Adjacent valve linkage air supply device used in pneumatic ash conveying system

Abstract

The utility model relates to an adjacent valve linkage air supply device used in a pneumatic ash conveying system, which comprises at least two air supply valves, two chambers are arranged in each air supply valve, and piston components which push each other are arranged in the two chambers; one side of the same chamber of each gulp valve is connected with a gas conveying pipeline, and the other side of the same chamber of each gulp valve is connected with an ash conveying pipeline; different cavities of every two adjacent gulp valves are connected through a pressure transmission pipe. According to the utility model, the pressure of the ash conveying pipeline is gradually reduced at a constant speed along the flow direction, the blockage of the ash conveying pipeline is eliminated, and the consumption of compressed air can be reduced.

Description

An adjacent valve linkage air supply device used in a pneumatic ash conveying system Technical Field

[0001] This utility model relates to the field of powder conveying technology, and in particular to an adjacent valve linkage air replenishment device used in a pneumatic ash conveying system. Background Technology

[0002] During the conveying of fly ash and other powders in thermal power plants, the air replenishment device of the pneumatic ash conveying system cannot control the air intake during air replenishment. After installation, the air intake is a fixed amount, which cannot match the reasonable operating conditions of the ash conveying system. When the air intake is small, it is easy to cause system blockage. When the air intake is large, the high flow velocity of the mixed gas in the pipeline will cause pipeline wear and serious system failure. Summary of the Invention

[0003] The purpose of this invention is to provide an adjacent valve linkage air replenishment device used in a pneumatic ash conveying system to solve the problems encountered in the background art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An adjacent valve linkage air supply device used in a pneumatic ash conveying system includes at least two air supply valves, each of which has two chambers and two piston assemblies that push each other. One side of the same chamber of each air supply valve is connected to an air conveying pipeline, and the other side is connected to an ash conveying pipeline. The different chambers of two adjacent air supply valves are connected by a pressure transmission pipe.

[0006] In practice, each of the air supply valves has a partition in the middle to isolate the interior of the valve body into two chambers, namely the first valve chamber and the second valve chamber, and the piston assembly is installed in the first valve chamber and the second valve chamber.

[0007] The piston assembly includes a first piston, a second piston, and a rigid shaft. The rigid shaft passes through the partition and is connected at one end to the first piston and at the other end to the second piston. The first piston is located in the first valve chamber, and the second piston is located in the second valve chamber.

[0008] In the above scheme, the upper part of the second valve chamber is provided with a compressed air interface for connecting to the air conveying pipeline, and the lower part of the second valve chamber is provided with an ash conveying pipeline interface for connecting to the ash conveying pipeline.

[0009] In the above scheme, limiting components are provided at the connection between the rigid shaft and the first piston, and at the connection between the rigid shaft and the second piston. As a preferred embodiment, the limiting component is either a limiting spring or a rubber sleeve.

[0010] In one embodiment, the lower part of the second valve chamber is provided with a pressure transmission pipe outlet, the upper part of the first valve chamber is provided with a pressure transmission pipe inlet, and the pressure transmission pipe outlet of the next air replenishment valve is connected to the pressure transmission pipe inlet of the previous air replenishment valve through a pipeline.

[0011] In one embodiment, air intake channels are respectively provided on the inner walls of the first valve chamber and the second valve chamber.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: In the pneumatic ash conveying system, this device installs an air replenishment valve 1 at regular intervals along the ash conveying pipeline. When the pressure of the next air replenishment valve on the flow side is higher than the pressure of the current air replenishment valve, the pressure of the next air replenishment valve is transmitted to the current air replenishment valve through the pressure transmission pipe between adjacent air replenishment valves 1. The current air replenishment valve then activates, increasing the air intake and diluting the ash-containing gas concentration in the ash conveying pipeline between adjacent air replenishment valves. The pressure of the next air replenishment valve then decreases and returns to normal working condition. This utility model can make the pressure of the ash conveying pipeline decrease at a uniform rate along the flow direction, eliminate ash conveying pipeline blockage, and reduce the amount of compressed air used. Attached Figure Description

[0013] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0014] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 is a schematic diagram of the air replenishment valve in this utility model;

[0016] Figure 3 is a structural schematic diagram of the present invention in practice.

[0017] The following numbers are used in the diagram: 1-Air replenishment valve; 11-First valve chamber; 12-Second valve chamber; 13-Baffle plate; 14-Pressure transmission pipe inlet; 15-Pressure transmission pipe outlet; 16-Compressed air interface; 17-Ash conveying pipe interface; 18-Air inlet channel; 2-Piston assembly; 21-First piston; 22-Second piston; 23-Rigid shaft; 24-Limiting component. Detailed Implementation

[0018] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the utility model will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model, and therefore only show the relevant components of this utility model.

[0019] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] As shown in Figures 1 and 2, an adjacent valve linkage air replenishment device used in a pneumatic ash conveying system includes at least two air replenishment valves 1. Each air replenishment valve 1 has two chambers, and piston assemblies 2 that push against each other are installed in the two chambers. When the air in one chamber is compressed, the piston assembly 2 moves towards the other chamber, distributing the force between the two chambers. One side of the same chamber of each air replenishment valve 1 is connected to the air conveying pipeline, and the other side is connected to the ash conveying pipeline, which is used to replenish air during the ash conveying process, thereby facilitating stable control of the air intake in the later stage. The different chambers of two adjacent air replenishment valves 1 are connected by a pressure transmission pipe to transmit air pressure, thereby stabilizing the air intake. As a preferred embodiment, a one-way valve can be installed in the pressure transmission pipe to achieve one-way air passage.

[0022] This device is installed at certain intervals on the ash conveying pipeline from the pneumatic ash conveying system's silo pump to the ash silo. A compressed air supply pipeline is arranged parallel to the ash conveying pipeline as the air source for this device. The initial section connecting the supply pipeline and the compressed air pipeline is equipped with a pneumatic valve, which opens synchronously when the ash conveying system starts and closes synchronously when the ash conveying system shuts down.

[0023] In practice, specifically, each air supply valve 1 has a partition 13 in the middle, which isolates the interior of the valve body into two chambers, namely the first valve chamber 11 and the second valve chamber 12, and the piston assembly 2 is installed in the first valve chamber 11 and the second valve chamber 12.

[0024] The piston assembly 2 includes a first piston 21, a second piston 22, and a rigid shaft 23. The rigid shaft 23 passes through the partition 13, with one end connected to the first piston 21 and the other end connected to the second piston 22. The air supply valve 1 adopts a dual-chamber structure, with an opening between the two chambers to facilitate the movement of the rigid shaft 23. The first piston 21 is located in the first valve chamber 11, and the second piston 22 is located in the second valve chamber 12. Because the rigid shaft 23 has pistons on its upper and lower sides, when the first piston 21 is displaced due to pressure changes, it drives the rigid shaft 23 to move, causing the second piston 22 to move as well. The movement of the second piston 22 changes the cross-sectional area of ​​the intake passage, thereby changing the intake volume.

[0025] Among them, when the first piston 21 and the second piston 22 contact the inner wall of the air supply valve 1, the inner wall of the air supply valve 1 should be smooth and have sufficient sealing performance. In addition, the rigid shaft 23 needs to be equipped with multiple O-rings at the opening connection of the partition plate 13 to ensure sealing performance and prevent air leakage between the first valve chamber 11 and the second valve chamber 12.

[0026] In implementation, a compressed air interface 16 is provided at the upper part of the second valve chamber 12, which can be installed on the upper side wall. The compressed air interface 16 is used to connect to the air conveying pipeline. A conveying ash pipeline interface 17 is provided at the lower part of the second valve chamber 12, which can be installed at the bottom position. The conveying ash pipeline interface 17 is used to connect to the conveying ash pipeline.

[0027] Limiting elements 24 are provided at the connection points of the rigid shaft 23 and the first piston 21, and at the connection points of the rigid shaft 23 and the second piston 22, respectively. The limiting elements 24 restrict the stroke of the piston assembly 2 to prevent over-limit operation in the event of a system malfunction. As a preferred embodiment, the limiting element 24 can be either a limiting spring or a rubber sleeve. The limiting spring or rubber sleeve is fixedly fitted onto the upper and lower connecting ends of the rigid shaft 23 to limit the stroke of the piston assembly 2.

[0028] Please refer to Figure 3. In the pneumatic ash conveying system, this device is installed with an air supply valve 1 at regular intervals along the ash conveying pipeline. When the pressure of the next air supply valve on the flow side is higher than the pressure of the current air supply valve, the pressure of the next air supply valve is transmitted to the current air supply valve through the pressure transmission pipe between adjacent air supply valves 1. The current air supply valve is activated, increasing the air intake and diluting the ash-containing gas concentration in the ash conveying pipeline between adjacent air supply valves. The pressure of the next air supply valve decreases and returns to normal working condition.

[0029] In one embodiment, a pressure transmission pipe outlet 15 is provided at the lower part of the second valve chamber 12 for connecting the pressure transmission pipe. The pressure transmission pipe outlet 15 is located on the lower side wall of the second valve chamber 12. A one-way valve can be installed at the pressure transmission pipe outlet 15 to achieve one-way air passage. A pressure transmission pipe inlet 14 is provided at the upper part of the first valve chamber 11, located at the top of the first valve chamber 11. The pressure transmission pipe outlet 15 of the next air supply valve 1 is connected to the pressure transmission pipe inlet 14 of the previous air supply valve 1 through a pipeline, achieving the effect of linked air supply between adjacent valves.

[0030] In the pneumatic ash conveying system, the pressure transmission pipe outlet 15 at the front end and the pressure transmission pipe inlet 14 at the rear end are sealed and blocked, while the compressed air interface 16 at the front end continues to be connected to the air supply pipe.

[0031] In one embodiment, air inlet channels 18 are respectively provided on the inner walls of the first valve chamber 11 and the second valve chamber 12. The air inlet channels 18 are used to connect the upper and lower parts of the first valve chamber 11 or the second valve chamber 12. The air inlet channels 18 have ventilation grooves so that the air volume in the valve chamber changes with the movement of the piston. When the second piston 22 moves, it is located between the pressure transmission pipe outlet 15 and the compressed air interface 16. To prevent the second piston 22 from exceeding its limit, a limiting member 24 is provided.

[0032] In summary, this application provides an automatic compressed air replenishment device for the pneumatic conveying of powder. A compressed air replenishment pipeline is arranged on the side of the ash conveying pipeline. A replenishment valve 1 is installed at regular intervals between the ash conveying pipeline and the replenishment pipeline. A pressure transmission pipe is arranged between two adjacent replenishment valves 1. The pressure transmission pipe transmits the pressure change of the replenishment valve 1 in the outflow direction to the current valve. The current replenishment valve automatically adjusts the compressed air intake volume according to the received pressure change.

[0033] This invention enables the pressure in the ash conveying pipeline to decrease at a uniform rate along the flow direction, eliminates pipeline blockage, and reduces compressed air consumption. This device differs from other ash conveying systems' air supply valve devices in that it has the following characteristics: 1. Adjacent valves operate according to the differential pressure in the ash conveying pipeline; the air supply volume is determined by the differential pressure—a higher differential pressure results in a larger air supply, and vice versa. 2. This feature eliminates pipe blockage caused by excessively high local pressure in the ash conveying pipeline. 3. This feature makes the pressure drop curve along the conveying direction of the ash conveying pipeline more linear, reducing the total system resistance and system air consumption.

[0034] When the pneumatic ash conveying system is running, between adjacent valves: if the differential pressure between the current air supply valve and the ash conveying pipeline is greater than the differential pressure between the subsequent air supply valve and the ash conveying pipeline, the current air supply valve will not supply air; if the differential pressure between the current air supply valve and the ash conveying pipeline is less than the differential pressure between the subsequent air supply valve and the ash conveying pipeline, the current air supply valve will supply air. The amount of air supplied is proportional to the magnitude of the differential pressure.

[0035] In pneumatic ash conveying systems using multiple units of this device, the pressure along the flow direction of the system decreases linearly and steadily due to the linkage between adjacent replenishment valves caused by differential pressure changes. Because the pressure decreases steadily, the flow velocity increases uniformly without abrupt local pressure changes, and the density of the mixed gas decreases uniformly, resulting in more stable system operation. Therefore, this device reduces the resistance of the ash conveying system, lowers air consumption (energy consumption), and eliminates pipe blockage.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. These undisclosed elements are all prior art known to those skilled in the art.

[0037] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An adjacent valve linkage air supply device used in a pneumatic ash conveying system, characterized in that: It includes at least two air supply valves (1), each of which has two chambers and two piston assemblies (2) that push each other in the two chambers; one side of the same chamber of each air supply valve (1) is connected to an air supply pipeline and the other side is connected to an ash supply pipeline; the different chambers of two adjacent air supply valves (1) are connected by a pressure transmission pipe.

2. The adjacent valve linkage air supply device used in a pneumatic ash conveying system according to claim 1, characterized in that: Each of the air supply valves (1) has a partition (13) in the middle, which isolates the interior of the valve body into two chambers, namely the first valve chamber (11) and the second valve chamber (12), and the piston assembly (2) is installed in the first valve chamber (11) and the second valve chamber (12).

3. A device for air supply to the adjacent valves in a pneumatic ash conveying system according to claim 2, characterized in that The piston assembly (2) includes a first piston (21), a second piston (22) and a rigid shaft (23). The rigid shaft (23) passes through the partition (13) and is connected to the first piston (21) at one end and to the second piston (22) at the other end. The first piston (21) is located in the first valve chamber (11) and the second piston (22) is located in the second valve chamber (12).

4. A device for air supply to the adjacent valves in linkage according to claim 3, characterized in that: The upper part of the second valve chamber (12) is provided with a compressed air interface (16), which is used to connect with the air conveying pipeline. The lower part of the second valve chamber (12) is provided with an ash conveying pipeline interface (17), which is used to connect with the ash conveying pipeline.

5. A device for air supply to the adjacent valves in a pneumatic ash conveying system according to claim 3, characterized in that Limiting members (24) are provided at the connection between the rigid shaft (23) and the first piston (21) and at the connection between the rigid shaft (23) and the second piston (22).

6. A device for air supply to the adjacent valves in linkage according to claim 5, characterized in that: The limiting component (24) can be either a limiting spring or a rubber sleeve.

7. A device for air supply in linkage with adjacent valves used in a pneumatic ash conveying system according to claim 2, characterized in that: The lower part of the second valve chamber (12) is provided with a pressure transmission pipe outlet (15), and the upper part of the first valve chamber (11) is provided with a pressure transmission pipe inlet (14). The pressure transmission pipe outlet (15) of the next air replenishment valve (1) is connected to the pressure transmission pipe inlet (14) of the previous air replenishment valve (1) through a pipeline.

8. The adjacent valve linkage air supply device used in a pneumatic ash conveying system according to claim 2, characterized in that: Air intake channels (18) are respectively provided on the inner walls of the first valve chamber (11) and the second valve chamber (12).

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