Override valve and its adsorption and desorption system

Abstract

The present invention provides a transcending valve and an adsorption and desorption system thereof. The transcending valve comprises a valve housing, a left inlet, a bottom outlet, a right outlet, a piston switch connection port, a piston rod, and two lower valve plates vertically connected to the piston rod and arranged in parallel; the spacing between the two valve plates is L2, the height of the surrounding wall 1 of the valve housing is H1, the height of the surrounding wall 2 is H2, the height of the surrounding wall 3 is H3, and the height of the surrounding wall 4 is H4, and L2>H4-H2>H1-H3. When the transcending valve is used in the adsorption and desorption system, the right outlet is connected to the exhaust gas inlet of the adsorption and desorption tank 1, and the bottom outlet is connected to the exhaust gas inlet of the adsorption and desorption tank 2. When the present invention is used for adsorption and desorption, each tank body has a long working time and a short residence time, can maintain a continuous operation state, and has a utilization rate of more than 90%.

Description

Technical Field

[0001] The invention relates to a valve and waste gas adsorption and desorption equipment. Background Art

[0002] Valves are control components in fluid delivery systems. Valves include gate valves, stop valves, butterfly valves, ball valves, plug valves, check valves, pressure reducing valves, steam traps, etc.

[0003] Valves are classified by driving mode: 1. Manual: driven by handwheel, handle, lever or sprocket, etc., and equipped with speed reduction devices such as worm gear and gear when transmitting large torque. 2. Electric, hydraulic, pneumatic: driven by motor or other electrical devices; driven by (water, oil); driven by compressed air; driven by cylinder piston and other motion forms.

[0004] Chemical or environmental protection companies often use adsorption tanks to absorb waste gas generated during production operations to reduce resource waste and environmental pollution caused by emissions. After a period of adsorption, the adsorption tank is prone to saturation. It is necessary to introduce steam or other inert gases into the adsorption tank for desorption in order to restore the adsorption function of the adsorption tank and achieve recycling.

[0005] When a common device consisting of two adsorption tanks connected in parallel is working, one adsorption tank is usually working while the other is on standby; or one adsorbs while the other desorbs; which is equivalent to only one adsorption tank working while the other is always waiting. In addition, since each adsorption tank needs to last for a long time (such as 10-20 hours) when adsorbing, and it takes a shorter time (such as 1-2 hours) when desorbing gas is introduced for desorption, the utilization efficiency of the entire device is only about 20%, with high energy consumption, low efficiency, and very uneconomical. Summary of the invention

[0006] Purpose of the invention:

[0007] Provided is a valve with one inlet and two outlets, which can control the on-off status of the two outlets respectively, and a transcending adsorption and desorption system with long adsorption time, short desorption time and high equipment utilization efficiency.

[0008] Technical solution:

[0009] In the present invention, the left side, right side, upper part, bottom part, top end, bottom end, etc. are only used for explaining the present invention and do not limit the positional relationship when used specifically.

[0010] The overrunning valve of the present invention comprises a valve housing, a left inlet, a bottom outlet, a right outlet, and a piston switch (or piston rod driving mechanism) connection port (a piston rod and two parallel lower valve plates 1 and upper valve plates 2 vertically connected to the piston rod are installed; the maximum stroke of the upper valve plate 2 is L1, and the distance between the two valve plates is L2. The switch working process is that the piston rod drives the valve plates 1 and 2 to move up and down, and the side wall of the valve housing also serves as the cylinder body of the piston rod.

[0011] The side wall of the valve housing has four surrounding walls (the surrounding wall 1 between the side inlet and the piston switch connection port, with a height of H1; the surrounding wall 2 between the side inlet and the bottom outlet, with a height of H2; the surrounding wall 3 between the side outlet and the piston switch connection port, with a height of H3; the surrounding wall 4 between the side outlet and the bottom outlet, with a height of H4.

[0012] The thickness of the two valve plates is the same, which is d, and the diameter of the left inlet and the right outlet is basically the same (diameter is D).

[0013] In the present invention, it is set that:

[0014] The top end of the surrounding wall 4 is higher than the bottom end of the surrounding wall 1 , and the size of the raised portion is greater than the thickness d of the valve plate and less than 3d.

[0015] H2 and H3 are greater than (10~30)d, so the size of the raised part is much smaller than H2 and H3.

[0016] Therefore, the various parameters have the following mathematical relationship:

[0017] L2>H4-H2>H1-H3;

[0018] H1+H2+D>L1+L2>H3+H4.

[0019] Further assume that H2=H3; then d <H4-H1<(2~4)d。

[0020] The different strokes of the piston rod determine the different contact positions between the valve plates 1 and 2 and the side walls, thereby determining whether the two outlets of the transcending valve are connected to the inlet, whether the fluid (gas, liquid) can flow, and how it can flow.

[0021] According to mathematical calculations:

[0022] When the position of valve plate 1 or valve plate 2 is higher than the bottom of surrounding wall 1 and lower than the top of surrounding wall 4, the left inlet and the right outlet cannot be connected; therefore, the probability A that they can be connected is 1-2 (H4-H1) / (L1+L2).

[0023] When the position of the valve plate 2 is lower than the top of the surrounding wall 2, the left inlet and the bottom outlet cannot be connected, and the probability B that they can be connected is 1-H2 / (L1+L2).

[0024] The probability that the left entrance is connected to the right exit and the bottom exit, the probability that the left entrance is connected to the right exit but the left entrance and the bottom exit are not connected, and the probability that the left entrance is connected to the bottom exit but the left entrance and the right exit are not connected are not calculated; under these conditions, it can be guaranteed that the left entrance is connected to at least one exit.

[0025] The probability C that the left entrance is not connected to both exits is (H4-H1) / (L1+L2).

[0026] According to the above settings and mathematical relationships, it can be seen that the value of A is greater than B, much greater than C, that is, A>B>>C, indicating that the probability that the left inlet is not connected to both outlets is very small. When both are not connected, no fluid enters. At this time, the adsorption process cannot occur in the two adsorption tanks below, and they can be used for the desorption process. When the controller controls the piston rod to move up and down normally and continuously, the chance of the overrunning valve being used to control the adsorption tank in the desorption state is far less than the chance of adsorption (single tank adsorption or dual tanks adsorption at the same time).

[0027] Another object of the present invention is:

[0028] Provided is an adsorption and desorption system with each adsorption and desorption tube having a long working time and high operating efficiency.

[0029] The above-mentioned transcending valve is used in a device consisting of two adsorption tanks (or adsorption analysis tanks) connected in parallel, the left inlet is connected to the exhaust gas source, the right outlet is connected to the exhaust gas inlet of adsorption tank A; the bottom outlet is connected to the exhaust gas inlet of adsorption tank B.

[0030] Each adsorption tank has an exhaust gas inlet, a desorption gas inlet (equipped with a desorption gas valve), or a purified gas outlet and a desorption liquid outlet; each adsorption and analysis tank is connected to an exhaust gas concentration detector.

[0031] There is also a controller. Two exhaust gas concentration detectors are connected through signal lines and transmit concentration signals to the controller; the controller is connected through control lines and controls the override valve and two desorption valves.

[0032] The device of the present invention: When the overrunning valve of the present invention is used in a system of two adsorption tanks connected in parallel (each adsorption tank has an exhaust gas inlet, a desorption liquid outlet, a desorption gas inlet, and a purified gas outlet), the exhaust gas source is connected to the inlet of the overrunning valve, the exhaust gas inlet of adsorption tank A is connected to the right outlet of the overrunning valve, and the exhaust gas inlet of adsorption tank B is connected to the bottom outlet of the overrunning valve.

[0033] The pipelines of the two desorption gas inlets are respectively provided with desorption gas valves.

[0034] The control system is respectively connected to control the piston switch of the overrunning valve and the switches of the two resolver valves.

[0035] The operation and control mode of the above device:

[0036] In the present invention, when any one outlet of the transcending valve is opened, adsorption can be performed; when both outlets of the transcending valve are closed, adsorption stops and desorption begins.

[0037] The control system determines the adsorption or desorption operation time of the two tanks, and controls the piston switch of a transcending valve and the switch of two desorption valves. In addition, the piston rod drives the two valve plates to move in a short stroke, and the switch changes flexibly and quickly, so as to adapt to the data of large probability (A+B) of the adsorption process when the two-way outlet of the transcending valve is opened or the one-way outlet is opened, and the probability C of desorption when the two-way outlet is closed is small, so that the adsorption time is greatly extended and the desorption time is greatly reduced. There is no need for the controller to control the piston rod to drive the valve plate to move rapidly, which reduces the wear of the valve plate; avoids instantaneous short circuit during adsorption, or the valve plate cannot be closed tightly during desorption and still absorbs fluid, so that the adsorption and desorption processes can be strictly divided, and the adsorption efficiency and desorption are improved.

[0038] The device of the present invention, through the use of the overrunning valve, allows the two parallel adsorption tanks to have the dual structural characteristics of parallel and series connection at the same time. When one adsorption tank is adsorbing, the other adsorption tank is desorbing. During desorption, the intake air of the tank automatically enters the other tank to be adsorbed; and once the desorption is completed, the tank starts a new adsorption process. The adsorption and desorption of each adsorption tank can be realized in an interlaced manner and can also be operated cross-synchronously. The adsorption process and desorption process of the two adsorption tanks do not need to stay and wait for a long time to carry out the next cycle.

[0039] Beneficial effects:

[0040] The present invention can organically connect two or more adsorption tanks into a whole, each tank has a long working time (especially a long adsorption time and a long desorption stop time), a short residence time (short desorption time and a short adsorption stop time), a short interval time, each tank maintains a continuous operation state, the overall operation efficiency is high, and the utilization rate is greater than 90%; in a system composed of traditional double adsorption tanks, when in use, the adsorption and desorption time are basically half each, or one is working and the other is on standby, and the utilization rate is only about 50%.

[0041] Moreover, it is self-controlled, highly reliable and has low error rate, and low labor intensity for workers. The adsorption and desorption processes can be controlled separately, and there are multiple operation modes, which are suitable for the treatment of various types and concentrations of waste gas.

[0042] In addition to being used in adsorption and desorption systems, the override valve of the present invention can also be used in other chemical, environmental protection, and water supply and drainage projects, and for fluid control of various fluids such as gas and liquid, all of which can bring the characteristics of high operating efficiency, easy control, and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a three-dimensional structural schematic diagram of the transcending valve of the present invention;

[0044] Figure 2 It is a schematic cross-sectional structure diagram of the overrunning valve of the present invention;

[0045] Figure 3 It is a schematic diagram of the connection structure of a device of the present invention.

[0046] In the figure, 1. Override valve; 2-controller; 3-adsorption tank A; 4-adsorption tank B; 10-left inlet; 11-bottom outlet; 12-right outlet; 15-enclosure 1; 16-enclosure 2; 17-enclosure 3; 18-enclosure 4; 20-piston switch; 21-piston rod; 22-piston rod (between the two valve plates of 8-lower valve plate 1 and 9-upper valve plate 2); 30-exhaust gas concentration detector; 31-purified gas outlet; 32-desorption gas valve; 33-desorption liquid outlet. DETAILED DESCRIPTION

[0047] like Figure 1 , 2 The illustrated overrunning valve has a valve housing, a left inlet, a bottom outlet, a right outlet, and a piston switch connection port for mounting a piston rod and two parallel lower valve plates 1 and an upper valve plate 2 vertically connected to the piston rod; the maximum stroke of the upper valve plate 2 is L1, the spacing between the two valve plates is L2, and the thickness of the two valve plates is the same as d; the height of the surrounding wall 1 is H1; the height of the surrounding wall 2 is H2; the height of the surrounding wall 3 is H3; the height of the surrounding wall 4 is H4;

[0048] The top end of the surrounding wall 4 is higher than the bottom end of the surrounding wall 1, and the size of the higher part is about 2d.

[0049] L2>H4-H2>H1-H3; H2=H3 is about 20d; d <H4-H1<3d。

[0050] The adsorption and desorption system using the above-mentioned transcending valve is used in a device consisting of two adsorption tanks connected in parallel, such as Figure 3 As shown, each adsorption tank has an exhaust gas inlet; the left inlet of the transcending valve is connected to the exhaust gas source, the right outlet is connected to the exhaust gas inlet of adsorption tank A, and the bottom outlet is connected to the exhaust gas inlet of adsorption tank B.

[0051] Each adsorption tank has a desorption gas inlet, or a desorption liquid outlet, a purified gas outlet; each adsorption analysis tank is connected to an exhaust gas concentration detector, and each desorption gas inlet is equipped with a desorption gas valve;

[0052] There is also a controller. Two exhaust gas concentration detectors are connected through signal lines and transmit concentration signals to the controller; the controller is connected through control lines and controls the override valve and two desorption valves.

Claims

1. A transcending valve, comprising a valve housing, a left inlet (10), a bottom outlet (11), and a right outlet (12), characterized in that: There is also a piston switch connection port for installing a piston rod (21) and two parallel lower valve plates 1 (8) and upper valve plates 2 (9) vertically connected to the piston rod (21); the maximum stroke of the upper valve plate 2 (9) is L1, the distance between the two valve plates is L2, and the thickness of the two valve plates is the same as d; The piston rod drives the lower valve plate 1 (8) and the upper valve plate 2 (9) to move up and down, and the side wall of the valve housing also serves as the cylinder body of the piston rod (21); The side wall of the valve housing has four surrounding walls: a surrounding wall 1 (15) is provided between the left inlet (10) of the valve housing and the piston switch connection port, and its height is H1; a surrounding wall 2 (16) is provided between the left inlet (10) and the bottom outlet (11), and its height is H2; a surrounding wall 3 (17) is provided between the right outlet (12) and the piston switch connection port, and its height is H3; a surrounding wall 4 (18) is provided between the right outlet (12) and the bottom outlet (11), and its height is H4; The top end of the surrounding wall 4 (18) is higher than the bottom end of the surrounding wall 1 (15), and the size of the raised portion is greater than the thickness d of the valve plate and less than 3d; L2>H4-H2>H1-H3.

2. The overrunning valve according to claim 1, characterized in that: H2 and H3 are greater than (10~30) days.

3. The overrunning valve according to claim 1, characterized in that: The diameters of the left inlet (10) and the right outlet (12) are both D, H1+H2+D>L1+L2>H3+H4.

4. The overrunning valve according to claim 1, characterized in that: H2=H3; d <H4-H1<(2~4)d。 5. An adsorption and desorption system, characterized in that: The overrun valve (1) of claim 1 is used in a device consisting of two adsorption tanks connected in parallel, each of which has an exhaust gas inlet; the left inlet (10) of the overrun valve (1) is connected to an exhaust gas source, the right outlet (12) is connected to the exhaust gas inlet of adsorption tank A (3), and the bottom outlet is connected to the exhaust gas inlet of adsorption tank B (4).

6. The adsorption-desorption system according to claim 5, characterized in that: Each adsorption tank has a desorption gas inlet, or a desorption liquid outlet (33), and a purified gas outlet (31); each adsorption tank is connected to an exhaust gas concentration detector (30), and each desorption gas inlet is equipped with a desorption gas valve (32); A controller is also provided. Two exhaust gas concentration detectors (30) are respectively connected via signal lines and transmit concentration signals to the controller. The controller is respectively connected via control lines and controls the overrunning valve (1) and the two desorption valves (32).

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