Diesel engine flue gas temperature control eliminating system

Abstract

The utility model provides a diesel engine flue gas temperature control elimination system, which comprises a diesel engine and a heat extraction cooling tower, the diesel engine is connected with a flue gas spray tower through a flue gas channel, a spray water path is arranged between a liquid outlet of the flue gas spray tower and a spray pipe, a flue gas outlet is arranged on the flue gas spray tower, and the heat extraction cooling tower is connected with the diesel engine. A cooling water way is arranged between a liquid outlet and a liquid return opening of the heat extraction cooling tower, a first heat exchanger exchanging heat with the smoke channel and a second heat exchanger exchanging heat with the spraying water way are installed on the cooling water way, and the heat extraction cooling tower is connected with an external water source through a water supplementing pipe. Smoke abatement and temperature control treatment is carried out on diesel engine smoke through low-temperature cooling water prepared by the heat extraction cooling tower and the smoke spraying tower, the basic temperature of the low-temperature cooling water is the temperature of an external water source, and the temperature difference between the treated smoke and the external environment is reduced; the problems that the external environment is affected and the position of the smoke outlet is exposed due to the fact that the smoke outlet discharges white smoke are avoided.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine flue gas treatment technology, and in particular to a diesel engine flue gas temperature control and elimination system. Background Technology

[0002] Underground engineering projects typically require concealed ventilation. Diesel generators, as crucial power supply equipment in underground projects, generate large amounts of high-temperature flue gas and heat that must be emitted. Treating this flue gas for smoke suppression and temperature control presents a significant technical challenge. Currently, a common method is to use internally stored water for spraying to suppress smoke and lower temperatures. However, while the internal water temperature is generally stable throughout the year, resulting in a stable flue gas temperature, the temperature difference between the treated flue gas and the external environment increases when external temperatures fluctuate, especially during the cold winter months. This not only fails to meet temperature emission requirements but may also produce "white smoke" at the exhaust outlet, impacting the external environment and exposing the location of the exhaust vent. Furthermore, directly using internal water for spraying results in enormous cooling water consumption, leading to high construction and operating costs. Utility Model Content

[0003] The purpose of this invention is to provide a diesel engine flue gas temperature control and elimination system to solve the above-mentioned technical problems.

[0004] This utility model provides a diesel engine flue gas temperature control and elimination system, including a diesel engine and a heat exhaust cooling tower. The diesel engine is connected to a flue gas spray tower through a flue gas passage. A spray water path is provided between the drain port of the flue gas spray tower and the spray pipe. A flue gas exhaust port is installed on the flue gas spray tower. A cooling water path is provided between the outlet and return port of the heat exhaust cooling tower. A first heat exchanger that exchanges heat with the flue gas passage and a second heat exchanger that exchanges heat with the spray water path are installed on the cooling water path. The heat exhaust cooling tower is connected to an external water source through a water supply pipe.

[0005] Furthermore, the first heat exchanger is a flue gas-water shell-and-tube heat exchanger, the cooling water inlet of the first heat exchanger is connected to the cooling water outlet of the second heat exchanger, and the cooling water outlet of the first heat exchanger is connected to the return port of the exhaust cooling tower.

[0006] Furthermore, the second heat exchanger is a water-to-water plate heat exchanger, the cooling water inlet of the second heat exchanger is connected to the liquid outlet of the exhaust cooling tower, and the cooling water outlet of the second heat exchanger is connected to the cooling water inlet of the first heat exchanger.

[0007] Furthermore, the heat dissipation cooling tower is provided with an air inlet and an air outlet.

[0008] Furthermore, the external water source is surface water, groundwater, or municipal water.

[0009] Furthermore, it also includes a PLC control cabinet, wherein the water supply pipe, the cooling water circuit, and the spray water circuit are respectively equipped with pumps, valves, and sensors that are electrically connected to the PLC control cabinet.

[0010] Furthermore, a pH meter electrically connected to the PLC controller is installed near the drain outlet of the flue gas spray tower on the spray water line.

[0011] Furthermore, the spray water path of the pH meter, which is far from the drain outlet of the flue gas spray tower, is connected to a dosing device via a dosing pipe. The dosing pipe is equipped with a pump, valve, and sensor that are electrically connected to the PLC control cabinet.

[0012] Furthermore, the dosing device contains an alkaline solution.

[0013] Furthermore, an overflow pipe is provided near the bottom of the flue gas spray tower.

[0014] This invention uses a heat dissipation cooling tower to prepare low-temperature cooling water and a flue gas spray tower to treat diesel engine flue gas for smoke elimination and temperature control. The base temperature of the low-temperature cooling water is the temperature of the external water source, which reduces the temperature difference between the treated flue gas and the external environment, and avoids the problem of white smoke emitted from the exhaust port affecting the external environment and exposing the location of the exhaust port. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the system flow of this utility model;

[0017] Explanation of reference numerals in the attached figures:

[0018] In the diagram: 1-Diesel engine, 2-Flue gas passage, 3-Flue gas spray tower, 31-Exhaust outlet, 32-Spray water circuit, 33-pH meter, 34-Dosing pipeline, 35-Dosing device, 36-Overflow pipe, 4-Heat exhaust cooling tower, 41-Make-up water pipe, 42-Cooling water circuit, 43-Air inlet, 44-Air outlet, 5-First heat exchanger, 6-Second heat exchanger, 71-Make-up water pump, 72-Cooling water circulation pump, 73-Spray water circulation pump, 74-Dosing pump, 81-Make-up water valve, 82-Cooling water valve, 83-Spray water valve, 84-Dosing valve; Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1

[0023] like Figure 1 As shown:

[0024] A diesel engine flue gas temperature control and elimination system includes a diesel engine 1, a heat exhaust cooling tower 4, and a PLC control cabinet. The diesel engine 1 is connected to a flue gas spray tower 3 through a flue gas passage 2. A spray water passage 32 is provided between the drain port and the spray pipe of the flue gas spray tower 3. A cooling water passage 42 is provided between the outlet and return port of the heat exhaust cooling tower 4. A first heat exchanger 5 and a second heat exchanger 6 are installed on the cooling water passage 42. The heat exhaust cooling tower 4 is connected to an external water source.

[0025] The exhaust port of the diesel engine 1 is connected to the inlet of the flue gas spray tower 3 through the flue gas passage 2. The flue gas spray tower 3 is equipped with an exhaust port 31 for discharging the treated flue gas.

[0026] An overflow pipe 36 is installed near the bottom of the flue gas spray tower 3. When the liquid level in the flue gas spray tower 3 reaches a certain height, the water in the flue gas spray tower 3 can be discharged through the overflow pipe 36 to avoid the water level in the flue gas spray tower 3 being too high and affecting the smoke elimination effect.

[0027] The heat dissipation cooling tower 4 is connected to an external water source through a water supply pipe 41. The external water source is surface water, groundwater, or municipal water with a water temperature of 10-20℃.

[0028] A water supply pump 71 and a water supply valve 81 are installed on the water supply pipe 41, and the water supply pump 71 and the water supply valve 81 are electrically connected to the PLC control cabinet. In this embodiment, the water supply operation can be started at a time by the PLC controller.

[0029] Preferably, a level gauge electrically connected to a PLC controller is installed inside the heat dissipation cooling tower 4. The PLC controller controls the opening of the water supply pump 71 and the water supply valve 81 through the level data provided by the level gauge, so as to introduce water from an external water source into the heat dissipation cooling tower 4.

[0030] The heat dissipation cooling tower 4 is equipped with an air inlet 43 and an air outlet 44. Outdoor fresh air enters through the air inlet 43 of the heat dissipation cooling tower 4 and is discharged outside the project through the air outlet 44 of the heat dissipation cooling tower 4.

[0031] The first heat exchanger 5 is a flue gas-water shell-and-tube heat exchanger. The cooling water inlet of the first heat exchanger 5 is connected to the cooling water outlet of the second heat exchanger 6, and the cooling water outlet of the first heat exchanger 5 is connected to the return port of the exhaust cooling tower 4.

[0032] The second heat exchanger 6 is a water-to-water plate heat exchanger. The cooling water inlet of the second heat exchanger 6 is connected to the liquid outlet of the exhaust cooling tower 4, and the cooling water outlet of the second heat exchanger 6 is connected to the cooling water inlet of the first heat exchanger 5.

[0033] The cooling water circuit 42 is equipped with a cooling water circulation pump 72 and a cooling water valve 82 that are electrically connected to the PLC controller; the spray water circuit 32 is equipped with a spray water circulation pump 73 and a spray water valve 83 that are electrically connected to the PLC controller.

[0034] A pH meter 33, which is electrically connected to the PLC controller, is installed on the spray water path 32 near the drain port of the flue gas spray tower 3.

[0035] The pH meter 33 is located away from the drain outlet of the flue gas spray tower 3. The spray water path 32 is connected to the dosing device 35 through the dosing pipeline 34. The dosing pipeline 34 is equipped with a dosing pump 74 and a dosing valve 84 that are electrically connected to the PLC control cabinet.

[0036] In this embodiment, the dosing device 35 contains a mixed alkaline solution of sodium hydroxide, calcium hydroxide, ammonia, sodium hypochlorite, and a transition metal catalyst.

[0037] The PLC control cabinet controls the opening and closing of the dosing pump 74 and the dosing valve 84 based on the data fed back from the pH meter 33, thereby achieving the purpose of dosing control.

[0038] pH meter 33 monitors the pH value of the spray water at the drain outlet of flue gas spray tower 3 in real time. When the pH value drops to the specified range, the dosing process is started. The dosing device 35 adds alkaline solution to the spray water path 32 through the dosing pump 74 until the pH value of the spray water monitored by pH meter 33 meets the requirements.

[0039] The water supply pipe 41, cooling water circuit 42 and spray water circuit 32 are respectively equipped with sensors that are electrically connected to the PLC control cabinet. In this embodiment, the sensors are pressure and temperature sensors.

[0040] The water supply pump 71, cooling water circulation pump 72, spray water circulation pump 73, and dosing pump 74 are used to drive the flow of the medium in the pipeline and provide power for the medium in the pipeline. The water supply valve 81, cooling water valve 82, spray water valve 83, and dosing valve 84 are used to control the opening and closing of the pipeline and to regulate the flow rate of the medium in the pipeline. The sensor is used to detect the pressure and temperature of the medium in the pipeline and output the pressure data and temperature data of the medium in each pipeline to the PLC control cabinet.

[0041] The high-temperature flue gas (310-330℃) generated by diesel engine 1 enters the flue gas passage 2. The first heat exchanger 5 performs preliminary cooling on the flue gas discharged from diesel engine 1 in the flue gas passage 2, and the flue gas is cooled to medium-temperature flue gas (40-50℃). The medium-temperature flue gas enters the flue gas spray tower 3. The spray water path 32 performs heat exchange and cooling through the second heat exchanger 6. The flue gas spray tower 3 performs secondary cooling and flue gas spraying and elimination work on the flue gas. The particles in the flue gas are purified by spraying, and the flue gas temperature is finally reduced to 15-40℃ (lower temperature in winter and higher temperature in summer). The flue gas is discharged into the external ambient air through the exhaust port 31 of the flue gas spray tower 3. The high-temperature flue gas generated by diesel engine 1 has completed the temperature control and elimination treatment.

[0042] The exhaust cooling tower 4 prepares cooling water at 5-30℃ (lower in winter, higher in summer) according to the different wet-bulb temperatures of the outdoor fresh air. Driven by the cooling water circulation pump 72, the cooling water in the exhaust cooling tower 4 enters the cooling water path 42 through the liquid outlet and flows into the second heat exchanger 6. After the second heat exchanger 6 exchanges heat and cools the spray water path 32 of the flue gas spray tower 3, the temperature rises to 14-39℃. The medium in the spray water path 32 at the bottom of the flue gas spray tower 3 is cooled to 6-31℃. The medium in the spray water path 32 is lifted by the spray water circulation pump 73 to the spray pipe at the top of the flue gas spray tower 3 for flue gas spraying. The cooling water flowing out of the second heat exchanger 6 is transported to the first heat exchanger 5. The first heat exchanger 5 cools the high-temperature flue gas output by the diesel engine 1 in the flue gas passage 2, and the water temperature is further increased to 25-50℃. Finally, it enters the exhaust cooling tower 4 through the liquid return port for evaporation and cooling down to 5-30℃. The water system then completes a heating and cooling cycle.

[0043] The PLC controller inside the control cabinet senses the fluctuations in cooling water temperature caused by changes in the operating power of diesel engine 1 or the inlet air temperature of exhaust cooling tower 4 in real time based on pressure and temperature sensors. It further improves the operating efficiency of the system and controls the final treatment temperature of flue gas by adjusting the water volume of the cooling water system.

[0044] Because the flue gas has high humidity and high water content, the flue gas spray tower 3 will not only not consume water during operation, but will also continuously condense water and discharge it through the overflow pipe 36.

[0045] The water consumption of this system is only 1% of that of the exhaust cooling tower 4, which is about 1% of its circulating water volume. The system has excellent water-saving performance.

[0046] This invention utilizes a low-temperature cooling water prepared by a heat dissipation cooling tower and a flue gas spray tower to treat diesel engine exhaust gas for smoke elimination and temperature control. The base temperature of the low-temperature cooling water is the external water source temperature. When the external air temperature is high, the prepared cooling water temperature is high, and the final treated exhaust gas temperature is also high. Conversely, when the external air temperature is low, the prepared cooling water temperature is low, and the final treated exhaust gas temperature is also low. This reduces the temperature difference between the treated exhaust gas and the external environment, ensuring that the temperature difference remains within the required range. This avoids white smoke emissions from the exhaust outlet that could affect the external environment and expose the exhaust outlet location. The system's water consumption is only the evaporation rate of the heat dissipation cooling tower, resulting in minimal cooling water consumption and significantly reducing construction investment and operating costs.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A diesel exhaust gas temperature controlled abatement system characterized by The device comprises a diesel engine and a heat exhaust cooling tower, the diesel engine is connected with a flue gas spray tower through a flue gas channel, a spray water channel is arranged between a liquid outlet and a spray pipe of the flue gas spray tower, a flue gas outlet is arranged on the flue gas spray tower, a cooling water channel is arranged between a liquid outlet and a liquid return outlet of the heat exhaust cooling tower, a first heat exchanger for heat exchange with the flue gas channel and a second heat exchanger for heat exchange with the spray water channel are arranged on the cooling water channel, and the heat exhaust cooling tower is connected with an external water source through a water supplement pipe.

2. The diesel exhaust temperature controlled abatement system of claim 1, wherein, The first heat exchanger is a flue gas-water tube shell heat exchanger, a cooling water inlet of the first heat exchanger is connected with a cooling water outlet of the second heat exchanger, and a cooling water outlet of the first heat exchanger is connected with the liquid return outlet of the heat exhaust cooling tower.

3. The diesel exhaust temperature controlled abatement system of claim 1, wherein, The second heat exchanger is a water-water plate heat exchanger, a cooling water inlet of the second heat exchanger is connected with the liquid outlet of the heat exhaust cooling tower, and a cooling water outlet of the second heat exchanger is connected with the cooling water inlet of the first heat exchanger.

4. The diesel exhaust temperature controlled abatement system of claim 1, wherein, An air inlet and an air outlet are arranged on the heat exhaust cooling tower.

5. The diesel exhaust temperature controlled abatement system of claim 1, wherein, The external water source is surface water, underground water or municipal water.

6. The diesel exhaust temperature controlled abatement system of claim 1, wherein, A PLC control cabinet is further arranged, and pump bodies, valves and sensors electrically connected with the PLC control cabinet are arranged on the water supplement pipe, the cooling water channel and the spray water channel.

7. The diesel exhaust temperature controlled abatement system of claim 6, wherein, A PH meter electrically connected with the PLC controller is arranged on the spray water channel close to the liquid outlet of the flue gas spray tower.

8. The diesel exhaust temperature controlled abatement system of claim 7, wherein, A dosing device is connected with the spray water channel away from the liquid outlet of the flue gas spray tower through a dosing pipeline, and pump bodies, valves and sensors electrically connected with the PLC control cabinet are arranged on the dosing pipeline.

9. The diesel exhaust temperature controlled abatement system of claim 8, wherein, An alkali solution is placed in the dosing device.

10. The diesel exhaust temperature controlled abatement system of claim 1, wherein, An overflow pipe is arranged on the flue gas spray tower close to the bottom.

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