CN217878522U

CN217878522U - Anti-blocking sampler for boiler

Info

Publication number: CN217878522U
Application number: CN202221509482.XU
Authority: CN
Inventors: 王宏
Original assignee: Shanxi Luneng Hequ Power Generation Co Ltd; National Energy Group Guoyuan Power Co Ltd
Current assignee: Shanxi Luneng Hequ Power Generation Co Ltd; National Energy Group Guoyuan Power Co Ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-11-22
Anticipated expiration: 2032-06-15

Abstract

The utility model relates to a stifled sampler is prevented to boiler includes: the sampling tube is provided with a pressure measuring device; the air flow adjusting assembly is provided with an air inlet communicated with an air source and an air outlet communicated with the air inlet end of the sampling tube, so that the pressure of the air flow blown into the sampling tube is greater than the measured pressure of the sampling tube; and a pressure compensation device, wherein the compensation pressure can be automatically adjusted and arranged on the sampling pipe to eliminate the differential pressure in the sampling pipe. The air flow adjusting assembly disclosed by the invention blows air flow with higher pressure into the sampling tube so as to blow dust at the measuring point of the pressure measuring device, and the air flow with higher pressure can generate back-blowing scavenging air flow in the sampling tube so as to generate differential pressure, so that the differential pressure generated by the back-blowing air flow is eliminated through the pressure compensating device so as to ensure a real measuring value, not only can the measuring point of the pressure measuring device be prevented from being blocked, but also the accuracy of a measuring result can be ensured.

Description

Anti-blocking sampler for boiler

Technical Field

The utility model relates to a pressure measurement technical field specifically relates to a stifled sampler is prevented to boiler.

Background

At present, the conventional anti-blocking sampler (a three-layer anti-blocking mechanism is arranged inside), a self-cleaning ash (static pressure and dynamic pressure) sampler, a continuous purging anti-blocking device and the like are generally adopted for anti-blocking sampling of most thermal power plants. Although these devices have some effect on the anti-jamming pressure, they are not obvious and often jam. Especially, a fluidized bed boiler is easy to block, the combustion in a hearth of the fluidized bed boiler utilizes strong wind flow to make materials flow to fully combust, the vulcanization condition in the hearth is an important operating parameter, but the flowing materials are easy to block a conventional anti-blocking sampler, negative influence is brought to the safe operation of the boiler, and the safe and stable operation of a unit is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a stifled sampler is prevented to boiler, this stifled sampler is prevented to boiler can prevent pressure measurement device's measurement station department from blockking up, can guarantee the accuracy of measuring result again.

In order to achieve the above object, the present disclosure provides a boiler anti-blocking sampler, comprising: the sampling tube is provided with a pressure measuring device; the gas flow regulating assembly is provided with a gas inlet communicated with a gas source and a gas outlet communicated with the gas inlet end of the sampling tube, so that the pressure of gas flow blown into the sampling tube is greater than the measured pressure of the sampling tube; and a pressure compensation device, wherein the compensation pressure can be automatically adjusted and arranged on the sampling pipe to eliminate the differential pressure in the sampling pipe.

Optionally, the pressure compensation device includes a controllable stop valve, on which three flow-controllable valve ports are provided, and the three valve ports are respectively communicated with the air outlet of the airflow adjusting assembly, the air inlet of the sampling tube and the pressure measurement device.

Optionally, the pressure compensation device further includes a controller and pressure sensors respectively disposed at the three valve ports, and the three pressure sensors and the controllable stop valve are electrically connected to the controller so as to make the pressures of the three valve ports the same under the control of the controller.

Optionally, the controllable shut-off valve is configured as a three-way regulating valve.

Optionally, the gas flow regulating assembly comprises a regulating valve, a pressure gauge and a flow meter connected in series, so that the gas flow entering the sampling tube is a constant-pressure and constant-flow gas flow.

Optionally, the flow meter is configured as a glass rotameter.

Optionally, the boiler anti-clogging sampler further comprises a filter disposed at the air inlet of the air flow regulating assembly.

Optionally, the boiler anti-blocking sampler further comprises a gas-water separator disposed at the gas outlet of the gas flow regulating assembly.

Optionally, the boiler prevents that stifled sampler still includes permanent air current control box and deareator, the air current adjusting part with deareator all sets up in the permanent air current control box, the bottom of permanent air current control box is equipped with and is used for discharging deareator goes out the outlet of water.

Optionally, the pressure measurement device comprises a measurement tube in communication with the pressure compensation device and a transmitter in communication with the measurement tube.

Through the technical scheme, the airflow adjusting assembly blows the airflow with high pressure into the sampling pipe to blow dust at the measuring point of the pressure measuring device, and the airflow with high pressure can generate back-blowing scavenging airflow in the sampling pipe to generate differential pressure, so that the differential pressure generated by the back-blowing airflow is eliminated through the pressure compensating device, a real measuring value is ensured, the measuring point of the pressure measuring device can be prevented from being blocked, and the accuracy of a measuring result can be ensured.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic structural diagram of an anti-clogging sampler for a boiler according to the present disclosure;

FIG. 2 is a schematic structural diagram of a pressure compensating device according to the present disclosure;

fig. 3 is a system connection diagram of a pressure compensating device according to the present disclosure.

Description of the reference numerals

1. A sampling tube; 2. a pressure compensation device; 21. a controllable stop valve; 22. a valve port; 23. a pressure sensor; 24. a controller; 3. a pressure measuring device; 31. a measurement tube; 32. a transmitter; 4. a filter; 5. a gas flow regulating assembly; 51. a pressure gauge; 52. adjusting a valve; 53. a flow meter; 6. a constant air flow control box; 7. an air inlet; 8. an air outlet; 9. a gas-water separator; 10. and a water outlet.

Detailed Description

The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In this disclosure, unless specified to the contrary, use of directional words such as "upper, lower, top, bottom" generally refer to the orientation of FIG. 1, and "inner and outer" refer to the inner and outer relative to the profile of the component or structure itself. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.

As shown in fig. 1-3, the present disclosure provides a boiler anti-clogging sampler comprising: a sampling tube 1 provided with a pressure measuring device 3, one end of the sampling tube 1 extending into the boiler, and measuring the pressure in the boiler by measuring the pressure of the sampling tube 1; the air flow adjusting component 5 is provided with an air inlet 7 communicated with an air source and an air outlet 8 communicated with the air inlet end of the sampling tube 1, so that the pressure of the air flow blown into the sampling tube 1 is greater than the measured pressure of the sampling tube 1; and a pressure compensating means 2, a compensating pressure being automatically adjustably provided on the sampling tube 1 to eliminate a differential pressure inside the sampling tube 1.

The air flow adjusting assembly 5 disclosed by the invention blows air flow with high pressure into the sampling tube 1 so as to blow dust at the measuring point of the pressure measuring device 3, and the air flow with high pressure can generate reverse blowing air flow in the sampling tube 1 so as to generate differential pressure, so that the differential pressure generated by the reverse blowing air flow is eliminated through the pressure compensating device 2 so as to ensure a real measuring value, not only can the measuring point of the pressure measuring device 3 be prevented from being blocked, but also the accuracy of a measuring result can be ensured.

As an alternative embodiment, as shown in fig. 2-3, the pressure compensation device 2 includes a controllable stop valve 21, on which three flow-controllable valve ports 22 are provided, the three valve ports 22 are respectively communicated with the air outlet 8 of the air flow adjusting assembly 5, the air inlet end of the sampling pipe 1 and the pressure measurement device 3, and the flow and pressure of the three valve ports 22 are controlled through the three flow-controllable valve ports 22, so that the pressure compensation device 2 can counteract the differential pressure inside the sampling pipe 1.

Optionally, the pressure compensation device 2 further includes a controller 24 and pressure sensors 23 respectively disposed at the three valve ports 22, the three pressure sensors 23 and the controllable stop valve 21 are electrically connected to the controller 24 to make the pressures of the three valve ports 22 the same under the control of the controller 24, for example, the controller 24 is a single chip, the pressure sensors 23 detect the pressures at the three valve ports 22 and send signals to the controller 24, and the controller 24 controls the controllable stop valve 21 to adjust the opening and closing size of the valve ports 22.

Between a sampling point A of a transmitter 32 port and a purging pipe port B, the pressure difference in the pipe generated by the gas flow is delta P, the gravity of the flowing gas is gamma, the air flow velocity of the section is V, the air resistance parameter of the pipeline is zeta, the pressure of the point A is PA, the pressure of the point B is PB,

then Δ P = γ ² /2g PA＝PB+ΔP

It can be seen from the formula that the gas flow rate changes and Δ P changes due to pressure changes. In the conventional purging method, only a small flow can be selected for ensuring the measurement accuracy, so that blockage and burning are easily caused, if the flow is increased, the transmitter 32 needs to generate zero offset, and at the moment, only a method of zero setting of the transmitter 32 and a display instrument needs to be adopted, so that the display system is disordered, and problems in operation are difficult to correct; faults and deviations of the pressure regulating valve and the flow controller directly influence the measurement accuracy, and the daily maintenance workload is quite large. When the pressure compensation device 2 cancels the pressure difference Δ P in the pipe, the pressure at point a is equal to the pressure at point B, i.e., PA = PB, and then the pressure at sampling point a is the pressure in the boiler.

The controllable stop valve 21 is a three-way regulating valve, and the controller 24 controls the opening and closing of the three valve ports 22 of the three-way regulating valve to control the flow and pressure of the three valve ports 22.

As an alternative embodiment, as shown in fig. 1, the air flow regulating assembly 5 includes a regulating valve 52, a pressure gauge 51 and a flow meter 53 connected in series, the flow rate and pressure of the incoming air flow are measured by the pressure gauge 51 and the flow meter 53 respectively, and then are regulated by the regulating valve 52, so that the air flow entering the sampling tube 1 is a constant pressure and constant flow air flow, the stability of flow control output is ensured, and the normal operation of the detection device can be ensured. In other embodiments, the airflow regulating assembly 5 may also be an air supply triple, that is, three air supply processing elements, namely an air filter, a pressure reducing valve and an oil atomizer, are assembled together to purify, filter and reduce the airflow to the rated air supply pressure of the instrument supply, which is equivalent to the function of a power transformer in the circuit.

The flow meter 53 can be any type of flow meter, and only the flow rate of the airflow needs to be measured, and in the present disclosure, the flow meter 53 is configured as a glass rotameter. The main measuring elements of the glass rotameter are a vertically installed conical glass tube with small lower part and large upper part and a float which can move up and down in the glass rotameter, when fluid passes through the conical glass tube from bottom to top, a pressure difference is generated between the upper part and the lower part of the float, and the float rises under the action of the pressure difference.

As an alternative embodiment, as shown in fig. 1, the boiler anti-blocking sampler further includes a filter 4 disposed at the air inlet 7 of the air flow adjusting assembly 5, and the filter 4 may be a filtering net or other filtering device for filtering impurities in the air flow entering the boiler anti-blocking sampler, so as to ensure the boiler anti-blocking sampler to operate normally.

As an alternative embodiment, as shown in FIG. 1, the boiler anti-clogging sampler further comprises a gas-water separator 9 disposed at the gas outlet 8 of the gas flow regulating assembly 5 for separating water from the gas flow to ensure the normal operation of the boiler anti-clogging sampler.

As an optional implementation, as shown in fig. 1, the boiler anti-blocking sampler further includes a constant airflow control box 6 and an air-water separator 9, the airflow adjusting component 5 and the air-water separator 9 are both disposed in the constant airflow control box 6, on one hand, the constant airflow control box 6 can be integrally mounted and is convenient to transport, on the other hand, the constant airflow control box 6 can also protect internal components, and a water outlet 10 for discharging water from the air-water separator 9 is disposed at the bottom of the constant airflow control box 6 to discharge water generated by the air-water separator 9. In other embodiments, a water outlet of the gas-water separator 9 may be provided with a water drain pipe, and an outlet of the water drain pipe extends out of the constant air flow control box 6.

As an alternative embodiment, as shown in fig. 1-2, the pressure measuring device 3 comprises a measuring tube 31 communicating with the pressure compensating device 2 and a transmitter 32 communicating with the measuring tube 31, the transmitter 32 measures physical quantities such as temperature, pressure, liquid level, composition, etc. and converts them into a unified standard signal, which is used for measuring pressure in the present disclosure, and the measuring tube 31 communicates with one of the valve ports 22 of the pressure compensating device 2. In other embodiments, transmitter 32 can also be a pressure sensor.

The measurement principle of the device is that the measurement point is blocked by using a method of continuously ventilating in the measurement point, and the differential pressure generated by the pressure of back flushing air is eliminated by using a dynamic pressure compensation method of hydrodynamics to ensure a real measurement value, which is the biggest characteristic of the compensation type wind pressure measurement blocking-resistant blowing device. During actual use, the air inlet 7 of the air flow adjusting assembly 5 is communicated with an air source, the air source can be an air pump, the air flow is adjusted in flow and pressure through the air flow adjusting assembly 5 to enable the air flow to be constant-pressure and constant-flow air flow, the air flow is filtered through the filter 4 and subjected to air-water separation through the air-water separator 9, the air flow with high pressure is blown into the sampling pipe 1 to purge dust at the measuring point of the pressure measuring device 3, differential pressure generated due to high air flow pressure is eliminated through the pressure compensating device 2 to ensure a real measuring value, the blocking at the measuring point of the pressure measuring device 3 can be prevented, and the accuracy of the measuring result can be ensured.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A boiler anti-blocking sampler is characterized by comprising:

the sampling tube is provided with a pressure measuring device;

the air flow adjusting assembly is provided with an air inlet communicated with an air source and an air outlet communicated with the air inlet end of the sampling tube, so that the pressure of the air flow blown into the sampling tube is greater than the measured pressure of the sampling tube; and

a pressure compensation device, wherein the compensation pressure can be automatically adjusted and arranged on the sampling pipe to eliminate the differential pressure in the sampling pipe.

2. The anti-clogging sampler of claim 1, wherein the pressure compensation device comprises a controllable stop valve having three flow-controllable ports, and the three ports are respectively connected to the gas outlet of the gas flow regulating assembly, the gas inlet of the sampling tube and the pressure measuring device.

3. The boiler anti-clogging sampler according to claim 2, wherein the pressure compensation device further comprises a controller and pressure sensors respectively disposed at the three valve ports, and the three pressure sensors and the controllable shutoff valves are electrically connected to the controller to make the pressures of the three valve ports the same under the control of the controller.

4. The boiler anti-clogging sampler of claim 2, wherein the controllable shut-off valve is configured as a three-way regulating valve.

5. The anti-clogging sampler of a boiler according to claim 1, wherein the gas flow regulating assembly comprises a regulating valve, a pressure gauge and a flow meter connected in series so that the gas flow entering the sampling tube is a gas flow with constant pressure and constant flow.

6. The boiler anti-clogging sampler of claim 5, wherein the flow meter is configured as a glass rotameter.

7. The anti-clogging sampler for a boiler according to claim 1, further comprising a filter disposed at the air inlet of the air flow regulating assembly.

8. The boiler anti-clogging sampler according to claim 1, further comprising a gas-water separator provided at the gas outlet of the gas flow regulating assembly.

9. The anti-clogging sampler for the boiler according to claim 1, further comprising a constant air flow control box and an air-water separator, wherein the air flow regulating assembly and the air-water separator are both arranged in the constant air flow control box, and a water outlet for discharging the water discharged from the air-water separator is arranged at the bottom of the constant air flow control box.

10. The boiler anti-clogging sampler of claim 1, wherein the pressure measuring device comprises a measuring tube in communication with the pressure compensating device and a transmitter in communication with the measuring tube.