CN106701246A - Method for producing clean biomass briquettes - Google Patents

Abstract

A method for producing clean biomass briquettes, which is characterized by comprising the following steps: crushing raw coal to a certain particle size range, and crushing biomass materials to a certain particle size range. The pulverized biomass raw material is added to a certain concentration of alkali solution, heated to a certain temperature and kept for a certain period of time, and the mixed solution formed after treatment forms a mixed binder. Mix the mixed binder with the pulverized raw coal and desulfurization and desulfurization agent evenly, use the abrasive tool to press the above-mentioned raw material mixture under a certain molding pressure, and the molded coal is degrinded and dried to obtain a biomass briquette product . The advantages and beneficial effects of the present invention are: using waste biomass materials and coal as raw materials, clean biomass briquettes are produced without adding binders, the production process is feasible, the operation is simple, no waste is generated, and the production Biomass briquettes have high combustion efficiency and low pollution emissions, which are convenient for popularization and application.

Description

A kind of production method of clean biomass briquette

technical field

The invention relates to the application field of clean coal, in particular to a production method of clean biomass briquettes.

Background technique

Since 2010, my country's energy consumption has ranked first in the world. In my country's energy structure, coal production and consumption account for as much as 75% of primary energy, so my country is the world's largest coal producer and consumer. The massive consumption of coal has led to a series of serious environmental problems. A large number of studies have confirmed that coal burning is one of the main sources of pollution that causes severe smog in northern my country, especially in the Beijing-Tianjin-Hebei region. However, the characteristics of my country's resources determine that for a long period of time in the future, the sustainable development of my country's economy will still depend on the massive consumption of coal. In addition, it is foreseeable that as high-quality coal is gradually exhausted, low-degree bituminous coal and lignite will be mined and used in large quantities, which will bring enormous pressure to the atmospheric environment. Therefore, improving coal utilization efficiency and minimizing the pollution emitted during coal use has become an urgent technical problem to be overcome. The production, development, popularization and application of clean coal are of vital strategic significance for supporting sustainable economic and social development and protecting the environment.

my country is also a large agricultural country. Agricultural production produces a large amount of biomass solid waste every year, forming a common social problem. Around 2010, some direct burning of straw produced serious air pollution problems. In recent years, various places have implemented a strict policy of prohibiting the burning of straw, but how to effectively treat and dispose of straw-like solid waste is still an unresolved problem. Severe ground and surface water pollution. In fact, straw has been the most important fuel in the long history of mankind. In Switzerland, which is rich in forest resources, a large amount of forestry waste is processed into biomass solid briquette fuel, which provides a considerable amount of energy supply. Therefore, according to the characteristics of straw resources in our country, it is of great theoretical and practical significance to rediscover the value of straw as fuel.

In recent years, extensive research has been carried out around the co-combustion of biomass and coal for power generation at home and abroad, and some valuable utilization methods have been proposed. However, the low density of straw determines that its energy density is also low, and its collection, transportation and storage will bring greater costs. Direct use of traditional coal-fired boilers for mixed combustion of straw and coal can easily lead to equipment blockage, and the transformation and upgrading of combustion boilers will also lead to additional cost increases. Using coal and biomass as raw materials to prepare biomass briquettes is an effective solution to the above problems. First of all, straw can act as a binder, reducing the use of other binders and their shortcomings. At the same time, it can also reduce the ignition point and improve the ease of use of biomass briquettes. On the other hand, through compression molding, the energy density of the fuel is greatly improved, which is convenient for transportation and storage. On this basis, by using appropriate desulfurizers and denitrification agents, the pollution emissions during its use can be greatly reduced and the cleanliness of fuel can be improved. Patent CN103666617A discloses a method for preparing low-sulfur industrial briquettes by using bagasse powder and raw coal. The method improves the cohesiveness of biomass by soaking in sodium hydroxide solution. However, this type of method requires washing and drying of the biomass, which increases additional costs, and produces alkaline waste liquid.

Contents of the invention

The purpose of the present invention is to solve the problems of low utilization efficiency of coal and biomass, easy to produce environmental pollution, etc., and overcome the shortcomings of complex biomass coal production technology, difficult processing, high cost, and easy to produce secondary pollution, and provide a The method for producing clean biomass briquettes by using biomass and coal as raw materials comprises the following production steps:

Coal is crushed to a certain particle size range, and biomass material is crushed to a certain particle size range. The pulverized biomass raw material is added to a certain concentration of alkali solution, heated to a certain temperature and maintained for a certain period of time, and the mixed solution formed after treatment is directly used as a mixed binder. Mix the mixed binder with the pulverized raw coal and the desulfurization and desulfurization agent evenly, use the mold to press the above-mentioned raw material mixture under a certain molding pressure, mold the molded coal, and dry it to obtain a biomass briquette product.

Biomass refers to non-edible lignocellulosic biomass materials mainly composed of cellulose, hemicellulose and lignin.

Wherein, the biomass mainly includes forestry waste, biomass stalks and seed shells, residues produced in the process of biodiesel preparation, and other biomass-like solid wastes that generate a large amount. Preferably, the biomass mainly uses waste wood chips from forestry processing, bran and chaff from agricultural product processing and other easily collected biomass materials. Raw coal includes sorted coal raw materials, coal slime and coal gangue with a certain calorific value, preferably. The alkali solution mainly includes sodium hydroxide solution, calcium hydroxide solution, calcium acetate solution and a mixed solution composed of sodium hydroxide, calcium hydroxide and calcium acetate solution.

Wherein, the pulverized particle size of the biomass raw material and raw coal is less than 10mm, more preferably, the particle size is less than 5mm, most preferably less than 1mm.

Among them, the alkali solution mass fraction used in the production of the binder is 0.5-30% sodium hydroxide solution, the heating temperature is 50-150°C, the heating time is 0.5-10h, and the mass ratio of biomass to alkali solution is 1-20 : 100, heating temperature 70-130 ℃, heating time 1-5h, more preferably 5-20% sodium hydroxide solution, the mass ratio of biomass and alkali solution is 3-7:100, most preferably 2% Sodium hydroxide solution, the mass ratio of biomass to alkali solution is 10:100, 80-95°C, heating time 1.5-2.5h.

Wherein, the mass ratio of the caking liquid to raw coal is 5-80:100, and the mass ratio of the caking liquid to raw coal is 20-40:100.

Wherein, the molding pressure is 8-35Mpa, more preferably 10-20Mpa.

The advantages and beneficial effects of the present invention are: using waste biomass materials and coal as raw materials, clean biomass briquettes are produced without adding binders, the production process is feasible, the operation is simple, no waste is generated, and the production Biomass briquettes have high combustion efficiency and low pollution emissions, which are convenient for popularization and application.

detailed description

The present invention is further described in detail through the following examples, but the technical content described in this example is illustrative rather than limiting, and should not limit the protection scope of the present invention accordingly.

Example 1:

A method for producing clean biomass briquettes, comprising the following steps:

The biomass is chaff, which is crushed to a particle size of less than 1 mm. The raw coal is coal produced in Datong, crushed to a particle size of less than 1mm. The chaff and 2% sodium hydroxide solution were mixed evenly according to the mass ratio of 4:100, and heated to 90°C for 2 hours to obtain a binder. The above-mentioned caking liquid and raw coal are mixed and stirred evenly according to the mass ratio of 30:100, and pressed and molded under a molding pressure of 18Mpa to produce a biomass briquette product. The prepared briquette product has been analyzed and tested, with a calorific value of 22.1MJ/kg, a compressive strength of 40N/cm ² , a sulfur fixation rate of 63%, and a dust removal rate of 75%.

Example 2:

A method for producing clean biomass briquettes, comprising the following steps:

The biomass is bran, which is crushed to a particle size of less than 1 mm. The raw coal is coal produced in Datong, crushed to a particle size of less than 1mm. The chaff and the sodium hydroxide solution with a mass fraction of 1.5% were uniformly mixed according to the mass ratio of 4:100, and heated to 90°C for 1.5h to obtain a binder. The above-mentioned caking liquid and raw coal are mixed and stirred evenly according to the mass ratio of 30:100, and pressed and molded under a molding pressure of 20Mpa to produce a biomass briquette product. The prepared briquette product has been analyzed and tested, and the calorific value is 24MJ/kg, the compressive strength is 37N/cm ² , the sulfur fixation rate is 59%, and the smoke and dust removal rate is 72%.

Example 3:

A method for producing clean biomass briquettes, comprising the following steps:

Biomass is waste sawdust, crushed to a particle size of less than 1mm. The raw coal is coal produced in Datong, crushed to a particle size of less than 1mm. The chaff and the sodium hydroxide solution with a mass fraction of 2.5% were uniformly mixed according to the mass ratio of 4:100, and heated to 90°C for 2 hours to obtain a binder. The above-mentioned caking liquid and raw coal are mixed and stirred evenly according to the mass ratio of 30:100, and pressed and molded under a molding pressure of 18Mpa to produce a biomass briquette product. The prepared briquette product has been analyzed and tested, and the calorific value is 26MJ/kg, the compressive strength is 40N/cm ² , the sulfur fixation rate is 65%, and the smoke and dust removal rate is 78%.

Claims (3)

1. a kind of production method of clean biometric matter moulded coal, it is characterised in that comprise the following steps：

Raw coal is crushed to certain particle size scope, and biological material is crushed to certain particle size scope.By the biology after crushing Matter raw material is added in certain density aqueous slkali, is heated to uniform temperature and is kept for the regular hour, and what is formed after treatment is mixed Close liquid and form hybrid adhesive.Hybrid adhesive is well mixed with the raw coal by crushing, out of stock dose of desulfurization, will using grinding tool It is press-formed under the certain briquetting pressure of above-mentioned raw mixture, the de- mill of the moulded coal after shaping obtains biomass type after drying Product of coal.

2. a kind of method of the production of clean biometric matter moulded coal according to claim 1, it is characterised in that：Biomass used Raw material and raw coal grinding particle size are less than 10mm, it is further preferred that granularity is less than 5mm, most preferably less than 1mm.

3. a kind of method of the production of clean biometric matter moulded coal according to claim 1, it is characterised in that：During production binding agent The sodium hydroxide solution of aqueous slkali mass fraction 0.5-30% used, 50-150 DEG C of heating-up temperature, the heat time is 0.5-10h, Biomass are 1-20 with the mass ratio of aqueous slkali:100,70-130 DEG C of heating-up temperature, more preferably heat time 1-5h, 5- 20% sodium hydroxide solution, biomass are 3-7 with the mass ratio of aqueous slkali:100, most preferably 2% sodium hydroxide solution is raw Material is 10 with the mass ratio of aqueous slkali:100,80-95 DEG C, heat time 1.5-2.5h.Described briquetting pressure 8-35Mpa.