A gas spraying device

Abstract

The utility model discloses a gas spraying device, include: vacuum buffer tank is used to provide the gas of waiting for processing, the output of vacuum buffer tank is provided with steam ejector, the input of steam ejector still connects steam delivery line, make the gas of waiting for processing and steam form mixed gas, the output of steam ejector still is provided with spray condenser, the output of spray condenser connects tail gas buffer tank, tail gas buffer tank with vacuum buffer tank is connected, makes mixed gas continuous delivery, through design multiple steam ejector and spray condenser who sets alternately in turn, carry out multistage spraying, tail gas buffer tank and vacuum buffer tank connection circulation, almost no tail gas emission, spray condenser and water tank and delivery pump are connected, do not have new waste water generation, reduce environmental pollution, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of chemical synthesis equipment technology, and in particular to a gas spraying device. Background Technology

[0002] Dimethyl phosphite is an organic compound with the chemical formula C2H7O3P. It is commonly used as an additive in lubricating oils, adhesives, and as an intermediate in various organic synthesis processes such as glyphosate. To meet market demands and customer requirements, the quality of dimethyl phosphite needs continuous improvement. However, dimethyl phosphite has a relatively high boiling point. To achieve separation and purification of the material at relatively low temperatures, the boiling point is lowered by reducing the vacuum level. This is typically achieved using a vacuum distillation pump.

[0003] In the current field of chemical production technology, common vacuum distillation devices include reciprocating vacuum pumps, water ring vacuum pumps, and Roots vacuum pumps. However, these pumps generate a large amount of wastewater or waste gas during operation, exhibiting certain drawbacks. For example, water ring vacuum pumps have relatively low efficiency due to significant energy loss during operation, and their vacuum level is limited by the saturated vapor pressure of the working fluid, resulting in high maintenance costs, environmental unfriendliness, and high energy consumption. Roots vacuum pumps, on the other hand, are relatively noisy during operation, and the final vacuum pressure they achieve is generally low, making them unsuitable for high-precision, high-vacuum systems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a gas spraying device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas spraying device, comprising:

[0006] A vacuum buffer tank is used to supply the gas to be processed;

[0007] The vacuum buffer tank is equipped with a steam ejector at its output end.

[0008] The input end of the steam ejector is also connected to a steam delivery pipeline, so that the gas to be treated and the steam form a mixed gas. The output end of the steam ejector is also equipped with a spray condenser.

[0009] The mixed gas, sprayed by the spray condenser, is delivered to the exhaust gas buffer tank, which is connected to the vacuum buffer tank, so that the mixed gas is delivered continuously.

[0010] As a further description of the above technical solution: at least one or more of the steam ejector and the spray condenser are provided, and they are arranged alternately in sequence to perform multi-stage spraying on the mixed gas.

[0011] As a further description of the above technical solution: a water tank is connected below the spray condenser, and a delivery pump is connected to the output end of the water tank.

[0012] As a further description of the above technical solution: the output end of the delivery pump is connected to a heat exchanger, and the output end of the heat exchanger is connected to the top of the spray condenser.

[0013] As a further description of the above technical solution: the steam ejector includes a first cavity and a nozzle, the nozzle is disposed inside the first cavity, and one side of the first cavity is connected to a second cavity, so that the steam and the gas to be treated are mixed in the second cavity to form a mixed gas.

[0014] As a further description of the above technical solution: the steam ejector also includes a third cavity that communicates with the second cavity.

[0015] As a further description of the above technical solution: the inner diameter of the second cavity gradually decreases along the direction of the third cavity, and the inner diameter of the third cavity gradually increases along the direction away from the second cavity.

[0016] As a further description of the above technical solution: the output end of the third cavity is connected to the lower side wall of the spray condenser.

[0017] As a further description of the above technical solution: the lower part of the exhaust gas buffer tank is connected to the water tank through a pipeline.

[0018] As a further description of the above technical solution: the vacuum buffer tank, the steam ejector, the spray condenser, and the exhaust gas buffer tank are all in a negative pressure environment.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] By designing multiple alternating steam ejectors and spray condensers, multi-stage spraying is achieved. The exhaust gas buffer tank is connected to the vacuum buffer tank for circulation, resulting in almost no exhaust gas emissions. The spray condenser is connected to the water tank and the transfer pump, preventing the generation of new wastewater, reducing environmental pollution, and lowering production costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the gas spraying device proposed in this utility model.

[0022] Legend:

[0023] 1. Vacuum buffer tank; 2. Steam ejector; 21. First chamber; 22. Nozzle; 23. Second chamber; 24. Third chamber; 3. Steam delivery pipeline; 4. Spray condenser; 5. Exhaust gas buffer tank; 6. Water tank; 7. Delivery pump; 8. Heat exchanger. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figure 1 The present invention provides an embodiment of a gas spraying device, comprising: a vacuum buffer tank 1 for providing gas to be treated; a steam ejector 2 is provided at the output end of the vacuum buffer tank 1; the input end of the steam ejector 2 is also connected to a steam conveying pipeline 3, so that the gas to be treated and steam form a mixed gas; a spray condenser 4 is also provided at the output end of the steam ejector 2; the mixed gas sprayed by the spray condenser 4 is conveyed to a tail gas buffer tank 5, and the tail gas buffer tank 5 is connected to the vacuum buffer tank 1 to continuously convey the mixed gas.

[0026] In this embodiment, the gas to be treated is dimethyl phosphite (containing dimethyl phosphite, phosphoric acid, chloromethane, and methanol), which is output from the vacuum buffer tank 1. Simultaneously, steam enters the steam ejector 2 through the steam delivery pipeline 3. Inside the steam ejector 2, the gas to be treated mixes with the steam to form a mixed gas. The mixed gas is output from the third chamber 24 of the steam ejector 2 and enters the spray condenser 4. By setting multiple alternating steam ejectors 2 and spray condensers 4, the mixed gas can be subjected to multi-stage spray treatment. The mixed gas after being treated by the spray condenser 4 enters the tail gas buffer tank 5, which is connected to the vacuum buffer tank 1, allowing the mixed gas to be circulated and sprayed. By designing multiple alternating steam ejectors 2 and spray condensers 4 for multi-stage spraying, and with the tail gas buffer tank 5 connected to the vacuum buffer tank 2 for circulation, there is almost no tail gas emission. The spray condenser 4 is connected to a water tank and a delivery pump 7 to collect and circulate the spray water, resulting in no new wastewater generation, reducing environmental pollution, and lowering production costs.

[0027] The steam ejector 2 and the spray condenser 4 are provided in at least one or more, and are arranged alternately in sequence to spray the mixed gas in multiple stages.

[0028] In this embodiment, two steam ejectors 2 and two spray condensers 4 are provided. The steam ejector 2 mixes steam with the gas to be treated, improving the uniformity of the mixed gas. The subsequent spray condenser 4 sprays the mixed gas. By setting them alternately, the number of times and time of contact between the mixed gas and the spray water are increased. When the operating conditions such as the flow rate, composition, and concentration of the mixed gas change, the multi-stage alternating setting can be adapted by adjusting the number of operating stages, the amount of steam and spray water, and other parameters.

[0029] A water tank 6 is connected to the bottom of the spray condenser 4, and the output end of the water tank 6 is connected to a transfer pump 7. The output end of the transfer pump 7 is connected to a heat exchanger 8, and the output end of the heat exchanger 8 is connected to the top of the spray condenser 4.

[0030] In this embodiment, a water tank 6 is connected below the spray condenser 4, and the sprayed water falls into the water tank 6. The delivery pump 7 at the output end of the water tank 6 draws out the water, which is first cooled by the heat exchanger 8, and then sent back to the top of the spray condenser 4 for circulating spraying. The cooling by the heat exchanger 8 can maintain the low temperature of the spray water, enhance the subsequent condensation effect, realize the recycling of the spray water, and avoid the generation of new wastewater.

[0031] The steam ejector 2 includes a first chamber 21 and a nozzle 22. The nozzle 22 is disposed inside the first chamber 21. One side of the first chamber 21 is connected to a second chamber 23, so that steam and the gas to be treated are mixed in the second chamber 23 to form a mixed gas.

[0032] In this embodiment, the nozzle 22 injects steam at high speed into the first chamber 21, creating a local negative pressure zone. Through the Venturi effect, the gas to be treated is drawn from the vacuum buffer tank 1 into the second chamber 23. Meanwhile, the pressure inside the vacuum buffer tank 1 gradually decreases to a negative pressure, thereby drawing the gas to be treated generated in the pretreatment equipment (not shown in the figure) into the vacuum buffer tank 1. The steam and the gas to be treated mix in the second chamber 23. The steam ejector 2 helps maintain the negative pressure environment within the vacuum buffer tank 1, the exhaust gas buffer tank 5, and other equipment.

[0033] The steam ejector 2 also includes a third cavity 24 that communicates with the second cavity 23. The inner diameter of the second cavity 23 gradually decreases along the direction of the third cavity 24, and the inner diameter of the third cavity 24 gradually increases along the direction away from the second cavity 23.

[0034] In this embodiment, the inner diameter of the second cavity 23 gradually decreases, increasing the mixed gas flow rate; the inner diameter of the third cavity 24 gradually increases, decreasing the flow rate but increasing the pressure, promoting full mixing of steam and gas, allowing the mixed gas to flow out from the output end of the steam ejector 2, and improving the mass transfer efficiency through pressure changes.

[0035] The output end of the third chamber 24 is connected to the lower side wall of the spray condenser 4.

[0036] In this embodiment, the mixed gas enters from below the side wall of the spray condenser 4, forming a counter-flow with the cooling water sprayed from the top, which prolongs the contact time between the gas and liquid phases. The air intake from below the side wall can prevent the spray water from directly impacting the air inlet and prevent liquid backflow into the steam ejector 2 due to excessive spray volume. The multi-stage steam ejector 2 and spray condenser 4 are set up. The air intake design below the side wall of the front spray condenser 4 can be linked with the suction action of the next stage steam ejector.

[0037] The exhaust gas buffer tank 5 is connected to the water tank 6 via a pipeline.

[0038] In this embodiment, the water vapor that is not completely condensed by the spray condenser 4 is further condensed in the exhaust gas buffer tank 5, and then flows into the water tank 6 through the pipeline, where it can be mixed with the spray water and recycled.

[0039] The vacuum buffer tank 1, steam ejector 2, spray condenser 4, and exhaust gas buffer tank 5 are all in a negative pressure environment.

[0040] In this embodiment, under negative pressure conditions, the water vapor contained in the gas is more easily condensed, which improves the removal efficiency. Negative pressure operation can reduce the resistance of the mixed gas in the device and avoid the decrease in processing efficiency or damage to the device caused by gas resistance.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas spraying device, characterized in that, include: A vacuum buffer tank (1) is used to supply the gas to be processed; The vacuum buffer tank (1) is equipped with a steam ejector (2) at its output end; The input end of the steam ejector (2) is also connected to a steam delivery pipeline (3) so that the gas to be treated and the steam form a mixed gas. The output end of the steam ejector (2) is also equipped with a spray condenser (4). The mixed gas sprayed by the spray condenser (4) is transported to the tail gas buffer tank (5), which is connected to the vacuum buffer tank (1) to ensure continuous transport of the mixed gas.

2. The gas spraying device according to claim 1, characterized in that: The steam ejector (2) and the spray condenser (4) are provided in at least one or more, and are arranged alternately in sequence to spray the mixed gas in multiple stages.

3. The gas spraying device according to claim 1, characterized in that: The spray condenser (4) is connected to a water tank (6) below, and the output end of the water tank (6) is connected to a delivery pump (7).

4. The gas spraying device according to claim 3, characterized in that: The output end of the delivery pump (7) is connected to the heat exchanger (8), and the output end of the heat exchanger (8) is connected to the top of the spray condenser (4).

5. The gas spraying device according to claim 1, characterized in that: The steam ejector (2) includes a first cavity (21) and a nozzle (22). The nozzle (22) is disposed inside the first cavity (21). One side of the first cavity (21) is connected to a second cavity (23) so that the steam and the gas to be treated are mixed in the second cavity (23) to form a mixed gas.

6. The gas spraying device according to claim 5, characterized in that: The steam ejector (2) also includes a third cavity (24) that communicates with the second cavity (23).

7. The gas spraying device according to claim 6, characterized in that: The inner diameter of the second cavity (23) gradually decreases along the direction of the third cavity (24), and the inner diameter of the third cavity (24) gradually increases along the direction away from the second cavity (23).

8. The gas spraying device according to claim 6, characterized in that: The output end of the third cavity (24) is connected to the lower side wall of the spray condenser (4).

9. The gas spraying device according to claim 3, characterized in that: The exhaust gas buffer tank (5) is connected to the water tank (6) via a pipeline.

10. The gas spraying device according to claim 1, characterized in that: The vacuum buffer tank (1), the steam ejector (2), the spray condenser (4), and the exhaust gas buffer tank (5) are all in a negative pressure environment.

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