Double-half-ball valve

Abstract

The utility model discloses a double-half-ball valve which comprises a first half-ball valve, a second half-ball valve and a middle valve body, one end of the middle valve body is connected with an outlet end of a valve body of the first half-ball valve, and the other end of the middle valve body is connected with an inlet end of a valve body of the second half-ball valve. A protective gas inlet is formed in the side wall, adjacent to the first half ball valve, of the middle valve body, and a protective gas outlet is formed in the side wall, adjacent to the second half ball valve, of the middle valve body. The semi-ball valve has the advantages that the middle valve body is additionally arranged between the first semi-ball valve and the second semi-ball valve, and the shielding gas inlet and the shielding gas outlet are formed in the middle valve body, so that in the valve closing stage, the first semi-ball valve can be closed firstly, then high-temperature steam is fed through the shielding gas inlet to purge coke powder and the like gathered behind the first semi-ball valve, and therefore the service life of the semi-ball valve is prolonged. And therefore, coke powder in the middle valve body and the valve body of the second semi-ball valve is reduced, and the sealing performance of the second semi-ball valve is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and in particular to a double-hemisphere valve. Background Technology

[0002] Coal pyrolysis refers to the process by which coal is heated in the absence of air, undergoing complex physical and chemical changes, and ultimately decomposing into products such as coal gas, coal tar, and coke / semi-coke / clean coal.

[0003] Coal pyrolysis uses pulverized coal as raw material. The general products are pyrolysis gas, coal tar, and clean coal. Because the raw material is pulverized coal, the pyrolysis gas contains a high amount of coke dust. Even after treatment by a two-stage cyclone dust collector, the coke dust content in the pyrolysis gas is still as high as 50 g / m³. 3 As the pyrolysis gas flow rate decreases and it collides with pipelines and equipment, the coke powder contained in the pyrolysis gas gradually settles down and adheres to the lower part of parallel-installed pipelines. Moreover, when the valve is closed, the temperature inside the pipeline downstream of the valve decreases, and a small amount of coal tar condenses and precipitates out, sticking to the valve sealing surface together with the coke powder, affecting the valve's sealing performance. When it is necessary to close the valve and cut off the gas medium, gas leakage often causes safety accidents, seriously affecting the smooth operation of production and causing very large economic losses. Utility Model Content

[0004] The purpose of this invention is to provide a double-hemispherical valve to solve the problems existing in the prior art.

[0005] This utility model is implemented by the following technical solution: a double hemisphere valve, comprising a first hemisphere valve and a second hemisphere valve, and further comprising an intermediate valve body, one end of the intermediate valve body being connected to the outlet end of the valve body of the first hemisphere valve, and the other end of the intermediate valve body being connected to the inlet end of the valve body of the second hemisphere valve; a protective gas inlet is provided on the side wall of the intermediate valve body adjacent to the first hemisphere valve, and an inlet control valve is installed on the protective gas inlet; a protective gas outlet is provided on the side wall of the intermediate valve body adjacent to the second hemisphere valve, and an outlet control valve is installed on the protective gas outlet.

[0006] Furthermore, both the protective gas inlet and the protective gas outlet are located at the bottom of the intermediate valve body.

[0007] Furthermore, the valve stems of both the first and second hemispherical valves are arranged horizontally.

[0008] The advantages of this utility model are as follows: By setting a first hemispherical valve and a second hemispherical valve, a double shut-off of the pipeline is achieved; and by adding an intermediate valve body between the first and second hemispherical valves, which has an inlet and outlet for protective gas, during the valve closing stage, the first hemispherical valve can be closed first, and then high-temperature steam is introduced through the protective gas inlet to purge the coke powder and other materials accumulated after the first hemispherical valve, and at the same time to replace the tar after the first hemispherical valve, thereby reducing the condensation and precipitation of coke powder and tar in the intermediate valve body and the valve body of the second hemispherical valve, ensuring the sealing performance of the second hemispherical valve, which can effectively improve the sealing effect of the double hemispherical valve described in this utility model, with reliable sealing performance, and eliminate the safety hazards caused by pyrolysis gas leakage. Attached Figure Description

[0009] Figure 1 This is an overall structural diagram of this embodiment.

[0010] Figure 2 This is a usage state diagram for this embodiment.

[0011] In the picture:

[0012] 1. First hemispherical valve; 2. Second hemispherical valve; 3. Intermediate valve body; 4. Protective gas inlet; 5. Protective gas outlet; 6. Inlet control valve; 7. Outlet control valve. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] like Figure 1 and Figure 2 As shown, a double-hemispherical valve includes a first hemispherical valve 1 and a second hemispherical valve 2, and also includes an intermediate valve body 3. One end of the intermediate valve body 3 is connected to the outlet end of the valve body of the first hemispherical valve 1, and the other end of the intermediate valve body 3 is connected to the inlet end of the valve body of the second hemispherical valve 2. A protective gas inlet 4 is provided on the side wall of the intermediate valve body 3 adjacent to the first hemispherical valve 1, and an inlet control valve 6 is installed on the protective gas inlet 4. A protective gas outlet 5 is provided on the side wall of the intermediate valve body 3 adjacent to the second hemispherical valve 2, and an outlet control valve 7 is installed on the protective gas outlet 5. Both the protective gas inlet 4 and the protective gas outlet 5 are located at the bottom of the intermediate valve body 3. The valve stems of the first hemispherical valve 1 and the second hemispherical valve 2 are both arranged horizontally, and each of the first hemispherical valve 1 and the second hemispherical valve 2 has an independent drive mechanism.

[0015] Instructions for use:

[0016] In use, the double hemisphere valve described in this embodiment is installed in a flat manner on a parallel conveying pipeline for pyrolysis gas (400-600℃), with the valve bodies of the first hemisphere valve 1 and the second hemisphere valve 2 installed in parallel, and the protective gas inlet 4 and the protective gas outlet 5 both located at the bottom of the intermediate valve body 3; wherein the inlet end of the valve body of the first hemisphere valve 1 is the gas inlet end, and the outlet end of the valve body of the second hemisphere valve 2 is the gas outlet end; the protective gas inlet 4 is connected to a high-temperature steam pipeline with a temperature of 400-500℃ and a pressure of 0.6MPa, and the protective gas outlet 5 is connected to an venting pipeline;

[0017] Valve opening: Keeping the inlet control valve 6 and outlet control valve 7 closed, the valve stems of the first hemispherical valve 1 and the second hemispherical valve 2 are driven to rotate the hemispheres of the first hemispherical valve 1 and the second hemispherical valve 2 to the top of the valve body to the open state. The pyrolysis gas is then transported through the first hemispherical valve 1, the intermediate valve body 3 and the second hemispherical valve 2 in sequence. Figure 1 (In the direction indicated by the middle arrow), some coke powder accumulates at the bottom of the valve during the process;

[0018] Valve Closure: First, close the first hemispherical valve 1; then open the inlet control valve 6 to purge the coke powder inside the valve with high-temperature steam at 400-500℃ and 0.6MPa, replacing the pyrolysis gas in the valve cavity. The raised coke powder and the replaced gas will be discharged through the second hemispherical valve 2. After 5-10 minutes, close the inlet control valve 6 and the second hemispherical valve 2 in sequence; finally, open the inlet control valve 6 and the outlet control valve 7 to continuously purge the intermediate valve body 3 with high-temperature steam through the protective gas inlet 4, and discharge it through the protective gas outlet 5. The discharged steam can be combined with the vent pipe for external discharge.

[0019] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A double-ball valve, comprising a first ball valve and a second ball valve, characterized in that, It also includes an intermediate valve body, one end of which is connected to the outlet end of the valve body of the first hemispherical valve, and the other end of which is connected to the inlet end of the valve body of the second hemispherical valve; a protective gas inlet is provided on the side wall of the intermediate valve body adjacent to the first hemispherical valve, and an inlet control valve is installed on the protective gas inlet; a protective gas outlet is provided on the side wall of the intermediate valve body adjacent to the second hemispherical valve, and an outlet control valve is installed on the protective gas outlet.

2. A double-hemispherical valve according to claim 1, characterized in that, Both the protective gas inlet and the protective gas outlet are located at the bottom of the intermediate valve body.

3. A double-hemispherical valve according to claim 1, characterized in that, The stems of both the first and second hemispherical valves are arranged horizontally.

Images