阅读说明：本技术 一种基于焦粉的炊暖两用清洁型煤及其制备方法 (Coke powder-based clean briquette for cooking and heating and preparation method thereof ) 是由 刘海玉 吴昊 金燕 樊保国 乔晓磊 贾里 于 2021-06-18 设计创作，主要内容包括：一种基于焦粉的炊暖两用清洁型煤及其制备方法,属于民用型煤生产技术领域,可解决现有的型煤制造成本高,发热量低,燃烧产物污染严重等问题,该方法包括以下步骤：将焦粉、粘结剂、固硫剂、改性生物质送入料仓进行计量,接着按照原料既定配比将将原料送入一级搅拌系统,在一级搅拌系统内充分搅拌后,依据既定配方向已搅拌的原料中加入水,送入二级搅拌系统,在二级搅拌系统中最终调整搅拌料水分含量,随后冲压成型,生产出生型煤；生型煤经过干燥养护后制成合格品。本产品一方面可以提高焦粉的再利用率,另一方面可有助于解决农村地区秸秆资源废弃问题。提高了优质燃料资源回收利用率,减少环境污染及破坏。(A cooking and heating dual-purpose clean coal briquette based on coke powder and a preparation method thereof belong to the technical field of civil coal briquette production, and can solve the problems of high manufacturing cost, low heat productivity, serious pollution of combustion products and the like of the existing coal briquette, and the method comprises the following steps: feeding coke powder, a binder, a sulfur-fixing agent and modified biomass into a storage bin for metering, then feeding the raw materials into a primary stirring system according to a set proportion of the raw materials, fully stirring in the primary stirring system, adding water into the stirred raw materials according to a set proportion direction, feeding the mixture into a secondary stirring system, finally adjusting the moisture content of the stirred materials in the secondary stirring system, and then performing punch forming to produce the briquette; the raw briquette is dried and cured to be made into qualified products. The product can improve the reutilization rate of the coke powder on one hand, and can help to solve the waste problem of straw resources in rural areas on the other hand. The recycling rate of high-quality fuel resources is improved, and environmental pollution and damage are reduced.)

1. The utility model provides a dual-purpose clean moulded coal of cooking and heating based on burnt powder which characterized in that: the coke powder comprises the following components in percentage by mass: adhesive: a sulfur-fixing agent: the ratio of the modified biomass particles is 70-90: 3-5: 1.5-2.5: 10-30.

2. The coke powder-based clean coal for cooking and heating as claimed in claim 1, which is characterized in that: the binder is a mixture of cement and magnesium slag in a mass ratio of 1: 3.

3. The coke powder-based clean coal for cooking and heating as claimed in claim 1, which is characterized in that: the sulfur-fixing agent comprises limestone powder.

4. The coke powder-based clean coal for cooking and heating as claimed in claim 1, which is characterized in that: the modified biomass particles comprise wheat or rice straw particles modified by 0.5-5% by mass of sodium hydroxide solution, the wheat or rice straw particles are poured into the sodium hydroxide solution with the concentration, and the particles are heated in a water bath at 80 ℃ for 2 hours under normal pressure, wherein the particle size is 1-3 mm.

5. A method for preparing the coke powder-based clean coal for cooking and heating according to any one of claims 1 to 4, which is characterized in that: the method comprises the following steps:

firstly, conveying coke powder, a binder, a sulfur-fixing agent and modified biomass particles into a storage bin for metering;

secondly, after proportioning according to a preset production formula, feeding the mixture into a primary stirring system, wherein the rotating speed of a stirring head is 210r/min, the stirring time is 1min, and after uniformly stirring, feeding the mixture into a mixing bin;

thirdly, feeding the stirred material discharged from the mixing bin into a secondary stirring system, adding water according to production requirements, wherein the water addition amount is 10-20% of the mass sum of the coke powder and the modified biomass particles in the raw materials fed into the bin, the stirring speed is 210r/min, the stirring time is 3min, and after the stirring is finished, performing punch forming to obtain raw molded coal;

and fourthly, drying and curing the green coal, and cooling to obtain a finished product of the cooking and heating dual-purpose coal based on the coke powder.

6. The preparation method of the coke powder-based clean coal for both cooking and heating as claimed in claim 5, characterized in that: and in the third step, the stamping forming pressure is 11-30 MPa.

7. The preparation method of the coke powder-based clean coal for both cooking and heating as claimed in claim 5, characterized in that: in the fourth step, the drying temperature is 100-120 ℃, and the drying time is 1-2 h.

Technical Field

The invention belongs to the technical field of civil coal briquette production, and particularly relates to a cooking and heating dual-purpose clean coal briquette based on coke powder and a preparation method thereof.

Background

China is a country with abundant coal resource reserves and is also the world with the most coal consumption. In 2019, the yield of coal in China exceeds 37.46 hundred million tons, the quantity of imported coal is 3 hundred million tons, and the yield, the import quantity and the consumption are all first in the world. Because the usage scenes of coal in China are complex and changeable, a large amount of coal is combusted to cause serious air pollution, and particularly in the civil field, the efficient and clean utilization of the coal is difficult to realize for a long time, and a large amount of air pollutants are released by the combustion of civil scattered coal every heating season. Therefore, the use of low-pollution clean energy is urgently needed in China, and the air pollution caused by coal can be greatly relieved by using clean coal manufactured by coke powder, semi coke powder, inferior coal and low-quality derivatives thereof as fuel. The briquette technology is one of clean coal technologies, has the characteristics of less investment, quick response and low cost compared with other coal technologies, and the product can be widely applied to northern areas of China.

Disclosure of Invention

The invention provides a cooking and heating dual-purpose clean coal based on coke powder and a preparation method thereof, aiming at the problems of high manufacturing cost, low heat productivity, serious pollution of combustion products and the like of the existing coal.

The invention adopts the following technical scheme:

a cooking and heating dual-purpose clean coal briquette based on coke powder comprises the following components in percentage by mass: coke powder: adhesive: a sulfur-fixing agent: the ratio of the modified biomass particles is 14-16:2-3:1-2: 4-6.

Further, the binder is a mixture of cement and magnesium slag in a mass ratio of 1: 3.

Further, the sulfur fixing agent comprises limestone powder.

Further, the modified biomass particles comprise wheat or rice straw particles modified by 0.5-5% by mass of sodium hydroxide solution, the wheat or rice straw particles are poured into the sodium hydroxide solution with the concentration, and the mixture is heated in a water bath at 80 ℃ for 2 hours under the normal pressure condition, wherein the particle size is 1-3 mm.

A preparation method of a coke powder-based clean briquette for cooking and heating comprises the following steps:

firstly, conveying coke powder, a binder, a sulfur-fixing agent and modified biomass particles into a storage bin for metering;

secondly, after proportioning according to a preset production formula, feeding the mixture into a primary stirring system, wherein the rotating speed of a stirring head is 210r/min, the stirring time is 1min, and after uniformly stirring, feeding the mixture into a mixing bin;

thirdly, feeding the stirred material sent out from the mixing bin into a secondary stirring system, adding water according to production requirements, wherein the water addition amount is less than 20% of the total mass of the raw materials fed into the mixing bin, the stirring speed is 210r/min, the stirring time is 3min, and after the stirring is finished, performing punch forming to obtain raw molded coal;

and fourthly, drying and curing the green coal, and cooling to obtain a finished product of the cooking and heating dual-purpose coal based on the coke powder.

Further, the stamping forming pressure in the third step is 11-30 MPa.

Further, the drying temperature in the fourth step is 100-120 ℃, and the drying time is 1-2 h.

The unqualified raw coal which is failed to be molded after being stamped enters a secondary stirring system, and a damaged unqualified cooking and heating dual-purpose coal finished product is fed into the primary stirring system as a raw material for producing the raw coal after being maintained.

The liquid containing coke powder, binder, sulfur fixing agent and modified biomass powder extruded in the punch forming process can be used for the biomass particle modification process again.

Coke powder is a by-product produced in the production of industrial coke and is usually disposed of as waste. The coke powder has the characteristics of high carbon content, low volatile component and large combustion heat value. Therefore, the coke powder is used for manufacturing the briquette, the cost of the briquette can be effectively reduced, and the defect of low heat productivity of the briquette is overcome.

The briquette coal binder has various types and has great influence on the physical property and the combustion property of the briquette coal. At present, inorganic binder such as cement is widely used, the price is low, and the mechanical strength of the molded coal can be effectively enhanced after the molded coal is used. The coke powder is used as industrial coke byproduct, has high carbon content, contains less volatile components and is difficult to ignite.

The sulfur-fixing agent for briquette is used for fixing sulfur in the combustion process of briquette, and sulfur generated by combustion reacts with the sulfur-fixing agent and is fixed in the form of sulfate.

The modified biomass used in the production of the briquette can play a role in binding coke powder and improve the mechanical strength of the briquette; on the other hand, the volatile component content of the briquette can be improved, and the burning point of the briquette is reduced, so that the briquette is easier to burn.

The invention has the following beneficial effects:

the invention provides a manufacturing technology of a coke powder-based clean briquette for cooking and heating, which is used for manufacturing the briquette by taking the coke powder as a main raw material and adding a binder and a sulfur-fixing agent. The raw materials are proportioned according to the production formula, the mixture is uniformly stirred and then is subjected to punch forming, the raw coal is dried and cured at high temperature, and the cooled coal is the finished product of the clean coal for cooking and heating. The clean coal briquette for cooking and heating based on the coke powder manufactured by the production method can be used as an efficient cheap clean fuel to replace the existing coal briquette product with high pollutant emission and low heat value.

Compared with the existing products, the product has the advantages of high heat productivity, good wear resistance, pressure resistance and drop resistance, less combustion pollutants, relatively low raw material price and the like. The raw material adopted by the product is broken coke carbon powder generated in the production process of industrial formed coke. The coke powder is usually stored in an open-air accumulation mode, and seriously pollutes natural resources such as soil, underground water and the like. The binder adopted by the product is a mixture of cement and magnesium slag, the cement has the advantages of large amount, easy obtaining, low unit price, strong cohesiveness and good mechanical property after drying, and the magnesium slag is a waste in the magnesium industry and cannot be utilized for a long time. The modified biomass adopted by the product is modified wheat straw, corn straw or rice straw. A large amount of crop straws are produced in China every year, and can be used as a briquette raw material after being modified by a sodium hydroxide solution, so that the advantages of low price, easy obtainment and high volatile content of the straws are fully utilized.

Drawings

FIG. 1 is a flow chart of the preparation method of the present invention.

Detailed Description

Example 1

A coke powder-based clean briquette for cooking and heating uses coke powder as a main raw material, and is produced by using a binder, a sulfur-fixing agent and modified biomass, and comprises the following steps:

1. and (3) conveying the coke powder, the binder and the modified biomass into a storage bin for metering.

2. The coke powder, the binder, the sulfur-fixing agent and the modified biomass are mixed according to a preset production formula, wherein the coke powder (85) comprises the following components in percentage by mass: binder (4): sulfur-fixing agent (1.5): modified biomass particles (15).

3. Feeding the raw materials which are proportioned into a primary stirring system, uniformly stirring, and feeding the stirred materials into a mixing bin;

4. and after the stirring materials sent out from the mixing bin enter a secondary stirring system, adding water into the stirred raw materials according to the set mixing direction. Taking the sum of the mass of the coke powder and the biomass as a reference, adding water with the mass not more than 18 percent of the mass, fully stirring again, and if necessary, adjusting the water content of the stirring material. Then punch forming to produce the briquette. The liquid containing coke powder, binder, sulfur fixing agent and modified biomass powder extruded in the punch forming process can be used for the biomass particle modification process again;

the selected forming pressure is 20-30 MPa;

sending unqualified raw coal products into a secondary stirring system;

and feeding the molded green coal into a drying curing workshop for curing, wherein the drying curing temperature is 100-120 ℃, and cooling to prepare a finished product of the coke powder-based clean coal for cooking and heating.

And crushing the unqualified products generated after drying and maintenance, and then sending the crushed unqualified products into a primary stirring system.

The coke powder-based clean coal for cooking and heating produced by the method stated in the embodiment has better performance, and the specific performances are as follows:

compressive strength	850N/each
		Drop strength	85%
Heat strength	390N/number
		Low calorific value	23.58MJ/kg
Volatile component	11.47%

Example 2

A coke powder-based clean briquette for cooking and heating uses coke powder as a main raw material, and is produced by using a binder, a sulfur-fixing agent and modified biomass, and comprises the following steps:

1. and (3) conveying the coke powder, the binder and the modified biomass into a storage bin for metering.

2. The coke powder, the binder, the sulfur-fixing agent and the modified biomass are mixed according to a preset production formula, wherein the coke powder (85) comprises the following components in percentage by mass: binder (4): sulfur-fixing agent (2): modified biomass particles (15).

3. Feeding the raw materials which are proportioned into a primary stirring system, uniformly stirring, and feeding the stirred materials into a mixing bin;

4. and after the stirring materials sent out from the mixing bin enter a secondary stirring system, adding water into the stirred raw materials according to the set mixing direction. Taking the sum of the mass of the coke powder and the biomass as a reference, adding water with the mass of more than 15 percent of the mass, fully stirring again, if necessary, adjusting the water content of a stirring material, performing punch forming to produce the green briquette, extruding liquid containing the coke powder, a binder, a sulfur fixing agent and modified biomass powder in the punch forming process, and reusing the liquid in the biomass particle modification process;

the selected forming pressure is 11-25 MPa;

sending unqualified raw coal products into a secondary stirring system;

and feeding the molded green coal into a drying curing workshop for curing, wherein the drying curing temperature is 100-120 ℃, and cooling to prepare a finished product of the coke powder-based clean coal for cooking and heating.

And crushing the unqualified products generated after drying and maintenance, and then sending the crushed unqualified products into a primary stirring system.

The coke powder-based clean coal for cooking and heating produced by the method stated in the embodiment has better performance, and the specific performances are as follows:

compressive strength	897N/one
		Drop strength	87%
Heat strength	395N/each
		Low calorific value	23.47MJ/kg
Volatile component	11.41%

Example 3

A coke powder-based clean briquette for cooking and heating uses coke powder as a main raw material, and is produced by using a binder, a sulfur-fixing agent and modified biomass, and comprises the following steps:

1. and (3) conveying the coke powder, the binder and the modified biomass into a storage bin for metering.

2. The coke powder, the binder, the sulfur-fixing agent and the modified biomass are mixed according to a preset production formula, wherein the coke powder (80): binder (5): sulfur-fixing agent (2.5): modified biomass particles (20).

3. Feeding the raw materials which are proportioned into a primary stirring system, uniformly stirring, and feeding the stirred materials into a mixing bin;

4. and after the stirring materials sent out from the mixing bin enter a secondary stirring system, adding water into the stirred raw materials according to the set mixing direction. Taking the sum of the mass of the coke powder and the biomass as a reference, adding water with the mass of more than 12 percent of the mass, fully stirring again, if necessary, adjusting the water content of a stirring material, performing punch forming to produce the green briquette, extruding liquid containing the coke powder, a binder, a sulfur fixing agent and modified biomass powder in the punch forming process, and reusing the liquid in the biomass particle modification process;

the selected forming pressure is 11-25 MPa;

sending unqualified raw coal products into a secondary stirring system;

and feeding the molded green coal into a drying curing workshop for curing, wherein the drying curing temperature is 100-120 ℃, and cooling to prepare a finished product of the coke powder-based clean coal for cooking and heating.

And crushing the unqualified products generated after drying and maintenance, and then sending the crushed unqualified products into a primary stirring system.

The coke powder-based clean coal for cooking and heating produced by the method stated in the embodiment has better performance, and the specific performances are as follows:

compressive strength	2000N/one
		Drop strength	87.6%
Heat strength	399N/number
		Low calorific value	22.63MJ/kg
Volatile component	14.37%