阅读说明：本技术 一种用于钢铁厂高炉循环冷却水系统不停车清洗的清洗剂 (Cleaning agent for non-stop cleaning of blast furnace circulating cooling water system in steel plant ) 是由 刘黄英 黄进生 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种用于钢铁厂高炉循环冷却水系统不停车清洗的清洗剂,包含A组分和B组分；A组分为：质量浓度为50％的渗透剂JFC(脂肪醇聚氧乙烯醚)；B组分为：氨基三甲叉磷酸四钠(ATMP.Na4)7％、己二胺四甲叉磷酸钾盐(HMDTMPA.K6)15％、二乙烯三胺五甲叉磷酸七钠(DTPMP.Na7)10％、聚丙烯酸钠10％和水58％。本发明清洗剂pH值为6.5-7.5,属于偏中性,对金属无腐蚀,不会引起循环水水质pH值的剧烈波动变化,给循环冷却水系统的在线清洗提供了安全的保障,本发明清洗剂使用浓度较低,循环水的排放符合环保要求,清洗后的循环水不需要经过专门的pH值调节即可正常排放。(The invention discloses a cleaning agent for non-stop cleaning of a blast furnace circulating cooling water system in a steel plant, which comprises a component A and a component B; the component A is as follows: a penetrant JFC (fatty alcohol-polyoxyethylene ether) with the mass concentration of 50%; the component B is as follows: 7% of amino trimethylene phosphate tetrasodium (ATMP. Na4), 15% of hexamethylene diamine tetramethylidene phosphate potassium salt (HMDTMPA. K6), 10% of diethylene triamine pentamethylene phosphate heptasodium (DTPMP. Na7), 10% of sodium polyacrylate and 58% of water. The pH value of the cleaning agent is 6.5-7.5, the cleaning agent is neutral, has no corrosion to metal, can not cause the drastic fluctuation change of the pH value of the water quality of circulating water, and provides a safe guarantee for the online cleaning of a circulating cooling water system.)

1. A cleaning agent for non-stop cleaning of a blast furnace circulating cooling water system in a steel plant is characterized by comprising a component A and a component B;

the component A comprises the following raw materials in percentage by mass: a penetrant JFC (fatty alcohol-polyoxyethylene ether) with the mass concentration of 50%;

the component B comprises the following raw materials in percentage by mass: 7% of amino trimethylene phosphate tetrasodium (ATMP. Na4), 15% of hexamethylene diamine tetramethylidene phosphate potassium salt (HMDTMPA. K6), 10% of diethylene triamine pentamethylene phosphate heptasodium (DTPMP. Na7), 10% of sodium polyacrylate and 58% of water.

2. The cleaning agent according to claim 1, wherein: the mass concentration of the amino trimethylene sodium phosphate (ATMP. Na4) is 30%, the mass concentration of the hexamethylene diamine tetramethylene potassium phosphate (HMDTMPA. K6) is 23%, the mass concentration of the diethylene triamine pentamethylene sodium phosphate (DTPMP. Na7) is 32%, and the mass concentration of the sodium polyacrylate is 30%.

3. A method for cleaning a blast furnace circulating cooling water system of an iron and steel plant without stopping by using the cleaning agent as defined in claim 1 or 2, which is characterized by comprising the following operation steps:

(1) adding a cleaning agent into a circulating cooling water system, adding a cleaning agent A component at first, adding a cleaning agent B component at intervals, normally supplementing water and draining after closing the system, continuing to add the cleaning agent A component according to the daily system water supplement amount and concentration multiple, adding the cleaning agent B component at intervals, circularly cleaning, and controlling the pH value to be 6.5-7.5 in the whole process;

(2) after the cleaning is finished, the water is drained and replaced, the turbidity of the circulating water is less than or equal to 10NTU, and the total iron is less than or equal to 1.0 mg/L.

4. The method of claim 3, wherein: in the step (1), the input amount of the component A of the cleaning agent is that 20mg of the component A is input into every 1L of water in the system, and the input amount of the component B of the cleaning agent is that 600mg of the component B is input into every 1L of water in the system.

5. The method of claim 3, wherein: in the step (1), the detergent A component is added in an amount of supplementing water per 1L of the system (20 divided by concentration multiple), and the detergent B component is added in an amount of supplementing water per 1L of the system (600 divided by concentration multiple) after a period of time.

6. The method of claim 3, wherein: adding the component B of the cleaning agent after the interval of 30min in the step (1); normally replenishing and draining water after closing the water replenishing and draining system for 24 hours in the step (1); and (2) adding the component B of the cleaning agent after a period of time in the step (1), and circularly cleaning for 25 days.

Technical Field

The invention relates to a cleaning agent, in particular to a cleaning agent for cleaning a circulating cooling water system of a blast furnace in a steel plant without stopping.

Background

At present, a blast furnace of a steel plant is cleaned by adopting a parking off-line pickling mode to clean various dirt such as calcium carbonate, calcium sulfate, calcium silicate and the like, metal corrosion products, microorganism slime, solid suspended substance impurities and the like attached to a cooling wall of a blast furnace body. The cleaning mode needs the blast furnace to be stopped and is externally connected with a circulating pipeline and a cleaning tank, the process is complex, and the use is inconvenient. The pH value of the used medicament is acidic, the pH value of the pickling is lower, the pickling has stronger corrosion to metal, inevitable corrosion phenomena exist on a cleaned object, potential construction safety hazards exist, and the requirement on the service level of an operator is higher. Off-line cleaning is usually only to clean the cooling wall of the blast furnace body and the water inlet and outlet pipes at the joint, and the cooling tower packing cannot be taken into consideration for the whole set of system circulating pipeline and the cooling tower.

Disclosure of Invention

Aiming at the defects of the existing cleaning process and the acidic cleaning agent, the invention provides the cleaning agent for cleaning the blast furnace in the steel plant without stopping, the pH value of the cleaning agent is 6.5-7.5, the cleaning agent has no corrosivity to metals, and the cleaning agent can quickly permeate, peel and dissolve dirt, slime and insoluble solid particles attached to the cooling wall of the blast furnace, the circulating pipeline, the pool wall of the cooling tower and the filler of the cooling tower, so that the circulating cooling water system is recovered to be clean, the heat exchange efficiency is improved, and the potential safety hazard is reduced.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a cleaning agent for non-stop cleaning of a blast furnace circulating cooling water system in a steel plant comprises a component A and a component B;

the component A comprises the following raw materials in percentage by mass: a penetrant JFC (fatty alcohol-polyoxyethylene ether) with the mass concentration of 50%;

the component B comprises the following raw materials in percentage by mass: 7% of amino trimethylene phosphate tetrasodium (ATMP. Na4), 15% of hexamethylene diamine tetramethylidene phosphate potassium salt (HMDTMPA. K6), 10% of diethylene triamine pentamethylene phosphate heptasodium (DTPMP. Na7), 10% of sodium polyacrylate and 58% of deionized water.

Preferably, the mass concentration of the amino trimethylene phosphate tetrasodium (atmp. na4) is 30%, the mass concentration of the hexamethylene diamine tetramethylene phosphate potassium salt (hmdtmpa. k6) is 23%, the mass concentration of the diethylene triamine pentamethylene phosphate heptasodium (dtpmp. na7) is 32%, and the mass concentration of the sodium polyacrylate is 30%.

The method for cleaning the blast furnace circulating cooling water system of the steel plant by adopting the cleaning agent without stopping the vehicle comprises the following operation steps:

(1) adding a cleaning agent into a water-cooling tower collecting tank of a circulating cooling water system, firstly adding a cleaning agent component A, adding a cleaning agent component B after intervals, normally supplementing water and draining after closing the system, continuously adding the cleaning agent component A according to the daily system water supplement amount and concentration multiple, adding the cleaning agent component B after intervals for a period of time, circularly cleaning, and controlling the pH value to be 6.5-7.5 in the whole process;

(2) after the cleaning is finished, the water is drained and replaced, the turbidity of the circulating water is less than or equal to 10NTU, and the total iron is less than or equal to 1.0 mg/L.

Preferably, the dosage of the cleaning agent A component in the step (1) is 20mg of the A component in each 1L of water in the system, and the dosage of the cleaning agent B component is 600mg of the B component in each 1L of water in the system.

Preferably, in step (1), the detergent A component is added in an amount of water supplemented to the system of every 1L (20 ÷ concentration times), and the detergent B component is added in an amount of water supplemented to the system of every 1L (600 ÷ concentration times) at intervals.

Preferably, the component B of the cleaning agent is added after the interval of the step (1) is 30 min; normally replenishing and draining water after closing the water replenishing and draining system for 24 hours in the step (1); and (2) adding the component B of the cleaning agent after a period of time in the step (1), and circularly cleaning for 25 days.

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

the pH value of the cleaning agent is 6.5-7.5, the cleaning agent is neutral, has no corrosion to metal, can not cause the drastic fluctuation change of the pH value of the water quality of circulating water, and provides a safe guarantee for the online cleaning of a circulating cooling water system.

Detailed Description

The following detailed description is to be read in connection with specific embodiments, but it should be understood that the scope of the invention is not limited to the specific embodiments. The raw materials and reagents used in the examples were all commercially available unless otherwise specified. The mass concentration of tetrasodium aminotrimethylene phosphate (atmp. na4) used in the examples was 30%, the mass concentration of potassium hexamethylenediamine tetramethylenephosphate (hmdtmpa. k6) was 23%, the mass concentration of heptasodium diethylenetriamine pentamethylenephosphate (dtpmp. na7) was 32%, and the mass concentration of sodium polyacrylate was 30%.

The blast furnace circulating cooling water system in the embodiment comprises a circulating cooling water system (1) and a circulating cooling water system (2); circulating water volume 8710m of circulating cooling water system (1)³H, water retention capacity 8100m³720m of make-up water³The concentration multiple (K) is 2.0 times, and the system materials are carbon steel and stainless steel; circulating cooling water system (2) circulating water quantity of 4800m³Per hour, water retention capacity 4000m³200m of make-up water³And d, the concentration multiple (K) is 2.0 times, and the system is made of carbon steel and stainless steel.

Example 1

A cleaning agent for non-stop cleaning of a blast furnace circulating cooling water system in a steel plant comprises a component A and a component B; wherein the component A is a penetrant JFC (fatty alcohol-polyoxyethylene ether) with the mass concentration of 50%; the component B comprises 7% of raw materials of 7% of amino trimethylene tetra sodium phosphate (ATMP. Na4), 15% of hexamethylenediamine tetra methylene potassium phosphate (HMDTMPA. K6), 10% of diethylene triamine penta methylene hepta sodium phosphate (DTPMP. Na7), 10% of sodium polyacrylate and 58% of deionized water in percentage by mass, and the raw materials are mixed and stirred uniformly to obtain the component B, wherein the solid content range of the obtained component B is 15-20%.

A method for cleaning a blast furnace circulating cooling water system of an iron and steel plant by adopting the cleaning agent without stopping the vehicle comprises the following specific operation steps:

(1) at the place where the flow rate of water at the inlet of the water collecting tank is fast, adding 20mg of a cleaning agent A component into a water cooling tower collecting tank of a circulating cooling water system according to the water quantity kept by the system (about 0.175 ton of the system (1)) into every 1L of water in the system, adding 600mg of a cleaning agent B component into every 1L of water in the system (about 5.0 ton of the system (1)) after every 30min, after closing the water replenishing and draining of the system, normally replenishing water and draining, adding 10mg of the cleaning agent A component (7.2 kg of the system (1) every day) into every 1L of water replenishing quantity of the system according to the water quantity and concentration multiple of the system every day, namely adding 300mg of the cleaning agent B component (216 kg of the system (1) every day) into every 1L of water replenishing quantity after 30min, circularly cleaning for 25 days, and controlling the pH value to be between 6.5 and 7.5 in the whole process; analyzing and recording pH, calcium ions, turbidity and total iron in the cleaning process, and determining that a chemical cleaning end point is reached when the turbidity of the system and the concentration of the total iron change from low to high and finally tend to be stable and the pH value is relatively stable, namely, cleaning is finished;

the water quality analysis monitoring items and frequencies during washing are shown in table 1:

table 1.

Monitoring items	Frequency of	Cleaning process	Cleaning end point	Endpoint of replacement
					pH value	1 time/6 h	6.5-7.5	--	—
Calcium ion	1 time per day	—	Stationary for 48 hours	—
					Total iron	1 time per day	—	Stationary for 48 hours	＜1.0mg/l
Turbidity of water	1 time per day	—	——	＜10NTU

Note: depending on the circumstances, the frequency of project analysis may be increased.

(2) After cleaning, draining and replacing to ensure that the turbidity of circulating water is less than or equal to 10NTU and the total iron is less than or equal to 1.0 mg/L; after the cleaning is finished, a mode of draining and replenishing water while draining is adopted, and then normal operation control can be switched in until the machine is shut down.

Example 2

A cleaning agent for non-stop cleaning of a blast furnace circulating cooling water system in a steel plant comprises a component A and a component B; wherein, the component A comprises: a penetrant JFC (fatty alcohol-polyoxyethylene ether) with the mass concentration of 50%; the component B comprises the following raw materials in percentage by mass: 7% of amino trimethylene tetra sodium phosphate (ATMP. Na4), 15% of hexamethylene diamine tetra methylene potassium phosphate (HMDTMPA. K6), 10% of diethylene triamine penta methylene hepta sodium phosphate (DTPMP. Na7), 10% of sodium polyacrylate and 58% of deionized water, wherein the raw materials are mixed and stirred uniformly to obtain the component B, and the solid content range of the component B is 15-20%.

A method for cleaning a blast furnace circulating cooling water system of an iron and steel plant by adopting the cleaning agent without stopping the vehicle comprises the following specific operation steps:

(1) at the place where the flow rate of water at the inlet of the water collecting tank is relatively high, adding 20mg of a cleaning agent A component (about 0.075 ton of the cleaning agent A component) into a water collecting tank of a water cooling tower of a step-by-step circulating cooling water system according to a water retaining amount of the system, adding 600mg of a cleaning agent B component (about 2.5 ton of the cleaning agent B component) into the water collecting tank according to 1L of water in the system after every 1L of water in the system is separated by 30min, normally supplementing and draining water after the system is closed for 24h, adding 10mg (20 divided by 2) of the cleaning agent A component (2 kg of the cleaning agent A component) according to a water supplementing amount and a concentration multiple of the system every day, adding 300mg (600 divided by 2) of the cleaning agent B component (60 kg of the system) into the water supplementing amount of the system every 1L of water after the system is separated by 30min, circularly cleaning for 25 days, and controlling the pH value to be between 6.5 and 7.5 in the whole process; analyzing and recording pH, calcium ions, turbidity and total iron in the cleaning process, and determining that a chemical cleaning end point is reached when the turbidity of the system and the concentration of the total iron change from low to high and finally tend to be stable and the pH value is relatively stable, namely, cleaning is finished;

(2) after cleaning, draining and replacing to ensure that the turbidity of circulating water is less than or equal to 10NTU and the total iron is less than or equal to 1.0 mg/L; after the cleaning is finished, a mode of draining and replenishing water while draining is adopted, and then normal operation control can be switched in until the machine is shut down.

The invention is used for the performance test of the cleaning agent for the non-stop cleaning of the blast furnace circulating cooling water system in the iron and steel plant

The physical and chemical properties of the cleaning agent for cleaning the circulating cooling water system of the blast furnace in the steel plant without stopping the blast furnace are shown in the following table 2:

TABLE 2 analysis results of corrosion and scale inhibitor

Second, cleaning agent descaling performance test for non-stop cleaning of blast furnace circulating cooling water system in steel plant

1) The water quality analysis of the untreated water in the blast furnace circulating cooling water system of the above example was carried out, and the results are shown in Table 3:

TABLE 3 Water quality analysis results

Item	Unit of	Index (I)
			Calcium hardness (as CaCO)3Meter)	mg/L	10
Hardness of magnesium (as CaCO)3Meter)	mg/L	5.3
			Total hardness (as CaCO)3Meter)	mg/L	75
Phenol bases (as CaCO)3Meter)	mg/L	0
			Total alkalinity (as CaCO)3Meter)	mg/L	135
Chloride ion (as Cl)-Meter)	mg/L	14
			pH	—	7.54
Electrical conductivity of	μs/cm	123

2) Adding untreated water in a circulating cooling water system of a blast furnace in examples into beakers A1 and A2, adding 500mg/L of solid insoluble scaling substances (the main component is calcium carbonate), then adding 20mg/L of the cleaning agent A component, 600mg/L of the cleaning agent B component and no cleaning agent into a beaker A2 in a beaker A1; putting into a constant temperature water bath kettle at 60 +/-1 ℃, and ensuring the liquid level to be unchanged during the period of time for supplementing distilled water. Measuring the pH value every other hour, and adjusting the pH value of the test water to be between 6.5 and 7.5 by using acid; and taking out the beaker after 72 hours to detect the calcium hardness index in the water, and checking whether the concentration of the dissolved calcium ions in the water is increased or not to determine the descaling performance of the medicament. The results are shown in Table 4:

TABLE 4 results of scale removal experiments

As can be seen from the above table: when the component A in the cleaning agent is 20mg/L and the component B in the cleaning agent is more than 600mg/L, the descaling rate of the agent is more than 90 percent, and the descaling rate requirement specified by a steel plant is met.

Thirdly, the corrosion inhibition performance test of the cleaning agent for non-stop cleaning of the blast furnace circulating cooling water system in the steel plant

The corrosion inhibition performance adopts GB/T18175-2000 'method for measuring the corrosion inhibition performance of a water treatment agent by a rotary corrosion hanging piece method'.

The test procedure was as follows:

1. wiping the test piece with filter paper to remove oil, scrubbing absorbent cotton in n-hexane and anhydrous ethanol (50 mL of the component A and the component B of the cleaning agent is used for each 10 test pieces), drying the test pieces with the filter paper, placing the test pieces in a dryer for more than 4h, weighing the test pieces to be accurate to 0.0001g, and storing the test pieces in the dryer for later use;

2. according to the test requirements, preparing test water (the test water is the water quality after being concentrated in a descaling test, and the water contains a corrosion and scale inhibitor, so that a medicament does not need to be added again);

3. simultaneously hanging carbon steel and stainless steel hanging pieces in different beakers, and simultaneously making a hanging piece without adding a medicament; starting the motor to rotate the test piece at a rotation speed of 90 rpm and starting timing;

4. the beaker is not covered, the test solution is naturally evaporated, and water is replenished once every 4 hours (the water is deionized water), so that the liquid level is kept at the scribed line;

5. the operation time is 72 hours, the test piece stops rotating, and the test piece is taken out and subjected to appearance observation;

6. scrubbing the test piece with a brush, soaking in an acid pickling solution for 3-5 min, taking out, and washing with tap water; then quickly immersing the glass tube into sodium hydroxide solution for about 30 seconds, taking out the glass tube, and washing the glass tube by tap water; wiping with filter paper, sucking, and soaking in anhydrous ethanol for about 3 min; the solution was blotted dry with filter paper, dried for 4 hours or more, and weighed with an analytical balance to 0.0001 g. The results obtained are shown in Table 5:

TABLE 5 Corrosion test results

As can be seen from the above table: when the component A in the cleaning agent is 20mg/L and the component B in the cleaning agent is more than 600mg/L, the corrosion rate of carbon steel is less than 0.075mm/a, and the corrosion rate of stainless steel is less than 0.005mm/a, so that the requirements specified in GB 50050-2017 Industrial circulating Cooling Water treatment design Specification are met.

The component A is a penetrating agent JFC, has an excellent penetrating and wetting effect, can penetrate into dirt and slime to perform a stripping and wetting effect, and is beneficial to penetrating and wetting of the cleaning agent. The component B is formed by mixing an organic phosphorus scale and corrosion inhibition monomer and a phosphorus-free polycarboxylic acid scale and dispersion agent under the stirring process condition that deionized water is used as a solvent, and the coordination of amino tetrasodium trimethyophosphate (ATMP. Na4), hexamethylenediamine tetramethylidene potassium phosphate (HMDTMPA. K6) and diethylenetriamine penta-methylene sodium phosphate (DTPMP. Na7) has the complex solubilization function on hard scales such as main scale carbonate, sulfate, silicate and the like on a cooling wall, so that the solubility of scale forming salt is improved. Under the actions of complexation solubilization and lattice distortion, the scaling substances are peeled off, dispersed and dissolved. The sodium polyacrylate is a scale inhibition and dispersion agent, can promote insoluble solid particles to disperse in water, prevents aggregation and precipitation, and has a synergistic effect by compounding with an organic phosphorus polymer.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.