Chemical adding system for stabilizing magnesium content in ammoniacal salt water

Abstract

The utility model discloses a dosing system for stabilizing magnesium content in ammoniacal brine, which comprises a first mixing module and a second mixing module, a feed port of the first mixing module is connected with a refined brine supply pipe and a magnesium chloride supply pipe, and a discharge port of the first mixing module is connected with a feed end of a premixing unit through a conveying pipeline. The discharging end of the premixing unit is connected with a feeding port of the second mixing module, a cold ammonia brine supply pipe is connected with the feeding end of the premixing unit and the feeding port of the second mixing module through a first switch valve and a second switch valve respectively, and a third switch valve is arranged at the discharging end of the premixing unit. A discharge hole of the second mixing module is connected with an output pipeline; the output pipeline is provided with a sampling and medicine supplementing branch, and the output end of the sampling and medicine supplementing branch is connected with the feeding end of the premixing unit. The device can automatically feed back and adjust the magnesium content in the ammoniacal salt water within a control range, and ensures that the magnesium content in the ammoniacal salt water is stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a dosing device technical field, especially a kind of dosing system of magnesium content stability in ammonia salt water. BACKGROUND

[0002] When heavy ash is prepared by solid phase hydration method, the factors affecting the particle size of heavy ash include alkali water ratio, combined water temperature, hydration time, light ash temperature, and impurity ions in light ash, especially magnesium ions, which generally affect the particle size of heavy ash by controlling magnesium ions in refined salt. Commonly, ammonia salt water and magnesium chloride are mixed in a fixed ratio to prepare production reagents, but due to the loss in the pipeline system, the magnesium ion content in the final cold ammonia salt water is unstable, which cannot meet the control requirements of heavy ash particle size. To eliminate this defect, the content of magnesium chloride needs to be frequently adjusted during actual dosing, which increases the frequency of magnesium addition. Even so, it is still difficult to maintain stable magnesium content. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art. The dosing system for magnesium content stability in ammonia salt water can automatically feedback and adjust the magnesium content in ammonia salt water within the control range, ensuring the stability of magnesium content in ammonia salt water.

[0004] Technical scheme: To achieve the above purpose, the dosing system for magnesium content stability in ammonia salt water of the utility model, including first mixed module and second mixed module, the feed inlet of first mixed module is connected with refined salt water supply pipe and magnesium chloride supply pipe, the discharge port of first mixed module is connected with the feed end of premixing unit through conveying pipeline, the discharge end of premixing unit is connected with the feed inlet of second mixed module, cold ammonia salt water supply pipe is connected with the feed end of premixing unit and the feed inlet of second mixed module through first switch valve and second switch valve respectively, the discharge end of premixing unit is provided with third switch valve, the discharge port of second mixed module is connected with output pipeline.

[0005] The output pipeline is provided with a sampling medicine supplement branch, and the output end of the sampling medicine supplement branch is connected with the feed end of the premixing unit.

[0006] Further, the sampling medicine supplement branch includes a sampling detection pipeline and a magnesium chloride supplement pipeline, the sampling detection pipeline and the magnesium chloride supplement pipeline are connected in parallel, and the inlet end and outlet end of the sampling detection pipeline and the magnesium chloride supplement pipeline are provided with switch valves.

[0007] Further, the sampling detection pipeline includes a content measurement unit, and the content measurement unit is connected with the first switch valve and the second switch valve for control signal transmission; the content measurement unit is connected with the third switch valve for control signal transmission.

[0008] Further, the main pipe of the conveying pipeline is connected with a flow regulating pipe group in series, the flow regulating pipe group comprises a quantitative switch valve and a regulating valve, the quantitative switch valve is connected with the regulating valve in parallel, a merging pipe section after the flow regulating pipe group is provided with a flow measuring unit, and a measurement signal output end of the flow measuring unit is electrically connected with a control signal receiving end of the regulating valve through a control module.

[0009] Further, a control signal output end of the control module is electrically connected with a control signal receiving end of the flow measuring unit.

[0010] Further, the conveying pipeline comprises a conveying pump, a discharge end of the conveying pump is connected with a feeding end of the flow regulating pipe group through a fourth switch valve, and the discharge end of the conveying pump is connected with a backflow port of the first mixing module through a fifth switch valve.

[0011] Beneficial effects: the dosing system with stable magnesium content in ammonia brine can independently dilute when the magnesium content is too high, independently supplement when the magnesium content is too low, ensure the stability of the magnesium content in the finally output cold ammonia brine, and ensure the qualified particle size of heavy ash production. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure schematic view of the dosing system with stable magnesium content in ammonia brine. DETAILED DESCRIPTION

[0013] The dosing system with stable magnesium content in ammonia brine will be further described below with reference to the drawings.

[0014] As shown in the drawings, Figure 1 The dosing system with stable magnesium content in ammonia brine comprises a first mixing module 1 and a second mixing module 2, a feeding port of the first mixing module 1 is connected with a refined salt water supply pipe 3 and a magnesium chloride supply pipe 4, a discharge port of the first mixing module 1 is connected with a feeding end of a premixing unit 6 through a conveying pipeline 5, a discharge end of the premixing unit 6 is connected with a feeding port of the second mixing module 2, a cold ammonia brine supply pipe 7 is connected with the feeding end of the premixing unit 6 and the feeding port of the second mixing module 2 through a first switch valve 71 and a second switch valve 72 respectively, the discharge end of the premixing unit 6 is provided with a third switch valve 61, and a discharge port of the second mixing module 2 is connected with an output pipeline 8; the output pipeline 8 is provided with a sampling medicine supplement branch 9, and an output end of the sampling medicine supplement branch 9 is connected with the feeding end of the premixing unit 6.

[0015] The scheme first stirs and mixes the refined salt water and magnesium chloride in the first mixing module to obtain a magnesium chloride solution, then the magnesium chloride solution is delivered to the premixing unit by the delivery pipeline to be statically premixed with the cold ammonia salt water, and then they are sent together into the second mixing module to achieve full mixing. The premixing unit 6 adopts a static mixer. By setting the first, second and third on-off valves and the medicine supplement branch, when the magnesium content in the final ammonia salt water fluctuates, the flow paths of the solutions are controlled by selectively opening and closing the pipelines, so as to adjust the increase and decrease of the magnesium content. For example, when the magnesium content in the final cold ammonia salt water is too high, the first on-off valve 71 and the third on-off valve 61 are closed, and the second on-off valve is opened, so that the mixing of magnesium chloride and cold ammonia salt water is temporarily stopped, and pure cold ammonia salt water is directly added into the second mixing module to mix and dilute the cold ammonia salt water with high magnesium content. When the magnesium content tends to be normal, the second on-off valve is closed, and the first and third on-off valves are opened to restore the mixing of magnesium chloride and cold ammonia salt water. When the magnesium content in the final cold ammonia salt water is too low, the low-magnesium-content cold ammonia salt water is returned to the premixing unit 6 along the sampling medicine supplement branch 9, and magnesium chloride is supplemented during the return process, so that the low-magnesium-content cold ammonia salt water supplemented with magnesium chloride is delivered to the premixing unit 6 to be mixed with pure cold ammonia salt water and magnesium chloride solution again and then sent into the second mixing module until the magnesium content tends to be normal. In addition, the sample for magnesium content detection can also be returned to the premixing unit 6 by the return method to reduce material waste.

[0016] The sampling medicine supplement branch 9 includes a sampling detection pipeline 91 and a magnesium chloride supplement pipeline 92, the sampling detection pipeline 91 and the magnesium chloride supplement pipeline 92 are connected in parallel, and the inlet and outlet ends of the sampling detection pipeline 91 and the magnesium chloride supplement pipeline 92 are provided with on-off valves. By synchronously opening and closing the on-off valves at the inlet and outlet ends of the corresponding pipelines, the liquid can be selectively controlled to flow through the sampling detection pipeline 91 or the magnesium chloride supplement pipeline 92. The sampling detection pipeline 91 is intermittently opened and closed to realize periodic sample collection for magnesium content detection, and the magnesium chloride supplement pipeline 92 is opened when the magnesium content is detected to be low. The magnesium chloride supplement pipeline 92 is connected to the magnesium chloride supply pipeline 4 through a three-way pipe.

[0017] The sampling detection pipeline 91 includes a content measurement unit 93, and the content measurement unit 93 is connected with the first on-off valve 71 and the second on-off valve 72 for signal transmission. The content measurement unit 93 is connected with the third on-off valve 61 for signal transmission. The content measurement unit 93 adopts a commonly used online magnesium content instrument to measure the magnesium content by sucking a certain amount of magnesium-containing cold ammonia salt water.

[0018] The control signal is generated by detecting the content value to regulate the opening and closing of the first, second and third switch valves, realizing the switching between dilution and normal mixing of the magnesium content.

[0019] The main pipe of the conveying pipeline 5 is connected with a flow regulating pipe group, which includes a quantitative switch valve 51 and a regulating valve 52, the quantitative switch valve 51 is connected with the regulating valve 52 in parallel, and the flow measuring unit 53 is arranged at the confluence pipe section after the flow regulating pipe group, and the measuring signal output end of the flow measuring unit 53 is electrically connected with the control signal receiving end of the regulating valve 52 through the control module 54. The instability of magnesium content is mainly due to the adsorption or interception loss of magnesium ions caused by pipe scarring and fouling, and at the same time, it will hinder the solution delivery and reduce the flow. By detecting the flow at the end of the conveying pipeline, the flow regulating pipe group is appropriately adjusted to compensate for the flow loss, and the flow of the branch pipe where the quantitative switch valve 51 is arranged is affected by the degree of pipe blockage, while the flow of the pipe where the regulating valve 52 is arranged can be adjusted autonomously to compensate for the missing flow due to blockage. When the opening degree of the regulating valve exceeds a certain limit, the reaction pipeline is seriously blocked, and pipeline cleaning is needed.

[0020] The control signal output end of the control module 54 is electrically connected with the control signal receiving end of the content measuring unit 93. The reduction of flow reflects the loss of magnesium to a certain extent, when the flow is detected to be reduced, the content measuring unit 93 is controlled to increase the frequency of sampling detection, and then the real-time and accuracy of monitoring the change of magnesium content are improved.

[0021] The conveying pipeline 5 includes a conveying pump 50, the discharge end of the conveying pump 50 is connected with the feeding end of the flow regulating pipe group through the fourth switch valve 55, and the discharge end of the conveying pump 50 is connected with the backflow port of the first mixing module 1 through the fifth switch valve 56. In the case that the work rate of the conveying pump 50 is unchanged, the fifth switch valve 56 is controlled to be opened and closed by detecting the internal pressure of the conveying pipe at the outlet of the conveying pump 50, so that part of the magnesium chloride solution is backflowed to the first mixing module to relieve the pipe pressure when the flow is reduced due to pipe scarring and fouling, and the fifth switch valve is closed again when the pipe flow is adjusted to normal.

[0022] Preferably, the end of the delivery pipeline 5 and the end of the output pipeline 8 are provided with on-off valves, when the magnesium content is over-standard or too low, the sampling and medicine supplement branch 9, the premixing unit, the second mixing module and the output pipeline form an internal circulation system by simultaneously closing the on-off valves at the two ends, when the magnesium content is over-standard, the first on-off valve 71 and the third on-off valve 61 are opened, the second on-off valve 72 and the magnesium chloride supplement pipeline are closed, so that the pure cold ammonia brine is mixed with the sampling backflow in the premixing unit and then sent to the second mixing module, the sampling detection pipeline keeps periodic sampling until the magnesium content in the detection result is up to standard, then the on-off valves at the ends of the delivery pipeline 5 and the output pipeline 8 are opened again. Similarly, when the magnesium content is too low, the third on-off valve 61 and the magnesium chloride supplement pipeline are opened, the first on-off valve 71 and the second on-off valve 72 are closed in the internal circulation system, the sampling detection pipeline keeps periodic sampling, so that the low-magnesium-content cold ammonia brine in the second mixing module is circulated back along the magnesium chloride supplement pipeline, continuously adding medicine, until the magnesium content detection result is up to standard, then the normal communication relationship is restored, so that when the magnesium content is too high or too low, the output is not directly performed, but through the internal circulation mode, the magnesium content in the second module is ensured to return to normal before output, the magnesium content in the output cold ammonia brine is strictly controlled in the control range, the stability of the magnesium content is improved, and the qualified particle size of the fly ash production is ensured.

[0023] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A dosing system for stabilizing magnesium content in ammonia brine, characterized by: The system comprises a first mixing module (1) and a second mixing module (2), the feed inlet of the first mixing module (1) is connected with a refined brine supply pipe (3) and a magnesium chloride supply pipe (4), the feed outlet of the first mixing module (1) is connected with the feed end of a premixing unit (6) through a conveying pipe (5), the discharge end of the premixing unit (6) is connected with the feed inlet of the second mixing module (2), a cold ammonia brine supply pipe (7) is connected with the feed end of the premixing unit (6) and the feed inlet of the second mixing module (2) through a first switch valve (71) and a second switch valve (72) respectively, the discharge end of the premixing unit (6) is provided with a third switch valve (61), and the discharge outlet of the second mixing module (2) is connected with an output pipe (8). The output pipe (8) is provided with a sampling medicine supplement branch (9), and the output end of the sampling medicine supplement branch (9) is connected with the feed end of the premixing unit (6).

2. The dosing system of claim 1, wherein the magnesium content of the ammonia brine is stabilized. The sampling medicine supplement branch (9) comprises a sampling detection pipeline (91) and a magnesium chloride supplement pipeline (92), the sampling detection pipeline (91) and the magnesium chloride supplement pipeline (92) are connected in parallel, and the inlet end and the outlet end of the sampling detection pipeline (91) and the magnesium chloride supplement pipeline (92) are provided with switch valves.

3. The dosing system of claim 2, wherein the magnesium content of the ammonia brine is stabilized. The sampling detection pipeline (91) comprises a content measuring unit (93), the content measuring unit (93) is in signal transmission connection with the first switch valve (71) and the second switch valve (72), and the content measuring unit (93) is in signal transmission connection with the third switch valve (61).

4. The dosing system of claim 3, wherein the magnesium content of the ammonia brine is stabilized. A flow regulating pipe group is connected in series in the main pipe of the conveying pipe (5), the flow regulating pipe group comprises a quantitative switch valve (51) and a regulating valve (52), the quantitative switch valve (51) and the regulating valve (52) are connected in parallel, a confluence pipe section after the flow regulating pipe group is provided with a flow measuring unit (53), and a measurement signal output end of the flow measuring unit (53) is electrically connected with a control signal receiving end of the regulating valve (52) through a control module (54).

5. The dosing system of claim 4, wherein the magnesium content of the ammonia brine is stabilized. A control signal output end of the control module (54) is electrically connected with a control signal receiving end of the content measuring unit (93).

6. The dosing system of claim 5, wherein the magnesium content of the ammonia brine is stabilized. The conveying pipe (5) comprises a conveying pump (50), a discharge end of the conveying pump (50) is connected with the feed end of the flow regulating pipe group through a fourth switch valve (55), and the discharge end of the conveying pump (50) is connected with a backflow port of the first mixing module (1) through a fifth switch valve (56).

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