Device and method for hydraulically driving dosing and material circulation

Abstract

The invention provides a device and a method for hydraulically driving chemical feeding and material circulation. The device comprises a high-pressure material tank, a chemical feeding storage tank, a chemical feeding hydraulic pump, a circulating hydraulic pump and a buffer tank, the dosing hydraulic pump and the circulating hydraulic pump are both connected with the high-pressure material tank, the dosing storage tank is connected with the dosing hydraulic pump, and the circulating hydraulic pump is connected with the buffer tank. A high-pressure side liquid phase process material is used as a power source to respectively drive the sulfuric acid dosing hydraulic pump and the circulating hydraulic pump, and meanwhile, the concentrated sulfuric acid injection process flow and the mixed acid material circulating reflux are realized. No electric equipment is needed for dosing and material circulating reflux, and only pressure energy recycled in the technological process is used as a driving source, so that on one hand, equipment investment is reduced, namely, noise pollution of a pressure reduction pump at a high-pressure liquid phase process material outlet is reduced; secondly, the energy consumption of an original pressure reducing pump, an original chemical adding hydraulic pump and an original circulating hydraulic pump is saved; and thirdly, the processes of dosing and material circulating reflux are simplified.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical production, and particularly relates to a device for hydraulic-driven chemical dosing and material circulation. In addition, the present invention also provides a method for hydraulic-driven chemical dosing and material circulation. Background Art

[0002] In chemical plants, the situation of concentrated sulfuric acid dosing is often involved to adjust the pH value of the process flow. At this time, it is necessary to add a centrifugal pump or a reciprocating pump as a means of sulfuric acid dosing. Moreover, when the pressure in the process flow is high, it will lead to a high injection pressure of concentrated sulfuric acid, and the corresponding power of the dosing pump will increase. However, in fact, the amount of concentrated sulfuric acid required in the process flow is relatively small, and it is difficult to select the appropriate dosing pump.

[0003] In view of this, developing a device for hydraulic-driven chemical dosing and material circulation to solve the problem of difficult selection of dosing pumps has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, and provides a device for hydraulic-driven chemical dosing and material circulation, which uses the high-pressure side liquid-phase process material as the power source to drive the chemical dosing hydraulic pump and the circulation hydraulic pump respectively, and realizes chemical dosing and circulation reflux simultaneously without other power sources.

[0005] The present invention is realized by the following technical solutions:

[0006] One of the invention purposes of the present invention is to provide a device for hydraulic-driven chemical dosing and material circulation, the device includes a high-pressure material tank, a chemical dosing storage tank, a chemical dosing hydraulic pump, a circulation hydraulic pump, and a buffer tank; the chemical dosing hydraulic pump and the circulation hydraulic pump are both connected to the high-pressure material tank, the chemical dosing storage tank is connected to the chemical dosing hydraulic pump, and the circulation hydraulic pump is connected to the buffer tank; the chemical dosing hydraulic pump is provided with a first pressure-reducing process material outlet pipeline and a chemical dosing medium outlet pipeline, and the circulation hydraulic pump is provided with a second pressure-reducing process material outlet pipeline and a circulation return liquid outlet pipeline; the first pressure-reducing process material outlet pipeline, the chemical dosing medium outlet pipeline, the second pressure-reducing process material outlet pipeline, and the circulation return liquid outlet pipeline are all connected to one end of a combined main pipeline, and the other end of the combined main pipeline is connected to the buffer tank.

[0007] In a preferred embodiment of the present invention,

[0008] A liquid level gauge is provided on the high-pressure material tank;

[0009] The high-pressure material tank is provided with an outlet pipeline, and the outlet pipelines of the high-pressure material tank are respectively connected to the chemical dosing hydraulic pump and the circulating hydraulic pump; a liquid level regulating valve is arranged on the outlet pipeline of the high-pressure material tank.

[0010] The liquid level gauge is communicatively connected to the liquid level regulating valve.

[0011] In a preferred embodiment of the present invention,

[0012] The device for hydraulic-driven chemical dosing and material circulation further includes an acid mixer, one end of the acid mixer is connected to the combined main pipeline, and the other end of the acid mixer is connected to the buffer tank.

[0013] In a preferred embodiment of the present invention,

[0014] An inner extension pipe is arranged in the buffer tank, the acid mixer is connected to the buffer tank through the inlet pipeline of the buffer tank, and the inlet pipeline of the buffer tank is connected to the inner extension pipe.

[0015] In a preferred embodiment of the present invention,

[0016] A first pressure gauge and a first pressure regulating valve are arranged on the circulating return liquid outlet pipeline, and the first pressure regulating valve is communicatively connected to the first pressure gauge.

[0017] In a preferred embodiment of the present invention,

[0018] A second pressure gauge is arranged on the buffer tank;

[0019] An upstream of the combined main pipeline is provided with a step-down process material main pipeline, the step-down process material main pipeline is connected to the combined main pipeline, and the step-down process material main pipeline is respectively connected to the first step-down process material outlet pipeline and the second step-down process material outlet pipeline; a second pressure regulating valve is arranged on the step-down process material main pipeline.

[0020] The second pressure gauge and the second pressure regulating valve are communicatively connected.

[0021] In a preferred embodiment of the present invention,

[0022] A feed regulating valve is arranged on the chemical dosing medium outlet pipeline;

[0023] A pH analyzer is arranged on the inlet pipeline of the buffer tank;

[0024] The feed regulating valve and the pH analyzer are communicatively connected.

[0025] In a preferred embodiment of the present invention,

[0026] A check valve is provided on the outlet pipeline of the chemical addition medium, downstream of the feed regulating valve.

[0027] In a preferred embodiment of the present invention,

[0028] The chemical addition hydraulic pump is provided with a first high-pressure material inlet pipeline, and the first high-pressure material inlet pipeline is connected to the outlet pipeline of the high-pressure material tank;

[0029] A flow regulating member is provided on the first high-pressure material inlet pipeline.

[0030] The second object of the present invention is to provide a method for hydraulic-driven chemical addition and material circulation, which is characterized in that it includes the following steps

[0031] S1: The high-pressure liquid in the high-pressure material tank enters the chemical addition hydraulic pump. The high-pressure liquid drives the chemical addition hydraulic pump to extract the chemical addition medium in the chemical addition storage tank and transport it to the chemical addition medium outlet pipeline. The high-pressure liquid entering the chemical addition hydraulic pump is converted into the first pressure-reducing process material and transferred to the first pressure-reducing process material outlet pipeline;

[0032] The high-pressure liquid in the high-pressure material tank enters the circulation hydraulic pump. The high-pressure liquid drives the circulation hydraulic pump to extract the circulating return liquid in the buffer tank and transport it to the circulating return liquid outlet pipeline. The high-pressure liquid entering the circulation hydraulic pump is converted into the second pressure-reducing process material and transferred to the second pressure-reducing process material outlet pipeline;

[0033] S2: The chemical addition medium in the chemical addition medium outlet pipeline, the circulating return liquid in the circulating return liquid outlet pipeline, the first pressure-reducing process material in the first pressure-reducing process material outlet pipeline, and the second pressure-reducing process material in the second pressure-reducing process material outlet pipeline all enter the combined main pipeline and then are transferred to the buffer tank.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1. The present invention uses the high-pressure side liquid-phase process material as the power source to drive the sulfuric acid chemical addition hydraulic pump and the circulation hydraulic pump respectively, and simultaneously realizes the injection of concentrated sulfuric acid into the process flow and the circulation and reflux of the mixed acid material. Neither the chemical addition nor the material circulation and reflux require any electrical equipment. Only the recovered pressure energy in the process flow is used as the driving source. On the one hand, it reduces the equipment investment, that is, the pressure-reducing pump at the outlet of the high-pressure liquid-phase process material, and reduces the noise pollution of the pressure-reducing pump; on the other hand, it saves the energy consumption of the original pressure-reducing pump, the original chemical addition hydraulic pump, and the original circulation hydraulic pump; on the third hand, it simplifies the process of chemical addition and material circulation and reflux.

[0036] 2. The present invention uses the high-pressure side liquid-phase process material as a power source to drive the circulating hydraulic pump, realizing the circulating reflux of the mixed acid material, reducing the pressure load of the downstream process flow and the material selection grade of its pipelines and pipe fittings, and achieving the effects of reducing equipment requirements and investment.

[0037] 3. When the feed flow rate of the high-pressure side liquid-phase process material is low, the sulfuric acid dosing hydraulic pump driven by it stops working, and concentrated sulfuric acid no longer enters the process flow immediately, preventing the problem in the prior art that concentrated sulfuric acid still enters the process flow, thereby causing the pH value to drop rapidly and ultimately corroding the pipelines and devices in the process flow, and further improving the safety of the process flow. Description of the Drawings

[0038] Figure 1 is a structural diagram of the device for hydraulic-driven dosing and material circulation of the present invention;

[0039] In the figure, 1 - high-pressure material tank; 2 - sulfuric acid storage tank; 3 - sulfuric acid dosing hydraulic pump; 4 - acid mixer; 5 - buffer tank; 6 - circulating hydraulic pump; 7 - sulfuric acid feed regulating valve; 8 - pH analyzer; 9 - check valve; 10 - second pressure regulating valve; 11 - first pressure gauge; 12 - second pressure gauge; 13 - first pressure regulating valve; 14 - flow regulating member. Detailed Embodiments

[0040] The present invention will be further described in detail below with reference to the drawings:

[0041] As Figure 1 shown, the present invention provides a device for hydraulic-driven dosing and material circulation, including a high-pressure material tank 1, a dosing hydraulic pump, a circulating hydraulic pump 6, a dosing storage tank, and a buffer tank 5. The high-pressure material tank 1 is respectively communicated with the dosing hydraulic pump and the circulating hydraulic pump 6; the dosing hydraulic pump is communicated with the dosing storage tank; the circulating hydraulic pump 6 is communicated with the buffer tank 5. The dosing hydraulic pump is provided with a first pressure-reducing process material outlet pipeline and a dosing medium outlet pipeline, and the circulating hydraulic pump 6 is provided with a second pressure-reducing process material outlet pipeline and a circulating return liquid outlet pipeline; the first pressure-reducing process material outlet pipeline, the dosing medium outlet pipeline, the second pressure-reducing process material outlet pipeline, and the circulating return liquid outlet pipeline are all communicated with one end of a combined main pipeline, and the other end of the combined main pipeline is communicated with the buffer tank 5.

[0042] Specifically in this embodiment, concentrated sulfuric acid dosing is involved. Therefore, the dosing hydraulic pump is specifically the sulfuric acid dosing hydraulic pump 3, and the dosing storage tank is specifically the sulfuric acid storage tank 2. The high-pressure material tank 1 stores process materials (hereinafter referred to as high-pressure liquid for easy distinction). The pressure range of this high-pressure liquid is 3.6 - 5.0 MPaG. The bottom surface of the high-pressure material tank 1 is provided with an outlet pipeline. The outlet pipeline of the high-pressure material tank 1 is connected to the first high-pressure material inlet pipeline of the sulfuric acid dosing hydraulic pump 3, and the outlet pipeline of the high-pressure material tank 1 is also connected to the second high-pressure material inlet pipeline of the circulating hydraulic pump 6.

[0043] It should be noted that restricting the pressure range of the high-pressure liquid in the high-pressure material tank 1 to 3.6 - 5.0 MPaG is to enable the pressure load of the high-pressure process materials to drive the sulfuric acid dosing hydraulic pump 3 and the circulating hydraulic pump 6. Otherwise, neither sulfuric acid dosing nor material circulation and reflux can be achieved. However, the pressure range of the high-pressure liquid in the high-pressure material tank 1 does not constitute a limitation on the pressure of the process materials in the high-pressure material tank 1. This is because, for different process flows, the pressure requirements of the downstream process flows are different, and the pressure requirements of the downstream process flows directly affect the pressure range of the high-pressure liquid in the high-pressure material tank 1. Therefore, technicians can select according to the actual process requirements.

[0044] In a preferred embodiment of the present invention, a liquid level gauge is provided on the high-pressure material tank 1 to monitor the liquid level in the high-pressure material tank 1. At the same time, a liquid level regulating valve is provided on the outlet pipeline of the high-pressure material tank 1. The liquid level gauge is communicatively connected to the liquid level regulating valve for regulating the liquid level of the high-pressure liquid in the high-pressure material tank 1. Specifically, when the real-time liquid level measured by the liquid level gauge is higher than the preset liquid level, the liquid level regulating valve is triggered to open, so that the high-pressure liquid in the high-pressure material tank 1 enters the sulfuric acid dosing hydraulic pump 3 and the circulating hydraulic pump 6 respectively along the outlet pipeline of the high-pressure material tank 1. When the real-time liquid level measured by the liquid level gauge is lower than the preset liquid level, the liquid level regulating valve is triggered to close, so that the high-pressure liquid in the high-pressure material tank 1 stops flowing out.

[0045] In addition to the first high-pressure material inlet pipeline, the sulfuric acid dosing hydraulic pump 3 is also provided with a sulfuric acid inlet pipeline, a first pressure-reducing process material outlet pipeline, and a sulfuric acid outlet pipeline. The first high-pressure material inlet pipeline is communicated with the first pressure-reducing process material outlet pipeline, and the sulfuric acid inlet pipeline is communicated with the sulfuric acid outlet pipeline. Figure 1 Among them, the two pipelines above the sulfuric acid dosing hydraulic pump 3 are, from left to right, the first high-pressure material inlet pipeline and the first pressure-reducing process material outlet pipeline. The pipeline on the left side of the sulfuric acid dosing hydraulic pump 3 is the sulfuric acid inlet pipeline, and the pipeline on the right side of the sulfuric acid dosing hydraulic pump 3 is the sulfuric acid outlet pipeline.

[0046] The chemical dosing hydraulic pump is connected to the chemical dosing storage tank. Specifically, in this embodiment, the sulfuric acid storage tank 2 is connected to the sulfuric acid inlet pipeline. The high-pressure liquid in the high-pressure material tank 1 enters the sulfuric acid chemical dosing hydraulic pump 3 through the outlet pipeline of the high-pressure material tank 1 and the first high-pressure material inlet pipeline, and then turns to the first pressure-reducing process material outlet pipeline of the sulfuric acid chemical dosing hydraulic pump 3. The first high-pressure material drives the sulfuric acid chemical dosing hydraulic pump 3 to extract sulfuric acid from the sulfuric acid storage tank 2, so that the sulfuric acid enters the sulfuric acid outlet pipeline through the sulfuric acid inlet pipeline. It should be noted that after the first high-pressure material drives the sulfuric acid chemical dosing hydraulic pump 3 to suck sulfuric acid, its own pressure drops, so it is called the first pressure-reducing process material.

[0047] In addition to the second high-pressure liquid inlet pipeline, the circulating hydraulic pump 6 is also provided with a circulating return liquid inlet pipeline, a second pressure-reducing process material outlet pipeline and a circulating return liquid outlet pipeline. The second high-pressure liquid inlet pipeline is communicated with the second pressure-reducing process material outlet pipeline, and the circulating return liquid inlet pipeline is communicated with the circulating return liquid outlet pipeline. Figure 1 Among them, the two pipelines above the circulating hydraulic pump 6 are, from left to right in sequence, the second pressure-reducing process material outlet pipeline and the second high-pressure liquid inlet pipeline; the pipeline on the left side of the circulating hydraulic pump 6 is the circulating return liquid outlet pipeline, and the pipeline on the right side of the circulating hydraulic pump 6 is the circulating return liquid inlet pipeline.

[0048] The circulating hydraulic pump 6 is communicated with the buffer tank 5. Specifically, in this embodiment, the circulating return liquid inlet pipeline of the circulating hydraulic pump 6 is connected to the first outlet pipeline of the buffer tank 5. The high-pressure liquid in the high-pressure material tank 1 enters the circulating hydraulic pump 6 through the outlet pipeline of the high-pressure material tank 1 and the second high-pressure liquid inlet pipeline of the circulating hydraulic pump 6. The second high-pressure material drives the circulating hydraulic pump 6 to extract the circulating return liquid in the buffer tank 5, so that the circulating return liquid enters the circulating return liquid outlet pipeline through the first outlet pipeline of the buffer tank 5 and the circulating return liquid inlet pipeline. It should be noted that after the second high-pressure material drives the circulating hydraulic pump 6 to suck the circulating return liquid, its own pressure drops, so it is called the second pressure-reducing process material.

[0049] The first pressure-reducing process material outlet pipeline, the chemical dosing medium outlet pipeline, the second pressure-reducing process material outlet pipeline and the circulating return liquid outlet pipeline are all communicated with one end of the combined main pipeline. Specifically, in this embodiment, the first pressure-reducing process material outlet pipeline, the sulfuric acid outlet pipeline, the second pressure-reducing process material outlet pipeline and the circulating return liquid outlet pipeline are all communicated with one end of the combined main pipeline.

[0050] More specifically, the first pressure-reducing process material outlet pipeline intersects with the second pressure-reducing process material outlet pipeline (Figure 1 At point a in the figure, the pressure-reducing process materials in the two pipelines jointly enter the main pipeline for the pressure-reducing process materials. The other end of the main pipeline for the pressure-reducing process materials intersects with the pipeline for the outlet of the circulating reflux liquid ( Figure 1 at point b in the figure). The pressure-reducing process materials in the main pipeline for the pressure-reducing process materials and the circulating reflux liquid in the pipeline for the outlet of the circulating reflux liquid jointly enter the merging pipeline. The other end of the merging pipeline intersects with the pipeline for the sulfuric acid outlet ( Figure 1 at point c in the figure). Moreover, the other end of the merging pipeline is connected to the main merging pipeline. The sulfuric acid in the pipeline for the sulfuric acid outlet, the pressure-reducing process materials, and the circulating reflux liquid in the merging pipeline merge and jointly enter the main merging pipeline. The other end of the main merging pipeline is communicated with the buffer tank 5.

[0051] In a preferred embodiment of the present invention, the device for hydraulic-driven chemical addition and material circulation further includes an acid mixer 4. One end of the acid mixer 4 is connected to the main merging pipeline, and the other end of the acid mixer 4 is connected to the buffer tank 5. Specifically, the acid mixer 4 is provided with an inlet, and the inlet of the acid mixer 4 is connected to the main merging pipeline. The merged liquid in the main merging pipeline enters the acid mixer 4 from the inlet of the acid mixer 4 and is fully mixed in the acid mixer 4, so that the pH of the merged liquid is within the preset pH range of the process materials, realizing the adjustment of the pH value in the process flow.

[0052] The buffer tank 5 is provided with an inlet pipeline. The merged liquid fully mixed in the acid mixer 4 is transferred to the buffer tank 5 from the inlet pipeline of the buffer tank 5. On the one hand, the buffer tank 5 can keep the flow rate of the discharged material more stable; on the other hand, it can extend the mixing time of the merged liquid, making the merged liquid (belonging to the acid-containing material) from the acid mixer 4 further mixed evenly, significantly improving the anti-sulfuric acid impact load of the downstream process system. Specifically, when the sulfuric acid content of the merged liquid is relatively high, during the material circulation process, the high-pressure liquid continuously enters the second pipeline for the outlet of the pressure-reducing process materials, the main pipeline for the pressure-reducing process materials, the merging pipeline, the main merging pipeline, the acid mixer 4, the inlet pipeline of the buffer tank 5, and the buffer tank 5. Therefore, there will be a certain liquid level height in the buffer tank 5, and this certain liquid level height is the retained liquid-phase material. The retained liquid-phase material can dilute the merged liquid with a relatively high sulfuric acid content, that is, the retained liquid-phase material can carry the excessive sulfuric acid in the upstream feed, and finally significantly improve the anti-sulfuric acid impact load of the downstream process system. The mixed acid process materials further mixed evenly in the buffer tank 5 are transferred to the next process from the second outlet pipeline of the buffer tank 5.

[0053] It should be noted that the height of the first outlet pipeline of the buffer tank 5 in the vertical direction is greater than the height of the second outlet pipeline of the buffer tank 5 in the vertical direction. When the high-pressure liquid enters the circulating hydraulic pump 6, it will drive the circulating hydraulic pump 6 to suck the circulating return liquid in the buffer tank 5, and make it enter the circulating return liquid outlet pipeline through the first outlet pipeline of the buffer tank 5 and the circulating return liquid inlet pipeline. When the high-pressure liquid does not enter the circulating hydraulic pump 6, the circulating hydraulic pump 6 has no power source, and then the mixed acid process material further mixed evenly in the buffer tank 5 will enter the second outlet pipeline of the buffer tank 5 and be transferred to the next process.

[0054] In a preferred embodiment of the present invention, an inner extension pipe is provided in the buffer tank 5. The acid mixer 4 is connected to the buffer tank 5 through the inlet pipeline of the buffer tank 5, and the inlet pipeline of the buffer tank 5 is connected to the inner extension pipe. The combined liquid enters the buffer tank 5 through the inner extension pipe, which can avoid the splashing of the combined liquid with pressure and speed in the buffer tank 5 after entering the buffer tank 5. This is because the high-speed liquid spraying will generate friction with the inner wall of the container, which may cause sparks and increase the danger.

[0055] In a preferred embodiment of the present invention, a flow regulating member 14 is provided on the first high-pressure material inlet pipeline of the sulfuric acid dosing hydraulic pump 3 to control the flow rate of the high-pressure liquid entering the sulfuric acid dosing hydraulic pump 3. In the actual production process, the flow rate of the high-pressure liquid in the high-pressure material tank 1 fluctuates. In the present invention, the high-pressure liquid entering the sulfuric acid dosing hydraulic pump 3 is set to a fixed flow rate to ensure the stable operation of the sulfuric acid dosing hydraulic pump 3; the remaining high-pressure liquid will all enter the circulating hydraulic pump 6 to drive the discharge of the buffer tank 5 and perform circulating reflux; the fluctuation of the high-pressure liquid flow rate only affects the reflux amount, and the fluctuation of the reflux amount will not affect the entire device. Specifically, the flow regulating member 14 can be a flow limiting orifice plate or a flow regulating valve.

[0056] In a preferred embodiment of the present invention, a first pressure gauge 11 and a first pressure regulating valve 13 are provided on the circulating return liquid outlet pipeline, and the first pressure regulating valve 13 is communicatively connected to the first pressure gauge 11. The first pressure gauge 11 is used to monitor the pressure of the circulating return liquid outlet pipeline. The operator can adjust the first pressure regulating valve 13 according to the real-time pressure of the first pressure gauge 11 to ensure that the pressure of the circulating return liquid outlet pipeline is within the preset pressure range, and finally ensure that the pressure in the buffer tank 5 is stable within the preset pressure range.

[0057] Exemplarily, compared with the preset pressure range in the circulating return liquid outlet pipeline, if the real-time pressure of the first pressure gauge 11 is higher than this preset pressure range, it indicates that the real-time pressure in the current circulating return liquid outlet pipeline is relatively high. At this time, it is necessary to increase the opening degree of the first pressure regulating valve 13, so that the real-time pressure in the circulating return liquid outlet pipeline decreases, and further ensure that the pressure in the buffer tank 5 can be stabilized within the preset pressure range. Compared with the preset pressure range in the circulating return liquid outlet pipeline, if the real-time pressure of the first pressure gauge 11 is lower than this preset pressure range, it indicates that the real-time pressure in the current circulating return liquid outlet pipeline is relatively low. At this time, it is necessary to decrease the opening degree of the first pressure regulating valve 13, so that the real-time pressure in the outlet pipeline of the circulating hydraulic pump 6 increases, and further ensure that the pressure in the buffer tank 5 can be stabilized within the preset pressure range.

[0058] In a more preferred embodiment of the present invention, a second pressure gauge 12 is provided on the buffer tank. An upstream of the combined main pipeline is provided with a total pipeline for the pressure-reduced process material, and the total pipeline for the pressure-reduced process material is respectively connected to the first outlet pipeline for the pressure-reduced process material and the second outlet pipeline for the pressure-reduced process material; on the total pipeline for the pressure-reduced process material, a second pressure regulating valve 10 is provided. The second pressure gauge 12 and the second pressure regulating valve 10 are communicatively connected. The second pressure gauge 12 is used to monitor the pressure in the buffer tank 5, and the second pressure regulating valve 10 is used to adjust the pressure in the total pipeline for the pressure-reduced process material. The operator can adjust the second pressure regulating valve 10 according to the real-time pressure of the second pressure gauge 12 to ensure that the pressure in the buffer tank 5 is stabilized within the preset pressure range.

[0059] Exemplarily, compared with the preset pressure range in the buffer tank 5, if the real-time pressure of the second pressure gauge 12 is higher than this preset pressure range, it indicates that the real-time pressure in the current total pipeline for the pressure-reduced process material is relatively high. At this time, it is necessary to increase the opening degree of the second pressure regulating valve 10, so that the real-time pressure in the total pipeline for the pressure-reduced process material decreases, and the pressure in the buffer tank 5 can be stabilized within the preset pressure range. Compared with the preset pressure range in the buffer tank 5, if the real-time pressure of the second pressure gauge 12 is lower than this preset pressure range, it indicates that the real-time pressure in the current total pipeline for the pressure-reduced process material is relatively low. At this time, it is necessary to decrease the opening degree of the second pressure regulating valve 10, so that the real-time pressure in the total pipeline for the pressure-reduced process material increases, and the pressure in the buffer tank 5 can be stabilized within the preset pressure range.

[0060] In a preferred embodiment of the present invention, on the dosing medium outlet pipeline (i.e., the sulfuric acid medium outlet pipeline), a feed regulating valve (i.e., sulfuric acid feed regulating valve 7) is provided, and on the inlet pipeline of the buffer tank 5, a pH analyzer 8 is provided. The sulfuric acid feed regulating valve 7 is communicatively connected to the pH analyzer 8. The pH analyzer 8 is used to monitor the pH value of the inlet pipeline of the buffer tank 5. Operators can adjust the sulfuric acid feed regulating valve 7 according to the real-time pH value of the pH analyzer 8 to ensure that the pH value of the combined liquid entering the buffer tank 5 is stably within the preset pH value range.

[0061] Exemplarily, compared with the preset pH value range of the combined liquid, if the real-time pH value of the pH analyzer 8 is higher than this preset pH value range, it indicates that the pH value of the combined liquid is relatively high. At this time, it is necessary to increase the opening degree of the sulfuric acid feed regulating valve 7 to increase the discharge amount of the sulfuric acid storage tank 2, so that the pH value of the combined liquid after acid mixing is within the preset pH value range, achieving the purpose of adjusting the pH value of the process flow. Compared with the preset pH value range of the combined liquid, if the real-time pH value of the pH analyzer 8 is lower than this preset pH value range, it indicates that the pH value of the combined liquid after acid mixing is relatively low. At this time, it is necessary to reduce the opening degree of the sulfuric acid feed regulating valve 7 to reduce the discharge amount of the sulfuric acid storage tank 2, so that the pH value of the combined liquid after acid mixing is within the preset pH value range, achieving the purpose of adjusting the pH value of the process flow.

[0062] In a more preferred embodiment of the present invention, a check valve is provided downstream of the feed regulating valve on the dosing medium outlet pipeline. Specifically in this embodiment, a check valve 9 is provided downstream of the sulfuric acid feed regulating valve 7 to prevent the mutual flow of process materials and sulfuric acid and ensure the normal operation of the entire process flow.

[0063] In summary, the high-pressure liquid in the high-pressure material tank 1 serves as a power source and drives the sulfuric acid dosing hydraulic pump 3 and the circulating hydraulic pump 6 in two ways. In one way, the sulfuric acid dosing hydraulic pump 3 is used to extract sulfuric acid from the sulfuric acid storage tank 2 and make it enter the sulfuric acid outlet pipeline; in the other way, the circulating hydraulic pump 6 is used to circulate and reflux the materials in the buffer tank 5. Among them, the two-way high-pressure liquid is respectively converted into the first pressure-reducing process material and the second pressure-reducing process material and then merged into the total pressure-reducing process material pipeline. The sulfuric acid in the sulfuric acid outlet pipeline, the circulating reflux liquid in the circulating reflux liquid outlet pipeline, and the pressure-reducing process material in the total pressure-reducing process material pipeline all enter the combined main pipeline for merging. After being fully mixed by the acid mixer 4, they enter the downstream buffer tank 5 for further mixing, and finally are transferred to the next process through the second outlet pipeline of the buffer tank 5.

[0064] The circulating hydraulic pump 6 circulates and returns part of the stagnant liquid-phase material in the buffer tank 5 to the inlet of the merging pipeline; it merges with the pressure-reducing process material in the total pressure-reducing process material pipeline at the inlet of the merging pipeline, and then reaches the inlet of the total merging pipeline through the merging pipeline; at the inlet of the total merging pipeline, it merges with the sulfuric acid in the sulfuric acid outlet pipeline, and then turns out after being fully mixed evenly by the acid mixer 4 and the buffer tank 5; part of the merged liquid enters the merging pipeline through the circulating return liquid outlet pipeline. Under the premise of stable high-pressure liquid feeding, it circulates like this all the time. That is, the circulating hydraulic pump 6 establishes a mixed acid material circulation system driven by the high-pressure liquid in the high-pressure material tank 1.

[0065] It should be noted that in the device for hydraulic-driven chemical dosing and material circulation of the present invention, the equipment and pipelines in the entire process flow need to strictly consider their materials, especially pay attention to the acid-proof material performance. In addition, the sulfuric acid chemical dosing in the specific implementation manner of the present invention does not constitute a limitation on the chemical dosing medium of the present invention, but only serves as an example. The device for hydraulic-driven chemical dosing and material circulation of the present invention is also applicable to devices or systems with relatively small chemical dosing amounts such as adding alkali and adding ammonia, and the types of chemical dosing media cover a wide range.

[0066] Example 1

[0067] As Figure 1 shown, this embodiment provides an application of a device for hydraulic-driven chemical dosing and material circulation, which is specifically applied to the production process of propylene oxide.

[0068] In the production process of propylene oxide, the high-pressure liquid-phase process material at 4.0 MPaG is used as the power source to drive the sulfuric acid chemical dosing hydraulic pump 3 and the circulating hydraulic pump 6 respectively. It should be noted that the high-pressure liquid-phase process material at 4.0 MPaG is an intermediate product in the production process of propylene oxide. In the prior art, before mixing the acids, it needs to be decompressed to ensure that the pressure entering the acid mixing process does not exceed 0.7 MPaG. In the present invention, it is not decompressed, and the high-pressure liquid-phase process material at 4.0 MPaG is directly used to drive the sulfuric acid chemical dosing hydraulic pump 3 and the circulating hydraulic pump 6.

[0069] One way, the sulfuric acid chemical dosing hydraulic pump 3 is used to inject the sulfuric acid in the sulfuric acid storage tank 2 into the sulfuric acid outlet pipeline; the other way, the circulating hydraulic pump 6 is used to inject the circulating return liquid into the circulating return liquid outlet pipeline, and then carry out circulating return. Among them, the two-way high-pressure liquids are respectively converted into the first pressure-reducing process material and the second pressure-reducing process material, and merge into the total pressure-reducing process material pipeline. The sulfuric acid in the sulfuric acid outlet pipeline, the circulating return liquid in the circulating return liquid outlet pipeline, and the pressure-reducing process material in the total pressure-reducing process material pipeline all enter the total merging pipeline for merging, and the pressure load after merging drops to 0.9 MPaG.

[0070] During this process, the opening degree of the first pressure regulating valve 13 is adjusted according to the real-time pressure of the first pressure gauge 11; at the same time, the opening degree of the second pressure regulating valve 10 is adjusted according to the real-time pressure of the second pressure gauge 12 to ensure that the pressure in the buffer tank 5 is stabilized at 0.7 MPaG. In addition, the opening degree of the sulfuric acid feed regulating valve 7 is adjusted according to the pH value of the pH analyzer 8 to ensure that the pH value of the process material after mixing acids is stabilized within a preset pH value range.

[0071] The combined liquid at 0.9 MPaG enters the acid mixer 4 through the combined main pipeline. After being mixed in the acid mixer 4, it enters the downstream buffer tank 5 for further thorough mixing, and finally is transferred to the next process through the second outlet pipeline of the buffer tank 5.

[0072] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0073] In the description of the present invention, unless otherwise stated, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0074] The above technical solution is only one implementation manner of the present invention. For those skilled in the art, based on the disclosed principle of the present invention, it is very easy to make various types of improvements or deformations, not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the foregoing description is only preferred and does not have a restrictive meaning.

Claims

1. A device for hydraulic drive of chemical dosing and material circulation, characterized in that: It includes a high-pressure material tank, a chemical dosing storage tank, a chemical dosing hydraulic pump, a circulating hydraulic pump, and a buffer tank; the chemical dosing hydraulic pump and the circulating hydraulic pump are both connected to the high-pressure material tank, the chemical dosing storage tank is connected to the chemical dosing hydraulic pump, and the circulating hydraulic pump is connected to the buffer tank; the chemical dosing hydraulic pump is provided with a first pressure-reducing process material outlet pipeline and a chemical dosing medium outlet pipeline, and the circulating hydraulic pump is provided with a second pressure-reducing process material outlet pipeline and a circulating return liquid outlet pipeline; one end of the first pressure-reducing process material outlet pipeline, the chemical dosing medium outlet pipeline, the second pressure-reducing process material outlet pipeline, and the circulating return liquid outlet pipeline are all connected to one end of a combined main pipeline, and the other end of the combined main pipeline is connected to the buffer tank.

2. The device according to claim 1, characterized in that: A liquid level gauge is provided on the high-pressure material tank; The high-pressure material tank is provided with an outlet pipeline, and the outlet pipeline of the high-pressure material tank is respectively connected to the chemical dosing hydraulic pump and the circulating hydraulic pump; a liquid level regulating valve is provided on the outlet pipeline of the high-pressure material tank; The liquid level gauge is communicatively connected to the liquid level regulating valve.

3. The device according to claim 1, characterized in that: The device for hydraulic-driven chemical dosing and material circulation further includes an acid mixer, one end of the acid mixer is connected to the combined main pipeline, and the other end of the acid mixer is connected to the buffer tank.

4. The device according to claim 3, characterized in that: An inner extension pipe is provided in the buffer tank, the acid mixer is connected to the buffer tank through an inlet pipeline of the buffer tank, and the inlet pipeline of the buffer tank is connected to the inner extension pipe.

5. The device according to claim 1, characterized in that: A first pressure gauge and a first pressure regulating valve are provided on the circulating return liquid outlet pipeline, and the first pressure regulating valve is communicatively connected to the first pressure gauge.

6. The device according to claim 1, characterized in that: A second pressure gauge is provided on the buffer tank; An upstream of the combined main pipeline is provided with a pressure-reducing process material main pipeline, the pressure-reducing process material main pipeline is connected to the combined main pipeline, and the pressure-reducing process material main pipeline is respectively connected to the first pressure-reducing process material outlet pipeline and the second pressure-reducing process material outlet pipeline; a second pressure regulating valve is provided on the pressure-reducing process material main pipeline; The second pressure gauge and the second pressure regulating valve are communicatively connected.

7. The device according to claim 4, characterized in that: A feed regulating valve is provided on the chemical dosing medium outlet pipeline; A pH analyzer is provided on the inlet pipeline of the buffer tank; The feed regulating valve is communicatively connected to the pH analyzer.

8. The device according to claim 7, characterized in that: A check valve is provided downstream of the feed regulating valve on the chemical dosing medium outlet pipeline.

9. The device according to claim 1, characterized in that: The chemical dosing hydraulic pump is provided with a first high-pressure material inlet pipeline, and the first high-pressure material inlet pipeline is connected to the outlet pipeline of the high-pressure material tank; A flow regulating member is provided on the first high-pressure material inlet pipeline.

10. A method for hydraulic drive of chemical dosing and material circulation, characterized in that: Including the following steps S1: The high-pressure liquid in the high-pressure material tank enters the chemical dosing hydraulic pump. The high-pressure liquid drives the chemical dosing hydraulic pump to extract the chemical dosing medium in the chemical dosing storage tank and transport it to the chemical dosing medium outlet pipeline. The high-pressure liquid entering the chemical dosing hydraulic pump is then converted into the first pressure-reducing process material and transferred to the first pressure-reducing process material outlet pipeline; The high-pressure liquid in the high-pressure material tank enters the circulating hydraulic pump. The high-pressure liquid drives the circulating hydraulic pump to extract the circulating return liquid in the buffer tank and transport it to the circulating return liquid outlet pipeline. The high-pressure liquid entering the circulating hydraulic pump is then converted into the second pressure-reducing process material and transferred to the second pressure-reducing process material outlet pipeline; S2: The chemical dosing medium in the chemical dosing medium outlet pipeline, the circulating return liquid in the circulating return liquid outlet pipeline, the first pressure-reducing process material in the first pressure-reducing process material outlet pipeline, and the second pressure-reducing process material in the second pressure-reducing process material outlet pipeline all enter the combined main pipeline and then are transferred to the buffer tank.

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