Waste gas treatment control system

Abstract

The utility model discloses a waste gas treatment control system which comprises a main exhaust pipeline, a main collecting fan and a main exhaust pipeline, the waste gas exhaust pipeline is connected with the main exhaust pipeline and arranged at the tail end of the main exhaust pipeline, and a waste gas collecting fan is connected in the waste gas exhaust pipeline; and the bypass air pipeline is connected with the main exhaust pipeline and used for bypassing air to the main exhaust pipeline, and a bypass electric valve is connected to the bypass air pipeline. According to the waste gas treatment control system, the waste gas treatment system can operate stably, and the heating risk of the draught fan is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic control, in particular to an exhaust gas treatment control system. Background Art

[0002] At present, there are many types of waste gas in laboratories. The commonly used waste gas treatment and collection measures are: use different fans to collect waste gas of similar types, the same department, and similar opening time to the roof, and then discharge it to the high altitude through the main summary fan after the waste gas treatment that meets the environmental impact assessment requirements is summarized. When collecting waste gas, the waste gas is first collected by the waste gas collecting fan at the end, and then the collected waste gas is merged into the main summary fan. However, due to the influence of the number of fans that collect waste gas at the end, the air volume collected by the main summary fan is also inconsistent. When there are few fans that collect waste gas at the end, the amount of waste gas collected to be discharged is too small. Due to the large air volume of the main summary fan, when a small amount of waste gas is discharged, the operating frequency of the main summary fan is lower than the minimum operating frequency of the main summary fan variable frequency (generally set to 25HZ~50HZ). The main summary fan operates at a state below the minimum operating frequency, which will increase the risk of heating of the main summary fan and affect the service life of the main summary fan. Utility Model Content

[0003] In order to overcome the defects in the prior art, the embodiment of the utility model provides an exhaust gas treatment control system, which can make the exhaust gas treatment system run smoothly and reduce the risk of fan heating.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The utility model discloses an exhaust gas treatment control system, comprising:

[0006] A main exhaust duct, wherein an exhaust gas treatment device and a main exhaust fan are connected to the main exhaust duct;

[0007] An exhaust gas exhaust pipe, which is connected to the main exhaust pipe and is arranged at the end of the main exhaust pipe, and an exhaust gas collecting fan is connected to the exhaust gas exhaust pipe;

[0008] A bypass air duct is connected to the main exhaust duct for bypassing the exhaust gas to the main exhaust duct. A bypass electric valve is connected to the bypass air duct.

[0009] The above technical solution adds a bypass air duct and a bypass electric valve in the exhaust gas treatment control system. When the amount of exhaust gas entering the main summing fan is small, the added bypass air duct can be ventilated, so that the main summing fan can operate at a frequency higher than the minimum operating frequency, which can reduce the risk of fan overheating.

[0010] Preferably, the air inlet end of the main collecting fan is connected to the air outlet end of the exhaust gas treatment device, the air inlet end of the exhaust gas treatment device is connected to the main exhaust duct, and the air inlet end of the main exhaust duct is connected to the air outlet end of the exhaust gas exhaust duct and the air outlet end of the bypass duct.

[0011] Preferably, the main summing fan is preset with a minimum operating frequency, and the bypass electric valve can be in an open or closed state according to the minimum operating frequency of the main summing fan, wherein:

[0012] When the frequency conversion of the main and summing fans is lower than the minimum operating frequency, the bypass electric valve opens;

[0013] When the frequency conversion of the main and summing fans is greater than or equal to the minimum operating frequency, the bypass electric valve is closed.

[0014] The bypass duct does not affect the exhaust gas transport by the exhaust gas exhaust duct, and the bypass duct is only used when the frequency conversion of the main summary fan is lower than the minimum operating frequency.

[0015] Preferably, the bypass electric valve is an electric on / off sealed valve, and the electric on / off sealed valve is used to automatically control the opening and closing of the bypass air duct.

[0016] Preferably, the bypass air duct pipe and the exhaust gas exhaust pipe are both branch pipes connected to the main exhaust pipe, and the exhaust and ventilation between the bypass air duct pipe and the exhaust gas exhaust pipe do not affect each other.

[0017] The branch pipe connected to the main exhaust duct is used to transport exhaust gas and ventilation to the main exhaust duct. The opening and closing of the exhaust duct and the bypass ventilation duct are selected according to the actual exhaust gas emission requirements and the operating frequency of the main summing fan.

[0018] Preferably, the main exhaust duct is connected to a plurality of exhaust ducts, the exhaust of the plurality of exhaust ducts does not affect each other, and any exhaust duct is connected to an exhaust gas collecting fan.

[0019] There are multiple rooms in the laboratory, and multiple exhaust gas collection fans are placed in the multiple rooms. The opening and closing of the multiple exhaust gas collection fans do not affect each other.

[0020] Preferably, an electric valve is connected to any one of the exhaust gas exhaust pipes, and the electric valve is an electric switch closed valve, and the electric switch closed valve is used to automatically control the opening and closing of the exhaust gas collection fan.

[0021] Preferably, the main exhaust pipe is connected with a main electric valve, which is an electric switch closed valve used to automatically control the opening and closing of the main collecting fan, wherein:

[0022] When the electric valve on any exhaust gas exhaust pipe is opened, the corresponding exhaust gas collection fan is turned on, the main electric valve is opened, and the main collection fan is turned on;

[0023] When the electric valves on all exhaust gas exhaust pipes are closed, all corresponding exhaust gas collection fans are closed, the main electric valve is closed, and the main collection fan is closed.

[0024] As long as one exhaust gas collection fan is working, the main summarizing fan will work. When all exhaust gas collection fans are turned off, the main summarizing fan will also be turned off and will not work.

[0025] Preferably, the main summing fan is a variable frequency fan, and a frequency converter is provided inside the main summing fan, and the frequency converter performs variable frequency control on the main summing fan.

[0026] The main and sub-fans are operated at a variable frequency according to the static pressure of the duct. The frequency converter controls the operating frequency of the main and sub-fans according to the static pressure of the duct to discharge the exhaust gas outside the house.

[0027] Preferably, the exhaust gas treatment control system further comprises a controller, which is connected to the main electric valve, the electric valve and the bypass electric valve and is used to automatically control the opening and closing of the main electric valve, the electric valve and the bypass electric valve.

[0028] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0029] 1. By setting up a bypass air duct, the present application can enable the main collecting fan to operate at a variable frequency higher than the minimum operating frequency when the amount of exhaust gas discharged after treatment is small, thereby avoiding affecting the service life of the fan and ensuring the smooth operation of the entire exhaust gas treatment system.

[0030] 2. This application can reduce the risk of fan heating when the fan is working and extend the service life of the fan by setting up a bypass air duct.

[0031] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of the structure of an exhaust gas treatment control system of the utility model;

[0034] Figure 2 The utility model is a control principle diagram of an exhaust gas treatment control system.

[0035] The figure marks of the above drawings are: 1. main exhaust duct; 2. exhaust gas exhaust duct; 3. bypass air duct; 4. exhaust gas treatment device; 5. main collecting fan; 6. exhaust gas collecting fan; 7. main electric valve; 8. electric valve; 9. bypass electric valve; 10. controller. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In addition, the drawings of the utility model are only simple schematic illustrations and are not depicted according to actual sizes. Please note in advance.

[0037] In the present utility model, it should be noted that the terms "upper", "lower", "inside", "outside", "forward", "backward", "between", "close to", "far away" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. It should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0038] It should be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

[0039] See also Figure 1 As shown, the present application embodiment provides a schematic diagram of the structure of an exhaust gas treatment control system. Figure 1 As shown, an exhaust gas treatment control system includes a main exhaust pipe 1, an exhaust gas exhaust pipe 2 and a bypass air duct pipe 3, and the main exhaust pipe 1 is connected to the exhaust gas exhaust pipe 2 and the bypass air duct pipe 3.

[0040] By means of the above structure, the present application sets a bypass air duct 3 in the exhaust gas treatment control system, so that the main summary fan 5 can operate at a frequency higher than the minimum operating frequency of the main summary fan 5 when the exhaust gas emission after treatment is small. The entire exhaust gas treatment system runs smoothly, which can reduce the risk of fan heating when the fan is working and extend the service life of the fan.

[0041] See also Figure 1 The main exhaust pipe 1 is connected with an exhaust gas treatment device 4 and a main collection fan 5. The air inlet end of the exhaust gas treatment device 4 is connected to the main exhaust pipe 1, which is used to treat the collected exhaust gas and convert the exhaust gas into gas that meets the emission standards. The air inlet end of the main collection fan 5 is connected to the exhaust gas outlet end of the exhaust gas treatment device 4, which is used to discharge the treated exhaust gas to the outside. The main exhaust pipe 1 is provided with a main electric valve 7, which is an electric switch closed valve, which is used to automatically control the opening and closing of the main collection fan 5.

[0042] A plurality of exhaust gas pipes 2 are connected to the main exhaust pipe 1. The exhaust gas pipe 2 is an exhaust branch pipe connected to the main exhaust pipe 1 and is arranged at the end of the main exhaust pipe 1. The air inlet end of the main exhaust pipe 1 is connected to the air outlet end of the exhaust gas pipe 2. The plurality of exhaust gas pipes 2 are used to transport the exhaust gas in the plurality of rooms to the main exhaust pipe 1. The exhaust gas transport between the plurality of exhaust gas pipes 2 does not affect each other. An exhaust gas collecting fan 6 is connected to the exhaust gas exhaust pipe 2. The exhaust gas collecting fan 6 is used to collect the exhaust gas discharged indoors. The air inlet end of the exhaust gas collecting fan 6 is connected to the room and used to collect the exhaust gas. The air outlet end of the exhaust gas collecting fan 6 is connected to the exhaust gas pipe 2 and used to transport the collected exhaust gas to the main exhaust pipe 1 through the exhaust gas pipe 2. The exhaust gas is then transported to the exhaust gas treatment device 4 by the main exhaust pipe 1. The exhaust gas treated by the exhaust gas treatment device 4 is merged into the main aggregation fan 5, and the main aggregation fan 5 then discharges the exhaust gas to the outside. The exhaust gas collecting fans 6 are placed in different rooms. The exhaust gas collecting fans 6 can be turned on individually, or multiple exhaust gas collecting fans 6 can be turned on and work at the same time.

[0043] The exhaust gas collection fan 6 is provided with an electric valve 8 corresponding to the exhaust gas collection fan 6, which is used to automatically open and close the exhaust gas collection fan 6 and control the operation of the exhaust gas collection fan 6. In the exhaust gas treatment control system, if any exhaust gas collection fan 6 is turned on, the main summary fan 5 is turned on, and the entire exhaust gas treatment system is in working state; if all exhaust gas collection fans 6 are turned off, the main summary fan 5 is turned off, and the entire exhaust gas treatment control system is not working.

[0044] A bypass air duct pipe 3 is connected to the main exhaust pipe 1. The bypass air duct pipe 3 is a ventilation branch pipe connected to the main exhaust pipe 1. The bypass air duct pipe 3 is used for bypass ventilation to the main exhaust pipe 1. A bypass electric valve 9 is provided on the bypass air duct pipe 3. The bypass electric valve 9 is an electric switch closed valve. The bypass electric valve 9 is used to automatically open and close the bypass air duct pipe 3.

[0045] The main summary fan 5 is a variable frequency fan, and a frequency converter is provided inside the main summary fan 5. The main summary fan 5 is preset with a minimum operating frequency, and the minimum operating frequency is the frequency at which the main summary fan 5 is overloaded, causing the fan to easily heat up and damage the life of the fan. When the number of exhaust gas collection fans 6 turned on is small, the amount of exhaust gas collected is small, and the amount of exhaust gas transported to the main summary fan 5 is small, the operating frequency of the main summary fan 5 is lower than the minimum operating frequency. At this time, the main summary fan 5 has a large workload and is prone to heat up. The bypass air duct 3 can ensure that the main summary fan 5 runs at a frequency higher than the minimum operating frequency when the number of exhaust gas collection fans 6 turned on is small and the amount of exhaust gas collected is small, thereby avoiding damage to the life of the main summary fan 5.

[0046] The entire exhaust gas treatment control system also includes a controller 10, such as Figure 2 In the illustrated embodiment, the controller 10 is electrically connected to the main electric valve 7, the electric valve 8 and the bypass electric valve 9, and is used to automatically control the opening and closing of the main electric valve 7, the electric valve 8 and the bypass electric valve 9. The controller 10 is also electrically connected to the frequency converter in the main summary fan 5, and is used to control the frequency converter to change the frequency of the main summary fan 5. The frequency converter can operate with frequency conversion according to the static pressure of the air duct, and can transmit the operating frequency of the main summary fan 5 to the controller 10. The controller 10 controls the opening and closing of the bypass electric valve 9 according to the operating frequency of the main summary fan 5.

[0047] The working principle of the entire exhaust gas treatment system is: when the exhaust gas treatment system starts to work, the bypass electric valve 9 is in a closed state. When there are fewer exhaust gas collection fans 6 turned on, the amount of collected exhaust gas is small, and the frequency conversion frequency of the main collecting fan 5 is less than the minimum operating frequency, the bypass electric valve 9 automatically opens, and the bypass air duct 3 bypasses the air to the main exhaust duct 1, and the frequency of the main collecting fan 5 becomes higher than the minimum operating frequency, and the main collecting fan 5 reduces heat generation. When there are more exhaust gas collection fans 6 turned on, the amount of collected exhaust gas is large, the frequency conversion frequency of the main collecting fan 5 is greater than the minimum operating frequency, and the bypass electric valve 9 remains closed.

[0048] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An exhaust gas treatment control system, characterized in that: include: A main exhaust duct, wherein an exhaust gas treatment device and a main exhaust fan are connected to the main exhaust duct; An exhaust gas exhaust pipe, which is connected to the main exhaust pipe and is arranged at the end of the main exhaust pipe, and an exhaust gas collecting fan is connected to the exhaust gas exhaust pipe; A bypass air duct is connected to the main exhaust duct for bypassing the exhaust gas to the main exhaust duct. A bypass electric valve is connected to the bypass air duct.

2. An exhaust gas treatment control system according to claim 1, characterized in that: The air inlet end of the main collecting fan is connected to the air outlet end of the exhaust gas treatment device, the air inlet end of the exhaust gas treatment device is connected to the main exhaust duct, and the air inlet end of the main exhaust duct is connected to the air outlet end of the exhaust gas exhaust duct and the air outlet end of the bypass air duct.

3. The exhaust gas treatment control system according to claim 1, characterized in that: The main summing fan is preset with a minimum operating frequency, and the bypass electric valve can be in an open or closed state according to the minimum operating frequency of the main summing fan, wherein: When the frequency conversion of the main and summing fans is lower than the minimum operating frequency, the bypass electric valve opens; When the frequency conversion of the main and summing fans is greater than or equal to the minimum operating frequency, the bypass electric valve is closed.

4. The exhaust gas treatment control system according to claim 1, characterized in that: The bypass electric valve is an electric switch sealed valve, which is used to automatically control the opening and closing of the bypass air duct.

5. The exhaust gas treatment control system according to claim 1, characterized in that: The bypass air duct pipe and the exhaust gas exhaust pipe are both branch pipes connected to the main exhaust pipe, and the exhaust and ventilation between the bypass air duct pipe and the exhaust gas exhaust pipe do not affect each other.

6. The exhaust gas treatment control system according to claim 1, characterized in that: The main exhaust duct is connected to a plurality of exhaust ducts, the exhaust of the plurality of exhaust ducts does not affect each other, and any exhaust duct is connected to an exhaust gas collecting fan.

7. An exhaust gas treatment control system according to claim 6, characterized in that: An electric valve is connected to any one of the exhaust gas exhaust pipes, and the electric valve is an electric switch closed valve, and the electric switch closed valve is used to automatically control the opening and closing of the exhaust gas collection fan.

8. The exhaust gas treatment control system according to claim 1, characterized in that: The main exhaust pipe is connected with a main electric valve, which is an electric switch closed valve used to automatically control the opening and closing of the main collection fan. When the electric valve on any exhaust gas exhaust pipe is opened, the corresponding exhaust gas collection fan is turned on, the main electric valve is opened, and the main collection fan is turned on; When the electric valves on all exhaust gas exhaust pipes are closed, all corresponding exhaust gas collection fans are closed, the main electric valve is closed, and the main collection fan is closed.

9. The exhaust gas treatment control system according to claim 1, characterized in that: The main and summing fans are variable frequency fans, and a frequency converter is arranged inside the main and summing fans, and the frequency converter performs variable frequency control on the main and summing fans.

10. The exhaust gas treatment control system according to claim 1, characterized in that: The exhaust gas treatment control system further comprises a controller, which is connected to the main electric valve, the electric valve and the bypass electric valve and is used for automatically controlling the opening and closing of the main electric valve, the electric valve and the bypass electric valve.

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