阅读说明：本技术 一种凝汽器钛管内壁用除垢剂 (Descaling agent for inner wall of titanium tube of condenser ) 是由 孟长功 潘玉珍 赵永泉 于 2021-09-13 设计创作，主要内容包括：本发明属于钛管除垢技术领域,具体涉及一种凝汽器内壁用除垢剂；除垢剂由质量百分比5.0～30％的多羟基化合物、5.0％～15％的缓蚀阻垢剂、金属离子螯合剂和去离子水组成,在使用时根据需要控制除垢剂温度。多羟基化合物和金属离子螯合剂作为关键组分用于去除凝汽器钛管内壁沉积的锰、铝、铁、钙垢等,而缓蚀阻垢剂能有效防止钛管的化学腐蚀、电化学腐蚀和晶间腐蚀等局部腐蚀损伤,同时,本发明提出的除垢剂还能减小对环境的污染。(The invention belongs to the technical field of titanium pipe descaling, and particularly relates to a descaling agent for the inner wall of a condenser; the scale remover consists of 5.0-30% of polyhydroxy compound, 5.0-15% of corrosion and scale inhibitor, metal ion chelating agent and deionized water in percentage by mass, and the temperature of the scale remover is controlled according to needs when the scale remover is used. The polyhydroxy compound and the metal ion chelating agent are used as key components for removing manganese, aluminum, iron, calcium scale and the like deposited on the inner wall of the titanium pipe of the condenser, the corrosion and scale inhibitor can effectively prevent the chemical corrosion, the electrochemical corrosion, the intergranular corrosion and other local corrosion damages of the titanium pipe, and meanwhile, the scale inhibitor provided by the invention can also reduce the pollution to the environment.)

1. The utility model provides a condenser titanium pipe inner wall detergent which characterized in that: the descaling agent for the inner wall of the titanium tube of the condenser comprises 5.0-30% by mass of polyhydroxy compound, 5.0-15% by mass of corrosion and scale inhibitor, 1.0-10% by mass of metal ion chelating agent and the balance of deionized water.

2. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 1, wherein the descaling agent comprises: the descaling agent for the inner wall of the titanium tube of the condenser consists of 10 mass percent of polyhydroxy compound, 10 mass percent of corrosion and scale inhibitor, 3.0 mass percent of metal ion chelating agent and 77 mass percent of deionized water.

3. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 1 or 2, wherein the descaling agent comprises: the polyhydroxy compound is one or more of ascorbic acid, sodium ascorbate and sodium gluconate.

4. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 1 or 2, wherein the descaling agent comprises: the corrosion and scale inhibitor is one or a mixture of more than two of hexamethylenetetramine, sodium dodecyl benzene sulfonate and sodium gluconate.

5. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 3, wherein the descaling agent comprises the following components in percentage by weight: the corrosion and scale inhibitor is one or a mixture of more than two of hexamethylenetetramine, sodium dodecyl benzene sulfonate and sodium gluconate.

6. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 1, 2 or 5, wherein the descaling agent comprises the following components in percentage by weight: the metal ion chelating agent is one or a mixture of more than two of ethylenediamine tetraacetic acid, sodium ethylenediamine tetracetate and citric acid.

7. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 3, wherein the descaling agent comprises the following components in percentage by weight: the metal ion chelating agent is one or a mixture of more than two of ethylenediamine tetraacetic acid, sodium ethylenediamine tetracetate and citric acid.

8. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 4, wherein the descaling agent comprises the following components in percentage by weight: the metal ion chelating agent is one or a mixture of more than two of ethylenediamine tetraacetic acid, sodium ethylenediamine tetracetate and citric acid.

9. The descaling agent for the inner wall of the titanium tube of the condenser according to the claim 1, 2, 5, 7 or 8, wherein the descaling agent comprises the following components in percentage by weight: when the descaling device is used, the descaling temperature is controlled to be 20-45 ℃.

10. The descaling agent for the inner wall of the titanium tube of the condenser according to claim 3, wherein the descaling agent comprises the following components in percentage by weight: when the descaling device is used, the descaling temperature is controlled to be 20-45 ℃.

Technical Field

The invention belongs to the technical field of descaling, and particularly relates to a descaling agent for the inner wall of a titanium tube of a condenser.

Background

As heat exchange equipment commonly used in nuclear power industry, the condenser usually forms compact hard scale on the inner wall of a cooling water pipe in the operation process, so that the thermal resistance is increased, the heat exchange efficiency of the cooling water pipe is reduced, the cooling effect is poor, meanwhile, the problems of scale corrosion and the like are easily caused (Oudenming, the ambitious right, the innovative research and application of chemical cleaning of a titanium pipe of a steam turbine condenser, Guangdong electric power, 2016, 29(9), 27-31.); and different nuclear power plants are located in different regions, and the used circulating cooling seawater has different metal elements, so that the generated scaling components are different, for example, some nuclear power plants use seawater containing more manganese elements as a cooling medium, the scaling of a condenser mainly comprises oxides or carbonates of manganese, aluminum, iron, calcium and the like, and higher requirements are provided for chemical cleaning formula compositions such as acidity, corrosion resistance and whether the discharge of cleaning liquid can cause environmental pollution.

Therefore, there is a need to research an environment-friendly seawater scale remover for the inner wall of a titanium tube of a condenser of a nuclear power plant, which can save cost and does not influence the environment, and the treated solution can treat wastewater containing metal ions and a small amount of radioactive substances.

Disclosure of Invention

In order to effectively solve the problems in the background art, the invention provides a seawater scale remover for the inner wall of a titanium pipe of a condenser of a nuclear power station, which can remove scale on the inner wall surface of used equipment, reduce new corrosion and reduce environmental pollution.

The technical scheme of the invention is as follows:

the descaling agent for the inner wall of the titanium tube of the condenser comprises the following raw material components: polyhydroxy compound, corrosion and scale inhibitor and metal ion chelating agent.

The weight percentage of each raw material component is as follows: 5.0 to 30 percent of polyhydroxy compound, 5.0 to 15 percent of corrosion and scale inhibitor, 1.0 to 10 percent of metal ion chelating agent and the balance of deionized water.

Preferably: 10% of polyhydroxy compound, 10% of corrosion and scale inhibitor, 3.0% of metal ion chelating agent and 77% of deionized water.

The polyhydroxy compound and the metal ion chelating agent are used as key components for removing manganese, aluminum, iron, calcium scale and the like deposited on the inner wall of the titanium tube of the condenser; wherein the polyhydroxy compound is one or more of ascorbic acid, sodium ascorbate and sodium gluconate; the metal ion chelating agent is one or more of ethylenediamine tetraacetic acid, sodium ethylenediamine tetraacetic acid and citric acid.

The corrosion and scale inhibitor can effectively prevent local corrosion damage such as chemical corrosion, electrochemical corrosion, intergranular corrosion and the like of a titanium tube, and is composed of one or more than two of hexamethylenetetramine, sodium dodecyl benzene sulfonate and sodium gluconate.

When the descaling device is used, the descaling temperature is controlled to be 20-45 ℃.

Compared with the prior art, the invention has the beneficial effects that:

1. the formula of the scale remover does not contain raw materials with strong acidity and alkalinity, has good removal capability on manganese, aluminum, iron, calcium and the like deposited on the inner wall of the titanium tube of the condenser, can not damage the inner wall of the titanium tube of the condenser after long-term use, can achieve the effect of removing seawater scale, and can protect the titanium tube from corrosion;

2. the descaling agent disclosed by the invention can well achieve the purpose of removing scales on the inner wall of the titanium pipe of the condenser, and can ensure that the inner wall of the titanium pipe is not scaled for a long time;

3. the scale remover disclosed by the invention is reasonable in formula proportion, simple to prepare, good in removal effect and strong in applicability.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below with reference to examples to facilitate understanding of the skilled person.

Example 1

The scale inhibitor consists of 10 percent of sodium ascorbate, 15 percent of sodium gluconate scale inhibitor, 5.0 percent of ethylenediamine tetraacetic acid metal ion chelating agent and deionized water according to mass percentage.

200mL of the scale remover of the embodiment is taken to soak a sample of a sample tube with seawater scale at room temperature for 20 hours, and the scale removal rate of the sample of seawater scale after the soaking is 98%. The corrosion indicator sheet for the stainless steel and the copper rod has no pitting corrosion, and the corrosion indicator sheet and the loading stress sample can not observe intercrystalline corrosion and stress corrosion under a metallographic microscope of 500 times.

Example 2

The scale inhibitor consists of 15 percent of sodium ascorbate, 5 percent of sodium gluconate scale inhibitor, 2.0 percent of sodium ethylene diamine tetracetate metal ion chelating agent and deionized water according to mass percentage.

200mL of the scale remover of the embodiment is taken to soak a sample tube with seawater scale for 20 hours at room temperature, and the scale removal rate of the sample piece with seawater scale after the soaking is finished is 97%. The corrosion indicator sheet for the stainless steel and the copper rod has no pitting corrosion, and the corrosion indicator sheet and the loading stress sample can not observe intercrystalline corrosion and stress corrosion under a metallographic microscope of 500 times.

Example 3

The scale inhibitor consists of 10 percent of ascorbic acid, 10 percent of sodium gluconate scale inhibitor, 3.0 percent of sodium ethylene diamine tetracetate metal ion chelating agent and deionized water according to mass percentage.

200mL of the scale remover of the embodiment is taken to soak a sample of a sample tube with seawater scale at room temperature for 20 hours, and the scale removal rate of the sample of seawater scale after the soaking is 99%. The corrosion indicator sheet for the stainless steel and the copper rod has no pitting corrosion, and the corrosion indicator sheet and the loading stress sample can not observe intercrystalline corrosion and stress corrosion under a metallographic microscope of 500 times.

Example 4

The scale inhibitor consists of 5 percent of ascorbic acid, 10 percent of sodium gluconate scale inhibitor, 1.0 percent of sodium ethylene diamine tetracetate metal ion chelating agent and deionized water according to mass percentage.

200mL of the scale remover of the embodiment is taken to soak a sample of a sample tube with seawater scale for 24 hours at room temperature, and the scale removal rate of the sample of seawater scale after the soaking is 96%. The corrosion indicator sheet for the stainless steel and the copper rod has no pitting corrosion, and the corrosion indicator sheet and the loading stress sample can not observe intercrystalline corrosion and stress corrosion under a metallographic microscope of 500 times.

Example 5

The scale inhibitor consists of 30 percent of ascorbic acid, 10 percent of sodium gluconate scale inhibitor, 10 percent of sodium ethylene diamine tetracetate metal ion chelating agent and deionized water according to mass percentage.

200mL of the scale remover of the embodiment is taken to soak a sample of a sample tube with seawater scale for 12 hours at room temperature, and the scale removal rate of the sample of seawater scale after the soaking is 99%. The corrosion indicator sheet for the stainless steel and the copper rod has no pitting corrosion, and the corrosion indicator sheet and the loading stress sample can not observe intercrystalline corrosion and stress corrosion under a metallographic microscope of 500 times.