CN202609590U - Closed cavity type variable pressure dry powder pump device - Google Patents

Abstract

The utility model discloses a closed cavity type variable pressure dry powder pump device, which comprises a feed pipe, a piston rod and a cylinder body. The cylinder body forms a certain angle with the horizontal direction. The lower end of the feed pipe is connected, the upper end of the feed pipe is connected with the discharge port of the atmospheric pressure silo, and a feed valve is set on the feed pipe; the lower end of the cylinder is connected to the feed port of the high-pressure delivery silo through the powder outlet , an outlet valve is set at the powder outlet; a hollow piston rod is set along the axis in the barrel, and a piston back cover and a piston front cover matching the inner hole of the barrel are arranged at the lower end of the piston rod, and the piston back cover and the piston front cover A cavity is formed between them, and a number of air-tight holes are arranged on the front cover of the piston. The inner cavity of the cylinder communicates with the cavity through the air-tight holes, and the cavity communicates with the external high-pressure air source through the piston rod. The utility model can replace the variable pressure chamber in the warehouse pump conveying system, and improves the reliability of the conveying system.

Description

Closed cavity type variable pressure dry powder pump device

technical field

The utility model relates to a closed cavity type variable pressure dry powder pump device, which is suitable for powder material transportation in industrial processes such as large-scale dry powder gasification, IGCC power generation, chemical industry, metallurgy and the like.

Background technique

Large-scale coal gasification technology is the core technology for clean and efficient conversion of coal. At present, the hot spot in the development of coal gasification technology is dry powder entrained bed gasification. The stability and controllability of the dry powder feeding system are crucial to the safe and stable operation of the entire gasification process. role. The conveying system adopts the powder lock hopper system, which is composed of a normal pressure powder silo, a high pressure conveying silo, and a variable pressure silo connecting the two silos with alternating high pressure and low pressure. In this system, since the operation of the variable pressure chamber is a process of alternating pressure, it is easy to produce arching, bridging, false material level and other phenomena during the feeding process of the variable pressure chamber, resulting in the unsmooth feeding process, which needs to be broken frequently. Arch, causing pressure fluctuations in the variable pressure chamber, prolonging the feeding time and increasing the labor load of the operator; and due to the periodic discharge of the variable pressure chamber, the material level of the high-pressure conveying bin changes periodically, which in turn causes the fluidization state to change. Instability, resulting in unstable and uncontrollable powder conveying.

Contents of the invention

Purpose of the invention: The utility model aims at the defects or deficiencies of the pressure change chamber in the prior art, and provides a closed cavity type pressure change dry powder pump device that can replace the pressure change chamber.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A closed cavity type variable pressure dry powder pump device, including a feed pipe, a piston rod and a cylinder, the cylinder forms a certain angle with the horizontal direction, and the upper part of the cylinder is connected to the lower end of the feed pipe through an inlet valve , the upper end of the feed pipe is connected to the discharge port of the atmospheric pressure silo, and a feed valve is set on the feed pipe; the lower end of the cylinder is connected to the feed port of the high-pressure delivery bin through the powder outlet, and at the powder outlet An outlet valve is set at the center of the barrel; a hollow piston rod is set along the axis in the barrel, and a piston back cover and a piston front cover matching the inner hole of the barrel are arranged at the lower end of the piston rod, and a gap is formed between the piston back cover and the piston front cover. Cavity, on the front cover of the piston, a number of gas-permeable and airtight-hole columns are arranged, the inner cavity of the cylinder communicates with the cavity through the air-permeable and air-tight hole columns, and the cavity communicates with the external high-pressure air source through the piston rod.

In the utility model, further, the inner wall of the cylinder is smooth, and the piston back cover and the piston front cover are closely matched with the inner wall of the cylinder; the angle between the cylinder and the horizontal direction is 15-60°.

In the present utility model, further, the gas-permeable dense-porous column is a porous sintered metal material.

Compared with the prior art, the airtight cavity type variable pressure dry powder pump of the utility model has the following advantages:

(1) It can replace the variable pressure chamber in the silo pump conveying system, effectively avoid the unstable operation of the entire powder conveying system caused by problems such as bridging and arching in the silo, and improve the reliability of the conveying system;

(2) The pressure in the barrel is slightly higher than the pressure of the high-pressure delivery bin, and the powder material in the barrel is evenly dispersed without being compressed, and can smoothly enter the high-pressure delivery bin under the push of the piston;

(3) The powder material is partly fluidized and transported in the cylinder, and the fluidity of the material is strong. After entering the high-pressure conveying bin, the powder material is easy to fluidize and is not prone to failures such as arching and bridging;

(4) There is no pressure relief and exhaust process, effectively reducing the consumption of high-pressure air sources;

(5) Realize continuous feeding to the high-pressure delivery bin, keep the material level in the high-pressure delivery bin basically unchanged, make the fluidization state of the powder stable, and the feeding process stable and continuous;

(6) The structure is simple and compact, the volume is small, and the installation and arrangement are convenient.

Description of drawings

Fig. 1 is a schematic diagram of a conveying system with a closed cavity type variable pressure dry powder pump;

Fig. 2 is a schematic structural diagram of a closed cavity type variable pressure dry powder pump device.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further explained.

Figure 1 is a schematic diagram of a conveying system with a closed cavity type variable pressure dry powder pump device. The powder enters the powder body conveying system from the top of the atmospheric pressure silo 11, and enters the closed cavity type variable pressure dry powder pump device under normal pressure. The pressure is changed and sent to the high-pressure delivery bin 13.

As shown in Figure 2, a closed cavity type pressure-changing dry powder pump device of the present invention includes a feed pipe 1, a piston rod 4 and a cylinder 8, the cylinder 8 forms a certain angle with the horizontal direction, and the The size of the angle is selected according to the angle of repose of the conveying powder, generally in the range of 15° to 60°. The upper part of the cylinder body 8 is connected to the lower end of the feed pipe 1 through the inlet valve 3, the upper end of the feed pipe 1 is connected to the discharge port of the atmospheric pressure silo 11, and the feed valve 2 is arranged on the feed pipe 1; The lower end of the cylinder 8 is connected to the feed port of the high-pressure delivery bin 13 through the powder outlet 10, and an outlet valve 9 is arranged at the powder outlet 10; a hollow piston rod 4 is arranged along the axis in the cylinder 8, and the piston rod 4 drives Driven by the cylinder, it moves up and down along the cylinder body 8 axis. At the lower end of the piston rod 4, a piston back cover 5 and a piston front cover 6 matching the inner hole of the cylinder body 8 are provided. The inner wall of the cylinder body 8 is smooth, and the piston back cover 5 1. The piston front cover 6 is closely matched with the inner wall of the cylinder body 8, and the seal is good. A cavity 12 is formed between the piston back cover 5 and the piston front cover 6; several porous sintered metal materials are arranged on the piston front cover 6. The air-permeable air-tight hole column 7, the inner cavity of the cylinder body 8 communicates with the cavity 12 through the air-permeable air-tight hole column 7, and the cavity 12 communicates with the external high-pressure air source through the piston rod 4. air pressure. The feed valve 2, inlet valve 3, outlet valve 9, piston rod 4 drive cylinder and high-pressure air source of the airtight cavity type variable pressure dry powder pump device are all controlled by computer. The inlet valve 3 and the outlet valve 9 are periodically opened and closed by program control.

The working process of the closed cavity type variable pressure dry powder pump device: first close the outlet valve 9, open the feed valve 2 and the inlet valve 3, a certain amount of powder material enters the cylinder 8 under the action of gravity flow, and then close the inlet valve 3 ; The front piston cover 6 moves from the bottom dead center B to the top dead center A, and the outlet valve 9 is opened after the piston front cover 6 crosses the position of the inlet valve 3, and at the same time, the cavity 12 is filled with high pressure by an external high-pressure air source through the piston rod 4 Gas, the pressure of the high-pressure gas is slightly higher than the pressure in the high-pressure delivery bin; the high-pressure gas passes through the gas-permeable airtight hole column 7 to pressurize the powder material in the cylinder 8, and the piston front cover 6 pushes the powder material to the powder outlet 10 moves into the high-pressure delivery chamber 13; when the piston front cover 6 moves to the top dead center A, close the external high-pressure gas source connection, and close the outlet valve 9; the piston front cover 6 moves to the bottom dead center B, and the piston front cover 6 and the outlet valve 9 The volume of the cavity between them increases and the gas pressure decreases. When the piston front cover 6 moves to the inlet valve 3, the gas pressure drops to normal pressure; after the piston front cover 6 returns to the bottom dead center B, the inlet valve 3 is opened again. The gas pressure inside the cylinder 8 is low, and the powder material can fall into the cylinder 8 smoothly. By repeating the above cycle process, continuous feeding to the high-pressure delivery bin can be realized. the

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (4)

1. closed cavity type transformation dry powder pump device; It is characterized in that: comprise feed pipe (1), piston rod (4) and cylindrical shell (8); Said cylindrical shell (8) is certain included angle with horizontal direction; The top of cylindrical shell (8) is connected with the lower end of feed pipe (1) through inlet valve (3), and the upper end of said feed pipe (1) is connected with the discharging opening of normal pressure feed bin (11), and charging valve (2) is set on feed pipe (1); The lower end of cylindrical shell (8) locates to be provided with outlet valve (9) through the inlet point in powder outlet (10) connection high-pressure delivery storehouse (13) in powder outlet (10); The piston rod (4) of hollow is set along axis in cylindrical shell (8); Be provided with and suitable piston bonnet (5) and the piston protecgulum (6) of cylindrical shell (8) endoporus in piston rod (4) lower end, form a cavity (12) between said piston bonnet (5) and the piston protecgulum (6); Some ventilative close Kong Zhu (7) are set on piston protecgulum (6), and cylindrical shell (8) inner chamber is communicated with cavity (12) through ventilative close Kong Zhu (7), and cavity (12) is communicated with the external high pressure source of the gas through piston rod (4).

2. a kind of closed cavity type transformation dry powder pump device according to claim 1, it is characterized in that: the inwall of said cylindrical shell (8) is a smooth inner wall, piston bonnet (5), piston protecgulum (6) closely cooperate with the inwall of cylindrical shell (8).

3. a kind of closed cavity type transformation dry powder pump device according to claim 1 and 2 is characterized in that: cylindrical shell (8) is 15～60 ° with the angle of horizontal direction

4. a kind of closed cavity type transformation dry powder pump device according to claim 1 is characterized in that: said ventilative close Kong Zhu (7) processes for porous sintered metal materials.

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