A ZD type composite gasification coal water slurry additive and its application

Abstract

The present invention relates to an additive and its application, and specifically to a ZD type composite gasification water-coal slurry additive and its application. The additive is a liquid composite gasification water-coal slurry additive with papermaking black liquor as the main agent and anionic surfactant as the auxiliary agent, and the additive includes the following weight components: 60-98.5% of papermaking black liquor, 0.5-9.0% of polystyrene sulfonate, and 1.0-10.0% of methyl propylene sulfonate. The above components form the additive according to a certain weight ratio, and can be prepared with graded coal powder into water-coal slurry with any solid content. The water-coal slurry additive is not only cost-effective, but also has the function of eliminating papermaking black liquor pollution and saving environmental protection costs; and the finished water-coal slurry has a high concentration, appropriate viscosity, and good fluidity, and is particularly suitable for use in the coal gasification process of large-scale coal chemical plants.

Description

Technical Field

[0001] The invention relates to an additive and its application, and relates to a composite additive for gasified coal water slurry, and in particular to a composite gasified coal water slurry additive with papermaking black liquor as a main agent and anionic surfactant as an auxiliary agent, and its application in coal gasification of coal chemical production equipment. Background Art

[0002] Coal-water slurry is a graded coal powder with water and additives, which is ground and mixed to form a liquid fuel with a certain degree of stability similar to crude oil. It is a great improvement in coal powder combustion. The development and industrial application of coal-water slurry products have been in my country for decades. It has changed the traditional way of coal combustion and demonstrated the advantages of energy saving and environmental protection. Therefore, it is widely used in various industrial sectors. Due to the recent vigorous development of coal chemical industry, a large amount of coal-water slurry is needed to be applied to coal gasification in coal chemical industry. In order to increase the concentration of coal-water slurry and the economic benefits of coal gasification in coal chemical industry, it is urgent to develop a cost-effective coal-water slurry additive.

[0003] Papermaking black liquor is a huge source of pollution. The waste liquid contains organic pollutants and toxic substances and has a special odor. Its biochemical oxygen content (BOD) can be as high as 5000-40000g / L. Processing it will inevitably require a lot of manpower, material resources and funds. If it is directly added to water-coal slurry without separation, it will be beneficial and harmless.

[0004] Therefore, providing an additive that can eliminate papermaking black liquor pollution and save environmental protection costs, and improve the performance of the finished water-coal slurry so that it is suitable for use in the coal gasification process of large-scale coal chemical plants is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] In view of this, the present invention aims to develop a water-coal slurry additive with high cost performance.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A ZD type composite gasification water-coal slurry additive, the raw material composition of the additive, in terms of mass percentage, comprises:

[0008] Papermaking black liquor 60-98.5%, polystyrene sulfonate 0.5-30%, methyl propylene sulfonate 1.0-10.0%.

[0009] Further optionally, the solid content of the papermaking black liquor is 40-50%, and the relative density is 1.12-1.23 g / cm 3, pH value>12; and when used specifically, sulfuric acid is needed to adjust the pH to 10-12, the weight percentage of organic matter in the total solid content is 32.58-39.87%, the weight percentage of inorganic matter is 7.42-10.13%, and the rest is water.

[0010] Further optionally, the methacrylic acid sulfonate is sodium methacrylic acid sulfonate or zinc methacrylic acid sulfonate.

[0011] Further optionally, the polystyrene sulfonate is sodium polystyrene sulfonate or ammonium polystyrene sulfonate.

[0012] The present invention also seeks to protect the use of the above-mentioned ZD type composite gasification water-coal slurry additive in coal gasification of coal chemical production equipment.

[0013] Specifically, the components of the additive are mixed according to weight ratio to form a liquid coal water slurry additive, and then mixed with coal powder and ground and stirred evenly to obtain a coal water slurry with good flow stability;

[0014] The amount of the liquid water-coal slurry additive is 0.1-1.0% of the weight of the dry basis coal powder; and the solid content of the liquid water-coal additive is 40-50%.

[0015] Furthermore, the liquid water-coal additive is combined with coal powder and water to form a water-coal slurry of any percentage concentration, and the liquid additive is used in a proportion of 0.1-1.0% of the dry basis coal powder.

[0016] It can be seen from the above technical solution that, compared with the prior art, the ZD type composite gasification water-coal slurry additive and its application provided by the present invention have the following excellent effects:

[0017] The invention discloses a composite liquid water-coal slurry additive prepared by uniformly mixing unseparated papermaking black liquor with anionic surfactants polystyrene sulfonate and methyl propylene sulfonate, and discloses the application of the additive in coal gasification of coal chemical production equipment.

[0018] Specifically, the finished coal-water slurry prepared by using the coal-water slurry additive of the present invention has high concentration, appropriate viscosity, strong stability, good fluidity, and can adapt to a wide range of coal types; and the coal-water slurry additive can save environmental protection costs and eliminate toxic pollution because it directly uses unseparated papermaking black liquor. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The embodiment of the invention discloses a ZD type composite gasification water-coal slurry additive and application thereof.

[0021] In order to better understand the present invention, the present invention is further specifically described below through the following examples, but it should not be understood as a limitation of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above invention content are also considered to fall within the protection scope of the present invention.

[0022] The technical solution of the present invention will be further described below in conjunction with specific embodiments.

[0023] Example 1

[0024] A ZD type composite gasification water-coal slurry additive is composed of the following raw materials:

[0025] Papermaking black liquor 60.0%, polystyrene sulfonate 30.0%, methyl propylene sulfonate 10.0%.

[0026] Example 2

[0027] A ZD type composite gasification water-coal slurry additive is composed of the following raw materials:

[0028] Papermaking black liquor 72%, polystyrene sulfonate 20.0%, methyl propylene sulfonate 8.0%.

[0029] Example 3

[0030] A ZD type composite gasification water-coal slurry additive is composed of the following raw materials:

[0031] Papermaking black liquor 83%, polystyrene sulfonate 15.0%, methyl propylene sulfonate 2.0%.

[0032] Example 4

[0033] A ZD type composite gasification water-coal slurry additive is composed of the following raw materials:

[0034] Papermaking black liquor 95%, polystyrene sulfonate 2.0%, methyl propylene sulfonate 3.0%.

[0035] Example 5

[0036] A ZD type composite gasification water-coal slurry additive is composed of the following raw materials:

[0037] Papermaking black liquor 96%, polystyrene sulfonate 2.0%, methyl propylene sulfonate 2.0%.

[0038] Example 6

[0039] A ZD type composite gasification water-coal slurry additive is composed of the following raw materials:

[0040] Papermaking black liquor 97%, polystyrene sulfonate 1.0%, methyl propylene sulfonate 2.0%.

[0041] The advantages of the technical solution of the present invention will be specifically described below in conjunction with application examples, as shown below:

[0042] Application Example 1

[0043] Shanxi Yangquan coal is used, and the additive dosage is 3 kg per ton of slurry according to the formula of Example 1. The average particle size of the coal powder is 70 μm, and the apparent viscosity of the slurry is 800-850 mPas. -1 The concentration of the water-coal slurry is 68.5% by weight, and there is no precipitation after being placed for 72 hours.

[0044] Application Example 2

[0045] Shanxi Yangquan Longde coal was used, and the additives were formulated according to Example 2. The additive dosage per ton of slurry was 3.4 kg, the average particle size of the coal powder was 75 μm, and the apparent viscosity of the slurry was 750-780 mPas. -1 The water-coal slurry concentration is 67.8% by weight, the slurry has good fluidity and strong shear resistance, and there is no hard pure precipitation after being placed for 72 hours.

[0046] Application Example 3

[0047] Shenmu coal was used, and the additives were formulated according to Example 3. The additive dosage per ton of slurry was 3.5 kg, the average particle size of the coal powder was 75 μm, and the apparent viscosity of the slurry was 730-780 mPas. -1 The water-coal slurry concentration is 66.8% by weight, the slurry has good fluidity and strong shear resistance, and there is no hard pure precipitation after being placed for 72 hours.

[0048] Application Example 4

[0049] Fengxiquanji coal was used, and the additives were formulated according to Example 4. The additive dosage per ton of slurry was 3.4 kg, the average particle size of the coal powder was 75 μm, and the apparent viscosity of the slurry was 720-760 mPas. -1 The water-coal slurry concentration is 66.7% by weight, the slurry has good fluidity and strong shear resistance, and there is no hard pure precipitation after being placed for 72 hours.

[0050] Application Example 5

[0051] Shaanxi Yulin coal was used, the additive was formulated according to Example 5, the additive dosage per ton of slurry was 3.5 kg, the average particle size of the coal powder was 75 μm, and the apparent viscosity of the slurry was 670-720 mpas -1 The water-coal slurry concentration is 66.0% by weight, the slurry has good fluidity and strong shear resistance, and there is no hard pure precipitation after being placed for 72 hours.

[0052] Application Example 6

[0053] The Inner Mongolia Boda field coal was used, and the additives were formulated according to Example 6. The additive dosage per ton of slurry was 3.8 kg, the average particle size of the coal powder was 75 μm, and the apparent viscosity of the slurry was 640-700 mPas. -1 The water-coal slurry concentration is 65.7% by weight, the slurry has good fluidity and strong shear resistance, and there is no hard pure precipitation after being placed for 72 hours.

[0054] Application comparison

[0055] Shanxi Yangquan coal is used, and the additive is only papermaking black liquor. The additive per ton of pulp is 8.5 kg of papermaking black liquor with a weight of 46%, equivalent to an additive solid content of 3.91 kg, the average particle size of the coal powder is 75 μm, and the apparent viscosity of the pulp is 610-650 mpas -1 The water-coal slurry concentration is 64.0% by weight, and there is no hard pure precipitation after being placed for 72 hours.

[0056] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ZD type composite gasification coal water slurry additive, characterized in that: The raw material composition of the additive, in terms of mass percentage, includes: Papermaking black liquor 60.0-98.5%, polystyrene sulfonate 0.5-30.0%, methyl propylene sulfonate 1.0-10.0%; The methacrylic acid sulfonate is sodium methacrylic acid sulfonate or zinc methacrylic acid sulfonate; The solid content of the papermaking black liquor is 40-50%, and the relative density is 1.12-1.23 g / cm 3 , pH value>12; and when used specifically, sulfuric acid needs to be used to adjust the pH to 10~12, the weight percentage of organic matter in the total solid content is 32.58~39.87%, the weight percentage of inorganic matter is 7.42~10.13%, and the rest is water.

2. A ZD type composite gasification coal water slurry additive according to claim 1, characterized in that: The polystyrene sulfonate is sodium polystyrene sulfonate or ammonium polystyrene sulfonate.

3. Use of the ZD type composite gasification water-coal slurry additive as claimed in any one of claims 1 to 2 in coal gasification of a coal chemical production device.

4. The use according to claim 3, characterized in that: The components of the additive are mixed in weight proportion to prepare a liquid coal water slurry additive, and then mixed with coal powder and ground and stirred evenly to obtain a coal water slurry with good flow stability; The amount of the liquid coal water slurry additive is 0.1-1.0% of the dry basis coal powder weight; and the solid content of the liquid coal water slurry additive is 40-50%.