CN114788994A - Multifunctional FGD wet desulphurization simulated dosing device and method - Google Patents

Multifunctional FGD wet desulphurization simulated dosing device and method Download PDF

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Publication number
CN114788994A
CN114788994A CN202210463240.XA CN202210463240A CN114788994A CN 114788994 A CN114788994 A CN 114788994A CN 202210463240 A CN202210463240 A CN 202210463240A CN 114788994 A CN114788994 A CN 114788994A
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slurry
measuring cylinder
pressure sensor
simulation
defoaming agent
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吕熙宁
王强
丁朋果
孙勇
熊远南
吕小林
刘杨惠珍
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Zhongnan Electric Power Test and Research Institute of China Datang Group Science and Technology Research Institute Co Ltd
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Zhongnan Electric Power Test and Research Institute of China Datang Group Science and Technology Research Institute 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
    • B01D53/46—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
    • B01D19/00—Degasification of liquids
    • B01D19/02—Foam dispersion or prevention
    • B01D19/04—Foam dispersion or prevention by addition of chemical substances
    • 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
    • B01D53/346—Controlling the process
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Toxicology (AREA)
  • Dispersion Chemistry (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a multifunctional FGD wet desulphurization simulation dosing device and a method, wherein a measuring cylinder is used as an absorption reaction vessel, limestone slurry in the measuring cylinder is maintained to be in a constant temperature state through a constant temperature water bath stirring device, and an oxidation fan, a slurry circulating pump and a standard gas cylinder are connected to the measuring cylinder to simulate the process of absorbing sulfur dioxide in flue gas by circulating flow of an absorption tower in the actual production process; this multi-functional FGD wet flue gas desulfurization simulation charge device's defoaming agent dropwise add device is used for the dropwise add defoaming agent in the automatic ration graduated flask to combine the pressure sensor of graduated flask scale 700mL department, the pressure sensor of graduated flask 900mL department, make thick liquid foaming process and dropwise add defoaming agent process integration, can directly test out the power of thick liquid foamability and defoaming agent defoaming performance ability, reduced the influence that the human interference factor caused, simulation experiment's accuracy is high.

Description

Multifunctional FGD wet desulphurization simulation dosing device and method
Technical Field
The invention relates to the field of simulation experiment devices, in particular to a multifunctional FGD wet desulphurization simulation dosing device and method.
Background
At present, thermal power generation by using coal is still the main body of power generation in China, and a large amount of SO is generated in the coal combustion process 2 、NO x And dust and other atmospheric pollutants against the generated SO 2 ，
Most of power plants in China adopt wet desulphurization. Among the wet desulfurization, the wet FGD desulfurization technique is most widely used, which utilizes limestone slurry as desulfurization adsorbent, wherein CaCO 3 With SO in flue gas 2 The reaction is carried out in the countercurrent contact in the absorption tower to generate CaSO 3 Then oxidized by oxygen blown in by a blower to finally generate CaSO 4 .2H 2 O to remove SO in the flue gas 2 The purpose of (1). Slurry foaming of an absorption tower in a wet FGD desulfurization process is a common problem, and can cause adverse effects on the operation of a power plant, such as reduction of desulfurization efficiency, corrosion of a flue structure and the like, and the non-stop of a unit can be caused in severe cases. Most of the current research on slurry foaming is on the solution of the problem after foaming, and the analysis on the slurry foaming process is lacked. The addition of the antifoaming agent is a common method for eliminating slurry foaming in a power plant, but accurate quantitative elimination is difficult to realize in the actual putting process, and whether the antifoaming agent is added continuously or not is generally determined according to the foam elimination condition by adopting a small quantity of multiple adding modes. The foaming capacity of the solution and the stability of the foam are related to the physical or chemical properties of the solute in the solution and also related to the detection and evaluation method. There are many methods for measuring foam, and there are conventional methods of air flow and pouringThe purgative method, the new method such as the conductivity method and the optical method, etc. have complex detection in the actual operation process and are limited by various factors, so a device for simulating desulfurization operation, which is reasonable and can be directly observed, is urgently needed.
In addition, the quality of gypsum byproduct in wet FGD systems becomes an important design guarantee value, and becomes one of the important parameters for the operation control of the FGD systems. The quality of the desulfurized gypsum directly affects the sale price of the gypsum and the economic benefit of the power plant. The quality of the desulfurized gypsum is ensured by taking measures from two aspects of design and operation management.
Disclosure of Invention
In order to solve the problems, the invention provides a multifunctional FGD wet desulphurization simulation dosing device and a method.
The technical scheme of the invention is as follows: a multifunctional FGD wet desulphurization simulation dosing device comprises a measuring cylinder, a standard gas cylinder, a constant temperature water bath stirring device and a defoaming agent dripping device; the measuring cylinder is placed in a constant-temperature water bath stirring device, a stirring rotor of the device is placed at the bottom of the measuring cylinder, an oxidation fan is arranged on one side of the constant-temperature water bath stirring device, a gas pipeline connected with an outlet of the oxidation fan penetrates through the side wall of the lower part of the measuring cylinder and transversely extends into the measuring cylinder, a plurality of air nozzles are formed in the side wall of the gas pipeline extending into the measuring cylinder, a slurry circulating pump is arranged on the other side of the constant-temperature water bath stirring device, a slurry pipeline A connected with an inlet of the slurry circulating pump is connected to the lower part of the measuring cylinder, a slurry pipeline B connected with an outlet of the slurry circulating pump transversely extends into the upper part of the measuring cylinder, and a plurality of slurry nozzles are formed in the side wall of the slurry pipeline B extending into the measuring cylinder;
a standard gas pipeline connected with the outlet of the standard gas bottle vertically extends into the measuring cylinder, the lower port of the standard gas pipeline is positioned in the middle of the measuring cylinder, the lower port of the standard gas pipeline is connected with a diffusion device, and the standard gas pipeline is provided with a rotor flowmeter and a partial pressure valve; one side on graduated flask upper portion is equipped with the feed liquor branch pipe, and the dropwise add export of defoaming agent dropwise add device corresponds with the last port of feed liquor branch pipe.
Preferably, defoaming agent dropwise add device include base, medicine storage tank, join in marriage the liquid pump, medicine storage tank installs in the holding tank of base upper end, medicine storage tank's upper end is equipped with joins in marriage the sap cavity, the lower extreme that should join in marriage the sap cavity is equipped with the medicine suction pipe that stretches into the medicine storage tank bottom, joins in marriage the last port that the liquid pump is connected at joining in marriage the sap cavity, the export in-connection that joins in marriage the setting of sap cavity lower part has a buret, the export of this buret is located the last port department of feed liquor branch pipe.
Preferably, the measuring cylinder is provided with measuring scales, a pressure sensor A is arranged at the 700mL scale, a pressure sensor B is arranged at the 900mL scale, and a PH meter is arranged at the bottom of the measuring cylinder.
Preferably, the dosing device is connected with a computer, a controller of the liquid distribution pump is connected with the computer through a lead, and the PH meter, the pressure sensor A and the pressure sensor B are connected with the computer through signal lines.
Preferably, the upper ends of the pressure sensor A and the pressure sensor B are respectively provided with a baffle.
A method for carrying out simulation experiment on a multifunctional FGD wet desulphurization simulation dosing device comprises the following steps:
(1) adding 500mL of limestone slurry into the measuring cylinder, opening the constant-temperature water bath stirring device, setting the water bath temperature to be 50 ℃ and the stirring speed to be 500 r/min;
(2) after the limestone slurry is heated to be in a constant temperature state, opening an oxidation fan to introduce oxygen into the limestone slurry, opening a slurry circulating pump to atomize and spray the limestone slurry from a slurry nozzle to form circulating slurry, opening a main valve and a partial pressure valve of a standard gas cylinder, adjusting the flow rate of a rotor flow meter to be 200mL/min, and adding SO with a certain concentration into the circulating slurry 2 Discharging into a measuring cylinder, and reacting to generate CaSO 4 .2H 2 The slurry started to foam during O;
(3) starting timing when the slurry foams to 700mL, stopping timing when the slurry foams to 900mL, obtaining time t1, and then closing the oxidation fan, the slurry circulating pump and the standard gas bottle;
(4) a liquid dispensing pump of the defoaming agent dripping device sucks a certain volume of defoaming agent into a liquid dispensing cavity, then the defoaming agent enters a measuring cylinder from a medicine dripping pipe to begin defoaming, an interval medicine adding mode is adopted, the interval time is 2min, the medicine adding speed is set to be 1mL/min, 2mL is added every time, the medicine adding is stopped when the foam falls from 900mL to 700mL, and the time t2 for the falling process is calculated;
(5) judging the foaming capacity of the slurry according to t1, wherein the smaller the t1 is, the stronger the foaming capacity is, and the larger the t1 is, the weaker the foaming capacity is; the defoaming performance of the defoaming agent is judged to be strong or weak according to t2, and the smaller the t2, the stronger the defoaming capability, and the larger t2, the weaker the defoaming capability.
Preferably, the time t1 in the step (3) is automatically completed by the pressure sensor A, the pressure sensor B and the computer, the slurry foams to the position of the pressure sensor A, the pressure sensor A gives a pressure signal, the computer starts to automatically time, the foam foams to the position of the pressure sensor B, the pressure sensor B gives a pressure signal, the computer stops timing, the time t1 is automatically obtained, and the time t2 in the step (4) is automatically obtained according to the same method as the step (3).
The beneficial technical effects of the invention are as follows:
(1) the multifunctional FGD wet desulphurization simulation dosing device takes the measuring cylinder as an absorption reaction vessel, limestone slurry in the measuring cylinder is maintained to be in a constant temperature state through the constant-temperature water bath stirring device, and an oxidation fan, a slurry circulating pump and a standard gas bottle are connected to the measuring cylinder to simulate the process of absorbing sulfur dioxide in flue gas by circulating flow of an absorption tower in the actual production process;
(2) the defoaming agent dripping device of the multifunctional FGD wet desulphurization simulated dosing device is used for dripping the defoaming agent into the measuring cylinder automatically and quantitatively, and is combined with the pressure sensor at 700mL of the measuring cylinder and the pressure sensor at 900mL of the measuring cylinder, so that the slurry foaming process and the defoaming agent dripping process are integrated, the strength of the slurry foaming capacity and the defoaming performance of the defoaming agent can be directly tested, the influence caused by human interference factors is reduced, and the precision of a simulation experiment is high;
(3) according to the simulation experiment method, the interval foaming time of limestone slurry in the measuring cylinder is automatically measured and calculated through the pressure sensor at 700mL of the measuring cylinder and the pressure sensor at 900mL of the measuring cylinder, so that the strength of the foaming capacity of the limestone slurry is judged, the defoaming agent is dripped into the measuring cylinder at intervals and quantitatively through the defoaming agent dripping device, the interval defoaming time of foam in the measuring cylinder is automatically measured and calculated according to the two pressure sensors, so that the strength of the defoaming capacity of the defoaming agent is judged, the air intake of an oxidation fan, the circulating speed of a slurry circulating pump and the constant-temperature stirring parameters of a constant-temperature water bath stirring device in the actual production process can be correspondingly adjusted according to the simulation experiment, the desulfurization effect and the desulfurization efficiency are improved, and the smooth operation of a power plant unit is ensured.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a partial view of fig. 1.
In the figure, 11, a measuring cylinder, 111, a liquid inlet branch pipe, 12, a standard gas bottle, 121, a standard gas pipeline, 122, a diffusion device, 123, a rotameter, 124, a pressure division valve, 13, a constant temperature water bath stirring device, 131, a stirring rotor, 14, an antifoaming agent dropping device, 141, a base, 142, a medicine storage tank, 143, a liquid dispensing pump, 144, a medicine dropping pipe, 145, a support, 146, a stop valve, 147, a liquid dispensing cavity, 148, a medicine suction pipe, 15, an oxidation fan, 151, a gas pipeline, 152, an air nozzle, 16, a slurry circulating pump, 161, a slurry pipeline A, 162, a slurry pipeline B, 163, a slurry nozzle, 17, a pressure sensor A, 18, a pressure sensor B, 19, a PH meter, 20, a computer, 201, a lead, 202, a signal line and 21, a baffle.
Detailed Description
In the first embodiment, referring to the attached figures 1-2 of the specification, a multifunctional FGD wet desulphurization simulation dosing device comprises a measuring cylinder, a standard gas cylinder, a constant temperature water bath stirring device and a defoaming agent dripping device; the measuring cylinder is placed in a constant-temperature water bath stirring device, a magnetic stirring rotor of the device is placed at the bottom of the measuring cylinder, limestone slurry in the measuring cylinder is stirred by the stirring rotor and is heated while being stirred, the temperature rise speed is higher, an oxidation fan is arranged on one side of the constant-temperature water bath stirring device, a gas pipeline connected with an outlet of the oxidation fan penetrates through the side wall of the lower part of the measuring cylinder and transversely extends into the measuring cylinder, a plurality of air nozzles are arranged on the side wall of the gas pipeline extending into the measuring cylinder and uniformly spray oxygen into the measuring cylinder through the air nozzles, a slurry circulating pump is arranged on the other side of the constant-temperature water bath stirring device, a slurry pipeline A connected with an inlet of the slurry circulating pump is connected to the lower part of the measuring cylinder, a slurry pipeline B connected with an outlet of the slurry circulating pump transversely extends into the upper part of the measuring cylinder, and a plurality of slurry nozzles are arranged on the side wall of the slurry pipeline B extending into the measuring cylinder, limestone slurry at the bottom of the measuring cylinder is conveyed to the upper end through the slurry circulating pump and is atomized and sprayed out from the slurry nozzle to form slurry circulation;
a standard gas pipeline connected with the outlet of the standard gas bottle vertically extends into the measuring cylinder, the lower port of the standard gas pipeline is positioned in the middle of the measuring cylinder, a diffusion device is connected with the lower port of the standard gas pipeline, the standard gas is uniformly diffused into the measuring cylinder through the diffusion device, a rotor flow meter and a pressure dividing valve are arranged on the standard gas pipeline, and the flow of the standard gas is adjusted through the rotor flow meter; a liquid inlet branch pipe is arranged on one side of the upper part of the measuring cylinder, a dripping outlet of the defoaming agent dripping device corresponds to an upper port of the liquid inlet branch pipe, and the liquid inlet branch pipe is used for dripping a defoaming agent from one side of the measuring cylinder, so that the interference of a slurry pipeline B and a diffusion device on the liquid inlet branch pipe is avoided;
defoaming agent dropwise add device includes the base, the medicine storage tank, join in marriage the liquid pump, the medicine storage tank is installed in the holding tank of base upper end, the upper end of medicine storage tank is equipped with joins in marriage the liquid chamber, the lower extreme that should join in marriage the liquid chamber is equipped with the inhaling pipe that stretches into the medicine storage tank bottom, join in marriage the last port that the liquid pump is connected at joining in marriage the liquid chamber, the export in-connection that joins in marriage the liquid chamber lower part and has dripped the pencil, the export of this dripped pencil is located the last port department of feed liquor branch pipe, the middle part of dripped the pencil is equipped with the support, and be equipped with the stop valve on the dripped pencil, inhale the liquid intracavity of joining in marriage the defoaming agent through joining in marriage the liquid pump, then discharge from the dripped pencil, interval through joining in marriage liquid pump is stopped and is realized the interval and is added the medicine.
Be equipped with the measurement scale on the graduated flask, be equipped with pressure sensor first in 700mL scale department, 900mL scale department is equipped with pressure sensor second, and two sensors are used for detecting the foaming liquid level of thick liquid and give the signal to be equipped with the PH meter in the bottom of graduated flask and come the pH value of real-time measurement limestone slurry.
The dosing device is connected with a computer, a controller of the liquid preparation pump is connected with the computer through a wire, and the PH meter, the pressure sensor A and the pressure sensor B are connected with the computer through signal wires; the upper ends of the pressure sensor A and the pressure sensor B are respectively provided with a baffle plate, the pressure sensors are covered by the baffle plates, and the interference of standard gas or atomized limestone slurry on the pressure sensors is avoided.
In the second embodiment, referring to fig. 1-2 of the specification, a method for performing a simulation experiment by using a multifunctional FGD wet desulphurization simulation dosing device comprises the following steps:
(1) adding 500mL of limestone slurry into the measuring cylinder, opening a constant-temperature water bath stirring device, setting the water bath temperature to be 50 ℃, and setting the stirring speed to be 500 r/min;
(2) after the limestone slurry is heated to be in a constant temperature state, opening an oxidation fan to introduce oxygen into the limestone slurry, opening a slurry circulating pump to atomize and spray the limestone slurry from a slurry nozzle to form circulating slurry, opening a main valve and a partial pressure valve of a standard gas cylinder, adjusting the flow rate of a rotor flow meter to be 200mL/min, and adding SO with certain concentration into the circulating slurry 2 Discharging into a measuring cylinder, and reacting to generate CaSO 4 .2H 2 The slurry started to foam during O;
(3) starting timing when the slurry foams to 700mL, stopping timing when the slurry foams to 900mL, obtaining time t1, and then closing the oxidation fan, the slurry circulating pump and the standard gas bottle;
(4) a liquid dispensing pump of the defoaming agent dripping device sucks a certain volume of defoaming agent into a liquid dispensing cavity, then the defoaming agent enters a measuring cylinder from a medicine dripping pipe to begin defoaming, a mode of adding medicine at intervals is adopted, the interval time is 2min, the medicine adding speed is set to be 1mL/min, 2mL is added every time, the medicine adding is stopped when the foam falls from 900mL to 700mL, and the time t2 of the falling process is calculated;
(5) judging the foaming capacity of the slurry according to t1, wherein the smaller the t1 is, the stronger the foaming capacity is, and the larger the t1 is, the weaker the foaming capacity is; the strength of the defoaming performance of the defoaming agent is judged according to t2, and the smaller the t2, the stronger the defoaming capability, and the larger the t2, the weaker the defoaming capability.
And (3) automatically completing the time t1 in the step (3) through the pressure sensor A, the pressure sensor B and the computer, foaming the slurry to 700mL (pressure sensor A), giving a pressure signal by the pressure sensor A, starting automatic timing by the computer, foaming to 900mL (pressure sensor B), giving a pressure signal by the pressure sensor B, stopping timing by the computer, automatically obtaining the time t1, automatically obtaining the time t2 in the step (4) according to the same method in the step (3), and realizing automatic control.
A plurality of standard gas cylinders can be arranged at the same time, and SO is arranged in each standard gas cylinder 2 At a concentration of 2000mg/m 3 、2500mg/m 3 、3000mg/m 3 、3500mg/m 3 The concentration gradient of the sulfur content in the furnace coal, the difference of the sulfur content in the furnace coal and the difference of the load carried by the unit, and the sulfur content in the flue gas entering the desulfurizing tower are different, so the standard gases with different concentrations are set to carry out the desulfurization simulation experiment with different concentrations.
Third embodiment, referring to fig. 1-2 of the specification, a method for performing a simulation experiment by using a multifunctional FGD wet desulfurization simulation dosing device comprises the following steps:
(1) adding 500mL of limestone slurry into the measuring cylinder, opening the constant-temperature water bath stirring device, setting the water bath temperature to be 50 ℃ and the stirring speed to be 500 r/min;
(2) after the limestone slurry is heated to be in a constant temperature state, opening an oxidation fan to introduce oxygen into the limestone slurry, and opening a slurry circulating pump to atomize and spray the limestone slurry from a slurry nozzle to form circulating slurry;
(3) a plurality of standard gas cylinders are arranged, and SO is arranged in each standard gas cylinder 2 In a concentration of 2000mg/m 3 、3000mg/m 3 、4000mg/m 3 、5000mg/m 3 Under the condition that the flow rate of the rotameter is 200mL/min, standard gas with different concentrations is sequentially introduced into the measuring cylinder, and limestone slurry is correspondingly replaced once when the standard gas cylinder is replaced once.
(4) Each SO 2 Continuously running for 1h under the concentration, recording the continuous change value of the pH value within 1h, and analyzing different SO 2 The influence on the pH value of the slurry under the concentration of the flue gas is calculated to obtain different SO 2 CaSO in slurry at run-time concentration 3 .1/2H 2 O、CaSO 4 .2H 2 And judging the quality of the gypsum according to the content of O.
Example four, see the accompanying figures 1-2 of the specification, aThe test method of the multifunctional FGD wet desulphurization simulation dosing device is basically the same as that of the embodiment, and the difference is that only one standard gas cylinder and SO are arranged 2 The concentration is 30mg/m 3 Setting the stirring speed of the constant-temperature water bath stirring device to 200r/min, 400r/min, 600r/min and 800r/min in sequence, continuously running for 1h at each stirring speed, and testing the CaSO in the gypsum slurry at each stirring speed 3 .1/2H 2 O、CaSO 4 .2H 2 And judging the influence of different stirring speeds on the gypsum slurry according to the content of O.
Fifth embodiment, referring to fig. 1-2 of the specification, a method for performing a simulation experiment by using a multifunctional FGD wet desulfurization simulation dosing device is basically the same as the embodiment except that only one standard gas bottle and SO are provided 2 The concentration is 30mg/m 3 Setting the stirring speed of the warm water bath stirring device to be 500r/min, then adjusting the rotating speed of an oxidation fan to be 100r/min, 200r/min, 300r/min, 400r/min and 500r/min in sequence, continuously operating for 1h at each rotating speed, and testing the CaSO in the gypsum slurry at each rotating speed 3 .1/2H 2 O、CaSO 4 .2H 2 And judging the influence of the oxygen inlet amount of the oxidation fan on the gypsum slurry.

Claims (7)

1. The utility model provides a multi-functional FGD wet flue gas desulfurization simulation charge device, characterized by:
comprises a measuring cylinder, a standard gas cylinder, a constant temperature water bath stirring device and a defoaming agent dripping device;
the measuring cylinder is placed in a constant-temperature water bath stirring device, a stirring rotor of the device is placed at the bottom of the measuring cylinder, an oxidation fan is arranged on one side of the constant-temperature water bath stirring device, a gas pipeline connected with an outlet of the oxidation fan penetrates through the side wall of the lower part of the measuring cylinder and transversely extends into the measuring cylinder, a plurality of air nozzles are formed in the side wall of the gas pipeline extending into the measuring cylinder, a slurry circulating pump is arranged on the other side of the constant-temperature water bath stirring device, a slurry pipeline A connected with an inlet of the slurry circulating pump is connected to the lower part of the measuring cylinder, a slurry pipeline B connected with an outlet of the slurry circulating pump transversely extends into the upper part of the measuring cylinder, and a plurality of slurry nozzles are formed in the side wall of the slurry pipeline B extending into the measuring cylinder;
a standard gas pipeline connected with the outlet of the standard gas bottle vertically extends into the measuring cylinder, the lower port of the standard gas pipeline is positioned in the middle of the measuring cylinder, the lower port of the standard gas pipeline is connected with a diffusion device, and the standard gas pipeline is provided with a rotor flowmeter and a pressure dividing valve; one side on graduated flask upper portion is equipped with the feed liquor branch pipe, and defoaming agent dropwise add device's dropwise add export corresponds with the last port of feed liquor branch pipe.
2. The multifunctional FGD wet desulphurization simulation dosing device of claim 1, which is characterized in that: defoaming agent dropwise add device include base, medicine storage tank, join in marriage the liquid pump, medicine storage tank installs in the holding tank of base upper end, medicine storage tank's upper end is equipped with joins in marriage the sap cavity, the lower extreme that should join in marriage the sap cavity is equipped with the medicine suction pipe that stretches into the medicine storage tank bottom, joins in marriage the last port that the liquid pump is connected at joining in marriage the sap cavity, the export in-connection that joins in marriage the sap cavity lower part and is connected with the buret, the export of this buret is located the last port department of feed liquor branch pipe.
3. The multifunctional FGD wet desulphurization simulation dosing device according to claim 2, wherein: the measuring cylinder is provided with measuring scales, a pressure sensor A is arranged at the 700mL scale, a pressure sensor B is arranged at the 900mL scale, and a PH meter is arranged at the bottom of the measuring cylinder.
4. The multifunctional FGD wet desulphurization simulation dosing device of claim 3, which is characterized in that: the chemical feeding device is connected with a computer, a controller of the liquid distribution pump is connected with the computer through a wire, and the PH meter, the pressure sensor A and the pressure sensor B are connected with the computer through signal wires.
5. The multifunctional FGD wet desulphurization simulation dosing device of claim 4, wherein: and the upper ends of the pressure sensor A and the pressure sensor B are respectively provided with a baffle.
6. The method for performing the simulation experiment by using the multifunctional FGD wet desulphurization simulation dosing device according to claim 5, which is characterized by comprising the following steps:
(1) adding 500mL of limestone slurry into the measuring cylinder, opening the constant-temperature water bath stirring device, setting the water bath temperature to be 50 ℃ and the stirring speed to be 500 r/min;
(2) after the limestone slurry is heated to be in a constant temperature state, opening an oxidation fan to introduce oxygen into the limestone slurry, opening a slurry circulating pump to atomize and spray the limestone slurry from a slurry nozzle to form circulating slurry, opening a main valve and a partial pressure valve of a standard gas cylinder, adjusting the flow rate of a rotor flow meter to be 200mL/min, and adding SO with certain concentration into the circulating slurry 2 Discharging into a measuring cylinder, and reacting to generate CaSO 4 .2H 2 The slurry started to foam during O;
(3) starting timing when the slurry foams to 700mL, stopping timing when the slurry foams to 900mL, obtaining time t1, and then closing the oxidation fan, the slurry circulating pump and the standard gas bottle;
(4) a liquid dispensing pump of the defoaming agent dripping device sucks a certain volume of defoaming agent into a liquid dispensing cavity, then the defoaming agent enters a measuring cylinder from a medicine dripping pipe to begin defoaming, an interval medicine adding mode is adopted, the interval time is 2min, the medicine adding speed is set to be 1mL/min, 2mL is added every time, the medicine adding is stopped when the foam falls from 900mL to 700mL, and the time t2 for the falling process is calculated;
(5) judging the foaming capacity of the slurry according to t1, wherein the smaller the t1 is, the stronger the foaming capacity is, and the larger the t1 is, the weaker the foaming capacity is; the strength of the defoaming performance of the defoaming agent is judged according to t2, and the smaller the t2, the stronger the defoaming capability, and the larger the t2, the weaker the defoaming capability.
7. The method for the multifunctional FGD wet desulphurization simulation dosing device to perform the simulation experiment according to claim 6, which is characterized in that: and (4) automatically completing the time t1 in the step (3) through the pressure sensor A, the pressure sensor B and the computer, foaming the slurry to the position of the pressure sensor A, giving a pressure signal by the pressure sensor A, starting automatic timing by the computer, giving a pressure signal by the pressure sensor B when the slurry foams to the position of the pressure sensor B, stopping timing by the computer, automatically obtaining the time t1, and automatically obtaining the time t2 in the step (4) according to the same method in the step (3).
CN202210463240.XA 2022-04-29 2022-04-29 Multifunctional FGD wet desulphurization simulated dosing device and method Pending CN114788994A (en)

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