阅读说明：本技术 具备高强度的型煤的制造方法及型煤 (Method for producing briquette with high strength and briquette ) 是由 潘鑫 李鑫 刘卫星 刘明锐 李改艳 于 2019-11-26 设计创作，主要内容包括：本发明公开一种具备高强度的型煤的制造方法及型煤,其包括取瓜尔胶粉末加入至溶剂中,形成第一溶液,并朝第一溶液中通入氮气；取氢氧化钠溶液逐滴滴入第一溶液中并同时进行搅拌,以形成第二溶液；在第二溶液中加入环氧丙烷后再加入冰醋酸,得到改性瓜尔胶溶液并通过改性瓜尔胶溶液与兰炭粉混合后生产星美。本发明公开的具备高强度的型煤的制造方法将瓜尔胶进行改性后与兰炭混合,随后将氧化钙以及硝酸钾研磨后一同混合后通过挤压成型的型煤具有冷强度高、燃烧效果好且固硫率高的优点。(The invention discloses a method for manufacturing a briquette with high strength and the briquette, which comprises the steps of adding guar gum powder into a solvent to form a first solution, and introducing nitrogen into the first solution; dropwise adding a sodium hydroxide solution into the first solution while stirring to form a second solution; adding propylene oxide into the second solution, then adding glacial acetic acid to obtain a modified guar gum solution, and mixing the modified guar gum solution with semi-coke powder to produce the Xingmei. According to the method for manufacturing the briquette with high strength, disclosed by the invention, guar gum is modified and then mixed with semi coke, and then calcium oxide and potassium nitrate are ground and mixed together to form the briquette through extrusion molding, so that the briquette has the advantages of high cold strength, good combustion effect and high sulfur fixation rate.)

1. A method for manufacturing a briquette having high strength, comprising:

step one, adding guar gum powder into a solvent to form a first solution, and introducing nitrogen into the first solution;

step two, dropwise adding a sodium hydroxide solution into the first solution obtained in the step one while stirring to form a second solution;

step three, adding propylene oxide into the second solution obtained in the step two, and then adding glacial acetic acid to obtain a modified guar gum solution;

step four, grinding the semi-coke into fine powder, adding the modified guar gum solution obtained in the step three into the semi-coke powder, and fully stirring;

grinding calcium oxide and potassium nitrate into fine powder, adding the fine powder into the mixture obtained in the fourth step, and stirring to obtain a briquette raw material;

and step six, placing the molded coal raw material obtained in the step five into a rod extruding machine for extrusion forming of molded coal after wheel milling and rolling.

2. The method of manufacturing a briquette with high strength according to claim 1, wherein the first step comprises:

according to the mass fraction, 2-6 parts of guar gum are ground into fine powder of 50-200 meshes, the fine powder is added into 4-8 parts of solvent to form a first solution, and nitrogen is introduced into the first solution for 20-40 min.

3. The method for manufacturing a briquette with high strength according to claim 1, wherein the second step comprises:

and (3) dropwise adding 3-5 parts by mass of sodium hydroxide solution into the first solution obtained in the first step while stirring to form a second solution.

4. The method of manufacturing a briquette coal having high strength according to claim 1, wherein the third step comprises:

and (3) adding 8-10 parts of propylene oxide into the second solution obtained in the second step, and then adding 3-5 parts of glacial acetic acid to obtain the modified guar gum solution.

5. The method of manufacturing a briquette coal having high strength according to claim 1, wherein the fourth step comprises:

and (3) grinding 1000-1200 parts of semi-coke into fine powder of 50-100 meshes by mass, adding the modified guar gum solution obtained in the third step into the semi-coke powder, and fully stirring.

6. The method of manufacturing a molded coal having high strength according to claim 1, wherein the fifth step comprises:

and (3) grinding 20-30 parts of calcium oxide and 30-40 parts of potassium nitrate into fine powder of 50-100 meshes by mass, adding the fine powder into the mixture obtained in the fourth step, and stirring to obtain the briquette raw material.

7. The method for manufacturing a briquette with high strength according to any of claims 1 to 6, wherein the solvent is water, isopropanol or ethanol.

8. A briquette, characterized in that the briquette is made by a method according to any one of claims 1-7.

Technical Field

The invention relates to the field of molded coal, in particular to a method for manufacturing molded coal with high strength and the molded coal.

Background

The production of the briquette coal needs to be added with an adhesive, which is a core technology of the briquette coal technology, but in the existing briquette coal, the cold strength is often very low, so that a large amount of damage of the briquette coal can be caused in the processes of transportation, relocation and the like, and the problems of poor combustion effect, low sulfur fixation rate and the like in the combustion process are all existed in the manufacturing of the existing briquette coal.

Disclosure of Invention

The invention mainly aims to provide a method for manufacturing briquette with high strength and the briquette, and aims to provide the briquette with high cold strength, good combustion effect and high sulfur fixation rate.

In order to achieve the above object, the present invention provides a method for manufacturing a briquette with high strength, comprising:

step one, adding guar gum powder into a solvent to form a first solution, and introducing nitrogen into the first solution;

step two, dropwise adding a sodium hydroxide solution into the first solution obtained in the step one while stirring to form a second solution;

step three, adding propylene oxide into the second solution obtained in the step two, and then adding glacial acetic acid to obtain a modified guar gum solution;

step four, grinding the semi-coke into fine powder, adding the modified guar gum solution obtained in the step three into the semi-coke powder, and fully stirring;

grinding calcium oxide and potassium nitrate into fine powder, adding the fine powder into the mixture obtained in the fourth step, and stirring to obtain a briquette raw material;

and step six, placing the molded coal raw material obtained in the step five into a rod extruding machine for extrusion forming of molded coal after wheel milling and rolling.

In one embodiment, the first step includes:

according to the mass fraction, 2-6 parts of guar gum are ground into fine powder of 50-200 meshes, the fine powder is added into 4-8 parts of solvent to form a first solution, and nitrogen is introduced into the first solution for 20-40 min.

In one embodiment, the second step includes:

and (3) dropwise adding 3-5 parts by mass of sodium hydroxide solution into the first solution obtained in the first step while stirring to form a second solution.

In one embodiment, the third step includes:

and (3) adding 8-10 parts of propylene oxide into the second solution obtained in the second step, and then adding 3-5 parts of glacial acetic acid to obtain the modified guar gum solution.

In one embodiment, the fourth step includes:

and (3) grinding 1000-1200 parts of semi-coke into fine powder of 50-100 meshes by mass, adding the modified guar gum solution obtained in the third step into the semi-coke powder, and fully stirring.

In one embodiment, the step five includes:

and (3) grinding 20-30 parts of calcium oxide and 30-40 parts of potassium nitrate into fine powder of 50-100 meshes by mass, adding the fine powder into the mixture obtained in the fourth step, and stirring to obtain the briquette raw material.

In one embodiment, the solvent is water, isopropanol, or ethanol.

The invention also provides the briquette prepared by the method for manufacturing the briquette with high strength.

According to the technical scheme, guar gum, sodium hydroxide and propylene oxide are added into a solvent to generate a modified guar gum solution, the generated modified guar gum solution has better solubility and thickening property compared with guar gum powder, and after the modified guar gum solution is mixed with semi-coke ground into fine powder, the guar gum solution can be fully mixed with the semi-coke powder, so that the subsequently produced molded coal has higher strength, a large amount of damage can not be caused in the processes of transportation, movement and the like, and the integrity of the molded coal is ensured. Simultaneously, at the in-process that modified guar gum solution and semi-coke powder mix, add calcium oxide and potassium nitrate, add the sulfur dioxide that calcium oxide can make the moulded coal produce when burning and reduce to promote the solid sulphur rate of moulded coal, and the potassium nitrate is a combustion improver, when the moulded coal burns, is used for improving the ignition speed of moulded coal, makes the moulded coal have better combustion effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic flow chart illustrating a method for manufacturing a molded coal having high strength according to an embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

The invention provides a method for manufacturing briquette with high strength, which comprises the following steps:

s1, grinding 2-6 parts of guar gum into fine powder of 50-200 meshes, adding the fine powder into 4-8 parts of solvent to form a first solution, and introducing nitrogen into the first solution for 20-40 min;

s2, dropwise adding 3-5 parts of sodium hydroxide solution into the first solution obtained in the S1 while stirring to form a second solution;

step S3, adding 8-10 parts of propylene oxide into the second solution obtained in the step S2, and then adding 3-5 parts of glacial acetic acid to obtain a modified guar gum solution;

step S4, grinding 1000-1200 parts of semi-coke into fine powder of 50-100 meshes, adding the modified guar gum solution obtained in the step S3 into the semi-coke powder, and fully stirring;

s5, grinding 20-30 parts of calcium oxide and 30-40 parts of potassium nitrate into fine powder of 50-100 meshes, adding the fine powder into the mixture obtained in the step S4, and stirring to obtain a briquette raw material;

and S6, rolling the molded coal raw material obtained in the step S5 through a wheel mill, and then putting the molded coal raw material into a rod extruding machine to extrude and form molded coal.

The solvent may be water, isopropyl alcohol or ethanol, and isopropyl alcohol is exemplified in the following examples.

When dissolving guar gum powder in isopropanol, dropwise adding sodium hydroxide solution to enable the current system to be in an alkaline system, and enabling the alkaline system to be capable of serving as catalysis to improve reaction efficiency when propylene oxide is added for reaction.

Wherein, the reaction for preparing the modified guar gum (hydroxypropyl guar gum) by guar gum, isopropanol, sodium hydroxide and propylene oxide is a bimolecular nucleophilic substitution reaction, and the reaction equations are shown as equations (1) and (2) (the guar gum is expressed by guar-OH). The propylene oxide has high ring tension, so that the reaction for preparing the modified guar gum is easy to carry out, and guar-OCH is formed in the reaction₂-CH(CH₃)O^-Thereafter, the propylene oxide may continue to react with it, causing the hydroxypropyl chain in the modified guar to grow, as in equation (3).

In this case, the reaction system is accompanied by side reactions to produce propylene glycol and polyether, as shown in equations (4) and (5).

And as the byproduct propylene glycol is generated in the side reaction, the modified guar gum can be more viscous, and is more combustible in the subsequently produced molded coal, so that the combustion of the molded coal is more sufficient.

Meanwhile, the generated polyether has certain viscosity, so that the viscosity of the modified guar gum is better, the molecular weight of the by-product polyether is increased along with the increase of the using amount of the propylene oxide, and the viscosity and viscosity index of the polyether are correspondingly increased along with the increase of the molecular weight of the polyether

Therefore, the modified guar gum prepared by the method has very excellent viscosity, calcium oxide and potassium nitrate are added into the mixture after the blue carbon powder and the modified guar gum are mixed, sulfur dioxide generated during combustion of the molded coal can be reduced by adding the calcium oxide, the sulfur fixation rate of the molded coal is improved, and the potassium nitrate is a combustion improver and is used for improving the ignition speed of the molded coal during combustion of the molded coal, so that the molded coal has a better combustion effect.