Flue gas emission continuous monitoring and sampling device and system

Abstract

The utility model belongs to the technical field of engineering measurement, and discloses a flue gas emission continuous monitoring and sampling device which comprises a sampling pipe and a sampling detection unit, the sampling pipe is used for conveying flue gas into the sampling detection unit for detection, and the sampling detection unit is provided with a backflow module used for enabling the flue gas to flow back into a flue. A plurality of horizontally arranged branch pipes are arranged at one end, positioned in the flue, of the sampling pipe, the plurality of branch pipes are radially arranged by taking the sampling pipe as a center, at least one input port is formed in each branch pipe, and the plurality of input ports form an input end of the sampling pipe. According to the device, the structure of the sampling pipe is optimized, multi-point sampling is achieved, meanwhile, installation is more convenient, the sampling range is wider, and the accuracy and authenticity of sampling analysis data are greatly improved. Meanwhile, the utility model further discloses a sampling system with the sampling device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of engineering surveying, and specifically relates to a flue gas emission continuous monitoring sampling device and system. BACKGROUND

[0002] CEMS (Continuous Emission Monitoring System) is a high-tech monitoring device applied to industrial facilities, aiming to realize real-time monitoring and data collection of pollutants in flue gas. The core function of this system is to monitor some key environmental pollutants, such as sulfur dioxide (SO2), nitrogen oxides (NOx), carbon monoxide (CO), particulate matter (PM), volatile organic compounds (VOCs), etc., and its application range covers power plants, oil refineries, cement plants, etc.

[0003] The operation process of CEMS usually includes gas sampling, analysis, data processing and transmission. First, the system extracts gas samples from the flue gas emission source through a dedicated sampling probe. Then, these samples will be sent to various analytical instruments for detection of pollutant concentration. After calculation and processing, the data will be recorded and visualized in real time to help managers make decisions.

[0004] Currently, the general design of CEMS equipment manufacturers is to match a sampling probe with a set of CEMS, and this probe is directly inserted into the flue for sampling and measurement. Due to the uneven distribution of flue gas inside the flue, the single-probe single-point extraction of flue gas cannot accurately represent the actual composition of the current flue gas, resulting in deviation of the final CEMS analyzer measurement results of flue gas.

[0005] To solve this problem, Chinese patent CN111551403A discloses a flue gas emission continuous monitoring sampling system, which uniformly sets multiple flue gas sampling branch pipes on the side wall of the chimney, with one end of the flue gas sampling branch pipe extending into the chimney, and the other end of the flue gas sampling branch pipe extending through the top surface of the mixing tank to the lower part of the mixing tank. A mixed gas outlet is provided on the top surface of the mixing tank, and the mixed gas outlet is connected to one end of a mixed gas pipe. The other end of the mixed gas pipe is connected to a sampling tank inlet on the top surface of the sampling tank. A flue gas discharge port is provided at the bottom of the sampling tank, and a sampling port is provided on the side surface of the sampling tank. The sampling port is connected to the inlet of a gas sampling pump, and the outlet of the gas sampling pump is connected to a flue gas analyzer. The flue gas discharge port is connected to the inlet of a gas taking pump, and the outlet of the gas taking pump is connected to the downstream discharge port of the chimney.

[0006] The above technical scheme adopts a multi-point sampling mode, can reduce the problem that the total sampling time is too long due to the back-and-forth switching of branch pipes for multi-point sampling, and the detection result does not match the overall situation in the flue. However, the above technical scheme adopts a mode of uniformly arranging multiple flue gas sampling branch pipes on the sidewall of the chimney to realize multi-point sampling. Although this mode can realize sampling from different positions, it needs to arrange pipes at multiple positions on the sidewall of the chimney, increasing the complexity and cost of installation. Moreover, the sampling range still has certain limitations. Utility model content

[0007] The purpose of the present application is to solve the above problems, and a flue gas emission continuous monitoring sampling device is provided. The structure of the sampling pipe is optimized, multiple branch pipes radially arranged around the sampling pipe are arranged on the sampling pipe, at least one input port is arranged on each branch pipe, the sampling gas of each branch pipe is automatically mixed in the sampling pipe to form uniform flue gas, multi-point sampling is realized, the installation is more convenient, the sampling range is wider, and the accuracy and authenticity of the sampling analysis data are greatly improved. Meanwhile, the present application also provides a flue gas emission continuous monitoring sampling system with the device.

[0008] To achieve the above purpose, the present application provides the following technical scheme:

[0009] A flue gas emission continuous monitoring sampling device, comprising a sampling pipe and a sampling detection unit, the input end of the sampling pipe is located in an externally arranged flue, the sampling pipe is used for conveying flue gas to the sampling detection unit for detection, a backflow module for backflowing flue gas into the flue is arranged on the sampling detection unit, multiple horizontally arranged branch pipes are arranged on one end of the sampling pipe in the flue, the multiple branch pipes are radially arranged around the sampling pipe, at least one input port is arranged on each branch pipe, and the multiple input ports constitute the input end of the sampling pipe.

[0010] Preferably, a flow guide pipe is further included, the flow guide pipe comprises a connecting portion and a flared portion, a first connecting pipe vertically arranged on the branch pipe, the input port is located on the first connecting pipe, and the connecting portion is detachably connected with the first connecting pipe.

[0011] Preferably, a backblowing module is further included, the input end of the backblowing module is connected with the sampling detection unit, the gas outlet end of the backblowing module is connected with the branch pipe, and the backblowing module is used for conveying flue gas in the sampling detection unit into the branch pipe.

[0012] Preferably, the backblowing module comprises a conveying pipe, a compressor and a first control valve arranged on the conveying pipe, the input end of the conveying pipe is connected with the sampling detection unit, the gas outlet end of the conveying pipe extends into the flue, multiple gas outlets are arranged on the gas outlet end of the conveying pipe, a gas outlet pipe is arranged on each gas outlet, and the gas outlet pipe is connected with the branch pipe.

[0013] Preferably, the branch pipes are provided with vertically arranged second connecting pipes in communication with the branch pipes, the second connecting pipes are located above the input ports, the conveying pipes are provided with third connecting pipes, the gas outlets are located on the third connecting pipes, one end of the gas outlet pipes is detachably connected with the second connecting pipes, and the other end of the gas outlet pipes is detachably connected with the third connecting pipes.

[0014] Preferably, the second connecting pipes correspond to the input ports one by one in up and down directions.

[0015] Preferably, the sampling and detecting unit comprises a sampling tank, a flue gas analyzer, a sampling pipe connected with the sampling tank, a second control valve arranged on the sampling pipe, a backflow module arranged on the sampling tank, and a probe of the flue gas analyzer connected with the sampling tank.

[0016] Preferably, the backflow module comprises a backflow pipe, a backflow pump and a backflow valve arranged on the backflow pipe, one end of the backflow pipe is connected with the sampling and detecting unit, and an input end of the backflow pipe extends into the flue and is located above the branch pipes.

[0017] Meanwhile, the application also provides a flue gas emission continuous monitoring sampling system comprising a plurality of the above flue gas emission continuous monitoring sampling devices, and the sampling pipes of the plurality of flue gas emission continuous monitoring sampling devices are located in the externally arranged flue and form a plurality of sampling areas in the same horizontal section of the flue.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] The device optimizes the structure of the sampling pipe, and a plurality of branch pipes radially arranged around the sampling pipe are arranged on the sampling pipe, at least one input port is arranged on each branch pipe, the sampling gas of each branch pipe is automatically mixed in the sampling pipe to form uniform flue gas, multi-point sampling is realized, the installation is more convenient, and after the sampling system adopts the device, the sampling range is wider, and the accuracy and authenticity of the sampling analysis data are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a piping diagram of the flue gas emission continuous monitoring sampling device of Example 1;

[0021] Figure 2 is a structural schematic view of the sampling pipe of the flue gas emission continuous monitoring sampling device of Example 1;

[0022] Figure 3 is a positional relationship schematic view of the sampling pipe and the conveying pipe of the flue gas emission continuous monitoring sampling device of Example 1;

[0023] Figure 4 is a sectional schematic view of the branch pipe of the flue gas emission continuous monitoring sampling device of Example 1;

[0024] Figure 5 is a layout schematic diagram of a flue gas emission continuous monitoring sampling system of Example 2;

[0025] In the drawings, each reference numeral is as follows:

[0026] Sampling pipe 1; sampling detection unit 2; back flushing module 3; branch pipe 11; flow guide pipe 12; second control valve 13; backflow module 21; sampling tank 22; flue gas analyzer 23; conveying pipe 31; compressor 32; first control valve 33; first connecting pipe 111; second connecting pipe 112; connecting part 121; flared part 122; backflow pipe 211; backflow pump 212; backflow valve 213; gas outlet pipe 311; third connecting pipe 312; flue A; region B. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Example 1

[0029] Reference Figures 1 to 4 A flue gas emission continuous monitoring sampling device, comprising a sampling pipe 1 and a sampling detection unit 2, the input end of the sampling pipe 1 is located in an external flue A, the sampling pipe 1 is used to convey flue gas to the sampling detection unit 2 for detection, the sampling detection unit 2 is provided with a backflow module 21 for backflow of flue gas into the flue A, one end of the sampling pipe 1 located in the flue A is provided with a plurality of horizontally arranged branch pipes 11, the plurality of branch pipes 11 are radially arranged with the sampling pipe 1 as the center, at least one input port is provided on each branch pipe 11, and the plurality of input ports constitute the input end of the sampling pipe 1.

[0030] Under this design, only the sampling pipe 1 is arranged on the outer wall of the flue A, and the plurality of branch pipes 11 are located in the flue A at the same time. During detection, under the negative pressure provided by the backflow module 21, the gas enters the sampling pipe 1 from the input ports on the plurality of branch pipes 11 to automatically mix and form uniform flue gas, and the flue gas is conveyed to the sampling detection unit 2 through the sampling pipe for flue gas measurement to monitor the flue gas in the flue. The backflow module 21 backflows the measured flue gas to the flue A. In this way, multi-point sampling is realized, the installation is more convenient, the sampling range is wider, and the accuracy and authenticity of the sampling analysis data are greatly improved.

[0031] It should be noted that, under the premise of meeting the sampling, without affecting the flue gas flow in the flue A, the branch pipe 11 is preferably three or four, and the operator can use three or four according to the actual situation; in the preferred embodiment, the branch pipe 11 is arranged in a circumferential array on the sampling pipe 1 with the sampling pipe 1 as the center.

[0032] In the embodiment, the flow guide pipe 12 is also included, the flow guide pipe 12 includes a connecting part 121 and a flared part 122, the branch pipe 11 is provided with a first connecting pipe 111 arranged vertically, and the input port is located on the first connecting pipe 111; the connecting part 121 is detachably connected with the first connecting pipe 111.

[0033] In actual use, the flow guide pipe 12 is funnel-shaped, and the flared part 122 can increase the gas trapping area and enhance the gas suction efficiency, so as to ensure that more gas is sucked into the sampling pipe 1; and the connecting part 121 is used to ensure the stability of the connection between the flow guide pipe 12 and the branch pipe 11.

[0034] In the preferred embodiment, the connecting part 121 and the first connecting pipe 111 are detachably connected in a threaded connection manner;

[0035] In other embodiments, the connecting part 121 can also be detachably connected in a clamping manner;

[0036] The embodiment is based on the premise of reliability, economy and sealing, and the threaded connection manner is selected.

[0037] The embodiment also includes a back blowing module 3, the input end of the back blowing module 3 is connected to the sampling detection unit 2, the gas outlet of the back blowing module 3 is connected to the branch pipe 11, and the back blowing module 3 is used to transport the flue gas in the sampling detection unit 2 to the branch pipe 11. The sampled flue gas is reused by the back blowing module 3, the flue gas in the sampling detection unit 2 is transported to the branch pipe 11, the flow guide pipe 12 is back blown, and the dust in the flow guide pipe 12 is blown off.

[0038] Specifically, the back blowing module 3 includes a conveying pipe 31, a compressor 32 and a first control valve 33 arranged on the conveying pipe 31, the input end of the conveying pipe 31 is connected to the sampling detection unit 2, the gas outlet of the conveying pipe 31 extends into the flue A, a plurality of gas outlets are arranged on the gas outlet of the conveying pipe 31, and a gas outlet pipe 311 is arranged on each gas outlet, and the gas outlet pipe 311 is connected to the branch pipe 11.

[0039] In actual use, the operator can set the intermittent back blowing mode according to the actual situation through the linkage of the first control valve 33 and the compressor 32. When the first control valve 33 is opened, the compressor 32 delivers the flue gas in the sampling and detecting unit 2 into the delivery pipe 31, and the flue gas is shunted through the multiple gas outlet pipes 311 on the delivery pipe 31 and delivered into each branch pipe 11 to back blow the flow guide pipe 12.

[0040] It should be further noted that, in the embodiment, the back blowing is pulse back blowing, that is, the instantaneous high pressure gas flow of the compressor 32 is reversely impacted, and the back blowing positive pressure is higher than the absolute value of the suction negative pressure, specifically 1.5-3 times. The whole back blowing process is completed in 0.3-0.5 s, and the main gas flow is almost not affected due to the short time.

[0041] Preferably, in order to facilitate the maintenance of the branch pipe 11, the delivery pipe 31 and the gas outlet pipe 311, a second connecting pipe 112 vertically arranged on the branch pipe 11 is provided, the second connecting pipe 112 is in communication with the branch pipe 11, the second connecting pipe 112 is located above the input port, a third connecting pipe 312 is provided on the delivery pipe 31, the gas outlet is located on the third connecting pipe 312, one end of the gas outlet pipe 311 is detachably connected with the second connecting pipe 112, and the other end of the gas outlet pipe 311 is detachably connected with the third connecting pipe 312.

[0042] In the preferred embodiment, the gas outlet pipe 311 can be a gas outlet pipe 311 with a threaded joint, and therefore a thread matched with the threaded joint is provided on the second connecting pipe 112 and the third connecting pipe 312 respectively, and the gas outlet pipe 311 is detachably connected with the second connecting pipe 112 and the third connecting pipe 312 through the threaded joints at the two ends thereof, so as to improve the convenience of installation and maintenance.

[0043] Further, in order to make the back blowing more direct, in the embodiment, the second connecting pipe 112 corresponds to the input port one by one in up and down directions, that is, the second connecting pipe 112 and the flow guide pipe 12 correspond to each other in up and down directions, and the flue gas output through the gas outlet pipe 311 can be directly blown to the flow guide pipe 12.

[0044] In the embodiment, the sampling and detecting unit 2 includes a sampling tank 22 and a flue gas analyzer 23, the sampling pipe 1 is connected with the sampling tank 22, the second control valve 13 is provided on the sampling pipe 1, the backflow module 21 is arranged on the sampling tank 22, and the probe of the flue gas analyzer 23 is connected with the sampling tank 22.

[0045] Specifically, the backflow module 21 can provide a negative pressure environment for the sampling tank 22, so that the flue gas can enter the sampling tube 1 from the branch pipe, and then enter the sampling tank 22 from the sampling tube 1, the probe of the flue gas analyzer 23 can complete sampling and detection in the sampling tank 22, and the flue gas in the sampling tank 22 can flow back to the flue A through the backflow module 21, and can also be used by the backwashing module 3. Further, the backflow module 21 includes a backflow pipe 211, a backflow pump 212 and a backflow valve 213 arranged on the backflow pipe 211, one end of the backflow pipe 211 is connected with the sampling and detection unit 2, and the input end of the backflow pipe 211 extends into the flue A. When the backflow pump 212 is turned on, the flue gas in the sampling tank 22 can be pumped back into the flue A under the action of the backflow pump 212, and the backflow pump 212 can also provide a negative pressure environment for the sampling tank 22.

[0046] Embodiment 2

[0047] Reference Figure 5 A flue gas emission continuous monitoring sampling system, comprising a plurality of flue gas emission continuous monitoring sampling devices as in Embodiment 1, the sampling tubes 1 of the plurality of flue gas emission continuous monitoring sampling devices are located in the external flue A, and form a plurality of sampling areas B in the same horizontal section of the flue A.

[0048] In this design, the operator arranges a predetermined number of sampling tubes 1 in the flue A according to the actual size of the flue A, so as to form a plurality of sampling areas B in the same horizontal section of the flue A, the sampling range is wider, and through detection and data comparison of the plurality of sampling areas B, the accuracy and authenticity of the sampling and analysis data are greatly improved.

[0049] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, several improvements or modifications can be made without departing from the principles of the present application, and these improvements or modifications should also be regarded as the protection scope of the present application.

Claims

1. A continuous emission monitoring and sampling device for flue gas, comprising a sampling tube and a sampling and detection unit, wherein the input end of the sampling tube is located in an external flue, the sampling tube is used to transport flue gas to the sampling and detection unit for detection, and the sampling and detection unit is provided with a recirculation module for returning the flue gas to the flue, characterized in that, The sampling tube has multiple horizontally arranged branch pipes at one end inside the flue. The multiple branch pipes are arranged radially around the sampling tube. Each branch pipe has at least one input port, and the multiple input ports constitute the input end of the sampling tube.

2. The continuous emission monitoring and sampling device for flue gas according to claim 1, characterized in that, It also includes a guide pipe, which includes a connecting part and a flared part. The branch pipe is provided with a vertically arranged first connecting pipe, the inlet is located on the first connecting pipe, and the connecting part is detachably connected to the first connecting pipe.

3. The continuous flue gas emission monitoring and sampling device according to claim 1, characterized in that, It also includes a backflush module, the input end of which is connected to the sampling and detection unit, and the outlet end of which is connected to the branch pipe. The backflush module is used to transport the flue gas in the sampling and detection unit to the branch pipe.

4. The continuous emission monitoring and sampling device for flue gas according to claim 3, characterized in that, The backflushing module includes a delivery pipe, a compressor mounted on the delivery pipe, and a first control valve. The input end of the delivery pipe is connected to the sampling and detection unit, and the outlet end of the delivery pipe extends into the flue. The outlet end of the delivery pipe is provided with multiple outlets, and each outlet is provided with an outlet pipe, which is connected to the branch pipe.

5. The continuous emission monitoring and sampling device for flue gas according to claim 4, characterized in that, The branch pipe is provided with a vertically arranged second connecting pipe, which is connected to the branch pipe and is located above the inlet. The delivery pipe is provided with a third connecting pipe, and the air outlet is located on the third connecting pipe. One end of the air outlet is detachably connected to the second connecting pipe, and the other end of the air outlet is detachably connected to the third connecting pipe.

6. The continuous flue gas emission monitoring and sampling device according to claim 5, characterized in that, The second connecting tube corresponds one-to-one with the input port.

7. The continuous emission monitoring and sampling device for flue gas according to claim 1, characterized in that, The sampling and detection unit includes a sampling canister and a flue gas analyzer. The sampling tube is connected to the sampling canister, and a second control valve is provided on the sampling tube. The reflux module is installed on the sampling canister, and the probe of the flue gas analyzer is connected to the sampling canister.

8. The continuous emission monitoring and sampling device for flue gas according to claim 1, characterized in that, The reflux module includes a reflux pipe, a reflux pump and a reflux valve installed on the reflux pipe. One end of the reflux pipe is connected to the sampling and detection unit, and the input end of the reflux pipe extends into the flue and is located above the branch pipe.

9. A continuous monitoring and sampling system for flue gas emissions, characterized in that, It includes multiple continuous emission monitoring and sampling devices for flue gas as described in any one of claims 1 to 8, wherein the sampling tubes of the multiple continuous emission monitoring and sampling devices for flue gas are all located in an external flue, and multiple sampling areas are formed in the same horizontal cross section of the flue.

Images