Automatic liquid discharging system for poisonous and harmful gas
By designing an automatic drainage system for toxic and harmful gases, the problems of induced draft fan overload and condensate not being discharged in time are solved, efficient condensate recovery and unattended operation are achieved, ensuring environmental safety and reducing power consumption and labor intensity.
Patent Information
- Application Number
- CN202422634097.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Large inlet and outlet air volumes of the induced draft fan can easily lead to fan overload. Failure to drain the condensate in time may cause current fluctuations and the escape of toxic and harmful gases, polluting the environment or endangering the safety of workers.
An automatic drainage system for toxic and harmful gases is designed, including an induced draft fan, an exhaust gas absorption tower, inlet and outlet condensers, a gas buffer tank, an automatic drainage device, and a PLC controller. The automatic drainage device can timely recover condensate, reduce fan load, ensure negative pressure, and prevent gas leakage.
It effectively reduces the operating load of the induced draft fan, reduces power consumption, realizes unattended operation, ensures the negative pressure state of the workshop environment, avoids the overflow of toxic gases, improves the condensate recovery efficiency, and reduces labor intensity.
Smart Images
Figure CN223324295U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of toxic and harmful gas treatment, in particular to an automatic liquid discharge system for toxic and harmful gases. Background Art
[0002] Toxic gases from other workshops are sucked and pressurized by the induced draft fan and then sent to the exhaust gas absorption tower. The inlet and outlet will condense to produce waste liquid. If the condensed liquid is not discharged from the fan inlet and outlet in time, it will cause current fluctuations or even overload, which may cause toxic and harmful gases to escape and pollute the atmospheric environment. If the workshop is not well ventilated, toxic and harmful gases may accumulate in the workshop and cause harm to the staff. Utility Model Content
[0003] In order to solve the problem that the current induced draft fan is prone to overload due to large inlet and outlet gas volumes, the utility model provides an automatic drainage system for toxic and harmful gases.
[0004] The utility model is realized by the following technical solutions: an automatic drainage system for toxic and harmful gases, comprising an induced draft fan and an exhaust gas absorption tower, wherein the outlet of the induced draft fan is connected to the exhaust gas absorption tower via a pipeline; the utility model also comprises at least one inlet condenser, wherein the shell sides of adjacent inlet condensers are connected via a pipeline, a gas buffer tank is arranged in series on the pipeline between the inlet condenser at the end and the induced draft fan, and the bottom of the shell side of the inlet condenser is connected to a waste liquid recovery tank via an automatic drainage device and a pipeline;
[0005] The automatic liquid discharge device includes a liquid discharge barrel, an inlet automatic control valve arranged on the inlet pipeline of the liquid discharge barrel, an outlet automatic control valve arranged on the outlet pipeline of the liquid discharge barrel, and a one-way solenoid valve arranged on the liquid discharge barrel. The inlet automatic control valve, outlet automatic control valve and one-way solenoid valve are all electrically connected to the PLC controller.
[0006] As a further improvement of the technical solution of the present utility model, there is an angle between the shell side outlet end of the inlet condenser and the horizontal plane, and the automatic liquid discharge device is arranged at the shell side outlet end of the inlet condenser.
[0007] As a further improvement of the technical solution of the present invention, an automatic liquid draining device is provided on the pipeline between the bottom of the tank body of the gas buffer tank and the waste liquid recovery tank.
[0008] As a further improvement of the technical solution of the present invention, the fan volute of the induced draft fan is connected to the waste liquid recovery tank through an automatic liquid drainage device and a pipeline.
[0009] As a further improvement of the technical solution of the present invention, an outlet condenser is arranged in series between the outlet of the induced draft fan and the exhaust gas absorption tower, the shell side inlet of the outlet condenser and the outlet of the induced draft fan are connected by a pipeline, and the shell side outlet of the outlet condenser is connected to the gas phase inlet of the exhaust gas absorption tower.
[0010] As a further improvement of the technical solution of the present invention, the shell side outlet of the outlet condenser is connected to the gas phase inlet of the waste gas absorption tower through a U-shaped tube, and the U-shaped tube is connected to the waste liquid recovery tank through an automatic drainage device and a pipeline.
[0011] As a further improvement to the technical solution of the present invention, a glass window is provided on the outlet pipeline between the outlet automatic control valve and the liquid drainage barrel.
[0012] As a further improvement of the technical solution of the present utility model, a liquid level sensor is provided on the liquid drainage barrel, and the liquid level sensor is electrically connected to the PLC controller.
[0013] As a further improvement to the technical solution of the present utility model, the inlet pipe of the drainage barrel is higher than the outlet pipe.
[0014] The automatic drainage system for toxic and harmful gases provided by the utility model has the following advantages compared with the prior art:
[0015] The automatic drainage system for toxic and harmful gases described in this utility model cools and recycles a large amount of recyclable condensate in toxic and harmful gases through the inlet and outlet condensers, greatly reducing the inlet and outlet gas volumes of the induced draft fan, lowering the fan operating load, achieving the goal of reducing power consumption and avoiding fan overload. The automatic drainage device allows for unmanned operation, reducing employee labor intensity, and ensuring that toxic gases do not overflow, resulting in zero pollution and zero emissions. The utility model can also empty the condensate in the system in a timely manner through the automatic drainage device, preventing waste liquid from accumulating in the pipeline, ensuring negative pressure at the fan inlet, and ensuring a negative pressure state in the workshop and working environment. At the same time, the gas buffer tank has the function of stabilizing the negative pressure at the induced draft fan inlet. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the description, are used to explain the principles of the present invention.
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0018] Figure 1 This is a structural diagram of the automatic drainage system for toxic and harmful gases described in the present invention.
[0019] In the figure: 1- induced draft fan, 2- exhaust gas absorption tower, 3- inlet condenser, 4- gas buffer tank, 5- waste liquid recovery tank, 6- drain bucket, 7- inlet automatic control valve, 8- outlet automatic control valve, 9- one-way solenoid valve, 10- outlet condenser, 11- glass window. DETAILED DESCRIPTION
[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.
[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0022] The specific embodiments of the present utility model are described in detail below.
[0023] like Figure 1 As shown, the utility model provides a specific embodiment of the automatic drainage system for toxic and harmful gases, comprising an induced draft fan 1 and an exhaust gas absorption tower 2, wherein the outlet of the induced draft fan 1 is connected to the exhaust gas absorption tower 2 via a pipeline, and further comprising two inlet condensers 3, wherein the shell sides of adjacent inlet condensers 3 are connected via pipelines, and a gas buffer tank 4 is provided in series on the pipeline between the inlet condenser 3 located at the end and the induced draft fan 1, and the bottom of the shell side of the inlet condenser 3 is connected to a waste liquid recovery tank 5 via an automatic drainage device and a pipeline;
[0024] The automatic drainage device includes a drainage barrel 6, an inlet automatic control valve 7 arranged on the inlet pipeline of the drainage barrel 6, an outlet automatic control valve 8 arranged on the outlet pipeline of the drainage barrel 6, and a one-way solenoid valve 9 arranged on the drainage barrel 6. The inlet automatic control valve 7, the outlet automatic control valve 8 and the one-way solenoid valve 9 are all electrically connected to the PLC controller.
[0025] During specific implementation, the drainage barrel 6 is provided with a liquid level sensor, which is electrically connected to a PLC controller. In this embodiment, an edited program is input into the PLC controller, and under the control of the PLC controller program, the function of quantitatively discharging the liquid in the drainage barrel 6 can be realized, which is convenient, fast, and highly automated. The specific operating principle of the automatic drainage device is as follows: the inlet automatic control valve 7 is in a normally open state, and condensate from various locations enters the drainage barrel 6 through the corresponding pipeline and the inlet automatic control valve 7. The liquid level sensor transmits the liquid level signal to the PLC controller. When the PLC controller determines that the liquid in the drainage barrel 6 has reached a set liquid level, it controls the inlet automatic control valve 7 to close, the outlet automatic control valve 8 to open, and the one-way solenoid valve 9 to replenish air to the drainage barrel 6. The liquid in the drainage barrel 6 is then recovered into the waste liquid recovery tank 5 through the outlet automatic control valve 8. It should be noted that the set liquid level in the drainage barrel 6 must not exceed 2 / 3 of the effective volume of the drainage barrel 6. When the drain tank 6 is empty, the PLC controller determines that there is no liquid in the drain tank 6 according to the liquid level signal of the liquid level sensor, controls the outlet automatic control valve 8 and the one-way solenoid valve 9 to close, and the inlet automatic control valve 7 to open, and the condensate enters the drain tank 6 again through the pipeline. This process is repeated to complete the recovery of the condensate.
[0026] In order to reduce the inlet and outlet gas volumes of the induced draft fan 1, and also to recover condensate at various locations, this embodiment is provided with automatic drainage devices at various locations, specifically: an automatic drainage device is provided on the pipeline between the bottom of the tank body of the gas buffer tank 4 and the waste liquid recovery tank 5. The fan volute of the induced draft fan 1 is connected to the waste liquid recovery tank 5 through an automatic drainage device and a pipeline. An outlet condenser 10 is provided in series between the outlet of the induced draft fan 1 and the waste gas absorption tower 2, and the shell-side inlet of the outlet condenser 10 is connected to the outlet of the induced draft fan 1 through a pipeline, and the shell-side outlet of the outlet condenser 10 is connected to the gas phase inlet of the waste gas absorption tower 2. The shell-side outlet of the outlet condenser 10 is connected to the gas phase inlet of the waste gas absorption tower 2 through a U-shaped pipe 12, and the U-shaped pipe 12 is connected to the waste liquid recovery tank 5 through an automatic drainage device and a pipeline.
[0027] It should be noted that the drainage barrel 6 in this embodiment is located below the inlet condenser 3, the gas buffer tank 4, the induced draft fan 1 and the U-shaped tube 12, and the waste liquid recovery tank 5 is located below the drainage barrel 6, and the condensate from various locations is recovered by the liquid's own weight.
[0028] The specific working process of this embodiment is as follows: the water-containing and toxic and harmful waste gas at 60±5℃ from the workshop enters the first inlet condenser 3 and the second inlet condenser 3 in turn, and the temperature is reduced to about 30±5℃. The condensate in the shell side of the two inlet condensers 3 is recovered to the waste liquid recovery pool 5 through their respective automatic drainage devices; the gas further passes through the gas buffer tank 4, which can stabilize the pressure of the induced draft fan 1 and avoid the risk of the induced draft fan 1 tripping due to pressure fluctuations. The condensate in the gas buffer tank 4 enters the waste liquid recovery pool 5 through the automatic drainage device, and the gas buffer tank 4 stabilizes the gas. After the pressure is reduced, it is sent into the induced draft fan 1 and pressurized to 90kPa, and the temperature rises to 80±5℃. The condensate in the fan volute enters the waste liquid recovery pool 5 through the corresponding automatic drainage device, avoiding the waste liquid from overflowing from the fan shaft and polluting the on-site environment; the pressurized gas in the induced draft fan 1 is further condensed to 45±5℃ through the outlet condenser 10, reducing the air intake of the exhaust gas absorption tower 2, reducing the load of the exhaust gas absorption tower 2, and improving the exhaust gas absorption effect of the exhaust gas absorption tower 2; and due to the effect of the fluid's own weight flow, the condensate in the U-shaped tube 12 enters the waste liquid recovery pool 5 through the corresponding automatic drainage device.
[0029] To further facilitate the drainage of the condensate in the shell side of the inlet condenser 3, an angle is formed between the shell side outlet of the inlet condenser 3 and the horizontal plane, and the automatic liquid drain device is provided at the shell side outlet of the inlet condenser 3. In this embodiment, the angle is 5°, so that the liquid in the shell side flows to the automatic liquid drain device by the dead weight of the fluid.
[0030] In one embodiment of the present invention, a glass window 11 is provided on the outlet pipe between the outlet automatic control valve 8 and the drain bucket 6. When the staff conducts inspection, they can learn about the condensation effect of the condenser through the glass window 11.
[0031] As shown in the figure, the inlet pipe of the drainage barrel 6 is higher than the outlet pipe. High inlet and low outlet can realize automatic drainage by utilizing the dead weight flow of the fluid.
[0032] Through the implementation of this embodiment, the recovery efficiency of condensate in toxic and harmful gases is increased by 30%, from the original 8m³ per hour to 10.4m³; the total gas volume entering the exhaust gas absorption tower 2 is reduced by 20,000 m³ / h, and the power consumption of the induced draft fan 1 is saved by 50kw per hour.
[0033] The above description is only a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be covered by the scope of protection of the claims.
Claims
1. An automatic drainage system for toxic and harmful gases, comprising an induced draft fan (1) and an exhaust gas absorption tower (2), wherein the outlet of the induced draft fan (1) is connected to the exhaust gas absorption tower (2) via a pipeline, and is characterized in that: It also includes at least one inlet condenser (3), the shell sides of adjacent inlet condensers (3) are connected by pipelines, a gas buffer tank (4) is provided in series on the pipeline between the last inlet condenser (3) and the induced draft fan (1), and the bottom of the shell side of the inlet condenser (3) is connected to the waste liquid recovery tank (5) through an automatic liquid drainage device and a pipeline; The automatic liquid discharge device comprises a liquid discharge barrel (6), an inlet automatic control valve (7) arranged on the inlet pipeline of the liquid discharge barrel (6), an outlet automatic control valve (8) arranged on the outlet pipeline of the liquid discharge barrel (6), and a one-way solenoid valve (9) arranged on the liquid discharge barrel (6). The inlet automatic control valve (7), the outlet automatic control valve (8) and the one-way solenoid valve (9) are all electrically connected to a PLC controller.
2. The automatic drainage system for toxic and harmful gases according to claim 1, characterized in that: There is an angle between the shell-side outlet end of the inlet condenser (3) and the horizontal plane, and the automatic liquid discharge device is arranged at the shell-side outlet end of the inlet condenser (3).
3. The automatic drainage system for toxic and harmful gases according to claim 1, characterized in that: An automatic liquid draining device is provided on the pipeline between the bottom of the gas buffer tank (4) and the waste liquid recovery tank (5).
4. The automatic drainage system for toxic and harmful gases according to claim 1, characterized in that: The fan volute of the induced draft fan (1) is connected to the waste liquid recovery tank (5) via an automatic liquid discharge device and a pipeline.
5. The automatic drainage system for toxic and harmful gases according to claim 1, characterized in that: An outlet condenser (10) is arranged in series between the outlet of the induced draft fan (1) and the exhaust gas absorption tower (2); the shell-side inlet of the outlet condenser (10) and the outlet of the induced draft fan (1) are connected via a pipeline; and the shell-side outlet of the outlet condenser (10) is connected to the gas phase inlet of the exhaust gas absorption tower (2).
6. The automatic drainage system for toxic and harmful gases according to claim 5, characterized in that: The shell-side outlet of the outlet condenser (10) is connected to the gas phase inlet of the waste gas absorption tower (2) via a U-shaped tube (12), and the U-shaped tube (12) is connected to the waste liquid recovery tank (5) via an automatic liquid discharge device and a pipeline.
7. An automatic drainage system for toxic and harmful gases according to any one of claims 1 to 6, characterized in that: A glass window (11) is provided on the outlet pipeline between the outlet automatic control valve (8) and the liquid drain barrel (6).
8. An automatic drainage system for toxic and harmful gases according to any one of claims 1 to 6, characterized in that: The liquid drain barrel (6) is provided with a liquid level sensor, and the liquid level sensor is electrically connected to the PLC controller.
9. An automatic drainage system for toxic and harmful gases according to any one of claims 1 to 6, characterized in that: The inlet pipe of the drainage barrel (6) is higher than the outlet pipe.