WO2023077779A1

WO2023077779A1 - On-line monitoring system and method for high-temperature garbage pyrolysis gas

Info

Publication number: WO2023077779A1
Application number: PCT/CN2022/094937
Authority: WO
Inventors: 王少江; 毛凯
Original assignee: 二重（德阳）重型装备有限公司
Priority date: 2021-11-04
Filing date: 2022-05-25
Publication date: 2023-05-11
Also published as: CN114002388B; CN114002388A

Abstract

An on-line monitoring system and method for high-temperature garbage pyrolysis gas. The system comprises a multi-point gas collection device (1), a filter device (2), a buffer device (3), a bidirectional peristaltic pump (4), and a gas sensor (5), which are sequentially in communication by means of a communication pipeline, wherein the multi-point gas collection device (1) can extend into a plurality of positions in a garbage pyrolysis gas pipeline for multi-point continuous automatic testing. When in use, a first switching valve (61) and a second switching valve (62) are opened, and the bidirectional peristaltic pump (4) is turned on in a forward direction, such that a test path is in communication. The multi-point gas collection device (1) is extended into the garbage pyrolysis gas pipeline for gas collection and analysis at a plurality of positions. Compared with a traditional single-point gas collection method, this solution can realize multi-point continuous automatic testing of different areas in the pipeline, such that the obtained results are closer to actual conditions.

Description

A system and method for on-line monitoring of high-temperature garbage pyrolysis gas

technical field

The invention relates to gas on-line monitoring, in particular to an on-line monitoring system and method for pyrolysis gas of high-temperature garbage.

Background technique

With the acceleration of my country's urbanization process, the output of urban domestic waste has increased sharply, and the phenomenon of "garbage siege" is becoming more and more serious. Melting pyrolysis technology is an anaerobic heat treatment of domestic waste, which prevents the formation of dioxins from the source, and the combustible gas produced by pyrolysis can be used for power generation and combustion for heat supply, etc. chemical, harmless" treatment.

The high-temperature pyrolysis of combustibles in domestic waste is a crucial part of the melting and cracking line treatment process. The composition and concentration of pyrolysis gas is an important basis for the control optimization of waste melting and pyrolysis process, and the control of combustion power generation and heating process. Since urban domestic waste is a multi-component mixture, and its composition varies greatly in different regions and in different periods, pyrolysis gas is usually accompanied by high temperature (800-2500°C), high dust (≥10g/m3) and corrosiveness. In the prior art, the commonly used high-temperature flue gas analyzers are mainly applicable in the temperature range of 300-1100 ° C, and the content of particulate matter in the flue gas is high, which is easy to cause blockage at the jet nozzle of the gas jet, and the life of the equipment is short. damage. There is frictional resistance on the inner wall of the pipeline, and there is a problem of uneven distribution of components and concentrations during the flow of gas in the pipeline, which leads to the need to improve the accuracy of the test results. Therefore, it is of great significance to conduct further research on the online monitoring system of high temperature pyrolysis gas.

Contents of the invention

In order to solve the above-mentioned part of the technical problems at least, the purpose of the first aspect of the present invention is:

An on-line monitoring system for pyrolysis gas of high-temperature garbage is provided, the system includes a multi-point gas collection device, a filter device, a buffer device, a bidirectional peristaltic pump, and a gas sensor, which are sequentially connected by a communication pipeline;

The multi-point gas collection device can extend into the garbage pyrolysis gas pipeline to collect pyrolysis gas at multiple positions;

The communication pipeline between the multi-point gas collection device and the buffer device is provided with a first switch valve, and the first switch valve is used to open and close the connection between the multi-point gas collection device and the buffer device. Connecting pipeline;

A second switching valve is provided on the communication pipeline between the bidirectional peristaltic pump and the gas sensor, and the second switching valve is used to open and close the communication pipeline between the bidirectional peristaltic pump and the gas sensor.

Further, the garbage pyrolysis gas pipeline is provided with a collection port, the multi-point gas collection device includes a fixed cylinder and a collection tube, the collection tube is at least partially accommodated in the fixed cylinder, and the fixed cylinder is used for Sealedly connected with the collection port, the collection tube can move relative to the fixed cylinder along the axial direction of the fixed cylinder.

Further, the multi-point gas collection device also includes a bellows, one end of the collection pipe extending into the garbage pyrolysis gas pipeline is the collection end, the other end is the movable end, and the fixed cylinder is close to the garbage pyrolysis gas pipeline. One end of the gas pipe is a fixed end, and the other end is a sealed end;

One end of the bellows is sealingly connected to the sealing end of the fixed cylinder, and the other end of the bellows is sealingly connected to the movable end of the collection tube.

Further, the inner wall of the fixed cylinder is provided with a locking part, and the outer wall of the collection tube is provided with an elastic locking body, and when the collection tube moves relative to the fixed cylinder, the elastic locking body can extend into The locking part is used to realize the position locking of the collection tube relative to the fixing cylinder.

Further, the gas inlet at the collection end of the collection pipe is an elastic collection port, the elastic collection port is "X" shaped, and the entrance area of the elastic collection port is inversely proportional to the flow rate of the waste pyrolysis gas.

Further, it also includes an intake pipe and a blowback pipe;

The air intake pipe is connected to the communication pipeline between the bidirectional peristaltic pump and the second switch valve through a three-way pipe, and a third switch valve is arranged at the entrance of the air intake pipe;

The blowback pipe is connected to the communication pipeline between the buffer device and the first switch valve through a three-way pipe, and a fourth switch valve is provided at the outlet of the blowback pipe.

Further, a cooling device is also included, and the filtering device and the buffering device are housed in the cooling device.

Further, an elastic airbag is provided on the communication pipeline between the buffer device and the bidirectional peristaltic pump, and the elastic airbag is used to generate high-pressure blowback gas when the bidirectional peristaltic pump is opened in reverse.

The purpose of the second aspect of the present invention is to provide a method for on-line monitoring of high-temperature garbage pyrolysis gas, the method comprising the following steps:

Step S001: arranging the aforementioned high-temperature waste pyrolysis gas online monitoring system, so that all switch valves are in a closed state;

Step S002: open the cooling device;

Step S003: Open the first on-off valve and the second on-off valve, make the collection pipe extend into the garbage pyrolysis gas pipeline, open the bidirectional peristaltic pump in the forward direction, and perform on-line monitoring of the garbage pyrolysis gas;

Step S004: change the position of the collection tube relative to the fixed cylinder, and continue to perform on-line monitoring of the garbage pyrolysis gas;

Step S005: Repeat step S004.

Further, the present invention also provides a backflushing method for the on-line monitoring process of high-temperature garbage pyrolysis gas, the method comprising the following steps:

Step S006: make all switch valves in closed state;

Step S007: open the third switching valve;

Step S008: reversely open the bidirectional peristaltic pump, so that the elastic airbag is in a high-pressure expansion state;

Step S009: Open the fourth on-off valve, and the high-pressure gas generated by the elastic airbag in the high-pressure expansion state blows the particles in the filter device to the outside of the blowback pipe.

Compared with prior art, the beneficial effect of the present invention is:

1) The multi-point gas collection device in the present invention can be extended into different areas in the garbage pyrolysis gas pipeline to perform multi-point continuous automatic detection. When in use, the first on-off valve and the second on-off valve are opened (the other valves are in a closed state), and the bidirectional peristaltic pump is opened forward to make the detection passage communicate. Extend the multi-point gas collection device into the garbage pyrolysis gas pipeline to collect and analyze gas at multiple positions. Compared with the traditional single-point collection method, this solution can realize multi-point continuous automatic detection in different areas inside the pipeline , the obtained results are closer to the actual working conditions;

2) The multi-point gas collection device in the present invention is provided with a collection tube and a fixed cylinder. When in use, it only needs to change the relative position of the collection tube relative to the fixed cylinder to realize multi-point continuous automatic detection of different areas inside the pipeline, and the operation easy and convenient;

3) The present invention sets bellows, and the pyrolysis gas leaked from the gap between the collection pipe and the fixed cylinder can enter the bellows to further collect the leaked pyrolysis gas, further preventing thermal leakage of solution gas;

4) In the present invention, an elastic locking body and a plurality of locking parts are respectively arranged on the collection tube and the inner wall of the fixing cylinder. When the elastic locking body moves to a position corresponding to the locking part on the inner wall of the fixing cylinder, the elastic locking The body pops up and extends into the locking part to realize the position locking of the collection tube relative to the fixed cylinder, and then realize the locking of the collection position of the collection end in the waste pyrolysis gas pipeline;

5) The present invention is set as elastic collection mouth by the collection mouth of the collection end of described collection pipe, the size of the gas inlet area of described collection mouth can change along with the change of described rubbish pyrolysis gas flow velocity; Like this, by adjusting The size of the gas inlet area of the collection end of the collection tube, so as to realize the control of the flow of gas entering the collection tube, and then ensure the accuracy of each collection result;

6) The present invention removes the solid particles on the filter device by using the principle of back blowing by arranging the intake pipe and the back blowing pipe; by setting an elastic air bag on the communication pipeline between the buffer device and the bidirectional peristaltic pump to generate high pressure back blowing gas to improve the blowback effect.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present invention or in the description of the prior art. Obviously, the accompanying drawings described below are only illustrations of the present invention For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of an online monitoring system for pyrolysis gas of high-temperature garbage in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the connection between the multi-point gas collection device and the garbage pyrolysis gas pipeline in one embodiment of the present invention;

Fig. 3 is the sectional view of Fig. 2;

Figure 4 is an enlarged view of part of the structure in Figure 3;

Fig. 5 is a schematic diagram of the structure of the fixed cylinder in Fig. 2;

Fig. 6 is a schematic structural diagram of the garbage pyrolysis gas pipeline in Fig. 2;

Fig. 7 is a schematic diagram of the structure of the gas inlet at the collection end of the collection tube in one embodiment of the present invention;

Fig. 8 is a structural schematic diagram showing the size of the gas inlet at the collection end changing with the flow rate of the collected gas as described in Fig. 7;

Fig. 9 is a schematic diagram of the direction of airflow in the backflushing process in an embodiment of the present invention.

In the figure, 1-multi-point gas collection device, 11-fixed cylinder, 111-fixed end, 112-sealed end, 113-locking part, 12-collecting tube, 121-collecting end, 122-movable end, 123-elastic locking Body, 13-first sealing part, 14-bellows, 15-second sealing part, 2-filter device, 3-buffer device, 4-bidirectional peristaltic pump, 5-gas sensor, 6-garbage pyrolysis gas pipeline, 7-Intake pipe, 8-Blowback pipe, 9-Cooling device, 91-Water inlet, 92-Water outlet, 10-Elastic air bag, 61-First switch valve, 62-Second switch valve, 63-Third switch valve , 64-the fourth switching valve.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is some embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the present invention, unless otherwise clearly specified and limited, the first feature above or below the second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact but is through additional feature contacts between them. Moreover, the first feature on, above and above the second feature includes the first feature directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature being below, below and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In view of this, as shown in Figure 1, an embodiment of the present invention provides an online monitoring system for high-temperature waste pyrolysis gas, which includes: a multi-point gas collection device 1 and a filter device 2 connected in sequence by communication pipelines , buffer device 3, bidirectional peristaltic pump 4, gas sensor 5;

The multi-point gas collection device 1 can extend into the garbage pyrolysis gas pipeline 6 to collect pyrolysis gas at multiple positions;

The communication pipeline between the multi-point gas collection device 1 and the buffer device 3 is provided with a first switch valve 61, and the first switch valve 61 is used to open and close the multi-point gas collection device 1 and the buffer device 3. The communication pipeline between the buffer devices 3;

The communication pipeline between the bidirectional peristaltic pump 4 and the gas sensor 5 is provided with a second switching valve 62, and the second switching valve 62 is used to open and close the connection between the bidirectional peristaltic pump 4 and the gas sensor 5. connecting pipes between them.

Due to the frictional resistance on the inner wall of the garbage pyrolysis gas pipeline 6, there is a problem of uneven distribution of components and concentrations during the flow of the gas in the pipeline, resulting in the accuracy of the obtained detection results to be improved.

In the above solution, the multi-point gas collection device 1 can be extended into different areas in the garbage pyrolysis gas pipeline 6 to perform multi-point continuous automatic detection. When in use, open the first on-off valve 61 and the second on-off valve 62 (the other valves are in a closed state), open the bidirectional peristaltic pump 4 in the forward direction, and make the detection passage communicate. Stretching the multi-point gas collection device 1 into the garbage pyrolysis gas pipeline 6, by changing the position of the multi-point gas collection device in the radial direction of the garbage pyrolysis gas pipeline 6, the continuous gas collection and analysis of multiple positions is carried out, Compared with the traditional single-point acquisition method, this solution can realize multi-point continuous automatic detection of different areas inside the pipeline, and the obtained results are closer to the actual working conditions.

In the above scheme, preferably, a YZ1515X type bidirectional peristaltic pump 4 can be used, which can realize the forward and reverse directions of the gas in the pump. , Convey in two directions.

In the above solution, preferably, a multi-parameter gas sensor can be used to realize real-time detection of CO, CO2, CH4, H2, O2, C2H4, C2H6 and other gas components and concentrations in the waste pyrolysis gas.

Further, as shown in Fig. 2, Fig. 3 and Fig. 6, the garbage pyrolysis gas pipeline 6 is provided with a collection port 61, and the multi-point gas collection device 1 includes a fixed cylinder 11 and a collection pipe 12, and the collection The tube 12 is at least partly accommodated in the fixed cylinder 11, and the fixed cylinder 11 is used for sealing connection with the collection port 61, and the collection tube 12 can be moved along the fixed cylinder 11 Move in the axial direction; in this way, the collection pipe 12 of the multi-point gas collection device 1 can be stretched into different areas in the garbage pyrolysis gas pipeline 6; It can realize multi-point continuous automatic detection of different areas inside the pipeline, and the operation is simple and convenient.

Preferably, the collection tube 12 is connected to the fixed cylinder 11 in a threaded manner. Specifically, an internal thread is provided on the inner wall of the fixing cylinder 11, and an external thread is provided at a corresponding position on the outer wall of the collection tube 12. Through the cooperation of the internal thread and the external thread, the collection tube 12 is screwed in or out. The fixed cylinder 11, optionally, as shown in FIG. 3 , an external thread is provided at the narrow diameter of the collection tube 12, and an internal thread is provided at the corresponding position of the fixed tube 11. Of course, it is also possible to connect the collection tube 12 and the fixed cylinder The other positions of 11 are provided with the above-mentioned external thread and internal thread, which are not specifically limited here.

Further, as shown in FIG. 2 , due to insufficient sealing of the threaded connection, pyrolysis gas may easily leak from the threaded connection between the collection pipe 12 and the fixed cylinder 11 . In order to solve the above problems, a first sealing part 13 and a second sealing part 15 are provided. Preferably, the first sealing part 13 and the second sealing part 15 are elastic sealing rings; Grooves for accommodating the first sealing portion 13 and the second sealing portion 15 are provided on the top.

In one embodiment of the present invention, as shown in Figure 2 and Figure 3, the multi-point gas collection device 1 also includes a bellows 14, and one end of the collection pipe 12 extending into the garbage pyrolysis gas pipeline 6 is The collection end 121, the other end is a movable end 122, the end of the fixed cylinder 11 close to the garbage pyrolysis gas pipeline 6 is a fixed end 121, and the other end is a sealing end 122; one end of the bellows 14 is sealed and connected to the The sealing end 122 of the fixed cylinder 11 is fixed, and the other end of the bellows 14 is sealed and connected with the movable end 122 of the collecting tube 12 .

In the above solution, when the first sealing part 13 and the second sealing part 15 are damaged, by setting the bellows 14, the pyrolysis leaked from the gap between the collection tube 12 and the fixed cylinder 11 The gas can enter the bellows 14 to further collect the leaked pyrolysis gas and further prevent the leakage of the pyrolysis gas.

Preferably, the bellows 14 is made of high temperature resistant elastic material.

Further, as shown in Fig. 3 to Fig. 5, a locking portion 113 is provided on the inner wall of the fixing cylinder 11, and an elastic locking body 123 is provided on the outer wall of the collection tube 12, when the collection tube 12 is relative to the When the fixing cylinder 11 moves, the elastic locking body 123 can extend into the locking portion 113 to realize the position locking of the collection tube 12 relative to the fixing cylinder 11 .

In the above solution, as shown in FIG. 3 , the collection end 121 of the collection pipe 12 is located at a certain position in the middle of the waste pyrolysis gas pipeline 6 for gas collection. At this time, the elastic locking body 123 on the collection tube 12 just corresponds to the position of a certain locking part 113 on the inner wall of the fixed cylinder 11. The locking part 113 realizes the position locking of the collection tube 12 relative to the fixing cylinder 11 .

When the position of the collection end 121 of the collection pipe 12 needs to be changed, the collection pipe 12 can be rotated so that the collection pipe 12 moves in a direction close to the garbage pyrolysis gas pipeline 6 relative to the fixed cylinder 11 . At this time, the elastic locking body 123 on the collection pipe 12 is squeezed by the inner wall of the fixed cylinder 11 to retract the collection pipe 12 body, and follows the collection pipe 12 to the left relative to the fixed cylinder 11 to approach the garbage heat. The direction movement of degassing pipeline 6. When moving to the position where the elastic locking body 123 corresponds to the next locking portion 113 on the inner wall of the fixing cylinder 11, the elastic locking body 123 pops out and extends into the locking portion 113, so that the collection tube 12 is relatively It is locked at the position of the fixed cylinder 11, thereby realizing the locking of the collection position of the collection end 121 in the waste pyrolysis gas pipeline 6.

In practice, multiple locking portions 113 may be provided on the inner wall of the fixed cylinder 11 according to collection requirements, and each locking portion 113 corresponds to a collection position. During collection, only the position of the collection pipe 12 relative to the fixed cylinder 11 needs to be changed, and continuous collection of pyrolysis gas can be realized.

In one embodiment of the present invention, as shown in FIG. 7 , the gas inlet of the collection end 121 of the collection tube 12 is an elastic collection port, and the elastic collection port is in an "X" shape, and the entrance of the elastic collection port is The size of the area is inversely proportional to the flow rate of the pyrolysis gas of the garbage.

In the actual collection process, the commonly used gas collection port is mostly of a single shape, if the cross section of the gas collection port is circular, elliptical or other single shape. However, due to various factors, the flow rate of the pyrolysis gas in the waste pyrolysis gas pipeline 6 is usually unstable, sometimes fast and sometimes slow, which leads to inconsistencies in the gas flow entering the collection pipe 12, thereby affecting the collection results.

In the above scheme, the collection port of the collection end 121 of the collection tube 12 is set as an elastic collection port, and the elastic collection port is in an "X" shape, and the X-shaped elastic collection port has the following properties, when the garbage When the pyrolysis gas flow rate became larger, the collection port shrank (as shown in the solid line part in Figure 8), and the gas inlet area became smaller; when the waste pyrolysis gas flow rate became smaller, the collection port expanded and expanded (as shown in Fig. 8), the gas inlet area becomes larger. That is, the size of the gas inlet area of the collection port can be changed inversely proportional to the change of the flow rate of the waste pyrolysis gas.

In practical applications, the area of the collection port can be adjusted according to the gas flow rate in various ways. If the collection port is set as a flexible material, a gas flow sensor and a collection port contraction device (not shown) are arranged at the collection port at the same time, and the collection port contraction device is installed at the collection port for expanding or shrinking the collection port. When the flow rate of gas collected by the gas flow sensor becomes larger, the collection port contraction device shrinks, making the collection port shrink, and the gas inlet area becomes smaller; when the gas flow sensor collects a smaller gas flow rate, the collection port contraction device expands, making the collection port shrink The mouth expands, and the gas inlet area becomes larger.

Of course, other ways can also be used to adjust the area of the collection port according to the gas flow rate. There is no limitation here.

In this way, by adjusting the size of the gas inlet area of the collection end 121 of the collection tube 12, the gas flow rate entering the collection tube 12 can be controlled, thereby ensuring the accuracy of each collection result.

In one embodiment of the present invention, further, as shown in Fig. 1 and Fig. 9, an air inlet pipe 7 and a blowback pipe 8 are also included;

The intake pipe 7 is connected to the communication pipeline between the bidirectional peristaltic pump 4 and the second switch valve 62 through a three-way pipe, and a third switch valve 63 is provided at the entrance of the intake pipe 7;

The blowback pipe 8 is connected to the communication pipeline between the buffer device 3 and the first switch valve 61 through a three-way pipe, and a fourth switch valve 64 is provided at the outlet of the blowback pipe 8 .

Since the pyrolysis gas is often mixed with solid particles, the filter device 2 can filter out most of the solid particles in the pyrolysis gas, thereby preventing pipeline blockage. However, since a large amount of solid particles are attached to the filter element of the filter device 2, in order to ensure the filtering effect, the filter element of the filter device 2 needs to be replaced frequently, and the equipment cost is relatively large.

In the above solution, the solid particles on the filter element of the filter device 2 are cleaned by using the principle of back blowing, so that the service life of the filter element can be extended and the equipment cost can be reduced.

It should be noted that, during normal pyrolysis gas collection, the third on-off valve 63 and the fourth on-off valve 64 are in a closed state, that is, there is no communication between the inlet pipe 7 and the outlet pipe . When it is necessary to remove the solid particles on the filter element by the back blowing method, open the third on-off valve 63 and the fourth on-off valve 64 (close the first and second on-off valves 62), so that the air inlet pipe 7 is connected to the The back blowing pipes 8 are in a communication state, and the back blowing gas enters from the inlet pipe 7, passes through the buffer device 3 and the filter device 2, and flows out from the back blowing pipe 8.

In one embodiment of the present invention, a cooling device 9 is also included, and the filtering device 2 and the buffering device 3 are accommodated in the cooling device 9 .

Garbage pyrolysis gas is often in a high temperature state (800-2500°C), and it needs to be cooled to prevent the gas sensor 5 from burning out during the gas detection process.

In the above solution, by setting the cooling device 9 and accommodating the filter device 2 and the buffer device 3 in the cooling device 9, the pyrolysis gas is filtered through the filter device 2 while The first level of temperature reduction is realized, and the second level of temperature reduction is realized while entering the buffer device 3 to realize buffering. In this way, the sufficient cooling of the high-temperature gas is ensured through the form of multi-stage cooling.

Preferably, the filter device 2 is composed of a solid copper powder sintered filter element, a metal copper shell and aluminum fins. The selected solid copper powder sintered filter element has a pore size of less than 150 mesh and a length of more than 400mm. The solid copper powder sintered filter element is placed in the metal copper shell and tightly combined with the tube wall. The aluminum fins are located on the surface of the metal copper shell, and the fin distance is 8mm. 20mm.

Preferably, the buffer device 3 is the same as the metal copper shell and copper fins of the filter device 2, and the buffer device 3 does not have a built-in solid copper powder sintered filter element, and the buffer device 3 is mainly used to stimulate the pyrolysis gas of the incoming garbage. To buffer and secondary cooling effect.

Preferably, the cooling device 9 is composed of a stainless steel water tank and cooling water. The cooling water enters from the cooling water inlet 91 at the lower end and flows out from the cooling water outlet 92 at the upper end during the cooling process.

In one embodiment of the present invention, as shown in FIG. 9 , the hollow arrow in the figure indicates the flow direction of the blowback gas.

An elastic airbag 10 is provided on the communication pipeline between the buffer device 3 and the bidirectional peristaltic pump 4. When the bidirectional peristaltic pump 4 is opened in reverse, the elastic airbag 10 is used to generate high-pressure blowback gas.

When the solid particles on the filter element of the filter device 2 need to be blown back by the back blowing method, the two-way peristaltic pump 4 needs to be reversed to generate reverse gas. But there is a problem that the gas pressure is not enough, and the blowback effect is not good. In order to enhance the blowback effect, a peristaltic pump with higher power is required, which undoubtedly increases the equipment cost.

In the above scheme, an elastic airbag 10 is provided on the communication pipeline between the buffer device 3 and the bidirectional peristaltic pump 4 to generate high-pressure blowback gas

It should be noted that when starting back blowing, only the third on-off valve 63 is opened, the gas produced by the bidirectional peristaltic pump 4 enters the elastic airbag 10, and the elastic airbag 10 expands (as shown in Figure 9) . When the elastic airbag 10 is inflated to a certain limit, the fourth on-off valve 64 is opened. At this time, the blowback pipeline is communicated, and the elastic airbag 10 will generate high-pressure backflush gas, and the solid shell on the filter element 2 will be The body is blown back to the outside of the blowback pipe 8.

Another embodiment of the present invention also provides a method for on-line monitoring of high-temperature garbage pyrolysis gas, the method comprising the following steps:

Step S001: arrange the above-mentioned high-temperature garbage pyrolysis gas online monitoring system, so that all switch valves are in a closed state;

Step S002: open cooling device 9;

Step S003: Open the first on-off valve 61 and the second on-off valve 62, make the collection pipe 12 extend into the garbage pyrolysis gas pipeline 6, open the bidirectional peristaltic pump 4 in the forward direction, and perform on-line monitoring of the garbage pyrolysis gas;

Step S004: change the position of the collection tube relative to the fixed cylinder 11, and continue to perform on-line monitoring of the waste pyrolysis gas;

Step S005: Repeat step S004.

Through the online monitoring method of high-temperature waste pyrolysis gas, multi-point continuous automatic detection of different areas inside the pipeline can be realized, and the obtained results are closer to the actual working conditions.

Step S006: make all switch valves in closed state;

Step S007: open the third switching valve 63;

Step S008: reversely open the bidirectional peristaltic pump 4, so that the elastic airbag 10 is in a high-pressure expansion state;

Step S009: Open the fourth switching valve 64, and the high-pressure gas generated by the elastic airbag 10 in the high-pressure expansion state will blow the particles in the filter device 2 to the outside of the blowback pipe 8.

Through the online monitoring method of high-temperature garbage pyrolysis gas, the solid particles on the filter device 2 can be removed by using the principle of back-flushing; High-pressure blowback gas to improve the blowback effect.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims

An online monitoring system for high-temperature garbage pyrolysis gas, characterized in that it includes a multi-point gas collection device (1), a filter device (2), a buffer device (3), and a bidirectional peristaltic pump (4) connected in sequence by a communication pipeline , gas sensor (5);

The multi-point gas collection device (1) can extend into the garbage pyrolysis gas pipeline (6) to collect pyrolysis gas at multiple positions; the multi-point gas collection device (1) and the buffer device (3) A first switch valve (61) is provided on the communication pipeline between them, and the first switch valve (61) is used to open and close the connection between the multi-point gas collection device (1) and the buffer device (3). Connecting pipeline;

A second switching valve (62) is provided on the communication pipeline between the bidirectional peristaltic pump (4) and the gas sensor (5), and the second switching valve (62) is used to open and close the bidirectional peristaltic pump (4) A communication pipeline with the gas sensor (5).
An on-line monitoring system for high-temperature garbage pyrolysis gas according to claim 1, characterized in that, the garbage pyrolysis gas pipeline (6) is provided with a collection port (61), and the multi-point gas collection device (1 ) includes a fixed cylinder (11) and a collection tube (12), the collection tube (12) is at least partially housed in the fixed cylinder (11), and the fixed cylinder (11) is used for connecting with the collection port ( 61) Sealed connection, the collection tube (12) can move relative to the fixed cylinder (11) along the axial direction of the fixed cylinder (11).
The on-line monitoring system for high-temperature waste pyrolysis gas according to claim 2, characterized in that, the multi-point gas collection device (1) also includes a bellows (14), and the collection pipe (12) extends into the One end of the garbage pyrolysis gas pipeline (6) is a collection end (121), the other end is a movable end (122), and the end of the fixed cylinder (11) close to the garbage pyrolysis gas pipeline (6) is a fixed end (111), the other end is a sealing end (112);

One end of the bellows (14) is sealingly connected to the sealing end (112) of the fixed cylinder (11), and the other end of the bellows (14) is sealingly connected to the movable end of the collection tube (12). (122).
An online monitoring system for high-temperature waste pyrolysis gas as claimed in claim 3, characterized in that,

The inner wall of the fixing cylinder (11) is provided with a locking part (113), and the outer wall of the collection tube (12) is provided with an elastic locking body (123). When the cylinder (11) moves, the elastic locking body (123) can extend into the locking portion (113), so as to realize the position locking of the collection tube (12) relative to the fixed cylinder (11).
A kind of online monitoring system for pyrolysis gas of high-temperature garbage as claimed in claim 4, characterized in that, the gas inlet of the collection end (121) of the collection pipe (12) is an elastic collection port, and the elastic collection port is in the shape of " X" type, the size of the entrance area of the elastic collection port is inversely proportional to the flow rate of the waste pyrolysis gas.
An on-line monitoring system for high-temperature waste pyrolysis gas as claimed in claim 5, further comprising an air inlet pipe (7) and a blowback pipe (8);

The air intake pipe (7) is connected to the communication pipeline between the bidirectional peristaltic pump (4) and the second switch valve through a three-way pipe, and a third switch is provided at the entrance of the air intake pipe (7). valve (63);

The blowback pipe (8) is connected to the communication pipeline between the buffer device (3) and the first switch valve through a three-way pipe, and the outlet of the blowback pipe (8) is provided with a fourth switch valve (64).
An on-line monitoring system for high-temperature waste pyrolysis gas according to claim 6, characterized in that it also includes a cooling device (9), and the filtering device (2) and the buffer device (3) are accommodated in the in the cooling unit (9).
An online monitoring system for pyrolysis gas of high-temperature garbage according to claim 7, characterized in that an elastic air bag (10) is provided on the communication pipeline between the buffer device (3) and the bidirectional peristaltic pump (4), When the bidirectional peristaltic pump (4) is turned on in reverse, the elastic air bag (10) is used to generate high-pressure blowback gas.
A method for on-line monitoring of high-temperature garbage pyrolysis gas, characterized by comprising the following steps:

Step S001: Arranging the online monitoring system for pyrolysis gas of high-temperature waste as claimed in claim 8, so that all switch valves are in a closed state;

Step S002: Turn on the cooling device (9);

Step S003: Open the first on-off valve (61) and the second on-off valve (62), make the collection pipe (12) extend into the waste pyrolysis gas pipeline (6), and open the bidirectional peristaltic pump (4) in the forward direction , on-line monitoring of waste pyrolysis gas;

Step S004: changing the position of the collection tube (12) relative to the fixed cylinder (11), and continuing to monitor the garbage pyrolysis gas online;

Step S005: Repeat step S004.
An online monitoring method for high-temperature garbage pyrolysis gas according to claim 9, characterized in that it comprises the following steps:

Step S006: make all switch valves in closed state;

Step S007: Open the third switching valve (63);

Step S008: reversely turn on the bidirectional peristaltic pump (4), so that the elastic airbag (10) is in a high-pressure inflation state;

Step S009: Open the fourth switching valve (64), and the high-pressure gas generated by the elastic air bag (10) in the high-pressure expansion state blows the particles in the filter device (2) out of the blowback pipe (8).