PDS dosing device
By designing a PDS dosing device including a mixing tank, a mixer and an hourglass feeding device, the problems of insufficient mixing of catalysts and unstable feeding process in the prior art are solved, and a more efficient gas desulfurization process is achieved.
Patent Information
- Application Number
- CN202421732480.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-22
AI Technical Summary
During the addition process of the existing PDS desulfurization agent dosing device, the catalyst mixing is not sufficient and the addition process is unstable, resulting in the operation of the gas desulfurization process being inefficient enough.
A PDS dosing device is designed, including a mixing tank with an inlet and an outlet. The inlet conveys the supply liquid through a regulating valve and the outlet conveys the mixed liquid through a metering pump. The mixing tank is equipped with an agitator and an hourglass feeding device. The level gauge is installed in the upper half of the hourglass. The linkage between the level gauge and the regulating valve is realized through the DCS system to ensure that the flow of the supply water matches the amount of PDS added.
Through this device, the PDS dosing process is more stable, the catalyst activation effect is better, and the efficiency of HPF desulfurization is finally improved.
Smart Images
Figure CN222846680U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to a catalyst dosing device for dosing desulfurization rich liquid in the reaction process of coal gas HPF desulfurization, which is applied to the coking industry and specifically is a PDS dosing device. Background Art
[0002] In the coking industry, the HPF method is widely used to desulfurize hydrogen sulfide in coal gas. In order to improve the removal efficiency of hydrogen sulfide, in addition to studying high-efficiency catalysts, the method of adding catalysts is also particularly critical. The article "Design of the Modification Scheme of the Catalyst Feeding System in the Coke Oven Gas Desulfurization Process" with the number 1001-3709 (2020) 05-0033-02 also improved the PDS dosing method, but it is limited to the use of a single coking plant and cannot be widely used in all coking plants. Therefore, it is imperative to study the PDS dosing device.
[0003] Specifically, during the addition process of the existing PDS dosing device, the catalyst is not mixed sufficiently, the addition process is not stable enough, and the coal gas desulfurization process does not operate efficiently enough. Utility Model Content
[0004] The utility model provides a PDS dosing device to solve the technical problems that when the PDS desulfurizer is added, the catalyst is not mixed sufficiently and the adding process is unstable (ie, the concentration is unstable).
[0005] The utility model is implemented by adopting the following technical scheme: a PDS dosing device, comprising a mixing tank provided with an inlet and an outlet, the inlet conveys a feed liquid to the mixing tank through a pipeline provided with a regulating valve, and the outlet conveys a mixed liquid to a desulfurization system reaction tank through a pipeline provided with a metering pump; a stirrer and an hourglass-type dosing device are installed on the top of the mixing tank; the stirring wheel of the stirrer is located in the mixing tank; a level meter is installed in the upper middle part of the hourglass-type dosing device.
[0006] Furthermore, the signal output end of the material level meter is connected to a DCS system, and the regulating valve is a pneumatic regulating valve or an electric gate valve; the control end of the pneumatic regulating valve or the electric gate valve is also connected to the DCS system. The DCS system is provided with control logic for the regulating valve.
[0007] Furthermore, the hourglass-type feeding device is composed of three sections, which are a large-diameter section, a tapered-diameter section and a small-diameter section from top to bottom, wherein the material level meter is installed in the large-diameter section.
[0008] Furthermore, the stirring rod of the mixer is provided with three layers of stirring wheels from top to bottom, and each layer of stirring wheels is provided with a plurality of stirring teeth.
[0009] Furthermore, the inlet and outlet of the mixing pool are located at opposite sides of the mixing pool, and the inlet is located in the upper middle part of the mixing pool, and the outlet is close to the bottom of the mixing pool.
[0010] The working process of the utility model is as follows: the PDS feeding port adopts an hourglass-type feeding device, which uses the self-flow characteristics of the hourglass to allow the PDS to enter the mixing tank, and a level meter is set in the upper half of the hourglass to achieve continuous and stable feeding of PDS. The supplementary water uses the secondary condensate returned from the acid production to enter the mixing tank, and a stirrer is set in the mixing tank for continuous stirring. The supplementary water is supplemented by a pneumatic regulating valve or an electric gate valve, which is linked to the state of the level meter and adjusted in combination with the indication of the level meter to adjust the opening of the pneumatic regulating valve or the electric gate valve. After being mixed in the mixing tank, the PDS (mixed liquid) activation liquid enters the desulfurization system reaction tank through a metering pump.
[0011] The PDS dosing device adopted by the utility model, when combined with a corresponding dosing method, makes the dosing process more stable, the PDS activation effect is better, and ultimately improves the desulfurization efficiency of the HPF method. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 Schematic diagram of the structure of the utility model.
[0013] Figure 2 Schematic diagram of the various stages of material falling in the feeding device.
[0014] 1- regulating valve, 2- mixer, 3- hourglass type feeding device, 4- material level meter, 5- metering pump, 6- desulfurization system reaction tank, 7- mixing tank. DETAILED DESCRIPTION
[0015] Embodiment 1 A PDS dosing device comprises a mixing tank 7 provided with an inlet and an outlet, wherein the inlet delivers a replenishing liquid to the mixing tank 7 through a pipeline provided with a regulating valve, and the outlet delivers a mixed liquid to a desulfurization system reaction tank 6 through a pipeline provided with a metering pump 5; a stirrer 2 and an hourglass-type dosing device 3 are installed on the top of the mixing tank 7; a stirring wheel of the stirrer 2 is located in the mixing tank 7; and a material level meter 4 is installed in the middle and upper part of the hourglass-type dosing device 3. The inlet and outlet of the mixing tank 7 are respectively located on opposite sides of the mixing tank 7, and the inlet is located in the middle and upper part of the mixing tank 7, and the outlet is close to the bottom of the mixing tank 7.
[0016] Embodiment 2 The signal output end of the material level meter 4 is connected to the DCS system, and the control end of the regulating valve 1 is also connected to the DCS system; the regulating valve 1 adopts a pneumatic regulating valve or an electric gate valve. The DCS system can realize the linkage between the material level meter and the pneumatic regulating valve 1 or the electric gate valve, and control the opening of the regulating valve by the set control program combined with the indication of the material level meter to ensure that the flow rate of the feed water matches the amount of PDS desulfurizer added.
[0017] Embodiment 3 The hourglass-type feeding device 3 is composed of three sections, which are a large-diameter section, a tapered-diameter section and a small-diameter section from top to bottom, wherein the material level meter 4 is installed in the large-diameter section.
[0018] Embodiment 4 The stirring rod of the stirrer 2 is provided with three layers of stirring wheels from top to bottom, and each layer of stirring wheels is provided with a plurality of stirring teeth.
[0019] like Figure 1 As shown, the height of the liquid level in the mixing tank is Z1, the height of the top of the conical section of the hourglass-type feeding device 3 is H, and the height of the top of the material inside the hourglass-type feeding device 3 is Z u , the radius of the large diameter section is R, the radius of the small diameter section is r, and the inclination angle of the conical section is α. The liquid level of the level meter is divided into three stages to adjust the opening of the regulating valve. According to actual measurements, the level meter and the regulating valve adopt the following control logic: Figure 2 As shown, in 0< t < t In period 1, the top of the material is located in the large-diameter section, and the material falls at a speed of v u is a value, at this time you can set a flow value of make-up water; t 1< t < t 2 Time period, the top of the material is in the cone diameter section, the material falls at a speed v u The flow rate of the corresponding make-up water is also given. t 2< t < t In the 3rd period, the material has left the conical diameter section and entered the small diameter end. At this time, the flow value changes again, and the flow of the make-up water is also adjusted accordingly. In fact, even in the three stages, the flow value of the material changes, but the change range is relatively small, so it is divided into three sections for control, which is sufficient to meet production requirements. Of course, in order to more accurately control the amount of make-up water added, the flow value of the make-up water can also be controlled to change with time in the three time periods, so as to more accurately match the falling flow of the material.
[0020] The innovation of this utility model is embodied in:
[0021] 1. The supplementary water medium is secondary condensate instead of production water or desulfurization liquid. Secondary condensate is desulfurization liquid after double-effect treatment of desulfurization waste liquid. Its index is close to steam condensate, but it must be returned to the gas desulfurization system for use. If the supplementary water is production water, it is easy to cause the gas desulfurization system to be rich in liquid. If the supplementary water is desulfurization liquid, it may react with PDS during the mixing process and cannot play the catalytic role of PDS in the desulfurization process.
[0022] 2. The PDS feeding port adopts an hourglass-type feeding device, and a material level meter is set in the upper half of the hourglass. Through the self-flow characteristics of the hourglass, the solid granular PDS enters the mixing tank smoothly, without the need to add a vibration device, reducing energy consumption.
[0023] 3. Make-up water is added by pneumatic regulating valve or electric gate valve. The uniformity of the mixed liquid is adjusted by the discharge amount of the level meter and the opening of the pneumatic regulating valve or electric gate valve for make-up water to ensure the uniform and stable mixing concentration of the mixed liquid.
[0024] 4. By studying the momentum distribution and changes of the PDS system, the law of weight change during the feeding process is discovered and analyzed. The momentum of the system is proportional to the length of the PDS flow area, and the proportional coefficient is the mass flow rate (referring to the certain proportional relationship between the height of the feeding and the time), so as to set the relationship between the PDS flow rate and the material level. Through multiple observations and measurements, the proportional relationship between the material level height and the discharge amount (or flow rate) in the hourglass feeding device can be found, and then the discharge amount can be known in real time through the counting of the level meter, so as to control the amount of secondary condensate added, and maximize the uniformity and stability of the mixed concentration of the mixed liquid in the mixing tank.
[0025] 5. A stirring device is added to the mixing tank. PDS and the secondary condensate flow into the mixing tank by gravity and are evenly mixed. The stirring rod of the mixer is set as a three-layer stirring wheel, and the three-layer stirring wheel is respectively provided with multiple layers of stirring gears to increase the mixing capacity.
Claims
1. A PDS dosing device, characterized in that: The invention comprises a mixing tank (7) provided with an inlet and an outlet, wherein the inlet delivers a supply liquid to the mixing tank (7) through a pipeline provided with a regulating valve (1), and the outlet delivers a mixed liquid to a desulfurization system reaction tank (6) through a pipeline provided with a metering pump (5). A stirrer (2) and an hourglass-type feeding device (3) are installed on the top of the mixing tank (7); a stirring wheel of the stirrer (2) is located in the mixing tank (7); and a material level meter (4) is installed in the middle and upper part of the hourglass-type feeding device (3).
2. A PDS dosing device as claimed in claim 1, characterized in that: The signal output end of the material level meter (4) is connected to a DCS system, and the control end of the regulating valve (1) is also connected to the DCS system; the regulating valve (1) is a pneumatic regulating valve or an electric gate valve.
3. A PDS dosing device as claimed in claim 1 or 2, characterized in that: The hourglass-type feeding device (3) consists of three sections, which are, from top to bottom, a large-diameter section, a tapered-diameter section, and a small-diameter section, wherein the material level meter (4) is installed in the large-diameter section.
4. A PDS dosing device as claimed in claim 1 or 2, characterized in that: The stirring rod of the stirrer (2) is provided with three layers of stirring wheels from top to bottom, and each layer of stirring wheels is provided with a plurality of stirring teeth.
5. A PDS dosing device as claimed in claim 3, characterized in that: The stirring rod of the stirrer (2) is provided with three layers of stirring wheels from top to bottom, and each layer of stirring wheels is provided with a plurality of stirring teeth.
6. A PDS dosing device as claimed in claim 1 or 2, characterized in that: The inlet and outlet of the mixing tank (7) are respectively located on opposite sides of the mixing tank (7), and the inlet is located in the upper middle part of the mixing tank (7), while the outlet is close to the bottom of the mixing tank (7).