Desulfurizing absorption tower pH meter and densitometer system assembly

Abstract

The utility model provides a desulfurizing absorption tower pH meter and densitometer system assembly which comprises a first slurry circulating pump and a second slurry circulating pump which are respectively connected to two slurry circulating paths of a desulfurizing absorption tower; the drainage pipeline is connected between an outlet pipeline of the first slurry circulating pump and an outlet pipeline of the second slurry circulating pump; the backflow pipeline is connected between an inlet pipeline of the first slurry circulating pump and an inlet pipeline of the second slurry circulating pump; the measuring pipeline is connected between the drainage pipeline and the backflow pipeline; the densimeter is vertically connected to the measuring pipeline; and the two pH meters are connected to the densitometer through pipelines. According to the utility model, through a set of pH meter and density meter equipment, the measurement of pH values and density values of the two groups of slurry circulating pumps when one is selected to be started or the two groups of slurry circulating pumps are jointly started can be realized, so that the detection efficiency of the set of pH meter and density meter equipment is improved. A gypsum discharge pump, an absorption tower connector and a pit pump are omitted, so that abrasion and corrosion are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization absorption towers, in particular to a desulfurization absorption tower pH meter and density meter system assembly. Background Art

[0002] The pH value and density value of the slurry in the absorption tower of the desulfurization system of a thermal power plant must be guaranteed to be accurately measured online so that the slurry supply and gypsum dehydration can be accurately adjusted according to the pH value and density value to maintain normal desulfurization efficiency and outlet sulfur dioxide concentration. At present, the main arrangements of the pH meter and density meter measuring device of the absorption tower of the limestone wet flue gas desulfurization system are: arranged on the outlet pipe of the gypsum discharge pump, arranged at the 1.5-meter elevation of the absorption tower to flow to the pit through the pH meter and density meter, and arranged at the main pipe of the slurry circulation pump pressure gauge to return to the inlet pipe of the slurry circulation pump after passing through a pH meter and density meter (horizontally placed). This arrangement process has its own advantages and disadvantages.

[0003] (1) The arrangement on the outlet pipe of the gypsum discharge pump requires the uninterrupted operation of the gypsum discharge pump of the absorption tower, which consumes a lot of power and causes a lot of wear. For example, the Chinese patent CN206168214U published on May 17, 2017;

[0004] (2) The pipeline connected to the absorption tower at an elevation of 1.5 meters flows through the pH meter and density meter to the pit by gravity, which requires the absorption tower pit pump to be frequently started more than 50 times a day, consuming a lot of power and causing a lot of pipe wear. For example, the Chinese patent CN204735103U published on November 4, 2015;

[0005] (3) The pressure gauge is arranged at the main pipe of the slurry circulation pump and then flows back to the inlet pipe of the slurry circulation pump through a pH meter and a density meter (placed horizontally). The arrangement of a pH meter does not comply with the design requirements and the horizontal placement of the density meter affects the data measurement.

[0006] (4) The desulfurization absorption tower generally has multiple groups of slurry circulation paths, but the existing technology is to set a density meter and a pH meter for a single slurry circulation path. Multiple groups of slurry circulation paths need to be configured with multiple groups of density meters and pH meters, resulting in low detection efficiency of the density meters and pH meters.

[0007] Therefore, what needs to be solved now is: by remodeling the arrangement of the measuring device for the pH value and density value of the slurry in the absorption tower of the desulfurization system of the thermal power plant, the online detection efficiency of the pH meter and the density meter can be improved, the problems in (1), (2), (3) and (4) can be reduced, and the technical goal of online continuous operation monitoring of the pH meter and the density meter and zero discharge of the slurry can be achieved, thereby improving the desulfurization efficiency. Utility Model Content

[0008] The purpose of the utility model is to provide a desulfurization absorption tower pH meter and density meter system assembly, which can improve the online detection efficiency of the pH meter and the density meter, and achieve the technical goal of online continuous operation monitoring of the pH meter and the density meter and zero discharge of slurry;

[0009] The utility model provides a desulfurization absorption tower pH meter and density meter system assembly, comprising: a first slurry circulation pump and a second slurry circulation pump, which are respectively connected to two slurry circulation paths of the desulfurization absorption tower; a drainage pipeline, which is connected between the outlet pipeline of the first slurry circulation pump and the outlet pipeline of the second slurry circulation pump; a reflux pipeline, which is connected between the inlet pipeline of the first slurry circulation pump and the inlet pipeline of the second slurry circulation pump; a measuring pipeline, which is connected between the drainage pipeline and the reflux pipeline; a density meter, which is vertically connected to the measuring pipeline; and two pH meters, which are connected to the density meter through pipelines.

[0010] Furthermore, the measuring pipeline includes a first vertical branch, a horizontal branch and a second vertical branch, the first vertical branch is vertically connected to the drainage pipeline, the second vertical branch is vertically connected to the return pipeline, the horizontal branch is transversely connected between the first vertical branch and the second vertical branch, and the density meter is vertically connected to the horizontal branch.

[0011] Furthermore, the pipeline connected to the pH meter is connected to the transverse branch pipe via a bypass pipeline.

[0012] Furthermore, a valve is provided on the transverse branch pipe, the valve is located on the downstream side of the connection between the densitometer and the transverse branch pipe, and the valve is located on the upstream side of the connection between the bypass pipe and the transverse branch pipe.

[0013] Furthermore, a flushing water interface is provided on the drainage pipe.

[0014] Furthermore, a valve is provided on the flushing water interface.

[0015] Furthermore, the reflux pipe is connected to a discharge pipe, and the discharge pipe is connected to the absorption tower pit.

[0016] Furthermore, a valve is provided on the discharge pipeline.

[0017] Furthermore, valves are respectively provided on both sides of the drainage pipe at the connection with the measuring pipe; and valves are respectively provided on both sides of the return pipe at the connection with the measuring pipe.

[0018] Furthermore, the outlet pipe of the first slurry circulation pump and the outlet pipe of the second slurry circulation pump are respectively connected to a bottom row sampling pipe, the bottom row sampling pipe is connected to the pit, the two ends of the return pipe are respectively connected to different bottom row sampling pipes, and a valve is provided on the bottom row sampling pipe on the downstream side of the return pipe.

[0019] The technical solution of the utility model is to lead out the sampling slurry from the short pipes of the two slurry circulation pump outlets, and then enter the measuring pipe through the drainage pipe, first pass through the vertically installed density meter in the measuring pipe, and then pass through two pH meters, and then be discharged to the corresponding slurry circulation pump inlet bottom row sampling pipe through the reflux pipe. The utility model can realize the pH value and density value measurement of two groups of slurry circulation pumps when one is selected to be activated, or when they are activated together, through a set of pH meter and density meter equipment, thereby improving the detection efficiency of a set of pH meter and density meter equipment. Since the gypsum discharge pump, absorption tower connection port, and pit pump are cancelled, the long-term continuous operation of the gypsum discharge pump, the frequent start and stop of the absorption tower pit pump and the high failure rate, the complex system, the arrangement of one pH meter that does not meet the design requirements, and the horizontal placement of the density meter affecting the data measurement are avoided, and the wear and corrosion of the gypsum discharge pump, the pit pump, the outlet pipe and accessories are reduced, and the technical goal of online continuous operation monitoring of the density meter and two pH meters and zero discharge of slurry is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is the overall schematic diagram of the system of the utility model;

[0022] Description of reference numerals:

[0023] 101-the outlet pipe of the first slurry circulation pump, 102-the inlet pipe of the first slurry circulation pump;

[0024] 201 - outlet pipe of the second slurry circulation pump, 202 - inlet pipe of the second slurry circulation pump;

[0025] 3- drainage pipe, 4- return pipe;

[0026] 5-measuring pipe, 501-first vertical branch pipe, 502-second vertical branch pipe, 503-horizontal branch pipe;

[0027] 6-density meter, 7-two pH meters, 8-bypass pipe, 9-flushing water interface, 10-discharge pipe, 11-bottom row sampling pipe, 12-pit. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Example 1

[0032] like Figure 1As shown, the utility model provides a desulfurization absorption tower pH meter and density meter system assembly, including: a first slurry circulation pump and a second slurry circulation pump, which are respectively connected to two slurry circulation paths of the desulfurization absorption tower; a drainage pipe 3, connected between the outlet pipe 101 of the first slurry circulation pump and the outlet pipe 201 of the second slurry circulation pump; a reflux pipe 4, connected between the inlet pipe 102 of the first slurry circulation pump and the inlet pipe 202 of the second slurry circulation pump; a measuring pipe 5, connected between the drainage pipe 3 and the reflux pipe 4; a density meter 6, vertically connected to the measuring pipe 5; two pH meters 7, connected to the density meter 6 through pipes.

[0033] Specifically, the first slurry circulation pump and the second slurry circulation pump are two groups of circulation loops connected to the same desulfurization absorption tower, which is the content of the prior art, and its structure is not repeated. In the general structure of the prior art, four or five groups of slurry circulation loops are set on the same desulfurization absorption tower, and at least one of these slurry circulation loops is required to be in working state. Therefore, in this embodiment, more groups of slurry circulation pumps can also be set, which are connected together through the drainage pipe 3, and then these drainage pipes 3 are connected to the measuring pipe 5; so that when a certain group of slurry circulation pumps is working and other groups of slurry circulation pumps are not working, the density meter 6 and the two pH meters 7 can measure the density and pH value; or when some or all groups of slurry circulation pumps are working, the density meter 6 and the two pH meters 7 can also measure the density and pH value. Therefore, the utility model can realize the measurement of pH and density values ​​of two groups of slurry circulation pumps when one is selected to be activated or when they are activated together through a set of pH meters and density meter equipment.

[0034] Due to the outlet pressure of the slurry circulation pump, part of the slurry will enter the drainage pipe 3, and then pass through the density meter 6 and two pH meters 7 in the measuring pipe 5 to measure the density and pH values, and then flow back through the reflux pipe 4 to the first slurry circulation pump inlet pipe or the second slurry circulation pump inlet pipe.

[0035] In this embodiment, the density meter 6 is vertically arranged, and the data measurement accuracy is higher; two pH meters 7 are used, which meets the design requirements.

[0036] Example 2

[0037] The measuring pipeline 5 includes a first vertical branch 501, a horizontal branch 503 and a second vertical branch 502. The first vertical branch 501 is vertically connected to the drainage pipeline 3, the second vertical branch 502 is vertically connected to the return pipeline 4, the horizontal branch 503 is horizontally connected between the first vertical branch 501 and the second vertical branch 502, and the density meter 6 is vertically connected to the horizontal branch 503.

[0038] Specifically, the measuring pipe 5 has a two-section bending structure, in which the first vertical branch pipe 501 and the second vertical branch pipe 502 of the upper and lower sections are vertically arranged, and the middle horizontal branch pipe 503 is horizontally arranged, thereby forming a two-section bending structure, so that the density meter 6 can be vertically connected to the horizontal branch pipe 503. When the density meter 6 is placed vertically, its measurement result is more accurate.

[0039] Example 3

[0040] The pipeline connecting the two pH meters 7 is connected to the horizontal branch pipe 503 through a bypass pipeline 8. The horizontal branch pipe 503 is provided with a valve, which is located at the downstream side of the connection between the density meter 6 and the horizontal branch pipe 503, and the valve is located at the upstream side of the connection between the bypass pipeline 8 and the horizontal branch pipe 503.

[0041] Specifically, two pH meters 7 are installed in a sealed pipeline structure and connected to the density meter 6 through a short pipe, so the slurry enters the pipeline connected to the pH meter after passing through the density meter 6, so that the pH meter can measure the pH value.

[0042] One end of the bypass pipe 8 is connected to the pipe connecting the two pH meters 7, and the other end is connected to the measuring pipe 5. By designing the bypass pipe 8, free switching during calibration can be achieved. For example, in the normal measurement state, the valve between the density meter 6 and the bypass pipe 8 is kept closed, so that the measured slurry passes through the density meter 6, the pH meter and the bypass pipe 8 in sequence, and the density value and the pH value can be measured; when the density meter 6 and the pH meter need to be repaired or replaced, the valve between the density meter 6 and the bypass pipe 8 can be opened, the valve between the density meter 6 and the measuring pipe 5 (not shown) can be closed, and the valve on the bypass pipe 8 (not shown) can be closed, so that the density meter 6 and the pH meter can be disassembled, and the slurry still passes through the path of the drainage pipe 3-measuring pipe 5-return pipe 4.

[0043] Example 4

[0044] The drainage pipe 3 is provided with a flushing water interface 9. A valve is provided on the flushing water interface 9. The reflux pipe 4 is connected with a discharge pipe 10, and the discharge pipe 10 is connected to the absorption tower pit 12. A valve is provided on the discharge pipe 10.

[0045] Specifically, the inside of the pipeline system can be flushed through the flushing water interface 9. For example, if a slurry circulation pump that was originally working stops working (the measurement loop is transferred to another slurry circulation pump), slurry will accumulate inside the drainage pipe 3 connected to it, and it needs to be flushed and cleaned. At this time, the flushing water is connected, and the valve on the drainage pipe 3 is opened, and the accumulated slurry can be flushed back to the outlet pipe of the slurry circulation pump. Alternatively, the flushing water can be directly connected from the flushing water interface 9, through the drainage pipe 3, the measuring pipe 5, the return pipe 4 and the discharge pipe 10, and finally discharged into the pit 12, so as to realize the flushing and cleaning of the entire measuring pipe 5 path. The valve on the discharge pipe 10 is kept closed.

[0046] Example 5

[0047] Valves are respectively provided on both sides of the drainage pipe 3 at the connection with the measuring pipe 5; valves are respectively provided on both sides of the return pipe 4 at the connection with the measuring pipe 5. The outlet pipe 101 of the first slurry circulation pump and the outlet pipe 201 of the second slurry circulation pump are respectively connected with bottom row sampling pipes 11, which are connected to the pit 12. The two ends of the return pipe 4 are respectively connected to different bottom row sampling pipes 11, and a valve is provided on the bottom row sampling pipe 11 at the downstream side of the return pipe 4.

[0048] Specifically, a slurry circulation pump is controlled to be connected to the measurement path through the valve on the drainage pipe 3; the measured slurry is controlled to flow back to a slurry circulation pump through the valve on the return pipe 4. Through the bottom discharge sampling pipe 11, the measured slurry can flow back to the inlet pipe of the slurry circulation pump when the valve is closed; after the valve is opened, the circulating slurry can be discharged into the pit 12 for sampling.

[0049] The specific working mode and principle of this utility model:

[0050] The sampling slurry is drawn out from the short pipes at the outlet of the two slurry circulation pumps, and then enters the measuring pipe 5 through the drainage pipe 3. In the measuring pipe 5, it first passes through the vertically installed density meter 6, and then passes through two pH meters, and then is discharged to the corresponding slurry circulation pump inlet bottom discharge sampling pipe 11 through the reflux pipe 4. The utility model can realize the pH value and density value measurement of two groups of slurry circulation pumps when one is selected to be activated, or when they are activated together, through a set of pH meter and density meter equipment, thereby improving the detection efficiency of a set of pH meter and density meter equipment. The utility model does not require a gypsum discharge pump, an absorption tower connection port, a pit pump, etc., avoids wear and corrosion of the gypsum discharge pump, the pit pump, the outlet pipe and accessories, and realizes the technical goal of online continuous operation monitoring of the density meter 6 and the two pH meters 7 and zero discharge of slurry. By designing a bypass pipe 8, free switching during calibration can be achieved.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A desulfurization absorption tower pH meter and density meter system assembly, characterized in that: include: The first slurry circulation pump and the second slurry circulation pump are respectively connected to two slurry circulation paths of the desulfurization absorption tower; a drainage pipe connected between the outlet pipe of the first slurry circulation pump and the outlet pipe of the second slurry circulation pump; a reflux pipe connected between the inlet pipe of the first slurry circulation pump and the inlet pipe of the second slurry circulation pump; A measuring pipe connected between the drainage pipe and the return pipe; A density meter, vertically connected to the measuring pipe; Two pH meters are connected to the density meter through pipes.

2. The desulfurization absorption tower pH meter and density meter system assembly according to claim 1 is characterized in that: The measuring pipeline includes a first vertical branch, a horizontal branch and a second vertical branch. The first vertical branch is vertically connected to the drainage pipeline, the second vertical branch is vertically connected to the return pipeline, the horizontal branch is transversely connected between the first vertical branch and the second vertical branch, and the density meter is vertically connected to the horizontal branch.

3. The desulfurization absorption tower pH meter and density meter system assembly according to claim 2 is characterized in that: The pipeline connected to the pH meter is connected to the transverse branch pipe through a bypass pipeline.

4. The desulfurization absorption tower pH meter and density meter system assembly according to claim 3 is characterized in that: The transverse branch pipe is provided with a valve, the valve is located at the downstream side of the connection between the densitometer and the transverse branch pipe, and the valve is located at the upstream side of the connection between the bypass pipeline and the transverse branch pipe.

5. The desulfurization absorption tower pH meter and density meter system assembly according to claim 1, characterized in that: A flushing water interface is provided on the drainage pipeline.

6. The desulfurization absorption tower pH meter and density meter system assembly according to claim 5, characterized in that: A valve is provided on the flushing water interface.

7. The desulfurization absorption tower pH meter and density meter system assembly according to claim 5, characterized in that: The reflux pipeline is connected with a discharge pipeline, and the discharge pipeline is connected to the absorption tower pit.

8. The desulfurization absorption tower pH meter and density meter system assembly according to claim 7, characterized in that: The discharge pipeline is provided with a valve.

9. The desulfurization absorption tower pH meter and density meter system assembly according to claim 1, characterized in that: Valves are respectively arranged on both sides of the drainage pipe at the connection with the measuring pipe; valves are respectively arranged on both sides of the return pipe at the connection with the measuring pipe.

10. The desulfurization absorption tower pH meter and density meter system assembly according to claim 1, characterized in that: The outlet pipe of the first slurry circulation pump and the outlet pipe of the second slurry circulation pump are respectively connected to a bottom row sampling pipe, and the bottom row sampling pipe is connected to a pit. Both ends of the return pipe are respectively connected to different bottom row sampling pipes, and a valve is provided on the bottom row sampling pipe on the downstream side of the return pipe.

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