Air pre-heater air leakage rate measuring device based on wireless detection technology

Abstract

The utility model discloses an air pre-heater air leakage rate measuring device based on wireless detection technology, which comprises a plurality of flue gas sampling holes arranged on the surface of a partition plate in a flue gas outlet of an air pre-heater according to a grid method, negative pressure sampling boxes are fixedly arranged at the positions of the measuring holes, the upper end of a sampling pipe is communicated and connected with a chamber at the corresponding position through a flue gas inlet pipe, and the lower end of the sampling pipe is communicated and connected with the flue gas inlet pipe. The chamber is communicated and connected with a negative pressure sampling box at a corresponding position through a smoke outlet pipe, a wireless oxygen sensor is fixedly mounted at the upper part of the negative pressure sampling box, and a smoke adjusting mechanism is mounted at the lower part of the negative pressure sampling box. The negative pressure sampling box is vacuumized, when smoke needs to be detected, the smoke adjusting mechanism is separated from the stepped hole, at the moment, the stepped hole and the air inlet hole are exposed, smoke in the smoke sampling hole of the smoke outlet of the air pre-heater enters the negative pressure sampling box through the smoke outlet pipe, and then the oxygen content in the smoke can be detected through the wireless oxygen sensor. The oxygen content of multiple measuring points can be measured at the same time, measuring point data can be synchronized, and the accuracy of the air leakage rate of the air pre-heater is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air preheater detection equipment technical field, more specifically, especially relates to a kind of air preheater air leakage rate measuring device based on wireless detection technology BACKGROUND

[0002] At present, coal-fired unit air preheater is only installed oxygen measuring point at inlet, and usually no oxygen measuring point is installed at outlet. In order to detect air preheater air leakage rate, power plant carries out air leakage rate test every quarter according to boiler thermal test regulation and thermal power unit energy saving technology supervision standard. According to the regulation, smoke sampling measuring points should be installed at inlet and outlet of air preheater according to grid method, and oxygen measurement is carried out on data of each measuring point at inlet and outlet of air preheater. Air preheater air leakage rate is calculated according to oxygen measurement data. Power plant usually uses purchased oxygen analyzer (or smoke analyzer) to measure oxygen of each measuring point one by one. Due to reasons such as different data of many measuring points, large load fluctuation and the like, air preheater air leakage rate measured is inaccurate, which cannot effectively guide air preheater air leakage treatment work. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a kind of air preheater air leakage rate measuring device based on wireless detection technology.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme: a kind of air preheater air leakage rate measuring device based on wireless detection technology, including baffle arranged in air preheater flue gas outlet, further including multiple sampling tubes, the surface of baffle is provided with multiple flue gas sampling holes according to grid method, the outer surface of air preheater flue gas outlet is uniformly provided with multiple measuring holes, negative pressure sampling box is fixedly installed at the position of measuring hole, the surface of baffle is fixedly installed with mixing bin, multiple sampling tubes are fixedly installed in flue gas sampling hole separately, the inside of mixing bin is uniformly provided with the same number of cavities as negative pressure sampling box, the upper end of sampling tube is connected with corresponding position cavity through smoke inlet pipe, the cavity is connected with corresponding position negative pressure sampling box through smoke outlet pipe, wireless oxygen sensor is fixedly installed on the upper part of negative pressure sampling box, and smoke adjusting mechanism is installed on the lower part of negative pressure sampling box, and smoke adjusting mechanism is used to control the closure of corresponding smoke outlet pipe.

[0005] Preferably, one-way exhaust hole is arranged at the upper end position outside negative pressure sampling box.

[0006] Preferably, sleeve is fixedly installed in negative pressure sampling box, one end of sleeve is connected with corresponding smoke outlet pipe, step hole is arranged in the middle of sleeve, and air inlet hole is arranged at one end of sleeve close to smoke adjusting mechanism.

[0007] Preferably, the flue gas adjusting mechanism comprises a knob bolt and a piston, the piston is inserted into the sleeve, and the piston is used for closing the stepped hole; the outer surface of the negative pressure sampling box is provided with a threaded hole communicating with the sleeve; the knob bolt is connected with the threaded hole in a matched mode, and one end of the knob bolt is fixedly connected with the piston.

[0008] Preferably, the data detected by the wireless oxygen sensor is sent through a multi-path wireless transceiver.

[0009] Compared with the prior art, the air preheater air leakage rate measuring device has the following advantages:

[0010] The air preheater air leakage rate measuring device has the following advantages: the negative pressure sampling box is extracted to vacuum, when flue gas needs to be detected, the flue gas adjusting mechanism is separated from the stepped hole, at the moment, the stepped hole and the recent hole are exposed, the flue gas in the flue gas sampling hole of the flue gas outlet of the air preheater passes through the smoke outlet pipe and enters the negative pressure sampling box, and then the oxygen content in the flue gas can be detected through the wireless oxygen sensor, multiple measuring points can be measured simultaneously, the synchronous measuring point data can be measured, and the accuracy of the air preheater air leakage rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0012] Fig. 1 is a perspective view of an air preheater air leakage rate measuring device based on wireless detection technology according to the present application;

[0013] Fig. 2 is a sectional view of an air preheater air leakage rate measuring device based on wireless detection technology according to the present application;

[0014] Fig. 3 is a sectional view of a negative pressure sampling box according to the present application.

[0015] In the drawings: 1, air preheater flue gas outlet; 2, baffle; 21, flue gas sampling hole; 3, mixing bin; 31, smoke inlet pipe; 32, smoke outlet pipe; 4, sampling pipe; 5, negative pressure sampling box; 51, one-way exhaust hole; 52, sleeve; 53, stepped hole; 54, air inlet hole; 6, wireless oxygen sensor; 7, flue gas adjusting mechanism; 71, knob bolt; 72, piston. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0017] See Figs. 1-3 As shown, this utility model provides an air preheater leakage rate measurement device based on wireless detection technology. The device includes a partition 2 arranged in the flue gas outlet 1 of the air preheater, and multiple sampling tubes 4. The surface of the partition 2 is provided with multiple flue gas sampling holes 21 in a grid pattern. Multiple measuring holes are uniformly provided on the outer surface of the flue gas outlet 1 of the air preheater. A negative pressure sampling box 5 is fixedly installed at each measuring hole position. A mixing chamber 3 is fixedly installed on the surface of the partition 2. Multiple sampling tubes 4 are individually fixedly installed in the flue gas sampling holes 21. The mixing chamber 3 is uniformly provided with a number of chambers that are the same as the number of negative pressure sampling boxes 5. The upper end of the sampling tube 4 is connected to the corresponding chamber through the inlet pipe 31. The chamber is connected to the corresponding negative pressure sampling box 5 through the outlet pipe 32. A wireless oxygen sensor 6 is fixedly installed on the upper part of the negative pressure sampling box 5, and a flue gas regulating mechanism 7 is installed on the lower part of the negative pressure sampling box 5. The flue gas regulating mechanism 7 is used to control the closure of the corresponding outlet pipe 32.

[0018] In this embodiment, a one-way exhaust hole 51 is provided at the upper outer side of the negative pressure sampling box 5 to prevent gas backflow, thereby facilitating the vacuum pump to perform vacuuming and gas extraction on the negative pressure sampling box 5.

[0019] In this embodiment, a sleeve 52 is fixedly installed inside the negative pressure sampling box 5. One end of the sleeve 52 is connected to the corresponding smoke outlet pipe 32. A stepped hole 53 is provided in the middle of the sleeve 52. An air inlet hole 54 is provided at one end of the sleeve 52 near the smoke regulating mechanism 7 for smoke to enter the negative pressure sampling box 5.

[0020] In this embodiment, the flue gas regulating mechanism 7 includes a knob bolt 71 and a piston 72. The piston 72 is inserted inside the sleeve 52 and is used to close the stepped hole 53. The outer surface of the negative pressure sampling box 5 has a threaded hole that connects to the sleeve 52. The knob bolt 71 is connected to the threaded hole, and one end of the knob bolt 71 is fixedly connected to the piston 72.

[0021] In this embodiment, the data detected by the wireless oxygen sensor 6 is transmitted through a multi-channel wireless transceiver to a flue gas analysis system in the prior art for flue gas analysis, thereby improving the efficiency of data calculation and analysis.

[0022] The specific operation steps are as follows: the air rate measuring device on the flue gas outlet of the air preheater can also be arranged on the flue gas inlet of the air preheater, a one-way exhaust hole 51 is inserted through a gas suction pump, the negative pressure sampling box 5 is extracted to vacuum, when it is necessary to detect flue gas, the knob bolt 71 is rotated to make the piston 72 separate from the stepped hole 53, at this time the piston 72 exposes the stepped hole 53 and the recent hole 54, the flue gas in the flue gas sampling hole 21 of the flue gas outlet 1 of the air preheater will enter the negative pressure sampling box 5 through the flue gas outlet pipe 31, and then the oxygen content in the flue gas can be detected through the wireless oxygen sensor 6.

[0023] Although the embodiments of the present application are described in conjunction with the drawings, the patent owner can make various modifications or modifications within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present application, they should be within the protection scope of the present application.

Claims

1. A device for measuring the air leakage rate of an air preheater based on the wireless detection technology, comprising a partition arranged in the flue gas outlet of the air preheater, characterized in that: Also include a plurality of sampling tubes, the partition surface is provided with a plurality of flue gas sampling holes in a grid method, the air preheater flue gas outlet surface is uniformly provided with a plurality of measuring holes, measuring hole position is fixedly installed with negative pressure sampling box, the partition surface is fixedly installed with mixing bin, a plurality of the sampling tube is separately fixedly installed in the flue gas sampling hole, the mixing bin inside is uniformly provided with the same number of cavities as the negative pressure sampling box, the sampling tube upper end is connected with the corresponding position cavity through the smoke pipe, the cavity is connected with the corresponding position negative pressure sampling box through the smoke pipe, the negative pressure sampling box upper portion is fixedly installed with wireless oxygen sensor, and the negative pressure sampling box lower portion is installed with flue gas adjusting mechanism, and the flue gas adjusting mechanism is used for controlling the closure of the corresponding smoke pipe.

2. The device for measuring the air leakage rate of an air preheater based on wireless detection technology according to claim 1, characterized in that: The outer side of the negative pressure sampling box is provided with a one-way exhaust hole at the upper end position.

3. The device for measuring the air leakage rate of an air preheater based on wireless detection technology according to claim 2, characterized in that: The negative pressure sampling box is fixedly installed with a sleeve inside, one end of the sleeve is connected with the corresponding smoke pipe, the middle part of the sleeve is provided with a stepped hole, and one end of the sleeve close to the flue gas adjusting mechanism is provided with an air inlet hole.

4. The device for measuring the air leakage rate of an air preheater based on wireless detection technology according to claim 3, characterized in that: The flue gas adjusting mechanism includes a knob bolt and a piston, the piston is inserted into the sleeve, the piston is used for closing the stepped hole, the outer side surface of the negative pressure sampling box is provided with a threaded hole connected with the sleeve, the knob bolt is connected with the threaded hole, and one end of the knob bolt is fixedly connected with the piston.

5. The device for measuring the air leakage rate of an air preheater based on wireless detection technology according to claim 1, characterized in that: The data detected by the wireless oxygen sensor is sent through a plurality of wireless transceivers.

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