CN112957887A - Full-automatic ammonia adding method and system for ammonia desulphurization device - Google Patents

Full-automatic ammonia adding method and system for ammonia desulphurization device Download PDF

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CN112957887A
CN112957887A CN202110115753.7A CN202110115753A CN112957887A CN 112957887 A CN112957887 A CN 112957887A CN 202110115753 A CN202110115753 A CN 202110115753A CN 112957887 A CN112957887 A CN 112957887A
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concentration
ammonia
outlet
flue gas
automatic
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CN112957887B (en
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汤先凯
周亮
张刚
李娟�
李军东
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Sinopec Engineering Group Co Ltd
Sinopec Nanjing Engineering Co Ltd
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Sinopec Engineering Group Co Ltd
Sinopec Nanjing Engineering 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
    • B01D53/346—Controlling the process
    • 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
    • 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
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
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  • General Chemical & Material Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Treating Waste Gases (AREA)

Abstract

The invention discloses a full-automatic ammoniating method and a system for an ammonia desulphurization device, wherein the ammoniating method comprises the following steps: presetting a system deviation calibration coefficient K as actual ammonia addition/theoretical ammonia addition; automatically adjusting K according to the SO outlet2Concentration v2With the target discharge concentration VtAnd 1-10 seconds before export SO2Concentration v3Comparison, e.g. export SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3When the ammonia feeding quantity is high, K is increased according to the set step length and frequency, namely, the ammonia feeding quantity is gradually increased, and a full-automatic ammonia feeding system of the ammonia desulphurization device is provided. The invention discloses a convenient, reliable and intelligent full-automatic ammonia adding method and system, and solves the problem of the traditional desulfurization systemSerious ammonia escape caused by excessive ammonia addition, low desulfurization efficiency caused by too small ammonia addition and the like.

Description

Full-automatic ammonia adding method and system for ammonia desulphurization device
Technical Field
The invention relates to an ammonia method and a system for an ammonia desulphurization device, in particular to a full-automatic ammonia method and a system for the ammonia desulphurization device.
Background
The flue gas desulfurization is to collect SO in flue gas by using alkaline absorbent (adsorbent) in an absorption (adsorption) form2Corresponding sulfite is generated, and finally the sulfite is converted into more stable sulfate or other sulfides by measures such as natural oxidation or forced oxidation and the like so as to achieve the aim of desulfurization. The desulfurization technology is mainly divided into a wet method, a semi-dry method and a dry method, wherein the wet desulfurization process accounts for about 85 percent of the desulfurization device.
As a typical wet desulphurization process, ammonia desulphurization attracts much attention, and has the advantages of low energy consumption, high reaction rate, high desulphurization efficiency and the like. Meanwhile, the ammonia desulphurization process has rich raw material sources and various forms, and the by-product generated by ammonia desulphurization has high added value, is a nitrogen fertilizer with excellent performance, and has good application prospect. However, the ammonia desulfurization process generally has the problems of low slurry oxidation efficiency, ammonia escape, aerosol and the like, which not only can influence the normal operation of equipment, but also can cause serious pollution to the environment after the escaped ammonia and aerosol are discharged into the atmosphere along with flue gas.
The main reasons for ammonia escape are that the content of free ammonia in the desulfurization circulating liquid is higher and the pH value is higher due to the excessive use amount of ammonia water, and the temperature in the tower is higher, the equilibrium partial pressure of ammonia is higher, and the volatilization is more serious; on the other hand, the low oxidation rate of ammonium sulfite is also an important factor causing serious ammonia slip, because the ammonium sulfite generated by desulfurization is an unstable compound, and if the ammonium sulfite is not oxidized into stable ammonium sulfate in time, the ammonium sulfite is easily decomposed into gaseous SO2And ammonia, exacerbating the ammonia slip phenomenon. The generation of aerosol in the desulfurizing tower is closely related to ammonia escape because of escaped ammonia gasCan react with SO in the flue gas2、SO3Gas phase heterogeneous reaction occurs to generate aerosol which mainly comprises ammonium sulfite and ammonium sulfate. In addition, SO is absorbed2When the desulfurization liquid drops are carried by the flue gas and discharged, ammonium sulfite or ammonium sulfate crystals can be separated out due to evaporation, too high flue gas flow speed and the like, and aerosol is formed. The aerosols generated in these desulfurization towers are mainly micron-submicron particles, and are difficult to be effectively captured by the washing action of the desulfurization slurry alone. Therefore, in actual operation, the ammonia addition amount of the system is strictly controlled to prevent ammonia slip and aerosol generation caused by excessive ammonia addition.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a safe, stable, accurate and convenient full-automatic ammonia adding method for an ammonia desulphurization device, and the invention aims to provide a full-automatic ammonia adding system for the ammonia desulphurization device.
The technical scheme is as follows: the invention discloses a full-automatic ammonia adding method of an ammonia desulphurization device, which comprises the following steps:
(1) presetting a system deviation calibration coefficient K as actual ammonia addition/theoretical ammonia addition;
(2) automatically adjusting K according to the SO outlet2Concentration v2With the target discharge concentration VtAnd 1-10 seconds before export SO2Concentration v3Comparison, e.g. export SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3High (ascending trend), K increases according to the set step size and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two conditions of high (rising trend) cannot be satisfied simultaneously; e.g. outlet SO2Concentration v2Specific target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3Low (downward trend), K becomes smaller in set step size and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two conditions cannot be satisfied simultaneously;
(3) and automatically adjusting the ammonia adding amount according to the K value.
Further, the theoretical ammonia addition Q1＝q(34/64)/v4*10-6kg/h, wherein v4Is the mass concentration of ammonia water or liquid ammonia, and q is SO theoretically absorbed by a desulfurization system2The amount of (c).
Actual ammonia addition Q2＝K*q(34/64)/v4*10-6kg/h, wherein v4Is the mass concentration of ammonia water or liquid ammonia, and q is SO theoretically absorbed by a desulfurization system2The amount of (c).
Theoretical SO absorption of desulfurization system2q-V1 q1-V2 q2- (V)tQ2-v2 q2) mg/h, wherein q is1Is the amount of flue gas at the inlet of the desulfurizing tower, q2Is the amount of outlet flue gas, v1Is an inlet SO of a desulfurizing tower2And (4) concentration.
In the step (3), the ammonia adding amount is automatically adjusted by arranging an ammonia water or liquid ammonia adjusting valve on the ammonia adding pipeline according to SO2The concentration change controls the opening of the ammonia adding regulating valve.
The invention discloses a full-automatic ammonia adding system of an ammonia desulphurization device, which comprises a controller, an ammonia water or liquid ammonia regulating valve and an outlet flue gas CEMS system, wherein the controller is used for presetting a system deviation calibration coefficient K which is actual ammonia addition/theoretical ammonia addition, automatically regulating K, and automatically adding ammonia according to an outlet SO2Concentration v2With the target discharge concentration VtAnd 1-10 seconds before export SO2Concentration v3Comparison, e.g. export SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3High (ascending trend), K increases according to the set step size and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3High (rising tendency) two conditions cannot be metSimultaneously satisfies the following conditions; e.g. outlet SO2Concentration v2Lower than the target emission concentration Vt and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3Low (downward trend), K becomes smaller in set step size and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two conditions cannot be satisfied simultaneously; controlling an ammonia water or liquid ammonia regulating valve to automatically regulate the ammonia adding amount according to the K value; the outlet flue gas CEMS system is used for providing an outlet SO for the controller2Concentration v2。
Preferably, the ammonia adding system further comprises an ammonia water or liquid ammonia flow meter, and the ammonia water or liquid ammonia flow meter is used for providing the flow of the ammonia water or liquid ammonia for the controller.
The ammonia adding system also comprises an inlet flue gas CEMS system which is used for providing an inlet flue gas amount q for the controller1And inlet SO2Concentration v1。
Further, the outlet flue gas CEMS system is also used for providing an outlet flue gas amount q for the controller2。
The controller is used for controlling the inlet and outlet flue gas amount and the inlet and outlet SO according to the inlet flue gas CEMS system and the outlet flue gas CEMS system2Concentration according to the set SO2Calculating the actual SO removal according to the target emission concentration2In the amount of (A) and then removing SO according to the actual2The actual amount of ammonia added is calculated.
The invention discloses a full-automatic ammonia adding system of an ammonia desulphurization device, which comprises an ammonia water or liquid ammonia regulating valve, an ammonia water or liquid ammonia flowmeter, an oxidation tank, an inlet flue gas CEMS system and an outlet flue gas CEMS system.
Flue gas enters the desulfurizing tower from a flue inlet, and inlet flue gas flow and SO are recorded through an inlet CEMS system2Concentration, smoke temperature, pressure, O2The flue gas passes through a concentration section, an absorption section, a water washing section and a demisting section from bottom to top in sequence from the desulfurizing tower, and then enters a chimney from the top of the desulfurizing tower to be discharged into the atmosphere. Outlet flue gas streamAmount, SO2Concentration, smoke temperature, pressure, O2Concentration, humidity and other parameters are provided by an outlet CEMS of the desulfurizing tower.
The flue gas in the desulfurizing tower is in countercurrent contact with ammonia water in an absorption section, SO that most of SO in the flue gas2Is removed, and the adding amount of ammonia water is determined by the flue gas amount and SO of the system2The parameters of concentration, temperature and humidity are changed and controlled by an ammonia water full-automatic ammonia adding system.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the problems that the ammonia escape is caused by high free ammonia content, high pH value, high temperature in the tower, serious volatilization and high equilibrium partial pressure of ammonia in the desulfurization circulating liquid due to overlarge ammonia water consumption in the ammonia desulfurization process are solved;
(2) the generation of aerosol in the desulfurizing tower is closely related to the escape of ammonia, and the escaped ammonia gas can be related to SO in the flue gas2Gas-phase heterogeneous reaction is generated to generate aerosol mainly comprising ammonium sulfite and ammonium sulfate, so that the generation of the aerosol caused by ammonia escape is effectively reduced by the full-automatic ammonia adding system of the ammonia desulphurization device;
(3) the automatic adjustment of the ammonia adding amount greatly reduces the working intensity of operators;
(4) because of different factors such as coal quality, operation load, operation parameters and the like, the ammonia adding amount is different, the full-automatic ammonia adding system can effectively adjust the ammonia water adding amount according to the actual operation condition, and the ammonia escape phenomenon and the like caused by excessive ammonia adding amount are avoided;
(5) provides a safe, stable, accurate and convenient full-automatic ammonia adding method for ammonia desulphurization, SO that the SO at the outlet is ensured to be2Concentration v2Controlled at a target value VtIn the range of ± 1.
Drawings
FIG. 1 is a schematic flow diagram of a fully automatic ammoniating system of an ammonia desulfurization plant of the present invention;
FIGS. 2(a) - (b) show the outlet flue gas SO of the fully automatic ammonia-adding system of the ammonia desulfurization device of the present invention2Two curves of concentration over time.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
As shown in figure 1, the full-automatic ammonia adding system of the ammonia desulphurization device comprises an ammonia water or liquid ammonia regulating valve 1, an ammonia water or liquid ammonia flowmeter 2, an oxidation tank 3, an inlet flue gas CEMS system 4, an outlet flue gas CEMS system 5 and a desulphurization tower 6.
Flue gas enters the desulfurizing tower 6 from a flue inlet, and inlet flue gas flow, SO, is recorded through the inlet CEMS system 42Concentration, smoke temperature, pressure, O2The flue gas passes through a concentration section, an absorption section, a water washing section and a demisting section from bottom to top in sequence from the desulfurizing tower, and then enters a chimney from the top of the desulfurizing tower to be discharged into the atmosphere. Outlet flue gas flow, SO2Concentration, smoke temperature, pressure, O2Concentration, humidity, etc. are provided from the outlet of the desulfurization tower, CEMS 5.
Ammonia water or liquid ammonia enters the bottom of the oxidation tank from the ammonia water tank through an ammonia conveying pipeline, and the ammonia adding amount is controlled by an ammonia water or liquid ammonia adjusting valve and a flowmeter.
The method for realizing full-automatic ammonia addition of the ammonia desulphurization device by using the device comprises the following steps:
setting ammonia water or liquid ammonia regulating valve on the ammonia adding pipeline according to SO2The concentration change controls the opening of the ammonia adding regulating valve.
According to the quantity of flue gas at the inlet and outlet of the ammonia process desulfurization provided by CMES, SO at the inlet and outlet2Concentration and set SO2Calculating the target emission concentration, and theoretically removing SO2Amount of (A) according to theory to remove SO2The theoretical ammonia consumption is automatically calculated by the quantity system, and the actual ammonia consumption is automatically calculated according to the theoretical ammonia consumption multiplied by K.
K is preset: k is the actual ammonia addition (indicated by ammonia water or liquid ammonia flow meter)/theoretical ammonia addition.
According to the outlet SO2Concentration v2With the target discharge concentration VtAnd 1-10 seconds before export SO2Concentration v3Comparison, e.g. export SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3High (ascending trend), K increases according to the set step size and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two conditions of high (rising trend) cannot be satisfied simultaneously; e.g. outlet SO2Concentration v2At the target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3Low (downward trend), K becomes smaller in set step size and frequency until the outlet SO2Concentration v2At the target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two lower conditions cannot be satisfied simultaneously.
In the stage of ammonia addition, the amount of ammonia is dependent on the SO in the flue gas2Concentration v2Continuously adjust SO that the outlet flue gas SO2Concentration at set target discharge concentration VtThe concentration of the ammonia at the outlet is finally realized along with the fine adjustment of the ammonia adding amount by the up-and-down fluctuation of the vicinity2And a set target emission concentration VtAre equal.
The desulfurization absorption tower of the pulverized coal boiler of 2 multiplied by 240t/h is reformed, and the flue gas volume is 2 multiplied by 280000Nm under rated working condition3H, one furnace and one tower, the inlet flue gas temperature is 130 ℃, and the inlet flue gas SO2Concentration 2000mg/Nm3Inlet flue gas particulate matter content 20mg/Nm3The outlet flue gas amount is 2 multiplied by 287000Nm3H, outlet flue gas SO2Concentration 28mg/Nm312% ammonia water is used as the absorbent.
The parameter control and process are described as follows: flue gas enters the desulfurizing tower from a flue inlet, and inlet flue gas flow and SO are recorded through an inlet CEMS system2Concentration, smoke temperature, pressure, O2The flue gas passes through a concentration section, an absorption section, a water washing section and a demisting section from bottom to top in sequence from the desulfurizing tower, and then enters a chimney from the top of the desulfurizing tower to be discharged into the atmosphere. Outlet flue gas flow, SO2Concentration, smoke temperature, pressureForce, O2Concentration, humidity and other parameters are provided by an outlet CEMS of the desulfurizing tower.
The flue gas in the desulfurizing tower is in countercurrent contact with ammonia water in an absorption section, SO that most of SO in the flue gas2Is removed, and the adding amount of ammonia water is determined by the flue gas amount and SO of the system2The parameters of concentration, temperature and humidity are changed and controlled by a full-automatic ammonia adding system.
Setting an SO according to emission requirements and operation conditions2Target emission concentration VtIs 25mg/m3Definition of SO 3s before the exit of the flue gas2The concentration was v 3.
Presetting a system deviation calibration coefficient K:
theoretical SO absorption of desulfurization system2Amount q ═ v1*q1-v2*q2-(VT*q2-v2*q2)mg/h＝{280000*2000-287000*28-(287000*25-287000*28)}*10-6552.8kg/h, wherein v1Is an inlet SO of a desulfurizing tower2Concentration q1Is the amount of flue gas at the inlet of the desulfurizing tower, v2Is SO at the outlet of a desulfurizing tower2Concentration q2Is the flue gas quantity at the outlet of the desulfurizing tower.
Theoretical ammonia addition Q ═ Q (34/64)/v4 kg/h ═ 2447.29kg/h in ammonia desulfurization systems, where v is4Is the mass concentration of ammonia water, w%.
At the moment, the ammonia water flowmeter displays that the flow rate is 2398.56kg/h, K is 2398.56/2447.29 is 0.980, and the preset value of the system deviation calibration coefficient K is 0.980.
SO2The trend of the concentration with time follows the curve of fig. 2(a) or fig. 2 (b).
According to the outlet SO2Concentration v2With the target discharge concentration VtComparison and export of SO2Concentration v2And 1-10 seconds before the outlet SO2At a concentration v3To obtain an outlet SO2Concentration v2Above or below the target value, whether it is an ascending trend or a descending trend, and then determining the change in K, e.g. outlet SO2Concentration v2At a target value VtUpward and ascending trend, K is changed according to the set step length and frequencyLarge until the above conditions cannot be simultaneously satisfied; e.g. outlet SO2Concentration v2At a target value VtBelow and in a downward trend, K becomes smaller in set steps and frequency until the above conditions cannot be met at the same time.
By tracing the outlet SO2Concentration v2Continuously and automatically adjusting the system deviation calibration coefficient K and finally discharging SO2Concentration v2Can reach the target value of 25mg/m3Nearby, when ammonia escapes 1.1mg/Nm3(hour average value), the ammonia utilization rate reaches more than 99.8 percent, and the concentration of fine dust is 2.1mg/m3. Compared with the prior art, the ammonia escape phenomenon is obviously improved before ammonia self-regulation, and the aerosol concentration is also reduced.

Claims (10)

1. A full-automatic ammoniating method for an ammonia desulphurization device is characterized by comprising the following steps:
(1) presetting a system deviation calibration coefficient K as actual ammonia addition/theoretical ammonia addition;
(2) automatically adjusting K according to the SO outlet2Concentration v2With the target discharge concentration VtAnd 1-10 seconds before export SO2Concentration v3Comparison, e.g. export SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3High, K is increased according to the set step length and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two high conditions cannot be satisfied simultaneously; e.g. outlet SO2Concentration v2Specific target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3Low, K becomes smaller in a set step size and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two conditions cannot be satisfied simultaneously;
(3) and automatically adjusting the ammonia adding amount according to the K value.
2. The full-automatic ammonia adding method of the ammonia desulphurization device according to claim 1, characterized in that: the theoretical ammonia addition Q1＝q(34/64)/v4*10-6kg/h, wherein v4Is the mass concentration of ammonia water or liquid ammonia, and q is SO theoretically absorbed by a desulfurization system2The amount of (c).
3. The full-automatic ammonia adding method of the ammonia desulphurization device according to claim 1, characterized in that: the actual ammonia addition Q2＝K*q(34/64)/v4*10-6kg/h, wherein v4Is the mass concentration of ammonia water or liquid ammonia, and q is SO theoretically absorbed by a desulfurization system2The amount of (c).
4. The full-automatic ammonia adding method of the ammonia desulfurization device according to claim 2 or 3, characterized in that: the desulfurization system theoretically absorbs SO2Amount q ═ v1*q1-v2*q2-(Vt*q2-v2*q2) mg/h, wherein q is1Is the amount of flue gas at the inlet of the desulfurizing tower, q2Is the amount of outlet flue gas, v1Is an inlet SO of a desulfurizing tower2And (4) concentration.
5. The full-automatic ammonia adding method of the ammonia desulphurization device according to claim 1, characterized in that: in the step (3), the automatic ammonia adding amount adjustment is carried out by arranging an ammonia water or liquid ammonia adjusting valve on the ammonia adding pipeline according to SO2The concentration change controls the opening of the ammonia adding regulating valve.
6. The utility model provides a full-automatic ammoniation system of ammonia process desulphurization unit which characterized in that: the device comprises a controller, an ammonia water or liquid ammonia regulating valve (1) and an outlet flue gas CEMS system (5), wherein the controller is used for presetting a system deviation calibration coefficient K which is actual ammonia addition/theoretical ammonia addition, automatically regulating K, and regulating K according to an outlet SO2Concentration v2With the target discharge concentration VtAnd 1-10 seconds before export SO2Concentration v3Comparison, e.g. export SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3High, K is increased according to the set step length and frequency until the outlet SO2Concentration v2Specific target discharge concentration VtHigh and outlet SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two high conditions cannot be satisfied simultaneously; e.g. outlet SO2Concentration v2At the target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3Low, K becomes smaller in a set step size and frequency until the outlet SO2Concentration v2At the target discharge concentration VtLow sum of SO2Concentration v2Outlet SO 1-10 seconds before2Concentration v3The two conditions cannot be satisfied simultaneously; the ammonia water or liquid ammonia control regulating valve (1) is used for automatically regulating the ammonia adding amount according to the K value; the outlet flue gas CEMS system (5) is used for providing an outlet SO for the controller2Concentration v2。
7. The full-automatic ammoniating system of an ammonia desulphurization device according to claim 6, characterized in that: the ammonia adding system further comprises an ammonia water or liquid ammonia flow meter (2), and the ammonia water or liquid ammonia flow meter (2) is used for providing the flow of the ammonia water or liquid ammonia for the controller.
8. The full-automatic ammoniating system of an ammonia desulphurization device according to claim 6, characterized in that: the ammonia adding system also comprises an inlet flue gas CEMS system (4), wherein the inlet flue gas CEMS system (4) is used for providing an inlet flue gas amount q for the controller1And inlet SO2Concentration v1。
9. The full-automatic ammoniating system of an ammonia desulphurization device according to claim 6, characterized in that: the outlet flue gas CEMS system (5) is also used for providing an outlet flue gas amount q for the controller2。
10. The full-automatic ammoniating system of an ammonia desulphurization device according to claim 6, characterized in that: the controller is used for controlling the inlet and outlet flue gas amount and the inlet and outlet SO according to the inlet flue gas CEMS system (4) and the outlet flue gas CEMS system (5)2Concentration according to the set SO2Calculating the actual SO removal according to the target emission concentration2In the amount of (A) and then removing SO according to the actual2The actual amount of ammonia added is calculated.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN115318062A (en) * 2022-09-20 2022-11-11 深圳市通久电子有限公司 Automatic calibration method for oxygen generator

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