阅读说明：本技术 一种煤气化高硬高碱度渣水无磷阻垢分散剂 (Coal gasification high-hardness high-alkalinity slag water phosphorus-free scale inhibition and dispersion agent ) 是由 王肇君 康红欣 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种煤气化高硬高碱度渣水无磷阻垢分散剂,其由下述含量的组分组成：2-丙烯酰胺-2-甲基丙磺酸1％～10％、丙烯酸1％～8％、烯丙基磺酸钠1％～20％、异丁烯/马来酸酐共聚物2％～10％、丙烯酸/2-甲基-2-丙烯酰胺基丙磺酸/丙烯磺酸钠/三元共聚物10％～40％、马来酸酐/丙烯酸/丙烯磺酸钠/聚马来酸四元共聚物10％～40％,丙烯酸/丙烯磺酸/环氧琥珀酸三元共聚物1％～30％、聚天冬氨酸0.5％～40％、高温稳定剂1％～5％、余量为水。本发明无磷阻垢分散剂能在80℃～270℃温度下有效抑制煤气化总硬总碱均超过30mmol/L渣水系统的沉积结垢状况,阻垢率达到85％以上,使煤气化系统关键部位结垢倾向明显减轻,实现系统稳定运行,降低系统外排水含磷量,实现节能减排。(The invention discloses a coal gasification high-hardness high-alkalinity slag water phosphorus-free scale inhibition and dispersion agent, which consists of the following components in percentage by weight: 1-10% of 2-acrylamide-2-methylpropanesulfonic acid, 1-8% of acrylic acid, 1-20% of sodium allylsulfonate, 2-10% of isobutylene/maleic anhydride copolymer, 10-40% of acrylic acid/2-methyl-2-acrylamidopropanesulfonic acid/sodium allylsulfonate/terpolymer, 10-40% of maleic anhydride/acrylic acid/sodium allylsulfonate/polymaleic acid tetrapolymer, 1-30% of acrylic acid/propylene sulfonic acid/epoxy succinic acid terpolymer, 0.5-40% of polyaspartic acid, 1-5% of high-temperature stabilizer and the balance of water. The phosphorus-free scale inhibition and dispersion agent can effectively inhibit the deposition and scaling condition of a coal gasification total hard total alkali over 30mmol/L slag water system at the temperature of 80-270 ℃, the scale inhibition rate reaches more than 85%, the scaling tendency of key parts of a coal gasification system is obviously reduced, the stable operation of the system is realized, the phosphorus content of discharged water of the system is reduced, and the energy conservation and emission reduction are realized.)

1. A coal gasification high-hardness high-alkali slag water phosphorus-free scale inhibition and dispersion agent is characterized in that: the composition comprises the following components in percentage by mass: 1-10% of 2-acrylamide-2-methylpropanesulfonic acid, 1-8% of acrylic acid, 1-20% of sodium allylsulfonate, 2-10% of isobutylene/maleic anhydride copolymer with the molar ratio of 1: 0.3-0.6, 10-40% of acrylic acid/2-methyl-2-acrylamidopropanesulfonic acid/sodium allylsulfonate/terpolymer with the molar ratio of 3-4: 1:2, 10-40% of maleic anhydride/acrylic acid/sodium allylsulfonate/polymaleic acid tetrapolymer with the molar ratio of 1: 2-3: 1:2, 1-30% of acrylic acid/propylene sulfonic acid/epoxy succinic acid terpolymer, 0.5-40% of polyaspartic acid, 1-5% of concentrated sulfuric acid as a high-temperature stabilizer and the balance of water, wherein the molar ratio of the acrylic acid/propylene sulfonic acid/epoxy succinic acid terpolymer to the polyaspartic acid is 2-3: 2: 1.

2. The coal gasification high-hardness high-alkali slag water phosphorus-free scale-inhibiting dispersant of claim 1, which is characterized in that: the total hardness and the total alkalinity of the coal gasification high-hardness high-alkali slag water exceed 30mmol/L, and the temperature of the slag water is 80-270 ℃.

3. The coal gasification high-hardness high-alkali slag water phosphorus-free scale-inhibiting dispersant of claim 1, which is characterized in that: the addition amount of the high-temperature stabilizing agent concentrated sulfuric acid is 3-5%.

4. The preparation method of the coal gasification slag water phosphorus-free scale inhibition and dispersion agent of claim 1 is characterized by comprising the following steps: putting 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, sodium allylsulfonate, isobutylene/maleic anhydride copolymer, acrylic acid/2-methyl-2-acrylamido propanesulfonic acid/sodium allylsulfonate/terpolymer, maleic anhydride/acrylic acid/sodium allylsulfonate/polymaleic acid tetrapolymer, acrylic acid/propylene sulfonic acid/polyepoxysuccinic acid terpolymer, polyaspartic acid, a high-temperature stabilizer and water into a closed or pressure container according to a proportion, stirring under the conditions of controlling the reaction temperature to be 50-60 ℃ and the pressure to be 0.1MPa, and uniformly stirring until the components are completely dissolved to obtain the colorless or amber phosphorus-free scale and scale inhibiting dispersant.

The technical field is as follows:

the invention belongs to the water treatment technology of a coal gasification slag water system, and particularly relates to a coal gasification high-hardness high-alkalinity slag water phosphorus-free scale inhibition dispersant and application thereof in coal gasification high-hardness high-alkalinity slag water treatment.

Background

The coal gasification technology is the basis of the process industries of coal-based chemicals, coal-based liquid fuels, coal gasification combined cycle power generation, poly-generation and the like; is a key common technology in the technical field of clean coal; has the characteristics of high efficiency and ultra-cleanness, and is the mainstream of the coal technology development in the world today. The entrained flow coal gasification technology is particularly suitable for large-scale industrial production.

Since the first coal water slurry pressurized gasification device in Texaco was started in the fertilizer plant in Lunan, more than ten devices of the type have been developed in China in the last ten years and all the devices have been successful. The foreign coal gasification is mainly used for producing fuel gas and circulating power generation, the requirements on the purification of the synthetic gas are not particularly strict, the treatment of the slag water is relatively simple, while the domestic synthetic gas is mainly used as the raw material gas of chemical products, and the requirements on the dust content of the synthetic gas are strict, so that the coal gasification high-hardness high-alkalinity slag water system is an important technical link, and whether the slag water system is operated normally or not directly influences whether the whole system can operate safely and stably for a long period or not. Aiming at the problems that various plants in China have been continuously innovated and reformed in the aspect of slag water systems, the slag water systems are relatively stable in operation, but in recent years, the environmental protection supervision is more and more intensive, the requirements on the amount and indexes of discharged water of coal gasification plants are more and more strict, the total alkalinity and the total hardness index of gasification grey water are more and more high, and except the reformation of process equipment, a phosphorus-free scale inhibition dispersing agent which can adapt to the total hardness and the total alkalinity of more than 30mmol/L is the most ideal treatment method.

At present, due to the influence of factors such as coal quality, environment and the like, suspended matters, alkalinity and hardness in water of a coal gasification slag water system are continuously increased, and the requirement on a scale inhibition and dispersion agent is also continuously increased. Therefore, the development of the efficient phosphorus-free scale inhibition and dispersion agent for the coal gasification ultrahigh-hardness slag water circulation treatment is a necessary trend in the field of coal gasification slag water treatment.

Disclosure of Invention

Aiming at the problem that the prior art is difficult to effectively treat high-temperature slag water with the total hardness and total alkalinity of coal gasification being more than 30mmol/L, the invention provides a non-phosphorus scale inhibiting and dispersing agent capable of efficiently treating high-hardness and high-alkalinity slag water of coal gasification.

In order to solve the technical problems, the invention provides a coal gasification ultrahigh hardness alkalinity slag water phosphorus-free scale inhibition and dispersion agent, which comprises the following components in percentage by weight: 1-10% of 2-acrylamide-2-methylpropanesulfonic acid, 1-8% of acrylic acid, 1-20% of sodium allylsulfonate, 2-10% of isobutylene/maleic anhydride copolymer with the molar ratio of 1: 0.3-0.6, 10-40% of acrylic acid/2-methyl-2-acrylamidopropanesulfonic acid/sodium allylsulfonate/terpolymer with the molar ratio of 3-4: 1:2, 10-40% of maleic anhydride/acrylic acid/sodium allylsulfonate/polymaleic acid tetrapolymer with the molar ratio of 1: 2-3: 1:2, 1-30% of acrylic acid/propylene sulfonic acid/epoxy succinic acid terpolymer, 0.5-40% of polyaspartic acid, 1-5% of high-temperature stabilizer concentrated sulfuric acid and the balance of water, wherein the molar ratio of the acrylic acid/propylene sulfonic acid/epoxy succinic acid terpolymer to the polypropylene/epoxy succinic acid terpolymer is 2-3: 2: 1.

The invention further provides a preparation method of the coal gasification high-hardness high-alkalinity slag water phosphorus-free scale inhibition and dispersion agent, which specifically comprises the following steps: putting 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, sodium allylsulfonate, isobutylene/maleic anhydride copolymer, acrylic acid/2-methyl-2-acrylamido propanesulfonic acid/sodium allylsulfonate/terpolymer, maleic anhydride/acrylic acid/sodium allylsulfonate/polymaleic acid tetrapolymer, acrylic acid/propylene sulfonic acid/epoxy succinic acid terpolymer, polyaspartic acid, high-temperature stabilizer and water into a closed or pressure container, stirring under the conditions of controlling the reaction temperature within the range of 50-60 ℃ and controlling the pressure within 0.1MPa, and uniformly stirring until the components are completely dissolved to obtain the colorless to amber phosphorus-free scale and scale inhibiting dispersant.

The coal gasification ultrahigh hardness alkalinity slag water phosphorus-free scale inhibition and dispersion agent has the functions of scale inhibition and dispersion of the components of phosphorus-free single agent and multipolymer, but is difficult to still play a good role in scale inhibition and dispersion on high-temperature and high-pressure slag water with total alkalinity and total hardness of more than 30mmol/L after being compounded, because the multipolymer is easily decomposed into monomers in a high-temperature high-pressure coal gasification system, the scale inhibition and dispersion effects of the multipolymer are lost, and the high-temperature stabilizing agent concentrated sulfuric acid is added to the coal gasification system aiming at the water quality with the total alkalinity and the total hardness of more than 30mmol/L, the components and the proportion of the high-temperature stabilizer play a crucial role, the boiling point of concentrated sulfuric acid is 338 ℃, the concentrated sulfuric acid is not easy to decompose, the high-temperature stabilizer can well stabilize the copolymerization form of the multipolymer under high temperature and high pressure, the synergistic effect of the single agent and the multipolymer is ensured, and the crystallization of calcium carbonate and the deposition of ash are jointly inhibited.

Compared with the existing scale inhibiting and dispersing agent, the coal gasification high-hardness high-alkalinity slag water phosphorus-free scale inhibiting and dispersing agent has the following beneficial effects: the phosphorus-free scale inhibition and dispersion agent can effectively inhibit the deposition and scaling condition of an ash water system with total hardness and total alkali of more than 30mmol/L in a coal gasification slag water system at the temperature of 80-270 ℃, the scale inhibition rate of a laboratory can reach more than 85%, the scaling tendency of key parts such as a coal gasification system chilling ring outer distribution pipe, a chilling water pipeline, a black water pipeline, a crude synthesis gas outlet Venturi, a carbon washing tower tray and the like after industrial application is obviously reduced, the long-period stable running of the ultra-high coal gasification hardness slag water system without stopping for three months is realized, meanwhile, the fractional utilization of a plurality of water resources of the system is realized, the control of the water resources of an enterprise is optimized, the phosphorus content of discharged water of the system is effectively reduced, and the purposes of energy conservation and emission reduction of the.

Detailed Description