CN110624387A - Method for preparing alkali liquor and replacing desulfurizer by using coal cinder - Google Patents
Method for preparing alkali liquor and replacing desulfurizer by using coal cinder Download PDFInfo
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- CN110624387A CN110624387A CN201910912606.5A CN201910912606A CN110624387A CN 110624387 A CN110624387 A CN 110624387A CN 201910912606 A CN201910912606 A CN 201910912606A CN 110624387 A CN110624387 A CN 110624387A
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- coal cinder
- coal
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- value
- soaking
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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
- 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
- B01D2251/604—Hydroxides
Abstract
The invention discloses a method for preparing alkali liquor by using coal cinder and replacing a desulfurizer, which relates to the technical field of coal cinder desulfurization; selecting coal cinder: selecting coal slag generated by a coal gas producer; detecting the calcium content of the coal cinder: adopting coal cinder with calcium content of more than 27%; soaking: soaking qualified coal cinder in water for about 10 minutes according to the standard that every 25 g of coal cinder is soaked in 1500 ml of water; and (3) precipitation: precipitating for 3-5 min after soaking, and extracting alkaline water; and (3) detecting the pH value: detecting the pH value of the extracted alkaline water by an instrument or test paper, wherein the qualified alkaline water to be used is detected when the pH value is about 13; adding alkaline water into the desulfurization pool to replace the reagent, and adjusting the pH value of the desulfurization pool to 8-10. The method reduces the attached solid wastes such as the new desulfurization slag generated by desulfurization, saves the mineral exploitation resources of the existing desulfurizer, reduces the desulfurization cost of enterprises, ensures that the enterprises can continuously and truly implement the environment-friendly desulfurization work, and reduces the pollution to the surrounding environment and soil caused by the landfill of the coal slag.
Description
Technical Field
The invention belongs to the technical field of coal cinder desulfurization, and particularly relates to a method for preparing alkali liquor by using coal cinder and replacing a desulfurizing agent.
Background
In the prior art, alkaline water is usually obtained for desulfurization, and sodium hydroxide, lime, sodium hydroxide and other substances containing calcium and sodium ions have high cost, namely thousands of yuan per ton; the lime belongs to mineral resources, and the calcium content of the lime is as follows: 56.5-85; the pollution of the mining and production is large, and the environment is not favorable.
The existing lime desulfurization principle is as follows: the absorption liquid is atomized and sprayed into the absorption tower through a nozzle, and is dispersed into fine liquid drops to cover the whole section of the absorption tower. The liquid drops are in countercurrent contact with flue gas in the tower, mass transfer and absorption reactions occur, and SO2, SO3, HCI and HF in the flue gas are absorbed. The oxidation and neutralization reactions of the SO2 absorption product are completed in the oxidation zone at the bottom of the absorber column and finally form gypsum. In order to maintain a constant pH of the absorption slurry and reduce lime consumption, the lime slurry is continuously fed into the circulating oxidation reaction tank while the absorbent slurry in the circulating oxidation tank is constantly agitated by the agitator and the oxidizing air to accelerate the uniform distribution and dissolution of lime in the slurry. In such a reaction process, a large amount of gas is discharged, the gas contains various harmful substances, air is polluted, and finally, the precipitated gas needs to be converted into a solid through a filter press, and the solid needs to be discarded, thereby causing a certain influence on the environment.
The chemical components of the coal cinder comprise 240-50% of SiO2, 330-35% of Al2O, 34-20% of Fe2O, more than 10% of CaO, a small amount of magnesium, sulfur, carbon and the like. The mineral composition mainly comprises anorthite, quartz, mullite, magnetite, pyrite, a large amount of silicon-containing glass (Al2O3 & 2SiO2), active SiO2, active Al2O3, a small amount of unfired coal and the like. The coal cinder is abandoned and accumulated, not only occupies land, but also emits sulfur-containing gas to pollute atmosphere, endangers environment and even can spontaneously combust to cause fire. The coal slag actually contains a certain amount of calcium, so that a method for flue gas desulfurization by using the coal slag instead of lime can be developed.
Disclosure of Invention
Aiming at solving the mining problems of environmental protection and the like in the prior art; the invention aims to provide a method for preparing alkali liquor by using coal cinder and replacing a desulfurizing agent.
The invention relates to a method for preparing alkali liquor and replacing a desulfurizer by utilizing coal cinder, which comprises the following steps:
1. selecting coal cinder: selecting coal slag generated by a coal gas producer;
2. detecting the calcium content of the coal cinder: adopting coal cinder with calcium content of more than 27%;
3. soaking: soaking qualified coal cinder in water for about 10 minutes according to the standard that every 25 g of coal cinder is soaked in 1500 ml of water;
4. and (3) precipitation: precipitating for 3-5 min after soaking, and extracting alkaline water;
5. and (3) detecting the pH value: detecting the pH value of the alkaline water extracted in the step 4 by an instrument or test paper, wherein the pH value is about 13, and the qualified alkaline water to be used (namely the liquid desulfurizer) is obtained;
6. namely, the alkaline water in the step 5 is used for wet desulphurization, the alkaline water is added into a desulphurization water pool to replace a medicament, and the PH value of the desulphurization water pool is adjusted to 8-10.
Preferably, the coal cinder to be used is selected by a sampling inspection method when the calcium content of the coal cinder is detected in the step 2.
Preferably, the soaking process in the step 3 can be uniformly stirred for 2-3 minutes, and the coal cinder is submerged in water in the whole process.
Preferably, the soaking time in the step 3 can be prolonged according to the amount of the coal cinder.
Preferably, if the detected alkaline water in step 5 does not reach the specified PH, a small amount of slaked lime powder or particles may be added to the water to adjust the PH.
The pH value can be adjusted in the step 5 by adopting the following method: a small amount of limestone is crushed into particles, sprayed into liquid slag along with secondary air of a boiler, and melted by utilizing the temperature of the slag without participating in the combustion process. After the calcium is increased, the sulfur in the coal can be absorbed, calcium sulfide is generated and becomes an active component in the slag, and the sulfur dioxide discharged into the atmosphere can be reduced. The liquid slag can adopt a water quenching process, 85% of liquid slag and 15% of fly ash are discharged instead of the original 85% of fly ash and 15% of liquid slag, so that the dust removal load is reduced, the difficulty in stacking the fly ash is also reduced, and water after quenching can be recycled, thereby saving water resources and cost.
The coal slag generated by the coal gas producer is limestone, the content of calcium in the coal is higher, the coal slag is not any coal slag, other kilns cannot burn the coal slag, the coal slag belongs to common solid waste, after the coal slag is utilized, the coal slag does not influence the coal slag, the pollution can be reduced, and the waste is recycled.
Compared with the prior art, the invention has the beneficial effects that: the method has the advantages of simple process, convenient operation, good flexibility and environmental protection, the waste coal slag is recycled, lime with trouble in mining is replaced, the decomposed coal slag water is used for wet desulphurization, elements which pollute the environment in the remaining coal slag are reduced, the auxiliary solid wastes such as new desulphurization generated desulphurization slag are reduced, the mining resources of the existing desulfurizer mineral products are saved, the desulphurization cost of enterprises is reduced, the enterprises can continuously and truly implement the environment-friendly desulphurization work, and meanwhile, the pollution to the surrounding environment and soil is reduced due to the landfill of the coal slag. The method is a mode and method which is beneficial to social environment, enterprises and solid waste disposal, and plays an active and great contribution role in creating environment-friendly and resource-saving two types of society.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by way of specific embodiments. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The first embodiment is as follows:
the method for preparing alkali liquor and replacing desulfurizer by using coal cinder in the embodiment comprises the following steps:
1. selecting coal cinder: selecting coal slag generated by a coal gas producer;
2. detecting the calcium content of the coal cinder: adopting coal cinder with calcium content of more than 27%;
3. soaking: soaking the qualified coal cinder in water for 10-20 min, wherein the soaking time can be 300 liters of water per 500 g of coal cinder; the mixture can be evenly stirred for about 10 minutes in the soaking process, and the coal slag is submerged in water in the whole process;
4. and (3) precipitation: precipitating for about 15 minutes after soaking, and extracting alkaline water;
5. and (3) detecting the pH value: detecting the pH value of the alkaline water extracted in the step 4 through an instrument or test paper, wherein the qualified alkaline water to be used is detected when the pH value is about 13; detecting unqualified alkaline water to reach the designated pH value through a blending mode;
6. namely, the alkaline water in the step 5 is used for wet desulphurization, the alkaline water is added into a desulphurization water pool to replace a medicament, and the PH value of the desulphurization water pool is adjusted to 8-10.
Example two:
the method for preparing alkali liquor and replacing desulfurizer by using coal cinder in the embodiment comprises the following steps:
1. selecting coal cinder: selecting coal slag generated by a coal gas producer;
2. detecting the calcium content of the coal cinder: adopting coal cinder with calcium content of more than 27%; selecting the coal cinder to be used by a sampling inspection method when the calcium content of the coal cinder is detected;
3. soaking: soaking the qualified coal cinder in water, wherein the soaking time is about 30 minutes according to that each 1000 kg of the coal cinder is soaked in 600 liters of water; the mixture can be evenly stirred for 10 minutes in the soaking process, and the coal slag is submerged in water in the whole process;
4. and (3) precipitation: precipitating for about 20 minutes after soaking, and extracting alkaline water;
5. and (3) detecting the pH value: detecting the pH value of the alkaline water extracted in the step 4 through an instrument or test paper, wherein the qualified alkaline water to be used is detected when the pH value is about 13; if the detected alkaline water does not reach the specified pH value, a small amount of hydrated lime powder or particles can be added into the water to adjust the pH value;
6. namely, the alkaline water in the step 5 is used for wet desulphurization, the alkaline water is added into a desulphurization water pool to replace a medicament, and the PH value of the desulphurization water pool is adjusted to 8-10.
The working principle of the specific embodiment is as follows: the coal slag generated by the coal gas producer is also limestone, the calcium content in the coal slag is higher, the coal slag belongs to common solid waste, and after the coal slag is utilized, the coal slag does not influence the coal slag, can reduce pollution and can reuse the waste; the waste coal cinder is recycled, lime which is troublesome to exploit is replaced, the decomposed coal cinder water is used for wet desulphurization, elements which pollute the environment in the remaining coal cinder are reduced greatly, the auxiliary solid wastes such as new desulphurization generated desulphurization slag are reduced, the mineral exploitation resources of the existing desulfurizer are saved, the desulphurization cost of an enterprise is reduced, the sustainable and true implementation of desulphurization environment-friendly work of the enterprise is realized, and meanwhile, the pollution to the surrounding environment and soil is reduced due to the landfill of the coal cinder.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A method for preparing alkali liquor and replacing desulfurizer by utilizing coal cinder is characterized by comprising the following steps: it comprises the following steps:
(1) selecting coal cinder: selecting coal slag generated by a coal gas producer;
(2) and detecting the calcium content of the coal cinder: adopting coal cinder with calcium content of more than 27%;
(3) and soaking: soaking qualified coal cinder in water for about 10 minutes according to the standard that every 25 g of coal cinder is soaked in 1500 ml of water;
(4) and precipitating: precipitating for 3-5 min after soaking, and extracting alkaline water;
(5) and detecting the pH value: detecting the pH value of the extracted alkaline water in step 4 by an instrument or test paper, wherein the pH value is about 13, and the qualified alkaline water to be used is obtained;
(6) and (5) carrying out wet desulphurization by using the alkaline water, adding the alkaline water into the desulphurization water tank to replace a medicament, and adjusting the pH value of the desulphurization water tank to 8-10.
2. The method for preparing alkali liquor and replacing desulfurizer by using coal cinder as claimed in claim 1, wherein the method comprises the following steps: and (3) selecting the coal cinder to be used by a sampling inspection method when the calcium content of the coal cinder is detected in the step (2).
3. The method for preparing alkali liquor and replacing desulfurizer by using coal cinder as claimed in claim 1, wherein the method comprises the following steps: in the step (3), the coal slag can be evenly stirred for 2-3 minutes in the soaking process, and the coal slag is submerged in water in the whole process.
4. The method for preparing alkali liquor and replacing desulfurizer by using coal cinder as claimed in claim 1, wherein the method comprises the following steps: the soaking time in the step (3) can be prolonged according to the amount of the coal cinder.
5. The method for preparing alkali liquor and replacing desulfurizer by using coal cinder as claimed in claim 1, wherein the method comprises the following steps: if the detected alkaline water does not reach the specified pH value in the step (5), a small amount of slaked lime powder or particles can be added into the water to adjust the pH value.
6. The method for preparing alkali liquor and replacing desulfurizer by using coal cinder as claimed in claim 1, wherein the method comprises the following steps: it comprises the following steps:
(1) selecting coal cinder: selecting coal slag generated by a coal gas producer;
(2) and detecting the calcium content of the coal cinder: adopting coal cinder with calcium content of more than 27%;
(3) and soaking: soaking the qualified coal cinder in water for 10-20 min, wherein the soaking time can be 300 liters of water per 500 g of coal cinder; the mixture can be evenly stirred for about 10 minutes in the soaking process, and the coal slag is submerged in water in the whole process;
(4) and precipitating: precipitating for about 15 minutes after soaking, and extracting alkaline water;
(5) and detecting the pH value: detecting the pH value of the extracted alkaline water in step 4 by an instrument or test paper, wherein the pH value is about 13, and the qualified alkaline water to be used is obtained; the off-specification base water is detected to reach the specified PH by means of a tempering.
(6) And (5) carrying out wet desulphurization by using the alkaline water, adding the alkaline water into the desulphurization water tank to replace a medicament, and adjusting the pH value of the desulphurization water tank to 8-10.
7. The method for preparing alkali liquor and replacing desulfurizer by using coal cinder as claimed in claim 1, wherein the method comprises the following steps: it comprises the following steps:
(1) selecting coal cinder: selecting coal slag generated by a coal gas producer;
(2) and detecting the calcium content of the coal cinder: adopting coal cinder with calcium content of more than 27%; selecting the coal cinder to be used by a sampling inspection method when the calcium content of the coal cinder is detected;
(3) and soaking: soaking the qualified coal cinder in water, wherein the soaking time is about 30 minutes according to that each 1000 kg of the coal cinder is soaked in 600 liters of water; the soaking process can be evenly stirred for 10 minutes, and the coal slag is submerged in water in the whole process.
(4) And precipitating: precipitating for about 20 minutes after soaking, and extracting alkaline water;
(5) and detecting the pH value: detecting the pH value of the extracted alkaline water in step 4 by an instrument or test paper, wherein the pH value is about 13, and the qualified alkaline water to be used is obtained; if the detected alkaline water does not reach the specified pH value, a small amount of hydrated lime powder or particles can be added into the water to adjust the pH value;
(6) and (5) carrying out wet desulphurization by using the alkaline water, adding the alkaline water into the desulphurization water tank to replace a medicament, and adjusting the pH value of the desulphurization water tank to 8-10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910912606.5A CN110624387A (en) | 2019-09-25 | 2019-09-25 | Method for preparing alkali liquor and replacing desulfurizer by using coal cinder |
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| CN201910912606.5A CN110624387A (en) | 2019-09-25 | 2019-09-25 | Method for preparing alkali liquor and replacing desulfurizer by using coal cinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588796A (en) * | 2020-12-31 | 2021-04-02 | 唐山燕山钢铁有限公司 | Method for effectively separating slag iron of KR desulfurization slag |
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| CN101496983A (en) * | 2009-01-21 | 2009-08-05 | 蒋利群 | Coal burning system with novel desulfurizer |
| CN201431848Y (en) * | 2009-07-03 | 2010-03-31 | 福建建华管桩有限公司 | Desulfuration device for cinder and waste alkali utilization |
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2019
- 2019-09-25 CN CN201910912606.5A patent/CN110624387A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0848640A1 (en) * | 1995-09-07 | 1998-06-24 | AUSTRIAN ENERGY & ENVIRONMENT SGP/WAAGNER-BIRO GmbH | Process and device for scrubbing acidic gases |
| CN101475865A (en) * | 2009-01-21 | 2009-07-08 | 蒋利群 | Method for preparing desulfurizer from coal slag |
| CN101496983A (en) * | 2009-01-21 | 2009-08-05 | 蒋利群 | Coal burning system with novel desulfurizer |
| CN201431848Y (en) * | 2009-07-03 | 2010-03-31 | 福建建华管桩有限公司 | Desulfuration device for cinder and waste alkali utilization |
Non-Patent Citations (1)
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| 胡道玖: "《能源经济管理经典案例解析》", 31 December 2015, 上海交通大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588796A (en) * | 2020-12-31 | 2021-04-02 | 唐山燕山钢铁有限公司 | Method for effectively separating slag iron of KR desulfurization slag |
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