CN110467953B - Method for producing clean formed coke based on water glass transition state binder - Google Patents

Method for producing clean formed coke based on water glass transition state binder Download PDF

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CN110467953B
CN110467953B CN201910460313.8A CN201910460313A CN110467953B CN 110467953 B CN110467953 B CN 110467953B CN 201910460313 A CN201910460313 A CN 201910460313A CN 110467953 B CN110467953 B CN 110467953B
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water glass
coal
state binder
transition state
glass transition
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CN110467953A (en
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张智聪
刘守军
杨颂
史鹏政
杜文广
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Taiyuan Green Coke Energy Co ltd
Taiyuan University of Technology
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Taiyuan Green Coke Energy Co ltd
Taiyuan University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C10L5/12—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with inorganic binders

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Abstract

A method for producing clean formed coke based on a sodium silicate transition state binder comprises the steps of selecting kaolin, silica, limestone and coal liquefaction residues, respectively crushing, adding sodium silicate powder and pregelatinized starch, uniformly stirring and mixing, and then carrying out dry grinding to obtain an alumina transition state binder; selecting blended coal, uniformly mixing the blended coal and a water glass transition state binder in proportion, performing cold press molding, performing dry distillation at high temperature, and cooling to normal temperature to obtain clean formed coke; the raw materials of the invention have wide and rich sources and low price, and the invention has the effects of the cold-state binder and the hot-state binder, and has the binding effect before the cold-state binder fails and the hot-state binder acts in the pyrolysis process, thereby ensuring the forming rate and the formed coke strength of the materials in the dry distillation furnace.

Description

Method for producing clean formed coke based on water glass transition state binder
Technical Field
The invention relates to a method for producing clean formed coke, in particular to a method for producing clean formed coke by using a water glass transition state binder.
Background
The method determines that coal combustion is a main mode for obtaining energy due to the fact that special primary energy resources rich in coal, lean oil and little gas are given, but dust, sulfur dioxide, nitrogen oxides and the like discharged by direct combustion of a large amount of coal cause serious harm to the atmospheric environment, so that the atmospheric environment is seriously polluted and haze weather frequently occurs, for example, the amount of civil scattered combustion coal is 1.6 hundred million tons and only accounts for 3.8% of the national coal amount in the 2014, the annual discharge amount of a power plant is 200 ten thousand tons in the case of sulfur dioxide discharge, the amount of civil scattered combustion is as high as 320 ten thousand tons and is 1.6 times of the total amount of the power plant, in addition, the damage to the ecological environment caused by a series of problems of smoke pollution, nitrogen oxide pollution, ash pollution and the like of the civil scattered combustion coal is beyond estimation, however, the method is very difficult to solve the problem of coal combustion in rural areas and small towns fundamentally due to the influences of factors such as regions, economy, culture and the like, it is imperative to provide these areas with high quality, low cost, clean alternative fuels.
And the power coal used as fuel mainly comprises low-rank coal, and with the improvement of the mechanization degree of coal mining, the proportion of slack coal is larger and larger in the mining process, and how to efficiently utilize the slack coal is more and more emphasized.
The clean formed coke is a clean solid fuel which is prepared by using low-rank slack coal as a main material and assisting a small amount of sulfur-fixing agent, combustion improver, binder and the like, performing and then performing dry distillation at medium temperature by using the existing semi-coke plant production equipment, and has the advantages of high forming rate, good strength, low volatilization, low sulfur emission, difficult slag bonding and the like, and tail gas can meet the national emission standard without a desulfurization facility; and the fuel is easy to ignite, strong in fire-sustaining capability, high in temperature rise speed and long in combustion duration, and is an ideal fuel for various civil life stoves.
The existing pulverized coal molding dry distillation method has few patents, for example, in the publication No. CN106635217A, coal liquefaction residues are used as cold and hot state binders of the pulverized coal molding dry distillation method and are directly mixed with pulverized coal for molding and dry distillation; in the publication No. CN106701133A, asphalt and tar residues are used as adhesives to be mixed with pulverized coal and then are subjected to dry distillation to obtain formed coke; in the publication No. CN106753496A, tar residue is used as a basic adhesive, and corn flour and inorganic magnesium salt are mixed, molded and then dry distilled; in the publication No. CN106929063A, waste heavy coal tar pitch, tar slag and polyaluminium ferric chloride are mixed, heated and softened, then added with dolomite powder to prepare a binder, and the binder is mixed with pulverized coal, then cold-pressed to form coal, and then dry-distilled to obtain formed coke. The binder used in the patent formula for preparing the formed coke mainly acts on a cold binder in a cold forming process below 200 ℃ and a hot binder in a dry distillation process above 400 ℃, but in the actual dry distillation process, the cold binder fails to work at the temperature of 200-400 ℃, and the hot binder does not act, so that the problem of high coke breakage rate in the dry distillation process is caused by lack of the use of the transition binder in the temperature range.
Through retrieval, the transition state binder of the water glass for producing the clean formed coke is not reported.
Disclosure of Invention
The invention aims to solve the specific technical problems that in the stage that the cold-state binder fails at 200-400 ℃ and the hot-state binder does not act in the dry distillation process of the binder for producing the clean formed coke, the broken rate of the formed coke in the dry distillation process is high due to the lack of the use of the transition-state binder in the temperature range, and the invention provides a method for producing the clean formed coke based on the water glass transition-state binder.
In order to achieve the above object, the present invention adopts the following technical solutions.
A method for producing clean formed coke based on a water glass transition state binder is characterized by comprising the following steps: the method for producing the clean formed coke is carried out according to the following steps:
the technical scheme includes that raw material composition of a water glass transition state binder is selected, and quality indexes of the raw material composition are water glass powder, soluble solid is not less than 95wt%, and kaolin SiO2Not less than 50wt% of silica SiO2Not less than 96wt%, pregelatinized starch: viscosity is more than or equal to 600mPa.s, limestone CaO is more than or equal to 51wt%, and coal liquefaction residue: the residual oil and the asphaltene are more than or equal to 60 wt%;
crushing kaolin, silica, limestone and coal liquefaction residues which are used as raw materials of the water glass transition state binder respectively until the granularity is less than or equal to 3 mm; water glass powder and pre-gelatinized starch for later use;
respectively weighing 5-10 parts of crushed kaolin, 5-10 parts of silica, 10-20 parts of limestone and 50-60 parts of coal liquefaction residues according to parts by weight, and further weighing 20-30 parts of water glass powder and 10-20 parts of pregelatinized starch, mixing the materials together in sequence, and stirring and mixing the materials uniformly;
fourthly, the mixture is subjected to dry grinding, so that the granularity of the raw materials is smaller than or equal to 100 meshes, and the mixture is the water glass transition state binder;
fifthly, selecting the coal as the blended coal, wherein the quality indexes are as follows: dry ashless based volatile VdafNot less than 25 percent, dry basis ash content AdLess than or equal to 15 percent, fixed carbon FC on dry basisdNot less than 55 percent of total sulfur S on a dry basist,d＜1.5%；
Sixthly, crushing the blended coal to be-3 mm, uniformly mixing the crushed blended coal with the water glass transition state binder, performing cold press molding, selecting the molding pressure to be 10-15MPa, enabling the strength of molded coal to be more than 800N/ball under the molding pressure, performing dry distillation on the prepared molded coal in a vertical dry distillation furnace at the temperature of 600 plus materials and 900 ℃, enabling the dry distillation time to be 2-4h, discharging the red hot furnace burden out of the furnace, and cooling the furnace to normal temperature through a coke quenching process to obtain the clean molded coke.
Wherein the strength index of the clean formed coke is as follows: the compressive strength is 800N/ball-2000N/ball, the forming rate is more than 80 percent, and the final rate is less than 10 percent.
In the technical scheme, the water glass, the direct coal liquefaction residue, the limestone and the starch are compounded to produce the clean formed coke, the functions of the clean formed coke are mainly represented by triple functions of a cold-state binder, a hot-state binder and a transition-state binder, the traditional formed coke binder only considers the cold-state binder, the cold-state starch binder can fail in a temperature range of 200-400 ℃ in the formed coke dry distillation process after pulverized coal molding, the transition time of the hot-state binder does not take effect, and the time is the stage at which the formed coke is most easily crushed; the innovation point of the invention is to provide a water glass transition state binder which can continuously act in a temperature range of 200-. Na and H are in a closed state of the three-dimensional structure film and are insoluble in water, and the curing temperature is raised to more than 200 ℃, so that a curing system with excellent water resistance can be obtained, and the crushing of clean formed coke caused by pressure bearing and self expansion or compression in the forming process of the formed coke at the temperature stage is avoided.
Compared with the prior art, the method for producing the clean formed coke based on the water glass transition state binder has the advantages that the raw materials adopted by the method are wide and rich in source and low in price, have the effects of the cold-hot state binder, have the bonding effect before the cold-hot state binder loses efficacy and the hot-hot state binder acts in the pyrolysis process, and ensure the forming rate of the materials in the dry distillation furnace and the strength of the formed coke.
The invention realizes the high-efficiency utilization of the low-order slack coal and improves the utilization value of the slack coal.
Detailed Description
The following further describes the embodiments of the present invention.
Example 1
The method for producing the clean formed coke based on the water glass transition state binder, which is provided by the invention, is implemented by the following specific steps:
the technical scheme includes that raw material composition of a water glass transition state binder is selected, and quality indexes of the raw material composition are water glass powder, soluble solid 99wt% and kaolin SiO250wt% silica SiO296wt% of pregelatinized starch: viscosity 1000mpa.s, limestone CaO56wt% and coal liquefaction residue: residual oil + asphaltene 80 wt%;
crushing kaolin, silica, limestone and coal liquefaction residues which are used as raw materials of the water glass transition state binder respectively until the granularity is less than or equal to 3 mm; water glass powder and pre-gelatinized starch for later use;
respectively weighing 10kg of crushed kaolin, 20kg of silica, 20kg of limestone and 50kg of coal liquefaction residues according to parts by weight, weighing 20kg of water glass powder and 10kg of pre-gelatinized starch, mixing the materials together in sequence, and stirring and mixing the materials uniformly;
fourthly, the mixture is subjected to dry grinding, so that the granularity of the raw materials is smaller than or equal to 100 meshes, and the mixture is the water glass transition state binder;
fifthly, selecting the coal as the blended coal, wherein the quality indexes are as follows: dry ashless based volatile Vdaf30.0wt%, dry basis ash content Ad13.5 wt.% dry-fixed carbon FCd59.1% by weight, total sulfur S on a dry basist,d1.46wt%；
Sixthly, crushing the mixed coal to be-3 mm, uniformly mixing the crushed mixed coal with the water glass transition state binder, performing cold press molding, selecting the molding pressure to be 15MPa, performing dry distillation on the prepared molded coal in a vertical dry distillation furnace at the temperature of 900 ℃, wherein the dry distillation time is 2h, discharging the red hot furnace burden out of the furnace, and cooling the red hot furnace burden to the normal temperature through a coke quenching process to obtain the clean type coke.
Comparative example 1
The coal charge is prepared by crushing the same blended coal to-3 mm without adding water glass transition state binder, uniformly mixing the crushed blended coal with the binder, performing cold press molding, selecting the molding pressure of 15MPa, performing dry distillation on the prepared molded coal in a vertical retort at the temperature of 900 ℃ for 2 hours, discharging the red hot furnace charge out of the furnace, and cooling to normal temperature through a coke quenching process to obtain the coke for comparison.
The compressive strength, forming rate and final rate indexes of the obtained clean formed coke and the coke for comparison were measured in a Linan Zhonglu Chang YAW-300D type strength tester and a Xinxiangchen Wei YBS-1000 type screening tester, and the test results are shown in the following table 1.
TABLE 1 comparison of compressive Strength, Molding Rate and end Rate indexes
Figure 447521DEST_PATH_IMAGE002
Example 2
The method for producing the clean formed coke based on the water glass transition state binder is implemented as follows:
the technical scheme includes that raw material composition of a water glass transition state binder is selected, and quality indexes of the raw material composition are water glass powder, 98wt% of soluble solid and kaolin SiO255wt% silica SiO296.6wt% of pregelatinized starch: viscosity 900mpa.s, limestone CaO54wt% and coal liquefaction residue: residual oil + asphaltene 75 wt%;
crushing kaolin, silica, limestone and coal liquefaction residues which are used as raw materials of the water glass transition state binder respectively until the granularity is less than or equal to 3 mm; water glass powder and pre-gelatinized starch for later use;
respectively weighing 9kg of crushed kaolin, 16kg of silica, 17.5kg of limestone and 52.5kg of coal liquefaction residues according to parts by weight, weighing 22.5kg of water glass powder and 12.5kg of pregelatinized starch, mixing the materials together in sequence, and stirring and mixing the materials uniformly;
fourthly, the mixture is subjected to dry grinding, so that the granularity of the raw materials is smaller than or equal to 100 meshes, and the mixture is the water glass transition state binder;
fifthly, selecting the coal as the blended coal, wherein the quality indexes are as follows: dry ashless based volatile Vdaf29.0wt%, dry basis ash Ad12.4 wt.% dry fixed carbon FCd61.2 wt.%, dry basis, total sulfur St,d0.97wt%；
Sixthly, crushing the blended coal to be-3 mm, uniformly mixing the crushed blended coal with the water glass transition state binder, performing cold press molding, selecting the molding pressure to be 14MPa, performing dry distillation on the prepared molded coal in a vertical dry distillation furnace at the temperature of 850 ℃ for 2.5 hours, discharging the red hot furnace burden out of the furnace, and cooling to the normal temperature through a coke quenching process to obtain the clean formed coke, wherein the weight ratio of the water glass transition state binder to the blended coal is 15: 100.
Comparative example 1
The coal charge is prepared by crushing the same blended coal to-3 mm without adding water glass transition state binder, uniformly mixing the crushed blended coal with the binder, performing cold press molding, selecting the molding pressure to be 14MPa, performing dry distillation on the prepared molded coal in a vertical retort at the temperature of 850 ℃, wherein the dry distillation time is 2.5h, discharging the red hot furnace charge out of the furnace, and cooling to normal temperature through a coke quenching process to obtain the control coke.
The compressive strength, forming rate and end rate indexes of the obtained clean formed coke and the coke for comparison were measured in a Linan Zhonglu Chang YAW-300D type strength tester and a Xinxiangchen Wei YBS-1000 type screening tester, and the test results are shown in the following table 2.
TABLE 2 comparison of compressive Strength, Molding Rate and end Rate indexes
Sample (I) Compressive strength (N/ball) Percent formation rate% End rate/%)
Contrast coke 760 73.2 16.8
Clean formed coke added with transition state binder 920 82.5 9.1
Example 3
The method for producing the clean formed coke based on the water glass transition state binder is implemented as follows:
the technical scheme includes that raw material composition of a water glass transition state binder is selected, and quality indexes of the raw material composition are water glass powder, 97wt% of soluble solid and kaolin SiO260wt% silica SiO297.2wt% and pregelatinized starch: viscosity 800mpa.s, limestone CaO53wt% and coal liquefaction residue: residual oil + asphaltene 70 wt%;
crushing kaolin, silica, limestone and coal liquefaction residues which are used as raw materials of the water glass transition state binder respectively until the granularity is less than or equal to 3 mm; water glass powder and pre-gelatinized starch for later use;
respectively weighing 8kg of crushed kaolin, 12kg of silica, 15kg of limestone and 55kg of coal liquefaction residues according to parts by weight, weighing 25kg of water glass powder and 15kg of pre-gelatinized starch, mixing the materials together in sequence, and stirring and mixing the materials uniformly;
fourthly, the mixture is subjected to dry grinding, so that the granularity of the raw materials is smaller than or equal to 100 meshes, and the mixture is the water glass transition state binder;
fifthly, selecting the coal as the blended coal, wherein the quality indexes are as follows: dry ashless based volatile Vdaf32.0wt%, dry basis ash Ad11.7wt%, fixed carbon FC on a dry basisd59.2% by weight, total sulfur S on a dry basist,d0.84wt%；
Sixthly, crushing the mixed coal to be-3 mm, uniformly mixing the crushed mixed coal with the water glass transition state binder, performing cold press molding, selecting the molding pressure to be 13MPa, performing dry distillation on the prepared molded coal in a vertical dry distillation furnace at the temperature of 800 ℃, performing dry distillation for 3 hours, discharging the red hot furnace burden, and cooling to the normal temperature through a coke quenching process to obtain the clean type coke, wherein the weight ratio of the water glass transition state binder to the mixed coal is 20: 100.
Comparative example 3
The coal charge is prepared by crushing the same blended coal to-3 mm without adding water glass transition state binder, uniformly mixing the crushed blended coal with the binder, performing cold press molding, selecting the molding pressure to be 13MPa, performing dry distillation on the prepared molded coal in a vertical retort at the temperature of 800 ℃, wherein the dry distillation time is 3h, discharging the red hot furnace charge out of the furnace, and cooling to normal temperature through a coke quenching process to obtain the coke for comparison.
The compressive strength, forming rate and end rate indexes of the obtained clean formed coke and the coke for comparison were measured in a Linan Zhonglu Chang YAW-300D type strength tester and a Xinxiangchen Wei YBS-1000 type screening tester, and the test results are shown in the following Table 3.
TABLE 3 comparison of compressive Strength, Molding Rate and end Rate indexes
Sample (I) Compressive strength (N/ball) Percent formation rate% End rate/%)
Contrast coke 840 76.3 15.1
Clean formed coke added with transition state binder 1180 89.1 7.8
Example 4
The method for producing the clean formed coke based on the water glass transition state binder is implemented as follows:
the technical scheme includes that raw material composition of a water glass transition state binder is selected, and quality indexes of the raw material composition are water glass powder, 96wt% of soluble solid and kaolin SiO265wt% silica SiO297.8wt% of pregelatinized starch: viscosity 700mpa.s, limestone CaO52wt% and coal liquefaction residue: residual oil + asphaltenes 65 wt%;
crushing kaolin, silica, limestone and coal liquefaction residues which are used as raw materials of the water glass transition state binder respectively until the granularity is less than or equal to 3 mm; water glass powder and pre-gelatinized starch for later use;
respectively weighing 7kg of crushed kaolin, 8kg of silica, 12.5kg of limestone and 57.5kg of coal liquefaction residues according to parts by weight, weighing 27.5kg of water glass powder and 17.5kg of pregelatinized starch, mixing the materials together in sequence, and stirring and mixing the materials uniformly;
fourthly, the mixture is subjected to dry grinding, so that the granularity of the raw materials is smaller than or equal to 100 meshes, and the mixture is the water glass transition state binder;
fifthly, selecting the coal as the blended coal, wherein the quality indexes are as follows: dry ashless based volatile Vdaf25.0wt%, dry basis ash Ad14.1 wt.%, fixed carbon FC on a dry basisd63.2 wt.%, dry basis, total sulfur St,d1.23wt%；
Sixthly, crushing the mixed coal to be-3 mm, uniformly mixing the crushed mixed coal with the water glass transition state binder, performing cold press molding, selecting the molding pressure to be 12MPa, performing dry distillation on the prepared molded coal in a vertical dry distillation furnace at the temperature of 700 ℃, wherein the dry distillation time is 3.5 hours, discharging the red hot furnace burden out of the furnace, and cooling to the normal temperature through a coke quenching process to obtain the clean formed coke.
Comparative example 4
The coal charge is prepared by crushing the same blended coal to-3 mm without adding water glass transition state binder, uniformly mixing the crushed blended coal with the binder, performing cold press molding, selecting the molding pressure to be 12MPa, performing dry distillation on the prepared molded coal in a vertical retort at the temperature of 700 ℃, wherein the dry distillation time is 3.5h, discharging the red hot furnace charge out of the furnace, and cooling to normal temperature through a coke quenching process to obtain the control coke.
The compressive strength, forming rate and end rate indexes of the obtained clean formed coke and the coke for comparison were measured in a Linan Zhonglu Chang YAW-300D type strength tester and a Xinxiangchen Wei YBS-1000 type screening tester, and the test results are shown in the following table 4.
TABLE 4 comparison of compressive Strength, Molding Rate and end Rate indexes
Sample (I) Compressive strength (N/ball) Percent formation rate% End rate/%)
Contrast coke 830 75.6 15.8
Clean formed coke added with transition state binder 1105 87.7 8.1
Example 5
The method for producing the clean formed coke based on the water glass transition state binder is implemented as follows:
the technical scheme includes that raw material composition of a water glass transition state binder is selected, and quality indexes of the raw material composition are water glass powder, 95wt% of soluble solid and kaolin SiO270wt% silica SiO298.5wt%, pregelatinized starch: viscosity 600mpa.s, limestone CaO51wt% and coal liquefaction residue: 60wt% of residual oil and asphaltene;
crushing kaolin, silica, limestone and coal liquefaction residues which are used as raw materials of the water glass transition state binder respectively until the granularity is less than or equal to 3 mm; water glass powder and pre-gelatinized starch for later use;
respectively weighing 5kg of crushed kaolin, 5kg of silica, 10kg of limestone and 60kg of coal liquefaction residues according to parts by weight, and further weighing 30kg of water glass powder and 20kg of pre-gelatinized starch, mixing the materials together in sequence, and stirring and mixing the materials uniformly;
fourthly, the mixture is subjected to dry grinding, so that the granularity of the raw materials is smaller than or equal to 100 meshes, and the mixture is the water glass transition state binder;
fifthly, selecting the coal as the blended coal, wherein the quality indexes are as follows: dry ashless based volatile Vdaf34.0wt%, dry basis ash Ad15.0 wt.%, dry basis fixed carbon FCd55.4 wt.%, dry basis, total sulfur St,d0.70wt%；
Sixthly, crushing the mixed coal to be-3 mm, uniformly mixing the crushed mixed coal with the water glass transition state binder, performing cold press molding, selecting the molding pressure to be 10MPa, performing dry distillation on the prepared molded coal in a vertical dry distillation furnace at the temperature of 600 ℃, wherein the dry distillation time is 4h, discharging the red hot furnace burden out of the furnace, and cooling the red hot furnace burden to the normal temperature through a coke quenching process to obtain the clean type coke, wherein the weight ratio of the water glass transition state binder to the mixed coal is 30: 100.
Comparative example 5
The coal charge is prepared by crushing the same blended coal to-3 mm without adding water glass transition state binder, uniformly mixing the crushed blended coal with the binder, performing cold press molding, selecting the molding pressure of 10MPa, performing dry distillation on the prepared molded coal in a vertical retort at the temperature of 600 ℃ for 4 hours, discharging the red hot furnace charge out of the furnace, and cooling to normal temperature through a coke quenching process to obtain the coke for comparison.
The compressive strength, forming rate and end rate indexes of the obtained clean formed coke and the coke for comparison were measured in a Linan Zhonglu Chang YAW-300D type strength tester and a Xinxiangchen Wei YBS-1000 type screening tester, and the test results are shown in the following Table 5.
TABLE 5 comparison of compressive Strength, Molding Rate and end Rate indexes
Sample (I) Compressive strength (N/ball) ＞30mm ＜10mm
Contrast coke 810 75.1 15.5
Clean formed coke added with transition state binder 1052 85.6 8.6

Claims (2)

1. A method for producing clean formed coke based on a water glass transition state binder, wherein the transition state binder acts in a temperature range of 200 ℃ to 400 ℃, and is characterized in that: the method for producing the clean formed coke is carried out according to the following steps:
the technical scheme includes that raw material composition of a water glass transition state binder is selected, and quality indexes of the raw material composition are water glass powder, soluble solid is not less than 95wt%, and kaolin SiO2Not less than 50wt% of silica SiO2Not less than 96wt%, pregelatinized starch: viscosity is more than or equal to 600mPa.s, limestone CaO is more than or equal to 51wt%, and coal liquefaction residue: the residual oil and the asphaltene are more than or equal to 60 wt%;
crushing kaolin, silica, limestone and coal liquefaction residues serving as raw materials of the water glass transition state binder respectively until the granularity is less than or equal to 3mm, and reserving water glass powder and pregelatinized starch for later use;
respectively weighing 5-10 parts of crushed kaolin, 5-10 parts of silica, 10-20 parts of limestone and 50-60 parts of coal liquefaction residues according to parts by weight, and further weighing 20-30 parts of water glass powder and 10-20 parts of pregelatinized starch, mixing the materials together in sequence, and stirring and mixing the materials uniformly;
fourthly, the mixture is subjected to dry grinding, so that the granularity of the raw materials is smaller than or equal to 100 meshes, and the mixture is the water glass transition state binder;
fifthly, selecting the coal as the blended coal, wherein the quality indexes are as follows: dry ashless based volatile VdafNot less than 25 percent, dry basis ash content AdLess than or equal to 15 percent, fixed carbon FC on dry basisdNot less than 55 percent of total sulfur S on a dry basist,d＜1.5%；
Sixthly, the weight ratio of the water glass transition state binder to the blended coal is 10-30: 100, the blended coal is crushed to 3mm and then is uniformly mixed with the water glass transition state binder, the mixture is subjected to cold press molding, the molding pressure is 10-15MPa, the strength of the molded coal meets the requirement of being more than 800N/ball under the molding pressure, the prepared molded coal is subjected to dry distillation in a vertical dry distillation furnace at the temperature of 600 plus materials and 900 ℃, the dry distillation time is 2-4h, and then the red hot furnace burden is discharged from the furnace and cooled to the normal temperature through a coke quenching process, so that the clean molded coke is obtained.
2. The method for producing clean formed coke based on water glass transition state binder as claimed in claim 1, characterized in that: the strength index of the clean formed coke is as follows: the compressive strength is 800N/ball-2000N/ball, the forming rate is more than 80 percent, and the final rate is less than 10 percent.
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CN111363599A (en) * 2020-04-15 2020-07-03 宁夏中润工贸有限公司 Novel formed coke adhesive and method for preparing formed coke by using same
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