Waste gas concentration safety control system

Abstract

The utility model discloses a waste gas concentration safety control system, which belongs to the technical field of safety and environmental protection, and comprises a waste gas discharge header pipe and a concentration detector for detecting the concentration of waste gas in the waste gas discharge header pipe, and the waste gas discharge header pipe is connected with a fresh air inlet pipe and an emergency discharge pipe in parallel. Switch valves are mounted at the outlet ends of the fresh air inlet pipe, the emergency discharge pipe and the waste gas discharge header pipe; the device further comprises a control module, and the concentration detector and the switch valve are electrically connected with the control module. According to the utility model, the detected waste gas concentration is divided into a safety interval, a warning interval and an emergency interval, and different valves are adopted for control according to different intervals, so that the waste gas concentration is monitored and automatically adjusted, and the waste gas concentration is ensured to be stabilized in the safety interval; and the risk of burning explosion of the waste gas incinerator and the waste gas header pipe due to overhigh waste gas concentration is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of safety and environmental protection, and relates to a safety control system for a waste gas incineration process, and specifically to a waste gas concentration safety control system. Background Art

[0002] In terms of organic waste gas treatment technology, the most thorough and efficient treatment technology is incineration technology, that is, the organic waste gas is directly sent to the organic waste gas incinerator for incineration; however, incineration treatment technology has unique safety risks and is only applicable to industrial enterprises with stable waste gas sources (such as petrochemicals, automobile manufacturing, etc.). For factories with intermittent batch production of raw materials, intermediates, etc., short-term high-concentration organic waste gas (up to 10,000 mg / m 3 The high concentration of organic waste gas has a great risk of explosion safety, which makes the treatment of this high concentration of organic waste gas limited in the intermittent feeding production industry such as APIs and intermediates. Therefore, it is urgent to find a suitable safety control system to ensure the stability of the organic waste gas concentration, so that the organic waste gas incineration process can be widely used in this industry to reduce VOCs emissions.

[0003] At present, in actual cases of waste gas incineration, most of the safety control systems on the market use a separate control of the waste gas intake main. For industries such as raw materials and intermediates, or industries with many production workshops and gas production units, the gas production in each workshop may have an instantaneous concentration of extremely high. This will not only increase the concentration in the waste gas main and cause the waste gas incinerator to explode, but there is also the possibility of combustion and explosion of organic combustible waste gas in the waste gas main. Utility Model Content

[0004] The purpose of the utility model is to provide a waste gas concentration safety control system, which divides the detected waste gas concentration into a safety zone, a warning zone, and an emergency zone, and uses different valves to control different zones, thereby monitoring and automatically adjusting the waste gas concentration to ensure that the waste gas concentration is stable in a safe zone, eliminating the risk of explosion in the waste gas incinerator and the waste gas main due to excessive waste gas concentration.

[0005] In order to achieve the purpose of the utility model, the technical solution adopted is: an exhaust gas concentration safety control system, including an exhaust gas emission main pipe, a concentration detector for detecting the exhaust gas concentration in the exhaust gas emission main pipe, and a fresh air intake pipe and an emergency exhaust pipe are connected in parallel to the exhaust gas emission main pipe, and the fresh air intake pipe, the emergency exhaust pipe and the exhaust gas emission main pipe outlet are all installed with switch valves; it also includes a control module, and the concentration detector and the switch valve are electrically connected to the control module.

[0006] Furthermore, a sampling tube is connected in parallel to the exhaust gas emission main pipe, and a concentration detector is installed on the sampling tube.

[0007] Furthermore, a sampling valve is installed on the sampling tube, and the sampling valve is located between the exhaust gas emission main pipe and the concentration detector.

[0008] Furthermore, there are two concentration detectors, one located at the inlet end of the exhaust gas main pipe, and the other located between the fresh air intake pipe and the emergency exhaust pipe.

[0009] Furthermore, a fan is installed on the exhaust gas discharge main pipe.

[0010] Furthermore, the fan is located between the fresh air intake pipe and the emergency discharge pipe.

[0011] Furthermore, the control module is a PLC.

[0012] The beneficial effects of the utility model are:

[0013] In the utility model, the exhaust gas concentration in the exhaust gas main pipe is detected by using a concentration detector, and the exhaust gas concentration range corresponding to different intervals is set in the control module. The control module compares the exhaust gas concentration value detected by the concentration detector with the different intervals preset by the control module, thereby controlling the corresponding switch valve. When the exhaust gas concentration is in the safe range, the exhaust gas is directly sent to the exhaust gas incineration treatment device through the exhaust gas main pipe for incineration; when the exhaust gas concentration is in the warning area, the exhaust gas is sent to the exhaust gas incineration treatment device for incineration while fresh air is sent to the exhaust gas main pipe; when the exhaust gas concentration is in the emergency area, the exhaust gas can be directly discharged through the emergency discharge pipe.

[0014] The utility model can realize automatic monitoring and automatic control of exhaust gas concentration under various working conditions, greatly reducing the risk of combustion and explosion of exhaust gas incinerators due to increased concentration in the exhaust gas emission main pipe and the possibility of combustion and explosion of organic combustible exhaust gas in the exhaust gas emission main pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings illustrate exemplary embodiments of the present invention and are used to explain the principles of the present invention together with the description. These drawings are included to provide a further understanding of the present invention, and the drawings are included in and constitute a part of this specification.

[0016] Figure 1 It is a system diagram of the organic waste gas concentration safety control system provided by the utility model.

[0017] Markings and corresponding parts names in the attached drawings:

[0018] 1. Exhaust emission main pipe, 2. Fresh air intake pipe, 3. Emergency emission pipe, 4. Sampling tube, 5. Fan, 6. Concentration detector I, 7. Concentration detector II, 8. Air supply valve, 9. Emergency valve, 10. Main pipe valve, 11. Sampling valve, 12. Control module. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and implementations. It is to be understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] like Figure 1 As shown, the utility model provides a waste gas concentration safety control system, including a waste gas emission main pipe 1 and a concentration detector. When the waste gas emission main pipe 1 is used to send the waste gas into a waste gas incineration treatment device for incineration treatment, the outlet end of the waste gas emission main pipe 1 is connected to the inlet end of the waste gas incineration treatment device, and the concentration detector is used to detect the waste gas concentration passing through the waste gas emission main pipe 1; the waste gas emission main pipe 1 is connected in parallel with a fresh air intake pipe 2 and an emergency exhaust pipe 3; the fresh air intake pipe 2 is used to replenish air into the waste gas emission main pipe 1, so that the air sent in through the fresh air intake pipe 2 is mixed with the waste gas in the waste gas emission main pipe 1, thereby reducing the waste gas concentration in the waste gas emission main pipe 1; the emergency exhaust pipe 3 is used to directly discharge the waste gas when the waste gas concentration in the waste gas emission main pipe 1 is too high.

[0022] The fresh air intake pipe 2, the emergency discharge pipe 3 and the outlet end of the exhaust gas discharge main pipe 1 are all equipped with switch valves. For the convenience of distinction, the switch valve on the fresh air intake pipe 2 is the air supply valve 8, the switch valve on the emergency discharge pipe 3 is the emergency valve 9, and the switch valve on the outlet end of the exhaust gas discharge main pipe 1 is the main pipe valve 10. The air supply valve 8 is used to control the opening and closing and the opening degree of the fresh air intake pipe 2, the emergency valve 9 is used to control the opening and closing of the emergency discharge pipe 3, and the main pipe valve 10 is used to control the connection and disconnection between the exhaust gas discharge main pipe 1 and the exhaust gas incineration treatment device.

[0023] The exhaust gas concentration safety control system also includes a control module 12, which is a PLC. According to the exhaust gas concentration, the control module 12 is set with intervals corresponding to different exhaust gas concentrations, wherein the exhaust gas concentration is 0%LEL to 18%LEL for the safety interval, 18%LEL to 25%LEL for the warning interval, and 25%LEL to 100%LEL for the emergency interval; at the same time, the output end of the concentration detector is connected to the input end of the control module 12, and the input end of the air supply valve 8, the input end of the emergency valve 9, and the input end of the main pipe valve 10 are all connected to the output end of the control module 12, that is, the concentration detector transmits the detected exhaust gas concentration to the control module 12, and the control module 12 compares the received exhaust gas concentration with the interval values ​​corresponding to the different exhaust gas concentrations preset in the control module 12, and the control module 12 controls the opening and closing of the air supply valve 8, the emergency valve 9, and the main pipe valve 10 according to the comparison result.

[0024] The exhaust gas main pipe 1 is also connected in parallel with a sampling tube 4, the end of the sampling tube 4 away from the exhaust gas main pipe 1 is closed, and the concentration detector is installed on the sampling tube 4, so that the exhaust gas in the exhaust gas main pipe 1 can enter the concentration detector through the sampling tube 4, thereby ensuring that the concentration detector can detect the exhaust gas concentration in the exhaust gas main pipe 1. By using the sampling tube 4 to independently install the exhaust gas detector, the installation of the exhaust gas detector is more convenient, and the exhaust gas main pipe 1 is prevented from being damaged due to the exhaust gas detector being directly installed on the exhaust gas main pipe 1.

[0025] In order to facilitate the installation and replacement of the concentration detector and prevent the exhaust gas from damaging the concentration detector when the concentration detector is not out of use, a sampling valve 11 can also be installed on the sampling tube 4, and the sampling valve 11 is located between the exhaust gas emission main pipe 1 and the concentration detector. By controlling the opening and closing of the sampling valve 11, it is controlled whether the exhaust gas enters the concentration detector.

[0026] In order to make the detection of exhaust gas concentration more accurate, two concentration detectors can be set. For the convenience of distinction, the two concentration detectors are concentration detector Ⅰ6 and concentration detector Ⅱ7. At this time, concentration detector Ⅰ6 is located at the inlet end of the exhaust gas emission main pipe 1, and concentration detector Ⅱ7 is located between the fresh air intake pipe 2 and the emergency exhaust pipe 3. This design is mainly to deal with the situation where the fresh air intake pipe 2 replenishes air into the exhaust gas emission main pipe 1, that is, concentration detector Ⅰ6 is used to detect the original concentration of exhaust gas discharged from the workshop, and concentration detector Ⅱ7 is used to detect the concentration of exhaust gas after mixing with air; in order to make the detection result of concentration detector Ⅱ7 more accurate, concentration detector Ⅱ7 is preferably installed at the outlet end of the fan 5, so that the air replenished through the fresh air intake pipe 2 and the original exhaust gas of the workshop entering the exhaust gas emission main pipe 1 are evenly mixed through the fan 5 before detection.

[0027] In order to facilitate the transportation of exhaust gas, a fan 5 is also installed on the exhaust gas emission main pipe 1. In order to avoid installing an additional fan 5 on the fresh air intake pipe 2, the fan 5 can be installed between the fresh air intake pipe 2 and the emergency exhaust pipe 3. When the fan 5 is running, not only can the exhaust gas in the workshop be directly transported through the exhaust gas emission main pipe 1, but also during the transportation process of the exhaust gas emission main pipe 1 and when the air supply valve 8 is open, according to the pressure difference principle, the air can automatically enter the exhaust gas emission main pipe 1 through the fresh air intake pipe 2 at the same time, so that the air automatically enters the exhaust gas emission main pipe 1 and mixes with the exhaust gas.

[0028] In order to make the detection result of concentration detector Ⅱ7 more accurate, concentration detector Ⅱ7 is preferably installed behind fan 5, so that when the air automatically enters the exhaust gas discharge main pipe 1 through the fresh air intake pipe 2 and mixes with the exhaust gas, the air and the exhaust gas can be further mixed when passing through the fan 5, so that the exhaust gas concentration distribution after being sent out by the fan 5 is more uniform, thereby making the detection result of concentration detector Ⅱ7 more accurate.

[0029] In the specific working process, when the result detected by the concentration detector Ⅰ6 is in the safe range, the air supply valve 8 is closed, the emergency valve 9 is closed, the main valve 10 is opened, and the exhaust gas is sent to the exhaust gas incineration treatment device through the exhaust gas discharge main pipe 1 for incineration treatment;

[0030] When the result detected by the concentration detector II 7 is in the warning range, the opening degree of the air supply valve 8 is adjusted according to the detected exhaust gas concentration exceeding the proportion, the emergency valve 9 is closed, the main valve 10 is opened, and the exhaust gas enters the exhaust gas incineration treatment device through the exhaust gas discharge main pipe 1;

[0031] When the result detected by the concentration detector Ⅱ7 is in the emergency range, the air supply valve 8 is closed, the emergency valve 9 is opened, the main valve 10 is closed, and the exhaust gas is discharged through the emergency discharge pipe 3. The exhaust gas shall not enter the exhaust gas incineration treatment device through the exhaust gas discharge main pipe 1.

[0032] The utility model can be used not only in conjunction with an organic waste gas incinerator, but also in conjunction with other explosive waste gas emission pipelines, that is, the utility model can be used in industries such as bulk drugs and intermediates where the waste gas generation source has large concentration fluctuations.

[0033] The utility model realizes the whole process automatic control, realizes the intrinsic safety of organic waste gas incineration treatment technology, and greatly improves the applicability of organic waste gas incineration technology in fine chemical industries such as raw materials, intermediates, etc.

[0034] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. Exhaust gas concentration safety control system, characterized in that: It includes an exhaust gas emission main pipe, a concentration detector for detecting the exhaust gas concentration in the exhaust gas emission main pipe, and the exhaust gas emission main pipe is connected in parallel with a fresh air intake pipe and an emergency exhaust pipe, and the fresh air intake pipe, the emergency exhaust pipe and the exhaust gas emission main pipe outlet are all installed with switch valves; it also includes a control module, and the concentration detector and the switch valve are electrically connected to the control module.

2. The exhaust gas concentration safety control system according to claim 1, characterized in that: A sampling tube is also connected in parallel to the exhaust gas emission main pipe, and a concentration detector is installed on the sampling tube.

3. The exhaust gas concentration safety control system according to claim 2, characterized in that: A sampling valve is also installed on the sampling tube, and the sampling valve is located between the exhaust gas emission main pipe and the concentration detector.

4. The exhaust gas concentration safety control system according to any one of claims 1 to 3, characterized in that: There are two concentration detectors, one is located at the inlet end of the exhaust gas exhaust main pipe, and the other is located between the fresh air intake pipe and the emergency exhaust pipe.

5. The exhaust gas concentration safety control system according to claim 1, characterized in that: A fan is also installed on the exhaust gas discharge main pipe.

6. The exhaust gas concentration safety control system according to claim 5, characterized in that: The fan is located between the fresh air intake pipe and the emergency discharge pipe.

7. The exhaust gas concentration safety control system according to claim 1, 2, 3, 5 or 6, characterized in that: The control module is a PLC.

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