CN112169575A - Device and method for measuring pH and density of slurry in absorption tower - Google Patents

Device and method for measuring pH and density of slurry in absorption tower Download PDF

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CN112169575A
CN112169575A CN202011056489.6A CN202011056489A CN112169575A CN 112169575 A CN112169575 A CN 112169575A CN 202011056489 A CN202011056489 A CN 202011056489A CN 112169575 A CN112169575 A CN 112169575A
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storage tank
slurry
pipe
absorption tower
density
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亓树华
刘涛
尚念新
马泽超
侯玉忠
刘军
冯元哲
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Huaneng Laiwu Power Generation Co Ltd
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Huaneng Laiwu Power Generation Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/606—Carbonates

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  • Environmental & Geological Engineering (AREA)
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Abstract

本发明公开了吸收塔浆液PH和密度的测量装置，包括与吸收塔底部连接的自流管、与自流管连接第一储存罐以及与第一储存罐连接的第二储存罐；在检测管上顺序安装浆液开关阀、PH检测仪和密度检测仪；所述第一储存罐的底部通过连接管与第二储存罐顶部连接，在连接管上安装电动开关阀；第二储存罐的底部出液口通过回流管与吸收塔顶部进液口连接；在第二储存罐的顶部安装加压管和泄压管，在加压管上安装加压泵，在泄压管上安装电动减压阀，在第二储存罐的中上部安装上液位检测传感器，在第二储存罐的底部安装下液位检测传感器。本发明无浆液泵，避免了浆液对浆液泵冲刷，无需频繁停机更换浆液泵，保证了工作效率，保证了正常工作的进行。

Figure 202011056489

The invention discloses a measuring device for PH and density of an absorption tower slurry, comprising an artesian pipe connected to the bottom of the absorption tower, a first storage tank connected to the artesian pipe, and a second storage tank connected to the first storage tank; Install slurry switch valve, PH detector and density detector; the bottom of the first storage tank is connected to the top of the second storage tank through a connecting pipe, and an electric switch valve is installed on the connecting pipe; the bottom liquid outlet of the second storage tank It is connected with the liquid inlet at the top of the absorption tower through the return pipe; the pressure pipe and the pressure relief pipe are installed on the top of the second storage tank, the pressure pump is installed on the pressure pipe, and the electric pressure reducing valve is installed on the pressure relief pipe. A liquid level detection sensor is installed on the middle and upper part of the second storage tank, and a lower liquid level detection sensor is installed at the bottom of the second storage tank. The invention has no slurry pump, avoids the slurry scouring the slurry pump, does not need to stop frequently to replace the slurry pump, ensures the working efficiency and ensures the normal operation.

Figure 202011056489

Description

Device and method for measuring pH and density of slurry in absorption tower
Technical Field
The invention relates to the technical field of environmental protection, in particular to a device and a method for measuring pH and density of slurry in an absorption tower.
Background
The electric power structure of China is mainly thermal power, and a thermal power plant is a sulfur dioxide emission amplifying household. In order to reduce the emission of a large amount of sulfur dioxide, most of domestic coal-fired units are provided with flue gas desulfurization systems at present, and a limestone-gypsum wet desulfurization process is taken as a main process, namely, a large amount of limestone is added into an absorption tower to absorb the sulfur dioxide, so that the aim of removing the sulfur dioxide is fulfilled.
The pH value and density of the slurry in the absorption tower are important monitoring indexes for the operation of the desulfurization system. If the pH value of the slurry is too low, the sulfur dioxide absorption effect is poor, and the desulfurization efficiency is low; if the pH value is too high, the utilization rate of limestone and the purity of gypsum are low, which is not beneficial to the desulfurization reaction. If the density of the slurry is too low, the content of limestone and gypsum in the slurry is low, the desulfurization efficiency is low, and the water content of the gypsum is high; if the slurry density is too high, the equipment abrasion and the system operation power consumption are large, and the problems of reduction of the desulfurization efficiency, high water content of gypsum and the like are caused. Present pH value and density's measurement is generally taken out the thick liquid from the absorption tower bottom through the thick liquid pump, then the pump returns to absorption tower top, installation PH measuring apparatu and density measuring apparatu on the pipeline, carry out PH measurement and density measurement through PH measuring apparatu and density measuring apparatu, when measuring through this kind of mode, the thick liquid erodees the thick liquid pump seriously, the life of thick liquid pump is very short, need frequent shut down to change the thick liquid pump, influence work efficiency, PH measurement and density measurement accuracy are lower simultaneously.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide a device and a method for measuring the PH and the density of slurry in an absorption tower, and the invention has no slurry pump, avoids the slurry pump from being washed by the slurry, does not need to be frequently stopped and replaced, ensures the working efficiency and ensures the normal work; the arrangement of the inverted U-shaped pipe ensures that the pulp in the detection pipe is full, and the preparation of PH measurement and density measurement is ensured.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a device for measuring the PH and density of slurry in an absorption tower, which comprises a gravity flow pipe connected with the bottom of the absorption tower, a first storage tank connected with the gravity flow pipe, and a second storage tank connected with the first storage tank; the gravity flow pipe comprises a detection pipe and an inverted U-shaped pipe connected with the detection pipe, the upper end of the detection pipe is connected with a liquid outlet at the bottom of the absorption tower, the lower end of the detection pipe is connected with an inlet of the inverted U-shaped pipe, and an outlet at the lower end of the inverted U-shaped pipe is connected with a liquid inlet at the top of the first storage tank; a slurry switch valve, a PH detector and a density detector are sequentially arranged on the detection pipe; the bottom of the first storage tank is connected with the top of the second storage tank through a connecting pipe, and an electric switch valve is installed on the connecting pipe; a liquid outlet at the bottom of the second storage tank is connected with a liquid inlet at the top of the absorption tower through a return pipe; install pressure pipe and pressure release pipe at the top of second holding vessel, install the force (forcing) pump on the pressure pipe, install electronic relief pressure valve on the pressure release pipe, install level detection sensor on the well upper portion of second holding vessel, level detection sensor under the bottom installation of second holding vessel, installation manometer on the second holding vessel.
Preferably, the highest position of the inverted U-shaped pipe is higher than the installation position of the PH detector. The slurry filling at the positions of the PH detector and the density detector can be ensured, and the detection accuracy is ensured.
Preferably, the height difference between the first storage tank and the liquid outlet at the bottom of the absorption tower is 3-4 m. The slurry flows out from the bottom of the absorption tower in a self-flowing mode, flows through the PH detector and the density detector and then enters the first storage tank for storage.
Preferably, the connecting pipe is provided with a plurality of connecting pipes, and each connecting pipe is provided with an electric switch valve.
Preferably, the second storage tank is located lower than the first storage tank.
Preferably, the upper liquid level detection sensor, the lower liquid level detection sensor and the pressure gauge are connected with the input end of the controller, and the pressure pump, the electric pressure reducing valve and the electric switch valve are respectively connected with the output end circuit of the controller.
In a second aspect of the present invention, there is provided a method for measuring PH and density of slurry in an absorption tower by using the above-mentioned measuring apparatus, comprising the steps of: firstly, opening a slurry switch valve on a detection pipe and an electric switch valve on a connecting pipe, enabling slurry to enter a first storage tank through a self-flowing pipe and then to automatically flow to a second storage tank through the connecting pipe, closing the electric switch valve when the slurry reaches the position of an upper liquid level detection sensor, pressurizing the second storage tank by a pressurizing pump, and enabling the slurry in the second storage tank to flow back to an absorption tower under the action of pressure; when the slurry reaches below the lower liquid level detection sensor, the electric pressure reducing valve is opened to relieve pressure of the second storage tank, after pressure relief is completed, the electric switch valve is opened, and the slurry enters the second storage tank again from the first storage tank.
The invention has the beneficial effects that:
the slurry pump is not needed, so that the slurry pump is prevented from being washed by slurry, the slurry pump does not need to be frequently stopped and replaced, the working efficiency is ensured, and the normal operation is ensured; the arrangement of the inverted U-shaped pipe ensures that the pulp in the detection pipe is full, and the preparation of PH measurement and density measurement is ensured.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. absorption tower, 2, first holding vessel, 3, second holding vessel, 4, test tube, 5, fall U type pipe, 6, thick liquid ooff valve, 7, PH detector, 8, density detector, 9, connecting pipe, 10, electronic ooff valve, 11, force (forcing) pump, 12, electronic relief pressure valve, 13, go up liquid level detection sensor, 14, lower liquid level detection sensor, 15, manometer, 16, back flow.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention are all conventional in the art and commercially available.
As shown in fig. 1, the apparatus for measuring PH and density of slurry in an absorption tower according to the present invention comprises a gravity pipe connected to the bottom of an absorption tower 1, a first storage tank 2 connected to the gravity pipe, and a second storage tank 3 connected to the first storage tank 2.
The gravity flow pipe comprises a detection pipe 4 and an inverted U-shaped pipe 5 connected with the detection pipe 4, the upper end of the detection pipe 4 is connected with a liquid outlet at the bottom of the absorption tower 1, the lower end of the detection pipe 4 is connected with an inlet of the inverted U-shaped pipe 5, and a lower end outlet of the inverted U-shaped pipe 5 is connected with a liquid inlet at the top of the first storage tank 2. A slurry switch valve 6, a pH detector 7 and a density detector 8 are sequentially installed on the detection pipe 4.
In this embodiment, in order to ensure that the slurry at the positions of the PH detector 7 and the density detector 8 is full and the detection accuracy is ensured, the highest position of the inverted U-shaped pipe 5 is higher than the installation position of the PH detector 7. The slurry flows out from the bottom of the absorption tower 1 in a self-flowing mode, flows through a PH detector 7 and a density detector 8, and then enters a first storage tank 2 for storage. In this embodiment, the height difference between the first storage tank 2 and the liquid outlet at the bottom of the absorption tower 1 is 3-4 m.
The bottom of first holding vessel 2 is passed through connecting pipe 9 and is connected with 3 tops of second holding vessel, installs electronic ooff valve on connecting pipe 9, the position of second holding vessel 3 is less than first holding vessel 2, and the thick liquid gets into second holding vessel 3 by first holding vessel 2 through the mode of flowing certainly. The liquid outlet at the bottom of the second storage tank 3 is connected with the liquid inlet at the top of the absorption tower 1 through a return pipe 16. The connecting pipes 9 are multiple, and each connecting pipe 9 is provided with an electric switch valve 10.
Install pressure pipe and pressure release pipe at the top of second holding vessel 3, install force (forcing) pump 11 on the pressure pipe, install electronic relief pressure valve 12 on the pressure release pipe, install level detection sensor 13 on the well upper portion of second holding vessel 3, level detection sensor 14 under the bottom installation of second holding vessel 3, install manometer 15 on second holding vessel 3. The upper liquid level detection sensor 13, the lower liquid level detection sensor 14 and the pressure gauge 15 are connected with the input end of the controller, and the pressure pump 11, the electric pressure reducing valve 12 and the electric switch valve 10 are respectively connected with the output end circuit of the controller. The structural principles and circuit connection parts of the upper liquid level detection sensor 13, the lower liquid level detection sensor 14, the pressure gauge 15, the pressure pump 11, the electric pressure reducing valve 12, the electric switch valve 10 and the controller are known to those skilled in the art, and are also explicitly described in related patent documents, so detailed description of the connection relationship and structure of the circuit is omitted.
When the slurry reaches the position of the upper liquid level detection sensor 13, the upper liquid level detection sensor 13 transmits a signal to the controller, the controller controls the electric switch valve 10 to be closed and controls the pressure pump 11 to pressurize the second storage tank 3, the slurry in the second storage tank 3 flows back to the absorption tower 1 under the action of pressure, when the slurry reaches the position below the lower liquid level detection sensor 14, the lower liquid level detection sensor 14 transmits a signal to the controller, the controller controls the electric pressure reducing valve 12 to be decompressed and opens the electric switch valve 10, so that the slurry enters the second storage tank 3 again from the first storage tank 2, and the working process is circulated.
The method for measuring the PH and the density of the slurry in the absorption tower 1 by using the measuring device comprises the following steps: firstly, opening a slurry switch valve 6 on a detection pipe 4 and an electric switch valve 10 on a connecting pipe 9, enabling the slurry to enter a first storage tank 2 through a self-flowing pipe, then enabling the slurry to automatically flow to a second storage tank 3 through the connecting pipe 9, closing the electric switch valve 10 when the slurry reaches the position of an upper liquid level detection sensor 13, pressurizing the second storage tank 3 by a pressurizing pump 11, and enabling the slurry in the second storage tank 3 to flow back to an absorption tower 1 under the action of pressure; when the slurry reaches the position below the lower liquid level detection sensor 14, the electric pressure reducing valve 12 is opened to relieve the pressure of the second storage tank 3, after the pressure relief is completed, the electric switch valve 10 is opened, and the slurry enters the second storage tank 3 again from the first storage tank 2.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (7)

1.吸收塔浆液PH和密度的测量装置，其特征在于，包括与吸收塔底部连接的自流管、与自流管连接第一储存罐以及与第一储存罐连接的第二储存罐；所述自流管包括检测管以及与检测管连接的倒U型管，所述检测管上端与吸收塔底部出液口连接，所述检测管下端与倒U型管的进口连接，倒U型管的下端出口与第一储存罐顶部的进液口连接；在检测管上顺序安装浆液开关阀、PH检测仪和密度检测仪；所述第一储存罐的底部通过连接管与第二储存罐顶部连接，在连接管上安装电动开关阀；第二储存罐的底部出液口通过回流管与吸收塔顶部进液口连接；在第二储存罐的顶部安装加压管和泄压管，在加压管上安装加压泵，在泄压管上安装电动减压阀，在第二储存罐的中上部安装上液位检测传感器，在第二储存罐的底部安装下液位检测传感器，在第二储存罐上安装压力表。1. the measuring device of absorption tower slurry PH and density, is characterized in that, comprises the self-flow pipe that is connected with the bottom of the absorption tower, connects the first storage tank with the self-flow pipe and the second storage tank that is connected with the first storage tank; Described self-flowing The tube includes a detection tube and an inverted U-shaped tube connected with the detection tube, the upper end of the detection tube is connected with the liquid outlet at the bottom of the absorption tower, the lower end of the detection tube is connected with the inlet of the inverted U-shaped tube, and the lower end of the inverted U-shaped tube is outlet. Connect with the liquid inlet at the top of the first storage tank; install the slurry switch valve, pH detector and density detector in sequence on the detection pipe; the bottom of the first storage tank is connected to the top of the second storage tank through the connecting pipe, and the An electric switch valve is installed on the connecting pipe; the liquid outlet at the bottom of the second storage tank is connected to the liquid inlet at the top of the absorption tower through a return pipe; a pressure pipe and a pressure relief pipe are installed on the top of the second storage tank, and the pressure pipe is installed on the top of the second storage tank. Install the booster pump, install the electric pressure reducing valve on the pressure relief pipe, install the liquid level detection sensor on the middle and upper part of the second storage tank, install the lower liquid level detection sensor on the bottom of the second storage tank, and install the liquid level detection sensor on the bottom of the second storage tank. Install pressure gauge on. 2.根据权利要求1所述吸收塔浆液PH和密度的测量装置，其特征在于：倒U型管的最高位置高于PH检测仪的安装位置。2. The measuring device of absorption tower slurry pH and density according to claim 1, is characterized in that: the highest position of the inverted U-shaped pipe is higher than the installation position of the pH detector. 3.根据权利要求1所述吸收塔浆液PH和密度的测量装置，其特征在于：第一储存罐与吸收塔底部出液口的高度差为3-4m。3. The measuring device of absorption tower slurry pH and density according to claim 1, is characterized in that: the height difference between the first storage tank and the liquid outlet at the bottom of the absorption tower is 3-4m. 4.根据权利要求1所述吸收塔浆液PH和密度的测量装置，其特征在于：所述连接管为多个，每个连接管上均安装有电动开关阀。4 . The measuring device for the pH and density of the slurry in the absorption tower according to claim 1 , wherein the connecting pipes are multiple, and each connecting pipe is provided with an electric on-off valve. 5 . 5.根据权利要求1所述吸收塔浆液PH和密度的测量装置，其特征在于：所述第二储存罐的位置低于第一储存罐。5 . The measuring device for the pH and density of the slurry in the absorption tower according to claim 1 , wherein the position of the second storage tank is lower than that of the first storage tank. 6 . 6.根据权利要求1所述吸收塔浆液PH和密度的测量装置，其特征在于：所述上液位检测传感器、下液位检测传感器、压力表与控制器的输入端连接，加压泵、电动减压阀和电动开关阀分别与控制器的输出端电路连接。6. according to the measuring device of the described absorption tower slurry PH and density of claim 1, it is characterized in that: described upper liquid level detection sensor, lower liquid level detection sensor, pressure gauge are connected with the input end of controller, pressurizing pump, The electric pressure reducing valve and the electric switch valve are respectively connected with the output end circuit of the controller. 7.权利要求1-6任一项所述测量装置测量吸收塔浆液PH和密度的方法，其特征在于，包括以下步骤：首先打开检测管上的浆液开关阀和连接管上的电动开关阀，浆液经自流管进入第一储存罐，然后经连接管自流至第二储存罐，当浆液到达上液位检测传感器位置时，电动开关阀关闭，加压泵对第二储存罐加压，在压力的作用下，第二储存罐内的浆液回流至吸收塔；当浆液到达下液位检测传感器以下时，打开电动减压阀对第二储存罐泄压，泄压完成后，打开电动开关阀，浆液由第一储存罐再次进入第二储存罐。7. the measuring device described in any one of claim 1-6 measures the method for absorption tower slurry PH and density, it is characterized in that, comprise the following steps: first open the electric on-off valve on the slurry on-off valve on the detection pipe and the connecting pipe, The slurry enters the first storage tank through the artesian pipe, and then flows to the second storage tank through the connecting pipe. When the slurry reaches the position of the upper liquid level detection sensor, the electric switch valve is closed, and the pressure pump pressurizes the second storage tank. Under the action of the second storage tank, the slurry in the second storage tank is returned to the absorption tower; when the slurry reaches below the lower liquid level detection sensor, open the electric pressure reducing valve to relieve the pressure of the second storage tank. After the pressure relief is completed, open the electric switch valve, The slurry enters the second storage tank again from the first storage tank.
CN202011056489.6A 2020-09-30 2020-09-30 Device and method for measuring pH and density of slurry in absorption tower Pending CN112169575A (en)

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