CN110791350B

CN110791350B - Biomass fuel slurry and preparation method thereof

Info

Publication number: CN110791350B
Application number: CN201810863474.7A
Authority: CN
Inventors: 汪洋; 周俊虎; 刘树刚; 文光旭; 张永亮; 潘宏春
Original assignee: Tanfo Co ltd
Current assignee: Tanfo Co ltd
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2021-05-04
Anticipated expiration: 2038-08-01
Also published as: CN110791350A

Abstract

The invention provides biomass fuel slurry and a preparation method thereof, and is characterized in that: comprises the following steps; 1) heating and drying the biomass, and crushing the biomass into biomass powder; 2) adding an acidic solution into the biomass powder, heating, and then adding an alkaline solution to neutralize acidity to obtain a biomass dispersion liquid; 3) adding water into the biomass dispersion liquid, uniformly stirring, and heating for 2 hours in an oven at 80 ℃ by a hydrothermal method; 4) and then sequentially adding formaldehyde, sodium sulfite, linoleic acid and alkyl phosphate carboxylate, uniformly stirring, and keeping the temperature to continuously react to obtain the biomass fuel slurry. The biomass fuel slurry prepared by the preparation method has good fluidity and stability.

Description

Biomass fuel slurry and preparation method thereof

Technical Field

The invention relates to a fuel slurry prepared by using biomass as a main raw material and a preparation method thereof.

Background

The medium coal which is always consumed in China as primary energy is consumed by about 72 percent, and the energy consumption structure of China still mainly uses coal in a quite long time. With the increasing environmental demands, there is an urgent need for a clean fuel.

China is a big agricultural country, and forest resources are rich, so that a large amount of agricultural and forestry wastes such as shells, straws and wood chips are generated, and the utilization of the renewable biological wastes as fuels is an effective green energy mode.

The biomass is a hydrophobic substance after being pretreated by drying and crushing, has fine granularity and large specific surface area, and is difficult to be closely combined with water to form slurry. And is easily separated from water due to its density difference with water. Good rheology and stability are the most important properties of biomass pulp, and how to make biomass pulp have good fluid properties becomes a problem to be solved by technicians.

Disclosure of Invention

A first object of the present invention is to overcome the disadvantages of the prior art and to provide a biomass fuel slurry with good rheological properties and stability. The biomass fuel slurry has the characteristics of low pollution, convenience in pumping, atomizing and burning and the like, the combustion efficiency and the boiler thermal efficiency are high, and the boiler combustion load adjusting range is wide. In addition, because the exhaust gas temperature is low, the emission of nitrogen oxides can be effectively reduced, the desulfurization is easy, the environment is protected, the energy is saved, and the storage is safe, so that the fuel is an ideal fuel for replacing coal and oil.

The second purpose of the invention is to provide a preparation method of biomass fuel slurry, which has no discharge of three wastes in the preparation process and is environment-friendly, pollution-free and clean production.

The technical scheme adopted by the invention for solving the problems is as follows:

a preparation method of biomass fuel slurry is characterized by comprising the following steps: comprises the following steps;

1) heating and drying the biomass, and crushing the biomass into biomass powder;

2) adding an acidic solution into the biomass powder, heating, adding an alkaline solution to neutralize acidity, and reacting with carbon elements in the biomass powder to generate potassium carbonate and hydrogen to obtain dissociated porous biomass dispersion liquid;

3) adding water into the biomass dispersion liquid, uniformly stirring, and heating for 2 hours in an oven at 80 ℃ by a hydrothermal method;

4) then adding formaldehyde with the mass concentration of 5%, continuing to react for 1 hour, and then adding sodium sulfite with the mass concentration of 10% to generate lignosulfonate; after the charging is finished, preserving the heat for 1 hour; continuously heating to 90 ℃, adding linoleic acid with the mass concentration of 20% and alkyl phosphate carboxylate with the mass concentration of 5%, uniformly stirring, keeping the temperature, continuously reacting for 3 hours, cooling and discharging to obtain the biomass fuel slurry; wherein the proportion of the biomass dispersion liquid, the formaldehyde, the sodium sulfite, the linoleic acid and the alkyl phosphate carboxylate is 80-82:1-2:2-3:2-3:1-2, preferably 80:2:2:3: 1.

The additives such as formaldehyde, sodium sulfite, linoleic acid, alkyl phosphate carboxylate and the like have the main effects of changing the surface properties of the biomass particles through the adsorption effect on the surfaces of the biomass particles, so that the stability and rheological property of the suspension system are improved, and the biomass fuel slurry has good fluidity and stability.

Further, in the step 2), the ratio of the biomass powder to the acidic solution and the alkaline solution is 1-2: 9-11: 9-11, preferably 1:10: 10.

Further, the acid solution is oxalic acid solution with the mass fraction of 8 percent,

further, the alkaline solution is 1g/ml of potassium hydroxide.

Further, the biomass is agricultural waste biological material.

Further, the particle size of the powder in the step 1) is 100 meshes.

Further, in the step 1), the biomass is placed into a muffle furnace at the temperature of 150-180 ℃ for continuous heating for 6 hours, and then cooled to room temperature for drying.

Further, in the step 2), the heating treatment of the acid solution is that the biomass powder reacts in the acid solution at 180-200 ℃ for 2 hours.

Further, in the step 3), water is added into the biomass dispersion liquid for stirring, and after heating and temperature rising are started, ultrasonic dispersion is firstly adopted for 10-30 minutes, so that the biomass powder is uniformly dispersed, and then hydrothermal heating is carried out.

A biomass fuel slurry is prepared by the preparation method.

The invention has the beneficial effects that:

1. the invention selects the waste biomass for preparation, can reduce the production cost of the high-performance biomass fuel slurry, directly and effectively utilizes the loose porous structure in the waste biomass material, and plays a role in recycling waste resources.

2. The invention selects the waste biomass with environmental pollution influence to prepare the biomass fuel slurry, can efficiently utilize waste resources, plays a role in energy conservation and environmental protection, and can provide a new green and environmental-friendly development route for the treatment of three wastes.

3. The invention has simple production process and mild conditions, the feeding and the conditions in the production process are easy to control, the product is non-toxic and harmless, the use is not limited by seasons and regions, the transportation and the storage are convenient, and compared with the common biomass fuel, the invention can use an oil-fired boiler.

4. Various additives are used to achieve the purpose of chemical modification. The prepared product has carboxyl, sulfonic group and other anionic groups, so that the prepared biomass fuel slurry can adapt to more raw materials, and the prepared biomass fuel slurry has the characteristics of good stability and excellent fluidity.

5. The invention uses biomass to prepare biomass fuel slurry, has no discharge of three wastes in the whole process, and is a green, environment-friendly, pollution-free and clean production process.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

Example 1

The biomass fuel slurry is prepared by the following steps:

1. and putting the waste biomass into a muffle furnace at the temperature of 150 ℃ for continuous heating for 6 hours, and then cooling to room temperature for drying and storing.

2. And (3) putting the biomass material into a circulating biomass material crusher for crushing, and then sieving by a 20-mesh sieve to obtain the crushed biomass material. And (3) putting the crushed biomass material into a grinding machine for dry grinding for 2h, and then sieving by a 100-mesh sieve to obtain ground biomass powder.

3. The method comprises the following steps of putting biomass powder into an acid solution, wherein the acid solution is oxalic acid solution with the mass fraction of 8%, and the ratio of the acid solution to the biomass powder is that 1g of biomass powder is added into every 10ml of the acid solution. Heating to 200 ℃ and reacting for 2 hours.

4. Adding an alkaline solution, wherein the alkaline solution is a potassium hydroxide solution with the concentration of 1g/ml, the ratio of the alkaline solution to the biomass powder is 1g biomass powder in every 10ml of the alkaline solution, and the stirring and dispersing time is 2 hours. The acidity is neutralized and reacted with carbon element in the biomass to generate potassium carbonate and hydrogen, and porous gaps are promoted to be formed in the biomass. Obtaining the dissociated biomass dispersion liquid.

5. Adding 40 parts by weight of water into 80 parts by weight of biomass dispersion liquid, starting stirring, and starting heating to raise the temperature; and dispersing the biomass powder uniformly by using ultrasonic for 10-30 minutes. Heating in an oven at 80 deg.C for 2 hr by hydrothermal method.

6. When the temperature is raised to 80 ℃, adding 2 parts by weight of formaldehyde with the mass concentration of 5%, continuing to react for 1 hour, and adding 2 parts by weight of sodium sulfite with the mass concentration of 10% to generate lignosulfonate. After the charging is finished, preserving the heat for 1 hour; and when the mixture is continuously heated to 90 ℃, 3 parts by weight of linoleic acid with the mass concentration of 20% and 1 part by weight of alkyl phosphate carboxylate with the mass concentration of 5% are uniformly stirred, the temperature is kept for continuous reaction for 3 hours, and the biomass fuel slurry finished product is obtained after cooling and discharging. The mixture of high-concentration fuel and water is prepared by using the biomass fuel powder, and the biomass fuel powder is used as a clean fuel for replacing oil, has the characteristics of low pollution, convenience in pumping, atomizing and burning and the like, and is an important component in the clean coal technology. The biomass slurry is a solid-liquid dispersion system which consists of water accounting for 60 to 70 mass percent of biomass and about 30 percent of water and additives accounting for about 1 percent of the water. The combustion efficiency of the biomass fuel slurry and the thermal efficiency of the boiler are both high, and the combustion load adjusting range of the boiler is wide. In addition, because the exhaust gas temperature is low, the emission of nitrogen oxides can be effectively reduced, the desulfurization is easy, the environment is protected, the energy is saved, and the storage is safe, so that the fuel is an ideal fuel for replacing coal and oil.

Claims

1. A preparation method of biomass fuel slurry is characterized by comprising the following steps: comprises the following steps;

1) placing the biomass into a muffle furnace at 150-180 ℃ for continuous heating for 6 hours, cooling to room temperature for drying, and crushing into biomass powder;

2) adding an acidic solution into the biomass powder, reacting at 180-200 ℃ for 2 hours in the acidic solution for heating treatment, then adding an alkaline solution for neutralizing acidity, and reacting with carbon elements in the biomass powder to generate potassium carbonate and hydrogen to obtain dissociated porous biomass dispersion liquid;

3) adding water into the porous biomass dispersion liquid, uniformly stirring, and heating for 2 hours in an oven at 80 ℃ by a hydrothermal method;

4) then adding formaldehyde with the mass concentration of 5%, continuing to react for 1 hour, and then adding sodium sulfite with the mass concentration of 10% to generate lignosulfonate; after the charging is finished, preserving the heat for 1 hour; continuously heating to 90 ℃, adding linoleic acid with the mass concentration of 20% and alkyl phosphate carboxylate with the mass concentration of 5%, uniformly stirring, keeping the temperature, continuously reacting for 3 hours, cooling and discharging to obtain the biomass fuel slurry; wherein the proportion of the porous biomass dispersion liquid, the formaldehyde, the sodium sulfite, the linoleic acid and the alkyl phosphate carboxylate is 80-82:1-2:2-3:2-3:1-2 in parts by weight.

2. The method of producing a biomass fuel slurry as claimed in claim 1, characterized in that: in the step 2), the ratio of the biomass powder to the acidic solution and the alkaline solution is 1-2: 9-11: 9-11.

3. The method of producing a biomass fuel slurry as claimed in claim 1, characterized in that: the acid solution is oxalic acid solution with the mass fraction of 8%.

4. The method of producing a biomass fuel slurry as claimed in claim 1, characterized in that: the alkaline solution is 1g/ml of potassium hydroxide.

5. The method of producing a biomass fuel slurry as claimed in claim 1, characterized in that: the biomass is agricultural waste biological material.

6. The method of producing a biomass fuel slurry as claimed in claim 1, characterized in that: the particle size of the powder in the step 1) is 100 meshes.

7. The method of producing a biomass fuel slurry as claimed in claim 1, characterized in that: the proportion of the porous biomass dispersion, formaldehyde, sodium sulfite, linoleic acid and alkyl phosphorus carboxylate is preferably 80:2:2:3:1 in parts by weight.

8. The method of producing a biomass fuel slurry as claimed in claim 2, characterized in that: in step 2), the ratio of the biomass powder to the acidic solution and the alkaline solution is preferably 1:10: 10.

9. The method of producing a biomass fuel slurry as claimed in claim 1, characterized in that: in the step 3), water is added into the porous biomass dispersion liquid for stirring, and after heating and temperature rising are started, ultrasonic dispersion is firstly adopted for 10-30 minutes, so that the porous biomass is uniformly dispersed, and then hydrothermal heating is carried out.

10. A biomass fuel slurry produced by the production method according to any one of claims 1 to 9.