 MPa.

[0065] A method for high-temperature flue gas evaporation of wastewater treatment concentrate based on the above-mentioned high-temperature flue gas evaporation system for wastewater treatment concentrate is disclosed. The method specifically includes: conveying the concentrate from the concentrate tank 1 to the spray gun 3 via the concentrate return main pipe and boiler branch pipe 7; conveying compressed air to the spray gun 3 via the compressed air pipeline 8; and atomizing the concentrate in the spray gun 3 to form fine droplets, increasing the contact area with the high-temperature flue gas, thereby enabling rapid evaporation and combustion. During this process, the main pipe flow meter 13 and the branch pipe flow meter 14 monitor the flow rate of the concentrate return main pipe and boiler branch pipe 7 in real time and transmit the data to the DCS control system. The DCS control system then controls the compressed air pressure regulating valve 16 and the first electric regulating valve 15 to automatically adjust the pressure, ensuring the atomization effect and solving the problem of scale buildup, blockage, and burnout of the spray gun 3 caused by untimely manual on-site intervention.

[0066] Specifically, the inlet end of the concentrate pipeline 11 is connected to the concentrate tank. When the concentrate tank level is below 3m, the third electric regulating valve 30 and the fourth electric regulating valve 31 automatically close.

[0067] When the liquid level in the concentrate tank 1 is higher than 0.3m and lower than 1.5m, the liquid in the concentrate tank 1 is flushed through the first return spray pump 19 or the second return spray pump 24 to flush the concentrate return spray header and boiler branch pipe 7, and finally returned to the furnace through the spray gun 3.

[0068] When the liquid level in concentrate tank 1 drops below 0.4m, the second electric regulating valve 29 automatically opens to replenish water until the liquid level in concentrate tank 1 reaches 1.5m. At this point, the second electric regulating valve 29 closes, completing one water replenishment operation. This process is repeated until the water replenishment is completed three times, at which point the second electric regulating valve 29 completely closes, ending the water replenishment operation.

[0069] When the liquid level in the concentrate tank 1 is below 0.3m, the flushing and back spraying are completed. At this time, the first back spraying pump 19 or the second back spraying pump 24 that is running will be automatically stopped, and the first electric regulating valve 15 will be closed. At the same time, the compressed air pressure regulating valve 16 will be adjusted to increase the pressure (from 0.2MPa to 0.3MPa) to prevent the spray gun 3 from being burned out.

[0070] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A high-temperature flue gas evaporation system for wastewater treatment concentrate, characterized in that, include: Concentrate tank, DCS control system and spray guns mounted on the boiler wall; The first inlet of the concentrate tank is connected to an industrial water pipeline; The second inlet of the concentrate tank is connected to the concentrate pipeline; The third inlet of the concentrated water tank is connected to the flue gas washing wastewater pipeline; The first outlet of the concentrate tank is connected to the concentrate return spray header. The concentrated liquid return spray main pipe is connected to the spray gun through a boiler branch pipe; The spray gun is connected to a compressed air pipe; The compressed air pipeline is equipped with a compressed air pressure regulating valve; A main pipe flow meter is installed on the concentrated liquid return spray main pipe; A first electric regulating valve is installed on the boiler branch pipe; A branch flow meter is installed between the first electric regulating valve and the spray gun; Both the main pipe flow meter and the branch pipe flow meter are communicatively connected to the DCS control system. The DCS control system is communicatively connected to the compressed air pressure regulating valve and the first electric regulating valve, respectively. The concentrated liquid return spray main pipe includes a return spray main pipe, a first branch pipe, and a second branch pipe; The first branch pipe and the second branch pipe are connected in parallel; The first end of the first branch pipe and the first end of the second branch pipe are both connected to the first outlet of the concentrate tank. The second end of the first branch pipe and the second end of the second branch pipe are both connected to the main return spray pipe; The main return spray pipe is connected to the boiler branch pipe; The first branch pipe is sequentially equipped with a first inlet manual valve, a first filter, a first backflow pump, a first outlet manual valve, and a first check valve; The second branch pipe is sequentially equipped with a second inlet manual valve, a second filter, a second backflow pump, a second outlet manual valve, and a second check valve; The main flow meter is installed on the main return flow pipe; The DCS control system is communicatively connected to the first backflow pump and the second backflow pump, respectively. The main return jet pipe is also equipped with a main pipe pressure gauge; The main pipe pressure gauge is communicatively connected to the DCS control system. The concentrate return spray header is connected to the concentrate tank via a return header; A manual return valve is installed on the return header.

2. The high-temperature flue gas evaporation system for wastewater treatment concentrate according to claim 1, characterized in that, The concentrate tank is equipped with a level gauge. The level gauge is communicatively connected to the DCS control system.

3. The high-temperature flue gas evaporation system for wastewater treatment concentrate according to claim 1, characterized in that, A second electric regulating valve is installed on the industrial water pipeline; A third electric regulating valve is installed on the concentrate pipeline; A fourth electric regulating valve is installed on the wastewater pipeline for the tobacco washing process. The second, third, and fourth electric regulating valves are all communicatively connected to the DCS control system.

4. The high-temperature flue gas evaporation system for wastewater treatment concentrate according to claim 1, characterized in that, The boiler branch pipe is also equipped with a manual branch pipe valve; The concentrated liquid pipeline, the industrial water pipeline, and the wastewater pipeline for washing flue gas are all equipped with manual inlet valves.

5. The high-temperature flue gas evaporation system for wastewater treatment concentrate according to claim 1, characterized in that, The compressed air pipeline is also equipped with a manual compressed air valve.

6. The high-temperature flue gas evaporation system for wastewater treatment concentrate according to claim 1, characterized in that, The spray gun is a two-fluid atomizing spray gun.

7. The high-temperature flue gas evaporation system for wastewater treatment concentrate according to claim 6, characterized in that, The two-fluid atomizing spray gun includes an outer barrel and an inner barrel; The boiler branch pipe is connected to the inner gun barrel; The compressed air pipe is connected to the outer gun barrel.

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