CN111233178A - Phosphorus-free composite cylinder cleaning agent for low-pressure boiler and preparation method thereof - Google Patents
Phosphorus-free composite cylinder cleaning agent for low-pressure boiler and preparation method thereof Download PDFInfo
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- CN111233178A CN111233178A CN202010121888.XA CN202010121888A CN111233178A CN 111233178 A CN111233178 A CN 111233178A CN 202010121888 A CN202010121888 A CN 202010121888A CN 111233178 A CN111233178 A CN 111233178A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
- C23F11/181—Nitrogen containing compounds
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
- C23F11/185—Refractory metal-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/12—Prevention of foaming
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a phosphorus-free composite cylinder cleaning agent for a low-pressure boiler and a preparation method thereof, belonging to the field of boiler water treatment, wherein the product of the phosphorus-free composite cylinder cleaning agent comprises a deoxidant component, a corrosion inhibitor component, a scale inhibitor component, a pH stabilizer component and the like, and the weight percentages of the components are as follows: the oxygen scavenger comprises the following components: 5% -20%, corrosion inhibitor component: 1-10%, scale inhibitor component: 0.1% -10%, pH stabilizer component: 0.1 to 10 percent of the total weight of the raw materials and the balance of pure water, and is prepared by compounding according to specific steps. The invention has simple production process, and the product is widely suitable for low-pressure steam boilers and hot water boilers with the water supplement of pure water, softened water and common tap water. The product of the invention is added into boiler make-up water, which can eliminate the dissolved oxygen corrosion of feed water and play a role of slow release scale inhibition in boiler water, and meanwhile, the specific neutralization amine component can also effectively solve the corrosion problem of condensed water end, thus providing a barrel type water treatment solution for low pressure boilers, and the product is phosphorus-free, environment-friendly, safe and efficient.
Description
Technical Field
The invention belongs to the field of boiler water treatment, and particularly relates to a phosphorus-free composite cylinder cleaning agent for a low-pressure boiler system and a preparation method thereof.
Background
Boilers with pressure lower than 2.5MPa are called low-pressure boilers, and the low-pressure boilers are widely used in daily production and life due to the characteristics of low cost investment, convenience in use, easiness in control and the like.
Boiler water treatment is an important work in the boiler operation process, and the safe operation of the boiler can be seriously influenced by improper water treatment. Improper treatment of dissolved oxygen in feedwater can cause boiler oxygen to corrode, improper treatment of boiler water can cause boiler furnace tube scale deposit and corruption, improper treatment of steam and comdenstion water can cause the condensate water pipeline to corrode rust scheduling problem, these problems then cause boiler water quality to worsen lightly, the blowdown increase, the heat transfer is obstructed, then heavily corrodes the booster, explosion accident even, seriously influences daily safety.
At present, aiming at the water treatment of a low-pressure boiler, a water supply thermal deoxidization and chemical deoxidization combined deoxidization mode is mostly adopted, water supply is added with ammonia water to stabilize the pH value, furnace water is added with phosphorus-containing chemicals such as inorganic phosphate or organic phosphate to control scaling, although corrosion and scaling control can be realized to a certain extent, the operation is complex by adding multiple agents in multiple point positions, the phosphorus-containing chemicals can cause the eutrophication problem of subsequent sewage water bodies, the volatility and the irritation of the ammonia water can cause potential personal injury, the corrosion control capability of the condensed water pipeline is limited, the iron content of the condensed water is high, and the condensed water cannot be directly recovered and the like. Therefore, it is necessary to develop an environment-friendly phosphorus-free composite cylinder cleaning agent for low-pressure boilers, and to realize one-barrel solution of the problems of low-pressure boiler deoxidization, corrosion and scale inhibition and condensate water corrosion control.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to develop a phosphorus-free composite cylinder cleaning agent for a low-pressure boiler, and a barrel type product realizes the control of the low-pressure boiler on oxygen removal, corrosion and scale inhibition and condensed water corrosion.
The technical scheme of the invention is as follows:
a phosphorus-free composite cylinder cleaning agent for a low-pressure boiler comprises the following components in percentage by weight: the oxygen scavenger comprises the following components: 5% -20%, corrosion inhibitor component: 1-10%, scale inhibitor component: 0.1% -10%, pH stabilizer component: 0.1 to 10 percent of water, and the balance of pure water.
Preferably, the composite cylinder cleaning agent comprises the following components in percentage by weight: the oxygen scavenger comprises the following components: 6-15%, corrosion inhibitor component: 3-8%, scale inhibitor component: 0.5% -8%, pH stabilizer component: 0.5 to 8 percent of water, and the balance of pure water.
Preferably, the oxygen scavenger component is an inorganic oxygen scavenger or an organic oxygen scavenger, the inorganic oxygen scavenger is sodium sulfite or sodium bisulfite, and the organic oxygen scavenger is carbohydrazide.
Preferably, the corrosion inhibitor component is one of sodium nitrite and sodium molybdate.
Preferably, the scale inhibitor component is one or more of polyacrylic acid, sodium polyacrylate, polymethacrylic acid and sodium polymethacrylate.
Preferably, the pH stabilizer component is a mixture of solid alkali and neutralized amine, wherein the solid alkali is potassium hydroxide for stabilizing the pH of the furnace water, and the neutralized amine is morpholine or cyclohexylamine for stabilizing the pH of the feed water and steam condensate water, and simultaneously inhibiting the corrosion of condensate water pipes.
The deoxidant component is provided with two selection schemes of an inorganic deoxidant and an organic deoxidant, the cost of selecting inorganic deoxidant sulfite is low, and the deoxidant effect is not limited by the temperature of water supply; the organic deoxidant carbohydrazide is selected, although the water supply temperature needs to reach more than 80 ℃, salt is not contributed, and the boiler pollution discharge can be effectively reduced. The formula can be selected and matched according to the requirements of specific situations on site.
The corrosion inhibitor component is selected from inorganic corrosion inhibitors such as sodium nitrite or sodium molybdate and the like, so that the high-temperature environment in the boiler can be better endured, the reduction of the slow release effect and the large replenishment of the corrosion inhibitor caused by the decomposition of the medicament can be effectively reduced, and the quality of steam is not influenced.
The components of the scale inhibitor adopt polyacrylic acid, polymethacrylic acid or sodium salt thereof, belong to high molecular polymers, are phosphorus-free and environment-friendly, have strong temperature resistance, keep stable scale inhibition effect at the high temperature of 300 ℃, have small contribution to the salinity of the boiler, can realize high-rate concentration of boiler water, and effectively reduce the pollution discharge of the boiler. Has strong dispersion capability to metal oxide and has outstanding effect on preventing the deposition and scaling of the metal oxide.
The pH stabilizer is matched by solid alkali and neutralizing amine (organic alkali), wherein solid alkali potassium hydroxide is kept in furnace water to stabilize the pH of the furnace water and prevent acid corrosion in the furnace, the organic neutralizing amine volatilizes together with steam, a monomolecular adsorption layer is formed on the surface of a pipeline to neutralize the steam and acid gases such as CO2 in condensed water and improve the pH value of the condensed water, so that a steam and condensed water system is effectively protected from being corroded.
[ reaction formula: RNH2+ H2CO3 → RNH3+ + HCO3- ]
The preparation method for preparing the phosphorus-free composite cylinder cleaning agent for the low-pressure boiler comprises the following steps: firstly, adding pure water with a certain formula proportion into a reaction kettle, heating to 35 ℃, then sequentially adding a deoxidant component, a corrosion inhibitor component, a scale inhibitor component and a pH stabilizer component with corresponding formula proportions, and stirring for 30-60 min to completely dissolve the components, thereby obtaining the low-pressure boiler phosphorus-free composite cylinder cleaning agent.
The invention has the beneficial effects that:
the product of the invention provides a one-barrel scheme for solving the problems of deoxidization, corrosion and scale inhibition and condensate water corrosion control of a low-pressure boiler, and the product can be added at one point, is convenient to use and is simple to operate and control.
The invention is phosphorus-free and environment-friendly, the scale inhibition components of polyacrylic acid, sodium polyacrylate, polymethacrylic acid or sodium polymethacrylate are completely phosphorus-free, the scale inhibition capability is strong, the temperature resistance is good, the invention can adapt to high-temperature furnace water environment, and the environmental protection problems of water eutrophication of phosphorus-containing products and the like are effectively eliminated.
The invention can control the corrosion of the boiler by dissolved oxygen, and can control the corrosion of a water supply system, a boiler water system and a steam condensate water system, and the control of the boiler corrosion is all-round. The ammonia water is replaced by the neutralized amine, so that the method is safer and more reliable.
The product of the invention has little contribution to the salt content of the boiler, can reduce boiler pollution discharge caused by salt accumulation of the medicament, improves the concentration multiple of the boiler, and has more advantages of energy conservation and emission reduction compared with the conventional medicament.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
a phosphorus-free composite cylinder cleaning agent for a low-pressure boiler and a preparation method thereof are disclosed, wherein the composite cylinder cleaning agent comprises the following raw material components in percentage by weight:
sodium sulfite: 11.5%, sodium nitrite: 4.5%, polyacrylic acid: 3.3%, potassium hydroxide: 1.5%, morpholine: 6%, pure water: 73.2 percent.
The preparation process comprises the following steps: preparing a stirring reaction kettle, firstly adding pure water with a certain formula proportion into the reaction kettle, heating to 35 ℃, then sequentially adding an oxygen scavenger component, a corrosion inhibitor component, a scale inhibitor component and a pH stabilizer component with a corresponding formula proportion, and stirring for 30-60 min to completely dissolve the components to prepare the phosphorus-free composite cylinder cleaning agent for the low-pressure boiler.
The product of the embodiment is applied to a low-pressure boiler with the pressure of 0.8Mpa at 6t/h, the feed amount is 60ppm under the condition that the feed water temperature is 80 ℃, the dissolved oxygen of the feed water can be controlled to be less than 50ppb, the scale inhibition rate in the boiler reaches 99.9 percent, the problems of caustic corrosion and electrochemical corrosion of boiler water are completely eliminated, and the problem of acid gas corrosion of a steam condensation system is eliminated.
Example 2:
a phosphorus-free composite cylinder cleaning agent for a low-pressure boiler and a preparation method thereof are disclosed, wherein the composite cylinder cleaning agent comprises the following raw material components in percentage by weight:
sodium bisulfite: 10%, sodium molybdate: 5%, polyacrylic acid: 1.5%, polymethacrylic acid: 1.5%, potassium hydroxide: 1.5%, morpholine: 6%, pure water: 69.5 percent.
The preparation method, application method and test method are the same as in example 1.
Tests show that the addition amount of the water-soluble oxygen-soluble scale inhibitor can reach a qualified level under the condition of 75 ppm.
Example 3:
a phosphorus-free composite cylinder cleaning agent for a low-pressure boiler and a preparation method thereof are disclosed, wherein the composite cylinder cleaning agent comprises the following raw material components in percentage by weight:
carbohydrazide: 9%, sodium nitrite: 5%, sodium polymethacrylate: 3.8%, potassium hydroxide: 1.0%, morpholine: 7%, pure water: 77.2 percent.
The preparation method, application method and test method are the same as in example 1.
The tested water supply temperature is 95 ℃, and the dosage of the water supply agent is 50ppm, so that the dissolved oxygen, the scale inhibition and the corrosion inhibition can reach the qualified level. Meanwhile, the electrical conductivity in the boiler is reduced by more than 50% compared with that of an inorganic deoxidant, and the boiler exhaust emission can be obviously reduced.
Claims (8)
1. The phosphorus-free composite cylinder cleaning agent for the low-pressure boiler is characterized by comprising the following components in percentage by weight: the oxygen scavenger comprises the following components: 5% -20%, corrosion inhibitor component: 1-10%, scale inhibitor component: 0.1% -10%, pH stabilizer component: 0.1 to 10 percent of water, and the balance of pure water.
2. The phosphorus-free composite cylinder cleaning agent for the low-pressure boiler according to claim 1, which is characterized by comprising the following components in percentage by weight: the oxygen scavenger comprises the following components: 6-15%, corrosion inhibitor component: 3-8%, scale inhibitor component: 0.5% -8%, pH stabilizer component: 0.5 to 8 percent of water, and the balance of pure water.
3. The phosphorus-free composite cylinder cleaning agent for the low-pressure boiler as claimed in claim 2, wherein the oxygen scavenger component is an inorganic oxygen scavenger or an organic oxygen scavenger.
4. The phosphorus-free composite cylinder cleaning agent deoxidizing component of a low pressure boiler as claimed in claim 3, wherein the inorganic deoxidant is sodium sulfite or sodium bisulfite, and the organic deoxidant is carbohydrazide.
5. The phosphorus-free composite cylinder cleaning agent for the low-pressure boiler according to claim 2, wherein the corrosion inhibitor component is one of sodium nitrite and sodium molybdate.
6. The phosphorus-free composite cylinder cleaning agent for the low-pressure boiler according to claim 2, wherein the scale inhibitor component is one or more of polyacrylic acid, sodium polyacrylate, polymethacrylic acid and sodium polymethacrylate.
7. The phosphorus-free composite cylinder cleaning agent for the low-pressure boiler according to claim 2, wherein the pH stabilizer component is a mixture of solid alkali and neutralized amine, wherein the solid alkali is potassium hydroxide, and the neutralized amine is morpholine or cyclohexylamine.
8. The method for preparing the phosphorus-free composite cylinder cleaning agent for the low-pressure boiler according to claim 1 is characterized by comprising the following steps of:
firstly, adding pure water with a certain formula proportion into a reaction kettle, heating to 35 ℃, then sequentially adding a deoxidant component, a corrosion inhibitor component, a pH stabilizer component and a scale inhibitor component with a corresponding formula proportion, and stirring for 30-60 min to completely dissolve the components to prepare the phosphorus-free composite cylinder cleaning agent for the low-pressure boiler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010121888.XA CN111233178A (en) | 2020-02-27 | 2020-02-27 | Phosphorus-free composite cylinder cleaning agent for low-pressure boiler and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010121888.XA CN111233178A (en) | 2020-02-27 | 2020-02-27 | Phosphorus-free composite cylinder cleaning agent for low-pressure boiler and preparation method thereof |
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| CN111233178A true CN111233178A (en) | 2020-06-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112694951A (en) * | 2020-12-03 | 2021-04-23 | 嘉兴沃特泰科环保科技股份有限公司 | Non-phosphoric acid series medium and low pressure boiler cleaning agent and preparation method thereof |
| CN112939282A (en) * | 2021-02-22 | 2021-06-11 | 山西太钢不锈钢股份有限公司 | Method for adjusting water supply conductivity |
| CN116874095A (en) * | 2023-09-06 | 2023-10-13 | 杭州尚善若水环保科技有限公司 | Phosphorus-free mixture for boiler shutdown protection and daily operation dosing treatment |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112694951A (en) * | 2020-12-03 | 2021-04-23 | 嘉兴沃特泰科环保科技股份有限公司 | Non-phosphoric acid series medium and low pressure boiler cleaning agent and preparation method thereof |
| CN112939282A (en) * | 2021-02-22 | 2021-06-11 | 山西太钢不锈钢股份有限公司 | Method for adjusting water supply conductivity |
| CN116874095A (en) * | 2023-09-06 | 2023-10-13 | 杭州尚善若水环保科技有限公司 | Phosphorus-free mixture for boiler shutdown protection and daily operation dosing treatment |
| CN116874095B (en) * | 2023-09-06 | 2023-12-15 | 杭州尚善若水环保科技有限公司 | Phosphorus-free mixture for boiler shutdown protection and daily operation dosing treatment |
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