Air volume sampling pipeline anti-blocking device for boiler hot air duct

Abstract

The utility model discloses an air volume sampling pipeline anti-blocking device for a boiler hot air duct, and relates to the technical field of boiler hot air duct cleaning. A positive pressure side air volume sampling device and a negative pressure side air volume sampling device are arranged on the hot air duct; the anti-blocking device comprises a compressed air header pipe and a gas-liquid metal hose, an alkali liquor filling pipe is installed on one side of the compressed air header pipe, the gas-liquid metal hose is fixedly installed at the lower end of the compressed air header pipe, and the gas-liquid metal hose is connected to a positive pressure side air volume sampling device or a negative pressure side air volume sampling device through a pipe fitting connecting piece. According to the utility model, the pipeline of the sampling device can be effectively dredged and cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler hot air duct cleaning technical field, concretely is a kind of air volume sampling pipeline anti-blocking device for boiler hot air duct. BACKGROUND

[0002] In the boiler system, in order to realize accurate air volume measurement, usually install multiple air volume sampling tubes at the rear end of the air preheater. These sampling tubes monitor the air volume by measuring the static and dynamic pressure inside the multi-point grid, providing key parameters for the boiler's air supply adjustment. However, the working principle of the air preheater determines that there is a problem of dust accumulation and pollution in long-term operation. The regenerative sheets of the air preheater alternately pass through flue gas and air. When passing through flue gas, the dust and carbon black in the flue gas are deposited on the surface of the regenerative sheets due to electrostatic adsorption and adhesion. When passing through air, these deposits are partially carried into the air stream and enter the hot air system. Eventually, the dust and carbon black accumulate in the air volume sampling tubes, causing the sampling tubes to be blocked.

[0003] Because the dust mixes with the oily substances in the air to form dirt with strong adhesion and consolidation, it is difficult to completely remove by traditional compressed air blowing or simple water washing. Once the sampling tube is blocked, it will directly affect the accuracy of air volume measurement, and then cause the air supply control of the boiler to be inaccurate, affecting the combustion efficiency and economic operation of the unit. At the same time, the blockage problem may also cause pressure fluctuations in the boiler hot air duct, posing a threat to the safe operation of the boiler.

[0004] In order to maintain the accuracy of air volume measurement, the existing technology often needs to frequently disassemble and clean the air volume sampling tubes. However, this method not only increases the maintenance cost and workload, but also may affect the continuous operation of the boiler system. In some complex working conditions, the cleaning process is time-consuming and inefficient, which may cause the unit to run unstable and even interrupt the production. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide an air volume sampling pipeline anti-blocking device for boiler hot air duct to solve the technical problem of existing boiler system flue gas and air volume measurement equipment often being blocked, which affects the normal operation of the unit.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of air volume sampling pipeline anti-blocking device for boiler hot blast tunnel, and positive pressure side air volume sampling device and negative pressure side air volume sampling device are provided on hot blast tunnel;Anti-blocking device includes compressed air main and gas, liquid metal hose, one side of the compressed air main is equipped with lye filling pipe, the lower end of the compressed air main is fixedly installed with the gas, liquid metal hose, and the gas, liquid metal hose is connected to positive pressure side air volume sampling device or negative pressure side air volume sampling device by pipe fitting connector.

[0007] Preferably, the positive pressure side air volume sampling device includes a positive pressure side air volume sampling pipe and a positive pressure side manifold; one end of the positive pressure side air volume sampling pipe is connected to the hot blast tunnel, and the positive pressure side air volume sampling pipe is provided with at least one positive pressure side air volume sampling pipe, and the other end of the positive pressure side air volume sampling pipe is connected to the positive pressure side manifold.

[0008] Preferably, the positive pressure side air volume sampling device further includes a positive pressure side back flushing valve, and the positive pressure side back flushing valve is arranged on the positive pressure side manifold.

[0009] Preferably, the negative pressure side air volume sampling device includes a negative pressure side air volume sampling pipe and a negative pressure side manifold; one end of the negative pressure side air volume sampling pipe is connected to the hot blast tunnel, and the negative pressure side air volume sampling pipe is provided with at least one negative pressure side air volume sampling pipe, and the other end of the negative pressure side air volume sampling pipe is connected to the negative pressure side manifold.

[0010] Preferably, the negative pressure side air volume sampling device further includes a negative pressure side back flushing valve, and the negative pressure side back flushing valve is arranged on the negative pressure side air volume sampling pipe.

[0011] Preferably, the utility model further includes a compressed air control valve, and the compressed air control valve is arranged on the compressed air main and located at the upper part of the lye filling pipe.

[0012] Preferably, the utility model further includes a lye control valve, and the lye control valve is arranged on the lye filling pipe.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] Through the combination of the compressed air main and the lye filling pipe, when blockage occurs in the positive pressure side air volume sampling device and the negative pressure side air volume sampling device, the dissolved effect of the lye and the blowing effect of the compressed air can quickly clean the oil stains and dust in the pipeline, and avoid the shortcomings of traditional single medium cleaning.

[0015] The gas, liquid metal hose is connected to the positive pressure side or negative pressure side sampling device, which can flexibly switch the back flushing channel and ensure the dredging of each part of the pipeline. The back flushing valves are respectively arranged on the positive pressure side manifold and the negative pressure side manifold, which can quickly control the flow path of the gas and the lye and simplify the cleaning operation.

[0016] The use of the alkali solution filling pipe effectively removes stubborn oil stains in the pipeline, and the high-pressure airflow provided by the compressed air further disperses the residual dust, ensuring that the pipeline is clean and unobstructed, thereby maintaining the long-term stability and accuracy of the air volume measurement.

[0017] The device can clean the blockage in time, reduce the air volume measurement deviation caused by blockage in the boiler hot air duct, avoid the influence on the air supply automatic control system, ensure that the boiler runs in an economic state, improve the energy utilization efficiency, and at the same time, reduce the manual maintenance cost.

[0018] The device supports separate cleaning or simultaneous cleaning of the positive pressure side and the negative pressure side, meeting the needs of different operating conditions.

[0019] In summary, through the application of the anti-blocking device, the problem of easy blockage of the boiler air volume measurement device in long-term operation can be effectively solved, not only the measurement accuracy is improved, but also the maintenance workload is significantly reduced, the operation cost is reduced, and the safety and economy of the boiler system operation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] In the figure: 1, compressed air main pipe; 2, alkali solution filling pipe; 3, gas, liquid metal hose; 4, hot air duct; 5, positive pressure side air volume sampling pipe; 6, negative pressure side air volume sampling pipe; 7, positive pressure side manifold; 8, positive pressure side back flushing valve; 9, negative pressure side manifold; 10, negative pressure side back flushing valve; 11, compressed air control valve; 12, alkali solution control valve; 13, pipe fitting connector. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by the terms "vertical", "upper", "lower", "horizontal" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0024] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term '' set '', '' install '', '' link '', '' connect '' should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through intermediate medium indirectly connected, can be two element inside the intercommunication.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0025] Fuel oil boiler air sampling pipe often occurs blockage, the inventor found that, in its interior not only exists a large amount of soot, also found that there is oily material in it, lead to normal compressed air cannot be swept completely, if simply lye flushing, pressure is not enough, for this, the patent proposed smoke air measurement anti-blocking device effectively combines the two, as follows:

[0026] Please refer to Figure 1 In the embodiment, a kind of air sampling pipe anti-blocking device for boiler hot blast pipe is provided, including compressed air main pipe 1, wherein compressed air main pipe 1 is from compressed air main pipe, one side of compressed air main pipe 1 is fixedly installed with alkali liquid filling pipe 2, and the lower end of compressed air main pipe 1 is fixedly installed with gas, liquid metal hose 3, the top tube wall of hot blast pipe 4 is fixedly inserted with multiple positive pressure side air sampling pipe 5 and negative pressure side air sampling pipe 6, the upper end of multiple positive pressure side air sampling pipe 5 is installed with same positive pressure side manifold 7, the upper end of multiple negative pressure side air sampling pipe 6 is installed with same negative pressure side manifold 9, the lower end of gas, liquid metal hose 3 is fixedly installed in the upper end of positive pressure side manifold 7 or negative pressure side manifold 9, for the decontamination of positive pressure side manifold 7, positive pressure side air sampling pipe 5 or negative pressure side air sampling pipe 6, negative pressure side manifold 9.

[0027] In the embodiment, specifically, a complete set of positive pressure side air volume sampling device and negative pressure side air volume sampling device are fixedly installed above the hot air duct 4, the positive pressure side air volume sampling device is composed of four sampling pipes and a collecting main pipe, the negative pressure side air volume sampling device is composed of four groups of sampling pipes (three in each group) and a collecting main pipe, the compressed air control valve 11 is installed on the compressed air main pipe 1, the lye control valve 12 is installed on the lye filling pipe 2, the lye is arranged in the lye filling pipe 2, and fire-fighting water can also be directly used, the compressed air main pipe 1, the lye filling pipe 2 and the gas-liquid metal hose 3 are arranged above the positive pressure side air volume sampling pipe 5, the positive pressure side collecting pipe 7, the negative pressure side air volume sampling pipe 6 and the negative pressure side collecting pipe 9 of the hot air duct 4, the lye is first filled into the sampling device from the lye filling pipe 2, then the compressed air control valve 11 is opened to blow the sampling pipe, the compressed air drives the lye into the sampling device, so that the sampling device pipe can be effectively dredged and cleaned, and it needs to be noted that in the actual operation, the gas-liquid metal hose 3 can be first installed at the upper end of one of the positive pressure side collecting pipe 7 or the negative pressure side collecting pipe 9, then the compressed air control valve 11 and the lye control valve 12 are opened to well backwash and clean the above-mentioned one, when the cleaning is completed, the gas-liquid metal hose 3 of the above-mentioned one is removed and then installed on the other one to repeat the above-mentioned backwashing operation, so that the equipment can be effectively cleaned, the fuel oil boiler cleaning efficiency is improved, the cleaning capacity is improved, the accuracy of the air volume can be ensured, the long-term measurement accuracy can be ensured, the size of the air volume in each air pipe can be timely reflected, the boiler operation can be adjusted at any time, the boiler can always operate under a relatively economic condition, and the automatic investment rate of the boiler is greatly improved.

[0028] In the embodiment, the cross sections of the positive pressure side collecting pipe 7 and the negative pressure side collecting pipe 9 are both inverted T-shaped structures, the upper ends of the positive pressure side collecting pipe 7 and the negative pressure side collecting pipe 9 are both provided with threaded joints, the lower end of the gas-liquid metal hose 3 is rotatably installed with a pipe fitting connector 13, specifically, the pipe fitting connector 13 can be a threaded pipe fitting connector, and in order to facilitate the installation or disassembly of the gas-liquid metal hose 3 and the positive pressure side collecting pipe 7 and the negative pressure side collecting pipe 9, the threaded joint and the pipe fitting connector 13 can improve the working efficiency during backwashing.

[0029] In the embodiment, the positive pressure side back blowing and sweeping valve 8 and the negative pressure side back blowing and sweeping valve 10 are installed on the positive pressure side collecting pipe 7 and the negative pressure side collecting pipe 9 respectively, and the positive pressure side back blowing and sweeping valve 8 and the negative pressure side back blowing and sweeping valve 10 can be used for conveniently controlling the on-off of the fluid in the positive pressure side collecting pipe 7 and the negative pressure side collecting pipe 9.

[0030] In conclusion, the application of the anti-clogging device can reduce a large amount of maintenance workload, improve the safe, stable and economic operation of the boiler, and make the accurate measurement of the secondary air volume, so that the operation personnel can monitor the matching condition of the air-coal ratio at any time, and provide necessary conditions for the input of the air supply automatic regulation system.

[0031] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for preventing clogging of a flow sampling duct of a hot blast pipe of a blast furnace, characterized in that, The hot air duct (4) is provided with positive pressure side air volume sampling device and negative pressure side air volume sampling device; the anti-blocking device comprises compressed air main pipe (1) and gas-liquid metal hose (3), one side of the compressed air main pipe (1) is provided with lye filling pipe (2), the lower end of the compressed air main pipe (1) is fixedly provided with the gas-liquid metal hose (3), the gas-liquid metal hose (3) is connected to the positive pressure side air volume sampling device or the negative pressure side air volume sampling device through pipe fitting connector (13).

2. The anti-clogging device for the air volume sampling duct of the hot blast main of a blast furnace according to claim 1, characterized in that, The positive pressure side air volume sampling device comprises positive pressure side air volume sampling pipe (5) and positive pressure side manifold (7); one end of the positive pressure side air volume sampling pipe (5) is connected with the hot air duct (4), the positive pressure side air volume sampling pipe (5) is provided with at least one and the other end of the positive pressure side air volume sampling pipe (5) is connected with the positive pressure side manifold (7).

3. The anti-clogging device for the air volume sampling duct of the hot blast main of a blast furnace according to claim 2, characterized in that, The positive pressure side air volume sampling device further comprises positive pressure side back flushing valve (8), which is arranged on the positive pressure side manifold (7).

4. The anti-clogging device for the air volume sampling duct of the hot blast main of a blast furnace according to claim 1, characterized in that, The negative pressure side air volume sampling device comprises negative pressure side air volume sampling pipe (6) and negative pressure side manifold (9); one end of the negative pressure side air volume sampling pipe (6) is connected with the hot air duct (4), the negative pressure side air volume sampling pipe (6) is provided with at least one and the other end of the negative pressure side air volume sampling pipe (6) is connected with the negative pressure side manifold (9).

5. The anti-clogging device for the air volume sampling duct of the hot blast main of a blast furnace according to claim 4, characterized in that, The negative pressure side air volume sampling device further comprises negative pressure side back flushing valve (10), which is arranged on the negative pressure side air volume sampling pipe (6).

6. A device for preventing clogging of a flue gas sampling duct of a boiler hot flue gas duct according to any one of claims 1 - 5, characterized in that It further comprises compressed air control valve (11), which is arranged on the compressed air main pipe (1) and located at the upper part of the lye filling pipe (2).

7. A device for preventing clogging of a flue gas sampling duct of a boiler hot flue gas duct according to any one of claims 1 - 5, characterized in that It further comprises lye control valve (12), which is arranged on the lye filling pipe (2).

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