A hybrid sampling measurement structure with built-in dust removal function and its working method

Abstract

The present invention provides a hybrid sampling and measuring structure with a self-ashing function and a working method thereof, comprising: a sampling chamber, one end of the sampling chamber is connected to a centrifugal ash removal chamber through a clean flue gas inlet, the other end of the sampling chamber is connected to a mixing device outlet, the centrifugal ash removal chamber is connected to a flue gas inlet, the negative pressure of the mixing device outlet is greater than the negative pressure of the flue gas inlet so that the flue gas after multiple ash removals can pass through the entire sampling chamber; the structure is simple and easy to operate, and dust in the flue gas can be removed during the measurement process, which not only makes the sampling and measurement of flue gas emitted by a coal-fired power plant more accurate, but also improves the measurement efficiency, so that the service life of the structure is significantly improved.

Description

Technical Field

[0001] The invention relates to the technical field of ash removal sampling and measurement in coal-fired power plants, and in particular to a mixed sampling and measurement structure with a self-contained ash removal function and a working method thereof. Background Art

[0002] With the increasingly stringent coal-fired emission standards, my country's coal-fired power plants generally install air preheaters and denitrification devices. The performance of the denitrification device directly affects the performance and service life of the downstream equipment of the boiler, so power plants will add various instruments for sampling tests to check the status and performance of various devices. The sampling device is currently mainly based on single-point sampling, and the flue gas taken is not representative enough, or the fly ash is large and easy to cause instrument blockage, resulting in errors in the test data. Secondly, some existing sampling devices require a large flue space and the instrument cannot be installed, affecting the performance of the equipment.

[0003] Existing sampling and testing equipment does not have the function of removing fly ash, which can easily cause the sampling probe to be blocked, affecting the measurement accuracy and efficiency, making it more difficult to control the power plant equipment, increasing the control cost and reducing the service life of downstream equipment. At the same time, there are relatively few sampling points in the sampling room, and some instruments cannot be installed, such as some imported optical ammonia analyzers (requires an optical distance of more than 750mm), instruments with long sampling probes that cannot be cut, etc., resulting in low accuracy and low efficiency of flue gas sampling and measurement of flue gas emissions from coal-fired power plants. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a hybrid sampling and measuring structure with built-in dust removal function and a working method thereof. The structure is simple and easy to operate, and the dust in the flue gas can be removed during the measurement process. This not only makes the sampling and measurement of flue gas emitted by coal-fired power plants more accurate, but also improves the measurement efficiency, thereby significantly improving the service life of the structure.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A hybrid sampling and measuring structure with built-in ash removal function comprises: a sampling chamber, one end of which is connected to a centrifugal ash removal chamber via a clean smoke inlet, the other end of which is connected to a mixing device outlet, the centrifugal ash removal chamber is connected to a smoke inlet, the negative pressure at the mixing device outlet is greater than the negative pressure at the smoke inlet so that the smoke after multiple ash removal passes through the entire sampling chamber.

[0007] The present invention provides a hybrid sampling and measuring structure with a built-in dust removal function and a working method thereof, which has a simple structure and is easy to operate, and can remove dust in the flue gas during the measurement process, which not only makes the sampling and measurement of the flue gas emitted by the coal-fired power plant more accurate, but also improves the measurement efficiency, so that the service life of the structure is significantly improved.

[0008] As a preferred technical solution, a plurality of ash collecting parts are provided along the outer circumference of the clean flue gas inlet, the side wall of the centrifugal ash removal chamber is connected to the ash collecting parts, and the ash collecting parts are connected to the outlet of the mixing device through an ash conveying pipe.

[0009] As a preferred technical solution, the sampling chamber includes: a sampling body piece and a sampling branch piece, the sampling branch pieces are relatively arranged on both sides of the sampling body piece, and one end of the sampling branch piece is connected to the sampling body piece.

[0010] As a preferred technical solution, the other end of the sampling branch is connected to a photometric instrument.

[0011] As a preferred technical solution, a purge gas inlet is relatively connected to the sampling branch piece, and the purge gas inlet is connected to a pneumatic valve.

[0012] As a preferred technical solution, the sampling body is provided with a plurality of spare sampling holes, and the spare sampling holes are used to connect a smoke measuring device.

[0013] As a preferred technical solution, it includes: at least two drainage tubes, which are arranged oppositely on both sides of the sampling object, one end of the drainage tube is connected to the sampling branch piece, and the other end of the drainage tube is connected to the outlet of the mixing device.

[0014] As a preferred technical solution, it includes: an extractable meter connected to one end of a centrifugal ash removal chamber, the extractable meter passes through the centrifugal ash removal chamber and the clean flue gas inlet in sequence and extends the sampling head of the extractable meter into the sampling chamber.

[0015] As a preferred technical solution, it includes: an ash collecting trough, which is connected to the other end of the centrifugal ash removal chamber through a sampling branch piece, and the ash collecting trough is relatively inclined along the sampling body piece.

[0016] The present invention provides a working method of a hybrid sampling and measuring structure with a self-contained dust removal function, comprising the following steps:

[0017] When working, the negative pressure at the outlet of the mixing device is greater than the negative pressure at the inlet of the flue gas, so that the measured flue gas flows in the entire structure, and a pressure difference is formed between the outlet of the mixing device and the centrifugal ash removal chamber;

[0018] The measuring flue gas is passed into the centrifugal ash removal chamber from the flue gas inlet, which is close to the side wall of the centrifugal ash removal chamber. The measuring flue gas is centrifugally rotated in the centrifugal ash removal chamber under the action of centrifugal force to separate the fly ash in the measuring flue gas to obtain the flue gas after fly ash removal. The separated fly ash continues to be centrifugally rotated along the side wall of the centrifugal ash removal chamber under the action of centrifugal force and enters the ash collecting part. The fly ash entering the ash collecting part is transported to the outlet of the mixing device through the ash conveying pipe and discharged;

[0019] After the flue gas after fly ash removal enters the sampling chamber through the clean flue gas inlet, the flue gas after fly ash removal is divided into multiple flue gases by utilizing the pressure difference between the outlet of the mixing device and the centrifugal ash removal chamber so that the flue gas after fly ash removal can pass through the entire structure. Multiple measuring instruments take samples and measure the flue gas after fly ash removal, and then the measured flue gas is discharged through the outlet of the mixing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A front view of a mixed sampling and measuring structure with a self-ash removal function provided by the present invention;

[0021] Figure 2 A rear view of the hybrid sampling and measuring structure with dust removal function provided by the present invention;

[0022] Figure 3 Front and side views of the mixed sampling and measuring structure with dust removal function provided by the present invention;

[0023] Figure 4 This is a disassembled front view of the hybrid sampling and measuring structure with a self-ash removal function provided by the present invention;

[0024] Figure 5 This is a disassembled right view of the hybrid sampling and measuring structure with a self-ash removal function provided by the present invention;

[0025] Among them: 1-sampling chamber; 2-clean flue gas inlet; 3-centrifugal ash removal chamber; 4-mixing device outlet; 5-flue gas inlet; 6-ash collecting parts; 7-ash conveying pipe; 8-sampling body parts; 9-sampling branch parts; 10-light-matching instrument; 11-purge gas inlet; 12-pneumatic valve; 13-spare sampling hole; 14-drainage pipe; 15-extraction instrument; 16-ash collecting trough; 17-flue gas after fly ash removal; 18-measurement flue gas. DETAILED DESCRIPTION

[0026] It should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] It can be understood that the present invention achieves the purpose of the present invention through some embodiments.

[0029] like Figure 1-3As shown, the mixed sampling and measuring structure with self-ashing function provided by the present invention comprises: a sampling chamber 1, one end of the sampling chamber 1 is connected to a centrifugal ash removal chamber 3 through a clean flue gas inlet 2, and the other end of the sampling chamber 1 is connected to a mixing device outlet 4, the centrifugal ash removal chamber 3 is connected to a flue gas inlet 5, and the outer circumference of the clean flue gas inlet is provided with two ash collecting parts 6 which are arranged oppositely, the side wall of the centrifugal ash removal chamber 3 is connected to the ash collecting part 6, and the ash collecting part 6 is connected to the mixing device outlet 4 through an ash conveying pipe 7, and the sampling chamber 1 comprises: a sampling body part 8 and a sampling branch part 9, and the sampling branch part 9 is arranged oppositely on both sides of the sampling body part 8 , and one end of the sampling branch member 9 is connected to the sampling body member 8, and the other end of the sampling branch member 9 is connected to a light-targeting instrument 10 with a longer light-targeting distance. A purge gas inlet 11 is relatively connected to the sampling branch member 9, and the purge gas inlet 11 is connected to a pneumatic valve 12. The pneumatic valve 12 is opened to control the purge gas entering the purge gas inlet 11 so as to purge dust from the sampling chamber 1. A plurality of spare sampling holes 13 are provided on the sampling body member 8, and the spare sampling holes 13 are used to connect a flue gas measuring device (not shown). The plurality of spare sampling holes 13 increase the measuring points, thereby improving the accuracy of flue gas measurement. The measuring device (not shown) is a photometric instrument, an extractable instrument or other measuring device with a short photometric distance. The drainage tube 14 is relatively arranged on both sides of the sampling object 8. One end of the drainage tube 14 is connected to the sampling branch member 9, and the other end of the drainage tube 14 is connected to the outlet 4 of the mixing device. The arrangement of the drainage tube 14 allows the flue gas to flow and mix fully in the sampling chamber 1, thereby improving the accuracy of various instruments in measuring flue gas. The extractable instrument 15 is connected to one end of the centrifugal ash removal chamber 3. The extractable instrument 15 passes through the centrifugal ash removal chamber 3 and the clean flue gas inlet 2 in turn, and extends the sampling head of the extractable instrument 15 into the sampling chamber 1 to collect the flue gas after ash removal. The flue gas is measured, the ash collecting trough 16 is connected to the other end of the centrifugal ash removal chamber 3 through the sampling branch part 9, and the ash collecting trough 16 is arranged relatively inclined along the sampling body part 8. The ash collecting trough 16 is arranged to collect the fine ash that cannot be removed by the centrifugal ash removal chamber 3, and then the collected fine ash falls into the mixing device outlet 4 for discharge. The arrangement of the ash collecting trough 16 further reduces the probability of the flue gas measuring device being blocked by the fine ash that cannot be removed by the centrifugal ash removal chamber 3, and further improves the service life of the structure. The negative pressure of the mixing device outlet 4 is greater than the negative pressure of the flue gas inlet 5 so that the flue gas after multiple ash removal passes through the entire sampling chamber 1. This structure allows both optical instruments and extraction instruments to be installed. The integration of various instruments on this structure not only increases the convenience of maintenance of coal-fired power plants, but also improves the accuracy of flue gas measurement.

[0030] like Figure 4-5As shown, the mixed sampling and measuring structure with built-in ash removal function provided by the present invention has a measuring smoke main pipe connected to the smoke inlet 5, so that the measuring smoke in the measuring smoke main pipe is transported into the smoke inlet 5, and the smoke inlet 5 is connected to the centrifugal ash removal chamber 3. The centrifugal ash removal chamber 3 adopts a conical structure, and a central opening at one end of the centrifugal ash removal chamber 3 is installed with an extraction instrument 15. The other end of the centrifugal ash removal chamber 3 is relatively connected with two ash collecting parts 6 for convenient ash transportation. The measuring smoke inlet 5 is close to the side wall of the centrifugal ash removal chamber 3. The measuring smoke is centrifugally rotated in the centrifugal ash removal chamber 3 under the action of centrifugal force to separate the fly ash in the measuring smoke to obtain the smoke after the fly ash is removed. The separated fly ash continues to be centrifugally rotated along the side wall of the centrifugal ash removal chamber 3 under the action of centrifugal force to enter the ash collecting part 6. The fly ash entering the ash collecting part 6 is transported to the mixing device through the ash conveying pipe 7. The clean flue gas inlet 2 adopts a conical cylindrical structure to increase the volume of the ash collecting part 6. The sampling branch 9 is relatively arranged on both sides of the sampling body 8, and one end of the sampling branch 9 is connected to the sampling body 8, and the other end of the sampling branch 9 is connected to the optical instrument 10 with a long optical distance. The sampling branch 9 is relatively connected with a purge gas inlet 11, and the purge gas inlet 11 is connected to the pneumatic valve 12. When the pneumatic valve 12 is opened, the purge gas introduced by the purge gas inlet 11 purges and removes ash in the sampling chamber 1, and the ash collecting trough 16 is symmetrically inclined along the vertical direction of the sampling body 8. The ash collecting trough 16 is arranged so that the fine ash that cannot be removed by the centrifugal ash removal chamber 3 is collected and the collected fine ash falls into the mixing device outlet 4 for discharge. The drainage pipe 14 allows a part of the flue gas to be transmitted from the two ends of the sampling branch 9 to the mixing device outlet 4, so that the flue gas sampling and measurement is more accurate. The ash conveying pipe 7 is used to connect the ash collecting part 6 and the outlet 4 of the mixing device, so as to facilitate the transportation of the fly ash collected in the ash collecting part 6 to the outlet 4 of the mixing device. Two pairs of spare sampling holes 13 are arranged opposite to each other in front and behind the sampling body 8. The spare sampling holes 13 are used to connect the flue gas measuring device (not shown). The spare sampling holes 13 are arranged to increase the flue gas measuring points and improve the accuracy of flue gas measurement.

[0031] The present invention provides a working method of a hybrid sampling and measuring structure with a self-contained dust removal function, comprising the following steps:

[0032] When working, the negative pressure at the outlet 4 of the mixing device is greater than the negative pressure at the flue gas inlet 5, so that the measured flue gas flows in the entire structure, and a pressure difference is formed between the outlet 4 of the mixing device and the centrifugal ash removal chamber 3;

[0033] The measuring flue gas is passed into the centrifugal ash removal chamber 3 from the flue gas inlet 5, which is close to the side wall of the centrifugal ash removal chamber 3. The measuring flue gas is centrifugally rotated in the centrifugal ash removal chamber 3 under the action of centrifugal force to separate the fly ash in the measuring flue gas to obtain the flue gas after fly ash removal. The separated fly ash continues to be centrifugally rotated along the side wall of the centrifugal ash removal chamber 3 under the action of centrifugal force and enters the ash collecting part 6. The fly ash entering the ash collecting part 6 is transported to the mixing device outlet 4 through the ash conveying pipe 7 and discharged;

[0034] After the flue gas after fly ash removal enters the sampling chamber 1 through the clean flue gas inlet 2, the flue gas after fly ash removal is divided into multiple flue gases by utilizing the pressure difference between the outlet 4 of the mixing device and the centrifugal ash removal chamber 3 so that the flue gas after fly ash removal can pass through the entire structure. Multiple measuring instruments sample and measure the flue gas after fly ash removal, and then the measured flue gas is discharged through the outlet of the mixing device.

[0035] like Figure 1-3 As shown, the mixed sampling and measuring structure with built-in ash removal function provided by the present invention, before operation, the smoke inlet 5 is connected to the smoke main pipe, the centrifugal ash removal chamber 3 is connected to the sampling chamber 1 through the clean smoke inlet 2, the side wall of the centrifugal ash removal chamber 3 is connected to the ash collecting part 6, the ash collecting part 6 is connected to the mixing device outlet 4 through the ash conveying pipe 7, all connecting parts are sealed to ensure that the entire structure is leak-proof, the pneumatic valve 12 is closed, the extractable meter 15 is installed on the centrifugal ash removal chamber 3, the sampling head of the extractable meter 15 is extended into the sampling chamber 1, the optical meter 10 with a longer optical distance is respectively installed on the two ends of the upper sampling branch member 9, the optical meter with a shorter optical distance or the extractable meter with a shorter sampling rod is installed on the spare sampling hole 13, and the sampling head of the optical meter with a shorter optical distance or the extractable meter with a shorter sampling rod is extended into the sampling chamber 1 to sample and measure the smoke.

[0036] When working, the negative pressure at the outlet 4 of the mixing device is greater than the negative pressure at the flue gas inlet 5, so that the measured flue gas flows in the entire structure, and a pressure difference is formed between the outlet 4 of the mixing device and the centrifugal ash removal chamber 3;

[0037] The measuring flue gas 18 is passed into the centrifugal ash removal chamber 3 from the flue gas inlet 5, which is close to the side wall of the centrifugal ash removal chamber 3. The measuring flue gas is centrifugally rotated in the centrifugal ash removal chamber 3 under the action of centrifugal force to separate the fly ash in the measuring flue gas to obtain the flue gas 17 after fly ash removal. The separated fly ash continues to be centrifugally rotated along the side wall of the centrifugal ash removal chamber 3 under the action of centrifugal force and enters the ash collecting part 6. The fly ash entering the ash collecting part 6 is transported to the outlet 4 of the mixing device through the ash conveying pipe 7 and discharged.

[0038] After the flue gas after fly ash removal enters the sampling chamber 1 through the clean flue gas inlet 2, the flue gas after fly ash removal is divided into multiple flue gases by using the pressure difference between the mixing device outlet 4 and the centrifugal ash removal chamber 3 so that the multiple flue gases can pass through the entire structure. Multiple measuring instruments sample and measure the flue gas 17 after fly ash removal, and then the measured flue gas is discharged through the mixing device outlet 4. One of the multiple flue gases flows along the sampling object 8 to the mixing device outlet 4, two of the multiple flue gases flow along the drainage pipe 14 to the mixing device outlet 4, and two of the multiple flue gases flow along the ash collecting tank 16 to the mixing device outlet 4. According to the principle of pressure balance, the five flue gases in the multiple flue gases can all pass through, ensuring that the flue gas in the entire sampling chamber 1 is fully circulated without dead ends, thereby ensuring the accuracy of flue gas measurement by various instruments and the convenience of structural maintenance. The pneumatic valve 12 is opened or closed according to the ash content, and the purge gas inlet 11 and the pneumatic valve 12 cooperate with each other to purge the dust in the sampling chamber 1.

[0039] The present invention provides a hybrid sampling and measuring structure with a built-in dust removal function and a working method thereof, which has a simple structure and is easy to operate, and can remove dust in the flue gas during the measurement process, which not only makes the sampling and measurement of the flue gas emitted by the coal-fired power plant more accurate, but also improves the measurement efficiency, so that the service life of the structure is significantly improved.

[0040] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all various changes or equivalent substitutions falling within the scope of the claims of the present application are included. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope protected by the present invention.

Claims

1. A hybrid sampling and measuring structure with built-in dust removal function, characterized in that: include: The ash collecting trough is a pipe having a plurality of pipes and a plurality of pipes connected to the centrifugal ash collecting chamber, wherein the pipes have a plurality of pipes and a plurality of pipes connected to the centrifugal ash collecting chamber. The pipes have a plurality of pipes and a plurality of pipes connected to the centrifugal ash collecting chamber. The pipes have a plurality of pipes and a plurality of pipes connected to the centrifugal ash collecting chamber. The pipes have a plurality of pipes and a plurality of pipes connected to the centrifugal ash collecting chamber. One path of flue gas flows along the sampling body to the outlet of the mixing device, two paths of flue gas after multi-path ash removal flow along the drainage pipe to the outlet of the mixing device respectively, and two paths of flue gas after multi-path ash removal flow along the ash collecting trough to the outlet of the mixing device respectively; the drainage pipes are relatively arranged on both sides of the sampling body, one end of the drainage pipe is connected to the sampling branch piece, and the other end of the drainage pipe is connected to the outlet of the mixing device, the ash collecting trough is connected to the other end of the centrifugal ash removal chamber through the sampling branch piece, and the ash collecting trough is relatively inclined along the sampling body; a plurality of ash collecting parts are arranged along the outer circumference of the clean flue gas inlet, the side wall of the centrifugal ash removal chamber is connected to the ash collecting part, and the ash collecting part is connected to the outlet of the mixing device through the ash conveying pipe.

2. The hybrid sampling and measuring structure with dust removal function according to claim 1 is characterized in that: The sampling branch pieces are arranged oppositely at two sides of the sampling body piece, and one end of the sampling branch piece is connected to the sampling body piece.

3. The hybrid sampling and measuring structure with dust removal function according to claim 2 is characterized in that: The other end of the sampling branch piece is connected to a light-matching instrument.

4. The hybrid sampling and measuring structure with dust removal function according to claim 2, characterized in that: A purge gas inlet is relatively connected to the sampling branch piece, and the purge gas inlet is connected to the pneumatic valve.

5. The hybrid sampling and measuring structure with self-ash removal function according to claim 2, characterized in that: The sampling body is provided with a plurality of spare sampling holes, and the spare sampling holes are used to connect a smoke measuring device.

6. The hybrid sampling and measuring structure with dust removal function according to claim 2, characterized in that: include: An extractable meter is connected to one end of the centrifugal ash removal chamber.

7. The working method of the hybrid sampling and measuring structure with dust removal function according to any one of claims 1 to 6, characterized in that: The following steps are involved: When working, the negative pressure at the outlet of the mixing device is greater than the negative pressure at the inlet of the flue gas, so that the measured flue gas flows in the entire structure, and a pressure difference is formed between the outlet of the mixing device and the centrifugal ash removal chamber; The measuring flue gas is passed into the centrifugal ash removal chamber from the flue gas inlet, which is close to the side wall of the centrifugal ash removal chamber. The measuring flue gas is centrifugally rotated in the centrifugal ash removal chamber under the action of centrifugal force to separate the fly ash in the measuring flue gas to obtain the flue gas after fly ash removal. The separated fly ash continues to be centrifugally rotated along the side wall of the centrifugal ash removal chamber under the action of centrifugal force and enters the ash collecting part. The fly ash entering the ash collecting part is transported to the outlet of the mixing device through the ash conveying pipe and discharged; After the flue gas after fly ash removal enters the sampling chamber through the clean flue gas inlet, the flue gas after fly ash removal is divided into multiple flue gases by utilizing the pressure difference between the outlet of the mixing device and the centrifugal ash removal chamber so that the flue gas after fly ash removal can pass through the entire structure. Multiple measuring instruments sample and measure the flue gas after fly ash removal, and then the measured flue gas is discharged through the outlet of the mixing device.

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