CN-116144329-B - Antifreezing solution for heat source tower

Abstract

The invention discloses an antifreezing solution for a heat source tower, which consists of organic salt, acrylic acid polymer, quaternary ammonium salt, benzotriazole, sodium molybdate, alcohol and water. According to the invention, organic salt, acrylic acid polymer, quaternary ammonium salt, benzotriazole, sodium molybdate, alcohol, water and the like are mixed to obtain the antifreeze used in the cyclic heat exchange process of the northern heat source tower system, wherein the organic salt is used as a low-temperature resistant agent, and the pyridine quaternary ammonium salt, the benzotriazole and the sodium molybdate mainly play a role in corrosion protection, so that the synergistic effect among the components of the antifreeze is obvious, the obtained antifreeze has lower and more stable freezing point, and has the anti-corrosion characteristic on materials such as carbon steel, stainless steel and copper, thereby meeting the technical requirements of using the antifreeze in the northern heat source tower heat pump. In addition, the obtained antifreeze solution has the characteristics of low cost and good environmental protection.

Inventors

• ZHANG CHAO
• GUO YUHU
• LI XIUSHAN
• JING PENGFEI
• TONG GAOQIANG
• PANG YUXIN

Assignees

• 北京金茂绿建科技有限公司

Dates

Publication Date

20260508

Application Date

20221219

Claims (3)

1. 1. The antifreeze fluid for the heat source tower is characterized by comprising organic salt, acrylic acid polymer, quaternary ammonium salt, benzotriazole, sodium molybdate, alcohol and water, wherein the organic salt is one of sodium formate, potassium formate, magnesium formate, lithium formate, ammonium formate, sodium lactate, potassium lactate, sodium acetate, potassium acetate, sodium citrate and potassium citrate, the alcohol is one of glycerol, glycol and polyethylene glycol-200-2000, the mass fraction of the alcohol is 0.06% -0.1%, the mass fraction of the organic salt is 5% -35%, the mass fraction of the acrylic acid polymer is 0.001% -0.008%, the mass fraction of the quaternary ammonium salt is 0.003% -0.015%, the mass fraction of the benzotriazole is 0.03% -0.10%, and the mass fraction of the sodium molybdate is 0.002% -0.01%.
2. 2. The antifreeze of claim 1, wherein the acrylic polymer is polyacrylic acid or a polyacrylic acid-sodium acrylate copolymer, and wherein the acrylic polymer has an average molecular weight of 1000 g/mol to 2000 g/mol.
3. 3. The antifreeze of claim 1, wherein said quaternary ammonium salt is a quaternary pyridinium salt or an imidazolinium salt, wherein said quaternary pyridinium salt is benzyl pyridinium chloride and said imidazolinium salt is a quaternary 2- (2- (octadecyl-9-enyl) -4,5 dihydro-imidazolin-1-methyl) ethylenediamine ammonium salt.

Description

Antifreezing solution for heat source tower Technical Field The invention relates to the technical field of energy, in particular to an antifreezing solution for a heat source tower. Background A heat source tower heat pump system has attracted attention as a newer type of heat pump system. Compared with an air source heat pump, the heat source tower heat pump has great advantages in the problem of frosting of the air source heat pump in winter and the operation cost. From the current research, the heat source tower heat pump is mainly distributed in the southern area of China, is rarely used in the north of China, and is extremely immature due to the climate difference of the south and the north. Because winter temperature in northern areas is lower than that in southern areas, proper heat source tower antifreeze is required to be selected so as to ensure that a heat source tower heat pump system can efficiently, safely and stably operate in northern areas. The main functions of the antifreeze are heat dissipation and antifreeze, and the antifreeze in the prior art is mainly a calcium chloride system, a silicate system and an organic alcohol system. In the practical application process, the three anti-freezing solution systems have some problems that the calcium chloride anti-freezing solution system and the calcium chloride aqueous solution can cause serious corrosion to metal materials and can generate precipitates very easily, the silicate anti-freezing solution system is unstable in the circulating cooling process and can form flocculent insoluble substances very easily, the stability is poor, and the organic alcohol anti-freezing solution system is volatile and can be oxidized for a long time. Therefore, the common antifreeze system in the prior art is unstable, and the materials used by the heat source tower circulation system are carbon steel, stainless steel and copper, so that the three antifreeze systems are not suitable for the heat source tower system due to instability. Therefore, how to find an antifreeze solution which is stable and suitable for a northern heat source tower circulating system made of carbon steel, stainless steel and copper in the energy technology is a technical problem to be solved urgently at present. Disclosure of Invention In order to solve the problems, the invention provides an antifreezing solution for a heat source tower, which consists of organic salt, acrylic acid polymer, quaternary ammonium salt, benzotriazole, sodium molybdate, alcohol and water. Preferably, the organic salt is one of sodium formate, potassium formate, magnesium formate, lithium formate, ammonium formate, sodium lactate, potassium lactate, sodium acetate, potassium acetate, sodium citrate, and potassium citrate. Preferably, the acrylic acid polymer is polyacrylic acid or polyacrylic acid-sodium acrylate copolymer, wherein the average molecular weight of the acrylic acid polymer is 1000 g/mol-2000 g/mol. Preferably, the quaternary ammonium salt is pyridine quaternary ammonium salt or imidazoline quaternary ammonium salt, wherein the pyridine quaternary ammonium salt is benzyl pyridine chloride, and the imidazoline quaternary ammonium salt is one of imidazoline 2- (2- (octadecyl-9-alkenyl) -4,5 dihydro-imidazoline-1 methyl) ethylenediamine quaternary ammonium salt. Preferably, the alcohol is one of glycerol, ethylene glycol and polyethylene glycol-200-2000, wherein the mass fraction of the alcohol is 0.06% -0.1%. Preferably, the mass fraction of the organic salt is 5% -35%. Preferably, the mass fraction of the acrylic polymer is 0.001% -0.008%. Preferably, the mass fraction of the quaternary ammonium salt is 0.003% -0.015%. Preferably, the mass fraction of the benzotriazole is 0.03% -0.10%. Preferably, the mass fraction of the sodium molybdate is 0.002% -0.01%. Compared with the prior art, the invention has the following advantages: The invention discloses an antifreezing solution for a heat source tower, which consists of organic salt, acrylic acid polymer, quaternary ammonium salt, benzotriazole, sodium molybdate, alcohol and water. According to the invention, organic salt, acrylic acid polymer, quaternary ammonium salt, benzotriazole, sodium molybdate, alcohol, water and the like are mixed to obtain the antifreeze used in the cyclic heat exchange process of the northern heat source tower system, wherein the organic salt is used as a low-temperature resistant agent, and the pyridine quaternary ammonium salt, the benzotriazole and the sodium molybdate mainly play a role in corrosion protection, so that the synergistic effect among the components of the antifreeze is obvious, the obtained antifreeze has lower and more stable freezing point, and has the anti-corrosion characteristic on materials such as carbon steel, stainless steel and copper, thereby meeting the technical requirements of using the antifreeze in the northern heat source tower heat pump. In addition, the obtained antifreeze soluti