CN111392811A - Multi-energy-field synergistic efficient dehydration method for coal gasification fine slag black water of entrained flow bed - Google Patents
Multi-energy-field synergistic efficient dehydration method for coal gasification fine slag black water of entrained flow bed Download PDFInfo
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- CN111392811A CN111392811A CN202010142896.2A CN202010142896A CN111392811A CN 111392811 A CN111392811 A CN 111392811A CN 202010142896 A CN202010142896 A CN 202010142896A CN 111392811 A CN111392811 A CN 111392811A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a multi-energy field collaborative high-efficiency dehydration method for coal gasification fine slag black water of an entrained flow bed, which comprises the following steps: treating the gasified fine slag obtained from the gasification furnace by a Venturi scrubber to obtain black water, and concentrating the black water in a concentration tank; pumping the black water to a vacuum force field dehydration system through a pump, and dehydrating to obtain a filter cake; conveying the filter cake to a vibration and pressure coupling force field dehydration system through a belt conveyor for further dehydration; conveying the filter cake to a hot flue gas drying system through a belt conveyor for further dehydration, and performing heat exchange between the filter cake and hot flue gas for further dehydration; mixing the water removed by the vacuum force field dehydration system into the water of a factory for recycling; and conveying the filter cake obtained by the hot flue gas drying system to a power boiler working section to be co-fired with raw coal for decarburization. The invention finally obtains the low-moisture filter cake which can meet the requirements of transportation and pulverization, reduces the problem of soil and underground water pollution caused by filter cake landfill, and simultaneously realizes the high-efficiency and clean utilization of coal-series solid waste resources.
Description
Technical Field
The invention relates to a dehydration method of gasified fine slag black water, in particular to a multi-energy-field synergistic efficient dehydration method of gasified fine slag black water of an entrained flow bed.
Background
Coal has an important strategic position in national economy and social development in China, and accounts for 27.62 percent of world important primary energy. The gasification technology is one of the core technologies for efficient and clean conversion of coal, and in the modern coal chemical industry production, coal chemicals, coal natural gas, coal liquid fuel, IGCC and other processes all take coal gasification as a source. Coal consumption of China for gasification industry exceeds 250Mt, and coal-based solid waste becomes one of the most main sources of industrial solid waste in China. At present, a large-scale gasification device mostly adopts a coal water slurry or pulverized coal entrained flow bed gasification technology, and generated waste slag consists of two parts, wherein one part is coarse slag discharged from a furnace bottom, the other part is fine particle slag-fine slag carried by coal gas, the proportion of the gasified fine slag is about 50%, and the carbon content is up to 25-60% (related to gasification efficiency). In order to remove fine slag in coal gas, the existing process mostly adopts circulating water for washing, and the washed water contains pollutants such as heavy metal ions, phenols, cyanides and the like released in the high-temperature coal gasification process.
At present, the flocculated gasified fine slag slurry is dewatered by a vacuum filter cloth filter to obtain a fine slag filter cake with the water content of 50-60%, and the conventional main treatment mode of fine slag is manual landfill, so that the environment is polluted greatly. At least 80Mt of coal gasification fine slag is expected to be generated in China every year in 2021, which becomes a bottleneck limiting sustainable clean utilization of coal. Therefore, obtaining an efficient method for gasifying the fine slag black water is an imminent scientific problem. The moisture content in the fly ash can be reduced by utilizing heat energy through an evaporation drying mode, but a large amount of energy is consumed, the energy efficiency ratio is low, and the development of a high-efficiency and low-energy-consumption gasification fine slag drying technology has important significance. The gasified fine slag has fine particles, developed pores, large specific surface area, more O-Si bonds and difficult dehydration, so the gasified fine slag can be matched with a corresponding synergistic energy field for dehydration according to the characteristics to obtain a low-moisture filter cake. The characteristics of energy such as a temperature field, a pressure field, a vacuum force field, a vibration force field and the like are considered, the water holding characteristics of materials are combined, the dehydration energy is input, sequenced and matched in a gradient manner, and the high-efficiency dehydration of the gasified fine slag black water is finally realized.
In summary, the requirement of China on harmless treatment of solid wastes is increasingly strict, coal gasification enterprises which cannot properly treat filter cakes are difficult to survive, and the technical requirement of the market on efficient dehydration of coal gasification black water is increasingly urgent. If the efficient dehydration of the gasified fine slag black water can be realized, a low-moisture filter cake meeting the requirements of transportation and pulverization is obtained, and filtered water with high cleanliness is obtained, a technical scheme for supplementing the solid waste treatment of the coal gasification industry is provided, and reference is provided for the efficient and sustainable development of coal.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a multi-energy-field synergistic high-efficiency dehydration method for coal gasification fine slag black water of an entrained flow bed, so as to solve the problems of low dehydration efficiency of the existing fine slag black water and high water content of a filter cake.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-energy-field synergistic efficient dehydration method for entrained flow coal gasification fine slag black water comprises the following steps:
step a, treating gasified fine slag obtained from a gasification furnace by a Venturi scrubber to obtain black water, and concentrating the black water in a concentration tank to provide a raw material for subsequent dehydration treatment;
b, controlling the mass content of the gasified fine slag in the black water to a preset value, and conveying the black water to a dehydration working section;
step c, pumping the black water to a vacuum force field dehydration system through a pump, and dehydrating to obtain a filter cake;
d, conveying the filter cake obtained in the step c to a vibration and pressure coupling force field dehydration system through a belt conveyor for further dehydration;
e, conveying the filter cake obtained in the step d to a hot flue gas drying system through a belt conveyor for further dehydration, and performing heat exchange between the filter cake and hot flue gas for further dehydration;
step f, mixing the water removed by the vacuum force field dehydration system into the water of a factory for recycling;
and g, conveying the filter cake obtained by the hot flue gas drying system to a power boiler working section to be co-fired with raw coal for decarburization.
And in the step b, when the mass content of the gasified fine slag in the black water is controlled to be 3-20%, the black water is conveyed to a dehydration working section.
In the step c, the vacuum degree is controlled to be more than 0.08MPa, a filter cake with the thickness of 3-6 mm is obtained, and the water mass content of the filter cake is 40-45%.
In the step d, the dehydration conditions are as follows: and (3) dehydrating for 3min under the conditions that the pressure is 10-12 Mpa, the vibration force is 3-3.5 Mpa and the frequency is 30-45 Hz to obtain a filter cake with the water mass content of 30-32%.
In the step e, the hot flue gas is hot flue gas of a power boiler of a factory, the temperature of the hot flue gas is 220-240 ℃, and a filter cake with the moisture mass content of 10-15% is obtained.
And detecting the water content of the filter cake through an oven or a rapid water content tester to obtain the water mass content of the filter cake.
And g, treating the hot flue gas used by the hot flue gas drying system according to the original process.
Has the advantages that: according to the entrained-flow bed coal gasification fine slag black water multi-energy field cooperative efficient dehydration method provided by the invention, through sequencing and matching of energy of a temperature field, a pressure field, a vacuum force field, a vibration force field and the like, a low-moisture filter cake capable of meeting transportation and pulverization is finally obtained, the problem of soil and underground water pollution caused by filter cake landfill is reduced, and meanwhile, efficient and clean utilization of coal-based solid waste resources is realized. Effectively reduces the water content of the fine slag filter cake, meets the powdering requirement, and widens the resource utilization range of coal series solid wastes. Compared with the prior art, the method has the following advantages:
1. the invention reduces the water content of the filter cake. According to the invention, through the synergistic dehydration effect of multiple energy fields, the water content of the gasified fine slag filter cake can be reduced to 10-15%, which is far lower than that (50-60%) of the filter cake obtained by a single energy input vacuum filter cloth machine adopted in the conventional gasification plant.
2. The dehydration efficiency is improved. The invention adopts various energy sequencing and matching modes to dehydrate the fine slag black water to obtain the low-moisture filter cake, thereby greatly improving the dehydration time and saving the energy consumption compared with the traditional drying dehydration method.
3. Reducing environmental pollution and saving water resources. The invention can obtain low-moisture filter cakes and reduce the pollution problem caused in the transportation and landfill processes. In addition, coal gasification enterprises in China are mostly distributed in regions with water resource shortage in northwest, and water which is removed more can be recycled, so that water resources are saved.
4. Widens the resource utilization range of the coal series solid wastes. The water content of the filter cake obtained by the treatment of the invention can be reduced to 10-15%, the powdering requirement is met, the carbon content of the fine slag is 25-60%, the high-carbon-content fine slag after the powdering treatment can be mixed with raw coal for co-combustion, the energy is recovered, and the utilization rate of coal resources is improved.
Drawings
FIG. 1 is a flow chart of multi-energy field cooperative efficient dehydration of coal gasification fine slag and black water of an entrained flow bed.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the method for the synergistic high-efficiency dehydration of the coal gasification fine slag black water of the entrained flow bed in a multi-energy field comprises various dehydration energy forms and input sequences, and the dehydration process of the coal gasification fine slag black water comprises three steps: (1) carrying out first-step dehydration on black water with the water content of 80-97% by mass through a vacuum force field, wherein the vacuum degree is controlled to be more than 0.08 MPa; (2) further dehydrating the filter cake in the last step by using a vibration and pressure coupling force field, wherein the pressure is 10-12 Mpa, the vibration force is 3-3.5 Mpa, and the frequency is 45Hz to obtain a further dehydrated filter cake; (3) and (3) carrying out heat exchange on hot flue gas temperature of the power boiler of the factory at 220-240 ℃ with the filter cake in the last step by utilizing the flue gas temperature, and further dehydrating. Through the three steps of dehydration, the low-moisture filter cake meeting the requirements of transportation and pulverization is finally obtained.
In the invention, the dehydration process needs to be carried out according to the following sequence: the first step is vacuum force field, the second step is vibration and pressure field, and the third step is flue gas heat exchange dehydration.
The present invention will be further described with reference to the following examples.
Examples
A multi-energy-field synergistic efficient dehydration method for entrained flow coal gasification fine slag black water comprises the following steps:
step a, treating gasified fine slag obtained from a gasification furnace by a Venturi scrubber to obtain black water, and concentrating the black water in a concentration tank to provide raw materials for next dehydration;
b, when the mass content of the gasified fine slag in the black water is controlled to be 3-20%, conveying the black water to a dehydration working section;
step c, pumping the gasified fine slag black water to a vacuum force field system, controlling the vacuum degree to be more than 0.08MPa, and obtaining a filter cake with the thickness of 3-6 mm, wherein the water content of the filter cake is 40-45% by mass;
d, conveying the filter cake obtained in the step c to a vibration and pressure coupling force field system through a belt conveyor for further dehydration, wherein the pressure is 10-12 Mpa, the vibration force is 3-3.5 Mpa, the frequency is 30-45 Hz, and the filter cake with the water content of 30-32% is obtained after 3min of dehydration time;
step e, conveying the filter cake obtained in the step d to a hot flue gas drying system through a belt conveyor for further dehydration, and performing heat exchange on the filter cake and hot flue gas for further dehydration to obtain a filter cake with the water mass content of 10-15%;
step f, the vacuum force field system has large water removal amount and high clarity, and can be considered to be mixed into factory water for recycling;
and g, treating the hot flue gas according to the original flue gas purification process of a factory, and conveying a low-moisture filter cake obtained by a hot flue gas drying system to a power boiler working section to be subjected to co-combustion with raw coal for decarburization, so as to recover energy.
The water content of the filter cake can be detected through an oven or a rapid water content tester, the treatment capacity of the filter cake is within a reasonable range, the continuous operation of the dehydration process is ensured, and the heating value and the combustion parameters of the mixed and co-fired filter cake and the raw coal are controlled within the design parameter range of the boiler.
According to the invention, according to the form difference of the gasified fine slag black water, a vacuum force field, a pressure field, a vibration force field and heat energy are pertinently matched in stages, and a filter cake with low moisture content is obtained through the synergistic effect of multiple energy fields, so that high-efficiency and low-energy-consumption dehydration is realized. The filtered water obtained by the dehydration system of the invention (especially the filtered water obtained in the dehydration process of the vacuum force field) can be recycled, the filter cake has low water content and is easy to be pulverized, and the energy recovery of carbon residue can be realized by secondary combustion in a boiler while purer coal ash can be obtained for the construction industry.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. A multi-energy-field synergistic efficient dehydration method for entrained flow coal gasification fine slag black water is characterized by comprising the following steps: the method comprises the following steps:
step a, treating gasified fine slag obtained from a gasification furnace by a Venturi scrubber to obtain black water, and concentrating the black water in a concentration tank to provide a raw material for subsequent dehydration treatment;
b, controlling the mass content of the gasified fine slag in the black water to a preset value, and conveying the black water to a dehydration working section;
step c, pumping the black water to a vacuum force field dehydration system through a pump, and dehydrating to obtain a filter cake;
d, conveying the filter cake obtained in the step c to a vibration and pressure coupling force field dehydration system through a belt conveyor for further dehydration;
e, conveying the filter cake obtained in the step d to a hot flue gas drying system through a belt conveyor for further dehydration, and performing heat exchange between the filter cake and hot flue gas for further dehydration;
step f, mixing the water removed by the vacuum force field dehydration system into the water of a factory for recycling;
and g, conveying the filter cake obtained by the hot flue gas drying system to a power boiler working section to be co-fired with raw coal for decarburization.
2. The entrained-flow coal gasification fine slag black water multi-energy-field collaborative high-efficiency dehydration method according to claim 1, characterized in that: and in the step b, when the mass content of the gasified fine slag in the black water is controlled to be 3-20%, the black water is conveyed to a dehydration working section.
3. The entrained-flow coal gasification fine slag black water multi-energy-field collaborative high-efficiency dehydration method according to claim 1, characterized in that: in the step c, the vacuum degree is controlled to be more than 0.08MPa, a filter cake with the thickness of 3-6 mm is obtained, and the water mass content of the filter cake is 40-45%.
4. The entrained-flow coal gasification fine slag black water multi-energy-field collaborative high-efficiency dehydration method according to claim 1, characterized in that: in the step d, the dehydration conditions are as follows: and (3) dehydrating for 3min under the conditions that the pressure is 10-12 Mpa, the vibration force is 3-3.5 Mpa and the frequency is 30-45 Hz to obtain a filter cake with the water mass content of 30-32%.
5. The entrained-flow coal gasification fine slag black water multi-energy-field collaborative high-efficiency dehydration method according to claim 1, characterized in that: in the step e, the hot flue gas is hot flue gas of a power boiler of a factory, the temperature of the hot flue gas is 220-240 ℃, and a filter cake with the moisture mass content of 10-15% is obtained.
6. The entrained flow coal gasification fine slag black water multi-energy-field synergistic high-efficiency dehydration method according to claim 3, 4 or 5, characterized in that: and detecting the water content of the filter cake through an oven or a rapid water content tester to obtain the water mass content of the filter cake.
7. The entrained-flow coal gasification fine slag black water multi-energy-field collaborative high-efficiency dehydration method according to claim 1, characterized in that: and g, treating the hot flue gas used by the hot flue gas drying system according to the original process.
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Cited By (3)
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| CN113028418A (en) * | 2021-03-30 | 2021-06-25 | 宁夏神耀科技有限责任公司 | Treatment system and method for blending-burning gasified fine slag of circulating fluidized bed boiler |
| CN113074364A (en) * | 2021-04-07 | 2021-07-06 | 宁夏神耀科技有限责任公司 | System and method for treating fine slag generated by blending combustion and gasification of pulverized coal boiler |
| CN114474819A (en) * | 2022-01-12 | 2022-05-13 | 中国矿业大学 | Device and method for quickly dehydrating coal gasification fine slag and demolding molded blocks by continuously applying vacuum force and pressure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113028418A (en) * | 2021-03-30 | 2021-06-25 | 宁夏神耀科技有限责任公司 | Treatment system and method for blending-burning gasified fine slag of circulating fluidized bed boiler |
| CN113074364A (en) * | 2021-04-07 | 2021-07-06 | 宁夏神耀科技有限责任公司 | System and method for treating fine slag generated by blending combustion and gasification of pulverized coal boiler |
| CN114474819A (en) * | 2022-01-12 | 2022-05-13 | 中国矿业大学 | Device and method for quickly dehydrating coal gasification fine slag and demolding molded blocks by continuously applying vacuum force and pressure |
| CN114474819B (en) * | 2022-01-12 | 2023-07-25 | 中国矿业大学 | Device and method for rapid dehydration and block demolding of coal gasification fine slag |
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