CN111330316A - Thermal power plant limestone-wet flue gas desulfurization defoaming method based on desulfurization defoaming agent - Google Patents
Thermal power plant limestone-wet flue gas desulfurization defoaming method based on desulfurization defoaming agent Download PDFInfo
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- CN111330316A CN111330316A CN202010196424.5A CN202010196424A CN111330316A CN 111330316 A CN111330316 A CN 111330316A CN 202010196424 A CN202010196424 A CN 202010196424A CN 111330316 A CN111330316 A CN 111330316A
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- 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
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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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/602—Oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention belongs to the technical field of flue gas desulfurization, and discloses a thermal power plant limestone-wet flue gas desulfurization defoaming method based on a desulfurization defoaming agent, wherein under the working condition of relatively stable operation load, related operation parameters of FGD (flue gas desulfurization) are recorded, and after 4 hours, the addition work of a special defoaming agent for experimental desulfurization is started; keeping the number of the slurry circulating pumps in operation under the conditions that the desulfurization rate is qualified and the pH value is 5.0-5.6; according to the inlet flue gas quantity, the flue gas dust content, the boiler oil feeding quantity and the inlet SO of the desulfurization system2Determining the input amount of the defoaming agent according to the operating conditions such as concentration and the like; adding 0.5 kg-3 kg of special defoaming agent for desulfurization into the pit, stirring for 5 min-10 min, and pumping into an absorption tower through a pit pump of the absorption tower. The invention is mainly applied to thermal power plants, municipal coal-fired heat supply units, steel plants and coking plantsAnd defoaming the limestone slurry in the limestone-wet flue gas desulfurization absorption tower.
Description
Technical Field
The invention belongs to the technical field of limestone-wet flue gas desulfurization of a coal-fired power plant by using a YC-503 special defoaming agent, and particularly relates to a thermal power plant limestone-wet flue gas desulfurization defoaming method based on a desulfurization defoaming agent, in particular to a thermal power plant (municipal heat supply unit, steel plant and coke plant) limestone-wet flue gas desulfurization absorption tower limestone slurry defoaming method based on a desulfurization special defoaming agent.
Background
At present, the limestone-wet flue gas desulfurization technology of the existing coal-fired power plants (municipal heat supply units, steel plants and coke plants) is as follows: because the fire coal contains SiO2Particles and coal dust are not fully combusted, and oily substances enter an absorption towerAnd oil is fed in the combustion process, the flue gas generated after combustion carries dust and oily substances, and the flow of the flue gas is large, SO that a large amount of foam is generated when the flue gas and limestone slurry are washed, and the foam wraps and carries insufficiently reacted SO2Gas, SiO2Particles, undissolved limestone particles, gypsum crystals and the like, while a portion of SO is unavoidable2The limestone solution does not react and directly escapes along with the flue gas, SO that the desulfurization efficiency is reduced and even SO is generated2The emission exceeds the standard. At the same time, fine SiO2Particles, undissolved limestone particles, impurities such as gypsum crystals are wrapped up by bubbles and meet GGH and defroster along with the rising of flue gas, cause a large amount of mixed solid particles to attach to GGH and defroster, can cause GGH and defroster scale deposit serious after a period of time, this dirt body is very firm, and very difficult to clear away, because GGH and defroster flue gas grid channel design clearance are narrower, the dirt body can make GGH and defroster flue gas through-flow area reduce rapidly, windage and pressure differential increase rapidly, can cause GGH and defroster to block up completely when serious, thereby force generating set must the load reduction, cause desulfurization system tripping operation even, generating set is forced to stop the fortune. Therefore, the problem of limestone slurry foaming in the limestone-wet flue gas desulfurization process of the thermal power plant becomes urgent.
In summary, the problems of the prior art are as follows:
(1) SO2 does not react with limestone and directly escapes along with flue gas, SO that the desulfurization efficiency is reduced and even the emission of SO2 exceeds the standard.
(2) The scaling of the GGH and the demister is serious, the smoke flow area is reduced, the wind resistance and the pressure difference are increased, the blockage of the GGH and the demister and the potential safety hazard of equipment can be caused when the scaling is serious, the load of a generator set is forced to be reduced, and even the tripping of a desulfurization system and the forced shutdown of the generator set are caused.
The difficulty in solving the technical problems is as follows: (1) the existing flue gas desulfurization systems of domestic thermal power plants (thermal power units, steel plants and coke plants) all adopt a limestone-wet desulfurization production process, and the biggest defect of the production process is that the problem of limestone slurry foaming cannot be solved.
(2) The potential safety hazard and the environmental-friendly discharge standard exceeding caused by limestone slurry foaming can not be solved at present.
(3) Due to high flue gas temperature, large flue gas amount, complex foaming reason, irregular foaming, large foaming amount, high foaming speed and serious harm, the prior art cannot dynamically analyze and detect the foaming process of limestone slurry in the absorption tower, the problems cannot be solved by the domestic desulfurization system at present, and no corresponding technology can solve the problems.
The significance of solving the technical problems is as follows: (1) the problem of slurry foaming in the limestone-wet flue gas desulfurization production process is solved, and the problems that the flue gas wrapped in bubbles and containing SO2 is directly discharged into the atmosphere without being subjected to desulfurization treatment, SO that the emission of SO2 is increased, the pollution is increased, and even the environmental protection exceeds the standard are prevented.
(2) The problems of scaling and blockage of a GGH and a demister and increase of smoke air resistance are solved, the phenomenon that a generator set must reduce load due to overlarge air resistance is avoided, and the phenomena of tripping of a desulfurization system and shutdown of the generator set (a heat supply unit, a steel mill and a coking plant) are avoided.
(3) The maintenance cost caused by shutdown descaling due to GGH and demister scaling blockage is reduced, and the utilization hours and the production income of the generator set (a heat supply unit, a steel plant and a coking plant) are improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a thermal power plant limestone-wet flue gas desulfurization defoaming method based on a special defoaming agent for desulfurization.
The invention is realized in this way, a method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower of a desulfurization defoaming agent comprises the following steps:
step one, after recording related operation parameters of FGD, adding a desulfurization defoamer;
step two, maintaining the number of the slurry circulating pumps in normal operation;
thirdly, according to the operation condition, the smoke gas amount and the dust content of the system, the oil feeding amount of the combustion system and the inlet SO2Determining the input amount of the desulfurization defoaming agent according to the concentration;
adding a certain amount of special defoaming agent for desulfurization into the pit of the absorption tower, stirring for 5-10 minutes, and pumping into the absorption tower through a pit pump of the absorption tower;
step five, the absorption tower keeps normal pulp supply, and the pH value is 5.0-5.6;
analyzing the change of each parameter;
seventhly, adding the desulfurization defoaming agent again;
step eight, adding the mixture periodically every 8 hours later, and increasing the use amount during dehydration (if the limestone slurry in the absorption tower has good defoaming effect and low false liquid level after the defoaming agent is added for the first time in the step seven, the step can be omitted);
and step nine, sorting and analyzing all recording parameters when the desulfurization is finished.
Further, the liquid level of the absorption tower is reduced to below 2 meters of an overflow port 2 hours before the first step.
Further, in the first step, the dosing time is 4 hours every time, and the dosing amount of 8 hours is added separately.
Further, in the third step, the addition amount of the first desulfurization defoaming agent is determined to be 0.5/1000-3/1000 of the ratio of the defoaming agent to the slurry in the absorption tower (0.5-3 kg of the defoaming agent is added to each thousand cubic limestone slurry).
Further, step five, the pH value is kept between 5.0 and 5.6.
The invention also aims to provide an application of the thermal power plant limestone-wet flue gas desulfurization absorption tower limestone slurry defoaming method based on the desulfurization defoaming agent in thermal power unit slurry defoaming.
The invention also aims to provide an application of the thermal power plant limestone-wet flue gas desulfurization absorption tower limestone slurry defoaming method based on the desulfurization defoaming agent in defoaming of slurry in a steel plant or a coke plant.
In summary, the advantages and positive effects of the invention are: the invention relates to a technical scheme for solving the problems that the bubbling of limestone slurry causes the pollution and scaling of GGH and a demister, the GGH and the demister can not work normally, the wind resistance of a flue is increased to cause the shutdown of a desulfurization system and a generator set and the reduction of desulfurization efficiency in a limestone-wet flue gas desulfurization production process of a thermal power plant (a municipal coal-fired thermal power unit, a steel plant and a coking plant). The invention relates to defoaming of limestone-wet flue gas desulfurization production process, which is mainly applied to defoaming of limestone slurry in limestone-wet flue gas desulfurization of thermal power plants, municipal coal-fired thermal power units, steel plants and coking plants.
If 1-5kg of special defoaming agent for desulfurization is added into limestone slurry in an absorption tower every day in the operation process of limestone-wet flue gas desulfurization production in a thermal power plant (a municipal coal-fired heat supply unit, a steel plant and a coke-oven plant), the problem of limestone slurry foaming can be thoroughly solved. Meanwhile, the problems that the GGH and the demister are polluted and scaled due to foaming, the GGH and the demister can not work normally, the desulfurization system and the generator set are stopped due to increase of air resistance of a flue, and the desulfurization efficiency is reduced are solved.
Drawings
FIG. 1 is a flow chart of a method for defoaming limestone slurry in a limestone-wet flue gas desulfurization absorption tower of a thermal power plant based on a desulfurization defoaming agent, which is provided by the embodiment of the invention.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
Aiming at the problems in the prior art, the invention provides a limestone-wet flue gas desulfurization and defoaming method for thermal power plants (municipal coal-fired heat supply units, steel plants and coke plants) based on a special defoaming agent for desulfurization, and the invention is described in detail below with reference to the attached drawings.
As shown in fig. 1, the method for defoaming limestone slurry in a limestone-wet flue gas desulfurization absorption tower of a thermal power plant based on a desulfurization defoaming agent provided by the embodiment of the invention comprises the following steps:
and S101, recording related FGD (flue gas desulfurization) operation parameters under the working condition that the operation load is relatively stable, and starting the addition work of the special defoaming agent for the experiment desulfurization after 4 hours.
And S102, keeping the number of the slurry circulating pumps in operation under the condition that the desulfurization rate is qualified.
S103, determining the input amount of the defoaming agent according to the system flue gas amount and the inlet SO according to the operation condition2And (4) concentration.
S104, adding 0.5-3 kg of special defoaming agent for desulfurization into the pit, stirring for 5-10 min, and pumping into the absorption tower through a pit pump of the absorption tower.
S105, the absorption tower keeps normal pulp supply, and the pH value is controlled to be 5.0-5.6.
And S106, observing the change of each parameter.
S107, adding 0.5 kg of special defoaming agent for desulfurization again after 2 hours (if limestone slurry does not foam again after 2 hours, the addition of the chemical can be omitted).
And S108, adding 0.5 kg of the water into the water periodically every 8 hours, and if the use amount is increased properly during the dehydration.
And S109, sorting and analyzing the recording parameters when the experiment is finished.
2 hours before the step S101, the liquid level of the absorption tower needs to be reduced to below 2 meters of an overflow port so as to receive the medicine slurry in the pit.
In step S101, the dosing time may be 4 hours, and the dosing amount for 8 hours may be divided.
In step S103, the addition amount of the first desulfurization antifoaming agent is determined such that the concentration of the antifoaming agent contained in the slurry in the absorption tower is 50-300 ppm.
In step S106, in the parameter observation, if the pH value in the absorption tower is stable, the false liquid level decreases, and the foam gradually disappears, it is indicated that the defoaming agent has already acted.
In the invention, the limestone powder has the granularity of less than or equal to 250 meshes and the purity of more than or equal to 90 percent.
The pH is maintained between 5.0 and 5.6 in step S106.
The invention is further described in the following examples, which are provided as evidence of the testing procedure of the defoaming agent used exclusively for desulfurization in a certain thermal power plant.
1. Purpose of experiment
Aims to solve the problems of oxygen deficiency, difficult paste removal, high limestone powder consumption and poor gypsum quality of an absorption tower of a desulfurization system of a certain thermal power plantLimestone slurry is foamed, desulfurization outlet flue gas SO2 is high, standard exceeding emission is eliminated when inlet flue gas SO2 is high, a desulfurization defoamer test is carried out on desulfurization systems No. 1 and No. 2 of a certain thermal power plant through friendly negotiation with a certain science and technology company Limited, and the test is carried out on the flue gas SO at different desulfurization inlets2The desulfurization defoaming agent can improve the foaming of limestone slurry, the desulfurization efficiency, the energy conservation and the quality of absorption tower slurry.
2. Experimental basis and standards
Desulfurization and defoaming agents from a technology company, Inc.
Desulfurization operation rules of a certain thermal power plant.
3. Field experiment group
Group leader: wangzhi.
Group members: suo Chuo and Zheng of a science and technology company, and desulfurization personnel on duty of a thermal power plant.
And (4) supervision group: a certain power generation company and a certain reclaimed water company.
4. Participating in an experimental unit:
a certain power generation company, a certain reclaimed water company, a certain thermal power plant, a certain technology limited company.
The invention is further described below in connection with a thermal power plant desulfurization system.
A desulfurization system of a certain thermal power plant adopts a limestone-gypsum wet desulfurization process, full flue gas desulfurization is realized, the unit capacity is 300 megawatts, the limestone slurry foaming problem of the desulfurization system is serious, the problem cannot be solved for a long time, and GGH and demister blockage and generator set shutdown maintenance are caused for many times.
The invention is further described below in connection with experimental conditions.
1. The granularity of the limestone powder is less than or equal to 250 meshes, and the purity is more than or equal to 90%.
2. During the experiment, the electric dust collector is normally put into operation in the optimal state to reach the design standard.
3. And the desulfurization public system operates normally.
4. Limestone slurry density load design requirements.
5. The operation of the main equipment of the desulfurization system is stable.
6. The FGD main parameters before the experiment are stable, and the PH value is kept between 5.0 and 5.6.
7. All parameters on the desulfurization DCS system are displayed normally.
8. And after the desulfurization system is adjusted to be normal according to the regulation of the system, recording a real liquid level value, a false liquid level value, a pH value, the concentration of SO2 at an inlet and an outlet, the current of a slurry circulating pump and the desulfurization efficiency.
The invention is further described below in connection with the experimental procedures.
1. Recording related FGD operation parameters under the working condition of relatively stable operation load so as to analyze the experimental result, and starting the addition work of the desulfurization defoaming agent after 4 hours.
2. And keeping the number of the slurry circulating pumps in operation under the condition that the desulfurization rate is qualified.
3. The input amount of the defoaming agent is determined according to the coal dust content, the combustion oil feeding amount, the unit load, the system flue gas amount, the dust removal effect, the foam amount, the organic matter content in the inlet raw smoke and the operation condition of the spraying system, and the addition amount of the first desulfurization defoaming agent is determined to be 50-300ppm of the defoaming agent contained in the slurry in the absorption tower.
4. Adding 0.5 kg of defoaming agent into the pit, stirring for 5-10 min, and pumping into the absorption tower by a pit pump of the absorption tower.
5. The absorption tower maintains normal pulp supply, and the pH value is controlled between 5.0 and 5.6.
6. The change of each parameter, such as stable pH value, reduction of false liquid level and gradual disappearance of foam, is observed, which indicates that the antifoaming agent has already acted.
After 7.2 hours, 0.5 kg of antifoam was again added.
8. Then, 0.5 kg of the water is added periodically every 8 hours, and if the amount is increased properly during dehydration.
9. And (5) sorting and analyzing the recorded parameters at the end of the experiment.
The invention is further described below in connection with the analysis of the experimental procedure.
1. The medicine should be slowly added when adding the medicine into the pit of the absorption tower, so as to ensure that the medicine is fully and uniformly stirred. The pit pump is preferably driven to the lowest position every time when running, so that the liquid medicine is ensured to completely enter the absorption tower.
2. The liquid level of the absorption tower is reduced to below 2 m of an overflow port in 2 hours before the experiment so as to receive the medicine slurry in the pit.
3. The meter is read every half hour during the experiment.
4. According to the actual running condition of the dam bridge power plant at that time, the dosing time is 0.5 kg per 8 hours, and the dosing is not carried out after two hours.
5. During the experiment, the pH value is adjusted by controlling the slurry supply amount of the absorption tower so as to ensure that the pH value of the limestone slurry is kept between 5.0 and 5.6.
The invention is further described below with reference to the experimental conclusions.
1. The test achieves the expected effect.
2. Under the condition that the concentration of the flue gas SO2 at the inlet of the absorption tower meets the design value of a desulfurization system, 0.5 kg of the special desulfurization defoamer is added, the slurry supply amount is normal, the pH is stable, the desulfurization efficiency is stable, the gypsum dehydration condition is good, the false liquid level (foam) is changed from nearly three meters to the false liquid level and basically disappears (foam is eliminated), and the experimental effect is good.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A thermal power plant limestone-wet flue gas desulfurization absorption tower limestone slurry defoaming method based on a desulfurization defoaming agent is characterized by comprising the following steps of:
recording related operation parameters of FGD under the working condition of relatively stable operation load, and starting the addition work of a defoaming agent special for experimental desulfurization after 4 hours;
step two, keeping the number of the slurry circulating pumps in operation under the condition that the desulfurization rate is qualified;
step threeDetermining the input amount of the defoaming agent according to the operation condition, the system smoke gas amount and the inlet SO2Concentration;
adding 0.5 kg-3 kg of special defoaming agent for desulfurization into the pit, stirring for 5 min-10 min, and pumping into an absorption tower through a pit pump of the absorption tower;
step five, the absorption tower keeps normal pulp supply and controls the pH value;
analyzing the change of each parameter;
seventhly, adding 0.5 kg of special defoaming agent for desulfurization after 2 hours; if the limestone slurry is not foamed after 2 hours, no special defoaming agent for desulfurization is added;
step eight, periodically adding 0.5 kg every 8 hours.
2. The method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower based on a desulfurization defoaming agent as claimed in claim 1, wherein the liquid level in the absorption tower is reduced to 2 meters below an overflow port so as to receive the medicine slurry in the pit 2 hours before the step.
3. The method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower based on a desulfurization defoaming agent as claimed in claim 1, wherein in the step one, the dosing time is once every 4 hours, and the dosing amount is divided by 8 hours.
4. The method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower based on a desulfurization defoaming agent as claimed in claim 1, wherein in the third step, the addition amount of the first desulfurization defoaming agent is determined so that the concentration of the defoaming agent contained in the slurry in the absorption tower is 50ppm to 300 ppm.
5. The method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower based on a desulfurization defoaming agent as claimed in claim 1, wherein in the fifth step, the pH value is 5.0-5.6.
6. The method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower based on a desulfurization defoaming agent as claimed in claim 1, wherein in the sixth step, in the observation of the analysis parameters, the pH value in the absorption tower is stable, the false liquid level is reduced, and the foam disappears.
7. The method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower based on a desulfurization defoaming agent as claimed in claim 1, wherein if a defoaming agent is added in the seventh step, a false liquid level is low, and the eighth step is not performed.
8. The method for defoaming limestone slurry in a thermal power plant limestone-wet flue gas desulfurization absorption tower based on a desulfurization defoaming agent as claimed in claim 1, wherein after the eighth step, the following steps are carried out: and (5) sorting and analyzing each recording parameter.
9. The application of the desulfurization and defoaming agent-based limestone slurry defoaming method for the limestone-wet flue gas desulfurization absorption tower of the thermal power plant based on the desulfurization and defoaming agent in defoaming of slurry of a thermal power unit is disclosed in any one of claims 1 to 8.
10. The application of the thermal power plant limestone-wet flue gas desulfurization absorption tower limestone slurry defoaming method based on the desulfurization defoaming agent as claimed in any one of claims 1 to 8 in defoaming of slurry in a steel plant or a coke-oven plant.
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| CN112156621A (en) * | 2020-09-29 | 2021-01-01 | 浙江浙能技术研究院有限公司 | Method for preventing calcium-based wet desulphurization absorption tower from bubbling |
| CN112569772A (en) * | 2020-11-16 | 2021-03-30 | 浙江浙能技术研究院有限公司 | Control method for foaming of front-end co-processing desulfurization slurry |
| CN113877403A (en) * | 2021-11-02 | 2022-01-04 | 福建龙净环保股份有限公司 | Slurry regulating and controlling method for limestone-gypsum wet flue gas desulfurization process |
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