CN102807902B - Secondary purification method of coke oven gas - Google Patents
Secondary purification method of coke oven gas Download PDFInfo
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- CN102807902B CN102807902B CN201210301080.5A CN201210301080A CN102807902B CN 102807902 B CN102807902 B CN 102807902B CN 201210301080 A CN201210301080 A CN 201210301080A CN 102807902 B CN102807902 B CN 102807902B
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Abstract
The invention provides a secondary purification method of coke oven gas, and the secondary purification method comprises steps of primary filtering, cooling, adsorption, fine filtering and heating, and is characterized in that firstly coke oven gas is filtered through coke to obtain first coal gas; after being compressed, the first coal gas is cooled to 40 to 50 DEG C to obtain second coal gas; the second coal gas is adsorbed and eluted by porous solid adsorption agent to obtain third coal gas; the third coal gas is filtered through hollow fiber filter materials to obtain fourth coal gas after the pretreatment step; and the third coal gas is heated to 70 to 80 DEG C to obtain the purified coal gas. Due to the adoption of the secondary purification method of the coke oven gas, technical problems that the coke oven gas is incompletely purified to cause the corrosion of gas turbine and short service life can be solved.
Description
Technical field
The present invention relates to coke-oven gas field, especially, relate to a kind of secondary-cleaned method of coke-oven gas.
Background technology
Coke-oven gas is a kind of combustible industrial waste gas, is conventionally discharged in air in the past, so not only causes energy dissipation, the air ambient of having gone back severe contamination.Internal combustion turbine can utilize coke-oven gas to generate electricity and heat supply, and coke-oven gas is carried out to second stage employ, but it is more in coke-oven gas, to contain impurity, has affected the work-ing life of internal combustion turbine.
In order to improve the work-ing life of internal combustion turbine, conventionally coke-oven gas is carried out to purifying treatment.In prior art, most of adopt just cold, wash ammonia, cold, the gas purification of washing benzene or claim coal-gas recovering technique eventually.But can only meet the requirement of ordinary combustion use gas according to above-mentioned gas purification process, coal gas also contains impurity such as not being cleaned in a large number dust, tar, metal and nonmetallic ion, these impurity easily make internal combustion turbine produce corrosion, affect work-ing life.
In the generate electricity project of operation, only before compression He before entering internal combustion turbine, be provided with simple filter at present.The filter core of this strainer is processed by Stainless Steel Cloth, there is the problem that filtering accuracy is not high, can only remove the oarse-grained dust in gas, can not remove the impurity such as tar, hydrogen sulfide in coke-oven gas, still there is gas turbine blades seriously corroded, the problem that operation life is short.For the secondary-cleaned of coke-oven gas, domestic do not have ready-made technology and refining plant to use at present, and Sweet natural gas is generally all used in external gas turbine power generation, less to the deep purifying research of coke-oven gas.
Summary of the invention
The object of the invention is to provide a kind of secondary-cleaned method of coke-oven gas, incomplete to solve in prior art coke oven gas purification, causes internal combustion turbine perishable, the technical problem that work-ing life is short.
For achieving the above object, the invention provides a kind of secondary-cleaned method of coke-oven gas, it is characterized in that, comprise the following steps:
1) initial filter: coke-oven gas is obtained to the first coal gas by coke filtration, and described coke is the particle of particle diameter 25～30mm;
2) cooling: after the first coal gas is compressed, to be cooled to 40～50 DEG C and to obtain the second coal gas;
3) absorption: the second coal gas is obtained to the 3rd coal gas by porousness solid adsorbent absorb-elute;
4) essence filter: the 3rd coal gas, through pre-treatment step, is then obtained to the 4th coal gas by tubular fibre media filtration, and described tubular fibre filtrate is from top to bottom progressively arranged to densification from loosening by density;
5) heating: the 4th heated by gas to 70～80 DEG C are purified to coal gas.
Further, coke can pass into the steam of 150 DEG C and regenerates for 20～40 days.
Further, in adsorption step, porousness solid adsorbent is one or more in silica gel, activated alumina, gac, activated coke, carbon fiber.
Further, porousness solid adsorbent can pass into the steam of 150 DEG C or the purification coal gas of 150 DEG C is regenerated for 15～20 days.
Further, in essence filter step pre-treatment step for the 3rd coal gas is carried out settlement separate under 1～2m/s flow velocity.
Further, in the 4th coal gas >=particle residue rate≤1% of 10um, the particle residue rate of >=15um is 0%.
The present invention has following beneficial effect:
The secondary-cleaned method of coke-oven gas provided by the invention, is greater than rejection >=99% of 10 μ m particles for particle diameter; Be greater than rejection >=100% of 15 μ m particles for particle diameter, can effectively remove the inorganic or organic impuritys such as dust in coke-oven gas, naphthalene, tar, can effectively slow down the corrosive nature of impeller in internal combustion turbine, extend the work-ing life of internal combustion turbine.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the process flow diagram of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
A secondary-cleaned method for coke-oven gas, is characterized in that, comprises the following steps:
1) initial filter: coke-oven gas is obtained to the first coal gas by coke filtration;
2) cooling: the first coal gas to be cooled to 40～50 DEG C and to obtain the second coal gas;
3) absorption: the second coal gas is obtained to the 3rd coal gas by porousness solid adsorbent absorb-elute;
4) essence filter: the 3rd coal gas, through pre-treatment step, is then obtained to the 4th coal gas by tubular fibre media filtration;
5) heating: the 4th heated by gas to 70～80 DEG C are purified to coal gas.
The coke-oven gas secondary-cleaned method that the present invention adopts is for coke-oven gas being carried out after primary purification again to secondary-cleaned, the method for primary purification comprise just cold, wash ammonia, eventually cold, wash benzene step; Secondary-cleaned comprises initial filter, cooling, absorption, essence filter and heating steps.Initial filter step adopts coke filter tentatively to filter coke-oven gas, and coke has certain aperture, can remove oarse-grained dust, and coke has good adsorption effect to high boiling tar component simultaneously, can adsorb part naphthalene and tar in coke-oven gas.Owing to containing part moisture in coke-oven gas, moisture will affect follow-up absorption and essence filter step, and the present invention adopts cooling step to remove the moisture in the first coal gas.Corresponding relation between vapor pressure and temperature that water exists in coal gas, by reducing the temperature of coke-oven gas, makes the supersaturation and being condensed at low temperatures of water vapour in gas, reaches the object of separation; In the time that temperature reaches 40～50 DEG C, can make to reach in coke-oven gas gas-liquid separation; Naphthalene in while coke-oven gas is become solid-state in temperature-fall period from gaseous state, thereby removes moisture content and the naphthalene impurity in gas.On a small quantity can not be by the organic and inorganic impurity of coke disposal through also existing in the second coal gas of cooling step, porousness solid adsorbent can be according to various organic and inorganic impurities in the composition selective adsorption gas in coke-oven gas, remove the organic and inorganic impurities such as tar in coke-oven gas, hydrogen sulfide, naphthalene, basic metal, reach the object of purification.In the 3rd coal gas after adsorption treatment, also there is the dust and the tar that are not adsorbed and filter, first the present invention carries out pre-treatment to coke-oven gas, removing particle diameter is impurity more than 100 μ m, prevents that impurity particle diameter is excessive, causes subsequent fine filter step easily to be stopped up; Then pretreated coke-oven gas is removed to fine solid particle and part tar more than 5 μ m by tubular fibre filtrate, the impurity less to the particle diameter in coke-oven gas further purifies.Because coke-oven gas need to carry out combustion power generation, if contain liquid water in coal gas and had a strong impact on the efficiency of combustion of coke-oven gas, also easily cause internal combustion turbine corrosion simultaneously; In order thoroughly to remove the liquid water in coke-oven gas, the present invention, by the 4th heated by gas to 70～80 DEG C, makes the temperature of coke-oven gas more than 20 DEG C, ensure that coke-oven gas is fully dry higher than dew-point temperature.The coke oven gas purification method that the present invention adopts comprises that initial filter, cooling, absorption, essence filter and heating steps carry out deep layer purification to coke-oven gas, thoroughly remove the impurity such as the moisture content in coke-oven gas, dust, tar, naphthalene, hydrogen sulfide, basic metal, ensured the work-ing life of internal combustion turbine.In order to ensure the normal operation of each equipment, after cooling step, all pipelines and equipment are all incubated processing, prevent that temperature is lower than dew-point temperature simultaneously, affect equipment operation.
What initial filter step adopted is that coke filter carries out Filtration Adsorption to coke-oven gas, in coke filter, be filled with the coke granule of diameter 25～30mm left and right size, high boiling tar component is had to good adsorption effect, its adsorption efficiency reaches more than 40%, simultaneously, coke can be removed the dust in coke-oven gas, and naphthalene is also had to certain adsorption.
Further, coke duration of service can reach 10～12 months, after coke absorption reaches capacity, need STRENGTH ON COKE to regenerate.The renovation process of coke is to pass into steam or 150 DEG C of purification coal gas of 150 DEG C, and the regeneration period is 20～40 days, after coke regeneration, also has adsorption effect, can reuse, and has saved production cost, has reduced the discharge of waste residue, more energy-conserving and environment-protective.Above-mentioned purification coal gas is the coal gas of coke-oven gas after secondary-cleaned.
Simultaneously the present invention, in the design process of purification process, has used two coke filtering devices, and one in use state, and another one is as for subsequent use; After the coke filtering device absorption in using state is saturated, can proceed to the coke filtering device of stand-by state at once, remove dismounting from, the unnecessary steps such as filling, incur loss through delay and produce.And the coke filtering device of the state of use, can utilize the remaining thermogenetic steam after gas turbine power generation to regenerate, or the purification coal gas STRENGTH ON COKE filtration unit after secondary-cleaned is regenerated, the waste gas of producing is made full use of, ensure energy reusable edible, energy-conserving and environment-protective more.
The coke filtering device that coke filtering device is announced for utility model patent ZL200920266004.9.
Adsorption step is according to absorption principle, selects water vapour and various organic and inorganic gas in some porousness solid adsorbent adsorbed gas.Wherein silica gel, activated alumina and molecular sieve can play dehydration, remove the effect of inorganics; And gac, activated coke and carbon fiber can be removed the organism in coke-oven gas.Gas before and after absorption after absorption is all by wire mesh demister, and liquid and the oarse-grained solid particulate matter of removal in gas is to adsorb more completely, purifies more thorough.The filtering net of wire mesh demister is stainless steel metal wire.
Further, can reach 6～12 months the duration of service of porousness solid adsorbent to porousness solid adsorbent.After porousness solid adsorbent reaches capacity, steam or the purification coal gas that can pass into 150 DEG C are regenerated, regeneration period is 15～20 days, after the regeneration of porousness solid absorption material, also there is adsorption effect, can reuse, save production cost, reduced the discharge of waste residue, more energy-conserving and environment-protective.Above-mentioned purification coal gas is the coal gas of coke-oven gas after secondary-cleaned.
When coke oven fuel gas is after overcooling, separation, absorption etc. are processed, send into fuel gas and be cleaned into covering device and carry out essence and filter step, carry out pre-treatment by gravity settling separation step, and then enter and in High-Performance Gas Filter, carry out further purifying treatment.High-Performance Gas Filter adopts the tubular fibre with strong adsorptive power as filtrate, filtrate is from top to bottom progressively arranged to densification from loosening by density, this arranging makes larger grit be held back at the thicker filtrate on upper strata, and less grit is trapped at the closeer filtrate of lower floor, be that dust is three-dimensional distribution in multilayer filtrate, its collection efficiency can be greater than 99.99%.The pollutant holding capability of High-Performance Gas Filter is 1000 times of filter cartridge type filters.After the impurity of trapping equal amts, High-Performance Gas Filter is that tubular fibre filtrate has very large voidage, and the relative filter cartridge type filter of resistance is much smaller, and therefore High-Performance Gas Filter can be guaranteed operation steady in a long-term and need not overhaul.High-Performance Gas Filter has high-level efficiency, low resistance, stable and reliable operation, high pollutant holding capability, height endurability concurrently simultaneously, and filtrate can be because of advantages such as pressurized damages.In essence filter step, rejection >=99% of the particle of right >=10 μ m; Rejection >=100% of >=15 μ m particles, make not contain in the solids in the 4th coal gas the particle of particle diameter >=15um, and the particle residue rate of particle diameter >=10um is only≤1%, the requirement higher than internal combustion turbine to dust content in gas.
Pre-treatment step is for to enter settling pocket by the 3rd coal gas, and making gas flow rate is 1～2m/s, at this moment large granular impurity as particle diameter be more than 100um particle because subsidence effect is separated, make essence filter step better effects if, efficiency is higher.
The present invention's fuel gas used is cleaned into covering device and can obtains by commercially available.
Embodiment
In following examples, material used is that commercially available, described device is prior art.
Embodiment 1
1) initial filter: coke-oven gas is obtained to the first coal gas by the coke filtration of diameter 28mm;
2) cooling: the first coal gas to be cooled to 45 DEG C and to obtain the second coal gas;
3) absorption: the second coal gas is obtained to the 3rd coal gas by Adsorption and desorption by active carbon;
4) essence filter: the 3rd coal gas is carried out under 1m/s gas flow rate settlement separate, then obtain the 4th coal gas by tubular fibre media filtration;
5) heating: the 4th heated by gas to 75 DEG C is purified to coal gas.
Embodiment 2
1) initial filter: coke-oven gas is obtained to the first coal gas by the coke filtration of diameter 25mm;
2) cooling: the first coal gas to be cooled to 40 DEG C of left and right and to obtain the second coal gas;
3) absorption: the second coal gas is obtained to the 3rd coal gas by PAN-ACF wash-out;
4) essence filter: the 3rd coal gas is carried out under 1.5m/s gas flow rate settlement separate, then obtain the 4th coal gas by tubular fibre media filtration;
5) heating: the 4th heated by gas to 70 DEG C is purified to coal gas.
Embodiment 3
1) initial filter: coke-oven gas is obtained to the first coal gas by the coke filtration of diameter 28mm;
2) cooling: the first coal gas to be cooled to 45 DEG C and to obtain the second coal gas;
3) absorption: the second coal gas is obtained to the 3rd coal gas by activated alumina absorb-elute;
4) essence filter: the 3rd coal gas is carried out under 2m/s gas flow rate settlement separate, then obtain the 4th coal gas by tubular fibre media filtration;
5) heating: the 4th heated by gas to 80 DEG C is purified to coal gas.
Embodiment 4
1) initial filter: coke-oven gas is obtained to the first coal gas by the coke filtration of diameter 28mm;
2) cooling: the first coal gas to be cooled to 45 DEG C and to obtain the second coal gas;
3) absorption: the second coal gas is obtained to the 3rd coal gas by silica gel adsorption wash-out;
4) essence filter: the 3rd coal gas is carried out under 2m/s gas flow rate settlement separate, then obtain the 4th coal gas by tubular fibre media filtration;
5) heating: the 4th heated by gas to 80 DEG C is purified to coal gas.
Embodiment 5
1) initial filter: coke-oven gas is obtained to the first coal gas by the coke filtration of diameter 28mm;
2) cooling: the first coal gas to be cooled to 45 DEG C and to obtain the second coal gas;
3) absorption: the second coal gas is obtained to the 3rd coal gas by activated coke absorb-elute;
4) essence filter: the 3rd coal gas is carried out under 2m/s gas flow rate settlement separate, then obtain the 4th coal gas by tubular fibre media filtration;
5) heating: the 4th heated by gas to 80 DEG C is purified to coal gas.
The residual quantity of the purification coal gas in embodiment 1～5 being carried out to the impurity such as dust, naphthalene, tar, hydrogen sulfide detects, and detected result is listed in table 1.
Coke-oven gas is coal-tar middle oil, dirt, and the detection of hydrogen sulfide, naphthalene is according to GB/T12208-2008 " artificial coal gas component and impurity determination method " and GB/T601-2002 " chemical reagent preparations of standard volumetric solutions " standard detection; Alkali metal content is according to JY-T020-1996 " Ion Chromatographic Method general rule " standard detection.When purifying, coal gas is coal-tar middle oil, particle concentration≤5mg/Nm3; Hydrogen sulfide content≤50mg/Nm3; When naphthalene content≤100mg/Nm3, P, Zn, Li, V content≤0.1mg/Kg in basic metal; When Na, K, Ca+Mg, F+Cl+Br+I≤1mg/Kg, think that gas purification is complete, can be used for gas turbine power generation.
Detected temperatures is 20 DEG C, and detecting humidity is 60%.
Table 1 impurity residues detection result table
From the detected result of table 1, tar, basic metal, dirt, hydrogen sulfide and naphthalene content in embodiment 1～5 all reach gas purification standard, prove to adopt the secondary-cleaned method of the embodiment of the present invention 1～5, can effectively remove dust and impurity in coal gas, decontamination effect improving is good, and the purification coal gas obtaining can meet the generating requirement of internal combustion turbine completely.Wherein the impurity residual quantity in embodiment 1 is minimum, and decontamination effect improving is best, is the optimum embodiment of the present invention.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a secondary-cleaned method for coke-oven gas, is characterized in that, comprises the following steps:
1) initial filter: coke-oven gas is obtained to the first coal gas by coke filtration, and described coke is the particle of particle diameter 25～30mm;
2) cooling: after described the first coal gas is compressed, to be cooled to 40～50 DEG C and to obtain the second coal gas;
3) absorption: described the second coal gas is obtained to the 3rd coal gas by porousness solid adsorbent absorb-elute;
4) essence filter: described the 3rd coal gas, through pre-treatment step, is then obtained to the 4th coal gas by tubular fibre media filtration, and described tubular fibre filtrate is from top to bottom progressively arranged to densification from loosening by density;
5) heating: by described the 4th heated by gas to 70～80 DEG C, make the temperature of coke-oven gas more than 20 DEG C, be purified coal gas higher than dew-point temperature;
Wherein, all pipelines and equipment after described cooling step are all incubated processing, prevent that temperature is lower than dew-point temperature.
2. secondary-cleaned method according to claim 1, is characterized in that, described coke can pass into the steam of 150 DEG C and regenerate for 20～40 days.
3. secondary-cleaned method according to claim 1, is characterized in that, porousness solid adsorbent described in described adsorption step is one or more in silica gel, activated alumina, gac, activated coke, carbon fiber.
4. secondary-cleaned method according to claim 3, is characterized in that, described porousness solid adsorbent can pass into the steam of 150 DEG C or the purification coal gas of 150 DEG C is regenerated for 15～20 days.
5. secondary-cleaned method according to claim 1, is characterized in that, described in described essence filter step, pre-treatment step for to carry out settlement separate by described the 3rd coal gas under 1～2m/s flow velocity.
6. secondary-cleaned method according to claim 1, is characterized in that, in described the 4th coal gas >=particle residue rate≤1% of 10um, the particle residue rate of >=15um is 0%.
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| CN103436301B (en) * | 2013-09-13 | 2015-02-25 | 上海电力学院 | Combined dust removal and desulfurization system for coal gas |
| CN205024183U (en) * | 2015-07-20 | 2016-02-10 | 耶俄利斯有限公司 | Coke oven gas processing apparatus |
| CN106179287B (en) * | 2016-08-29 | 2018-06-22 | 中冶焦耐(大连)工程技术有限公司 | Adsorbent reactivation and regeneration off gases processing method during coke-stove gas temp.-changing adsorption desulfurization |
| CN108410518B (en) * | 2018-02-05 | 2020-06-02 | 太原理工大学 | Separating device for sub-wavelength infrared heating dust-containing coal gas |
| CN114350417A (en) * | 2022-01-12 | 2022-04-15 | 新疆八一钢铁股份有限公司 | Coke oven gas purification device |
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| JPS6086194A (en) * | 1983-10-19 | 1985-05-15 | Nippon Sanso Kk | Apparatus for purifying coke oven gas |
| JP2008239892A (en) * | 2007-03-28 | 2008-10-09 | Mitsubishi Chemicals Corp | Method and system for purification of source gas |
| CN101509425B (en) * | 2009-03-19 | 2010-09-29 | 株洲南方燃气轮机成套制造安装有限公司 | Gas turbine generating set |
| CN101850949B (en) * | 2010-06-11 | 2012-05-23 | 大连理工大学 | Method with high purity and high recovery rate for purifying hydrogen gas in coke oven gas |
| CN201753341U (en) * | 2010-07-16 | 2011-03-02 | 武汉高科佳诚动力科技有限公司 | Coke oven gas purification treatment system with recycling working medium |
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