Scale inhibition agent for waste incineration power plant and adding system
By using a variety of scale inhibitors and anaerobic modifiers in the water system of a waste-to-energy plant, combined with sulfuric acid treatment, the problems of scaling in pipes and anaerobic reactors were solved, achieving water quality stability and improved system efficiency.
Patent Information
- Application Number
- CN202410553552.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-11-07
AI Technical Summary
In the existing water systems of waste-to-energy plants, improper use and ratio of chemicals have led to severe scaling in the pipes, affecting water supply energy consumption, water quality and system efficiency, and making it difficult to effectively inhibit scaling in anaerobic reactors.
A scale inhibitor for waste incineration power plants is used, which includes multiple scale inhibitors and anaerobic modifiers. By adjusting the agent concentration and pH value, combined with sulfuric acid treatment, scaling is inhibited, and anaerobic modifiers are introduced into the system to enhance its resistance to load shocks.
It effectively prevents pipe scaling, improves water quality stability and system efficiency, enhances the performance of the anaerobic reactor, and ensures that it operates under good conditions.
Smart Images
Figure CN120903705A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to power plant scale inhibitor technical field, especially to a kind of waste incineration power plant scale inhibitor and adding system. BACKGROUND
[0002] It is well known that water in the process of flowing in pipe forms pipe corrosion, deposition and scale over time, and its corrosion product deposits in the pipe to form a scale layer-pipe scale. Its thickness is proportional to the service life of the pipeline, and with the increase of time, the effective cross-sectional area of the pipeline is continuously reduced. These pipe scales not only increase the energy consumption of water transport, but also cause chemical reactions with the pipe network water, resulting in the increase of water turbidity and iron content and the sharp reduction of residual chlorine and dissolved oxygen, affecting the water quality. Not only that, this scale layer is also a breeding place for bacteria, which creates a good habitat for various microorganisms, making it easy for biofilm to adhere to the inner wall of the pipe, increasing the biological instability of the pipe network water.
[0003] The existing water system pipeline is caused by unreasonable use of medicament, improper medicament ratio and unsatisfied medicament use conditions, resulting in continuous reduction of effective cross-sectional area of pipe scale, increase of water transport energy consumption, difficulty in normal closing of pipe valve, serious influence on maintenance, local area unable to enter water, low pool capacity utilization, serious influence on system biochemical efficiency, and blockage of system sludge discharge. SUMMARY
[0004] In order to solve the problems in the background art, the present application provides a waste incineration power plant scale inhibitor and adding system which promotes the performance of anaerobic reactor, enhances the ability to resist load impact and ensures the anaerobic reactor in a good running state.
[0005] In view of the problems in the prior art, the present application provides a waste incineration power plant scale inhibitor, which comprises an anaerobic system and a scale inhibitor neutralized in the anaerobic system, and comprises PAM cation, reverse osmosis scale inhibitor, reducing agent, sodium hydroxide, oxidizing bactericide, industrial scale inhibitor, defoaming agent, non-oxidizing bactericide, stripping agent, trisodium phosphate, ammonia, STRO scale inhibitor, STRO acid, STRO alkaline cleaner, nanofiltration scale inhibitor, nanofiltration alkaline, nanofiltration acid cleaner, ultrafiltration alkaline, ultrafiltration acid cleaner, citric acid and sodium hypochlorite. The concentration of the scale inhibitor is 1%-10%, and the concentration of the scale inhibitor is adjusted according to its type and water hardness.
[0006] The application discloses a scale inhibitor adding system for a waste incineration power plant, which comprises a connecting pipe, one end of the connecting pipe is fixedly connected with the outer wall of an anaerobic system, one end of an anaerobic circulating pipe is fixedly connected with the other end of the connecting pipe, one end of a conveying pipe is fixedly connected with the water outlet of a control valve, the control valve is fixedly installed at the lower end of a storage tank, the control valve and the anaerobic system are electrically connected, a liquid inlet is fixedly installed at the upper end of the storage tank, a meter is installed at the connection between the anaerobic system and the connecting pipe, a stirrer is installed behind the connection between the connecting pipe and the anaerobic circulating pipe, a plurality of micro-monitors are fixedly installed in the anaerobic circulating pipe, and the micro-monitors are connected with the anaerobic system module.
[0007] One end of the connecting pipe is fixedly connected with the outer wall of the anaerobic system, one end of the anaerobic circulating pipe is fixedly connected with the other end of the connecting pipe, one end of the conveying pipe is fixedly connected with the water outlet of the control valve, the control valve is fixedly installed at the lower end of the storage tank, the control valve and the anaerobic system are electrically connected, and the liquid inlet is fixedly installed at the upper end of the storage tank.
[0008] Specifically, the water in the cooling system is not only added with scale inhibitors during the treatment process, but also is subjected to composite treatment by adding acid, so as to improve the concentration ratio of the circulating water, and the purpose of adding sulfuric acid to the circulating water of the cooling system is to neutralize the carbonate alkalinity in the water, and the reaction formula is as follows: Ca(HCO3)2+H2SO4→CaSO4+2CO2+2H2O, and after the circulating water of the cooling system is added with sulfuric acid, the solubility product of calcium carbonate will be increased, and the formula is Mg(HCO3)2+H2SO4→MgSO4+2CO2+2H2O.
[0009] Specifically, while the concentration ratio and the content of organic phosphorus of the circulating water of the cooling system are controlled, the JD in the circulating water subjected to acid treatment is controlled to be between 3 and 5, and the pH can be stabilized between 8.7 and 9.0.
[0010] Specifically, an anaerobic modifier adding port and adding equipment are added to the inlet pipeline of the anaerobic system circulating pump, the anaerobic modifier is added to the circulating pipeline at a water flow of 80 ppm concentration, the anaerobic modifier adding port is moved to the anaerobic circulating outlet valve, and the adding proportion is kept unchanged at 100 ppm of the water flow.
[0011] The beneficial effects of the present application: a kind of waste incineration power plant scale inhibitor and adding system of the present application, cooling system in the present application can increase the scale inhibition effect of scale inhibitor by the way of adding acid in small amount and continuously when adjusting the PH value to 8.7-9.0 by sulfuric acid, effectively prevent pipeline equipment from scaling;Anaerobic modifier is first used in leachate system and the concentration ratio is finally successfully adjusted by test and applied in waste incineration plant leachate treatment system, effectively inhibits anaerobic scale speed, reduces anaerobic system cleaning frequency, promotes and strengthens anaerobic reaction process, improves the control of anaerobic reaction hydraulic, water quality, regulation and environmental factors, so as to promote the performance of anaerobic reactor, enhance the ability of load impact, ensure the anaerobic reactor in a benign operation state. BRIEF DESCRIPTION OF DRAWINGS
[0012] The present application will be further described below in conjunction with the drawings and examples.
[0013] Fig. 1 The delivery diagram of anaerobic system and scale inhibitor in the present application;
[0014] Fig. 2 The method operation step diagram of the present application;
[0015] Fig. 3 The connection structure diagram of connecting pipe, meter and stirrer in the present application.
[0016] In the figure: 1, anaerobic system;110, connecting pipe;111, anaerobic circulation pipe;112, delivery pipe;113, control valve;114, storage tank;115, liquid inlet;116, meter;117, stirrer;118, micro monitoring. DETAILED DESCRIPTION
[0017] In order to make the technical method, creative features, purposes and effects realized by the present application easy to understand, the present application will be further described below in conjunction with specific embodiments.
[0018] As Figs. 1-3 shown, a kind of waste incineration power plant scale inhibitor, including anaerobic system 1, scale inhibitor carried out in the anaerobic system 1 Neutralization, scale inhibitor includes PAM cation, reverse osmosis scale inhibitor, reducing agent, sodium hydroxide, oxidizing bactericide, industrial scale inhibitor, defoaming agent, non-oxidizing bactericide, stripping agent, trisodium phosphate, ammonia, STRO scale inhibitor, STRO acid, STRO alkaline cleaning agent, nanofiltration scale inhibitor, nanofiltration alkaline, nanofiltration acid cleaning agent, ultrafiltration alkaline, ultrafiltration acid cleaning agent, citric acid and sodium hypochlorite, the concentration of the scale inhibitor is 1%-10%, the concentration of the scale inhibitor is adjusted according to its type and water hardness,
[0019] The application discloses a kind of waste incineration power plant scale inhibition agent adding system, including connecting pipe 110, one end of the connecting pipe 110 is fixedly connected with the outer wall of anaerobic system 1, one end of the anaerobic circulation pipe 111 is fixedly connected with the other end of connecting pipe 110, one end of the conveying pipe 112 is fixedly connected with the water outlet of control valve 113, the control valve 113 is fixedly installed in the lower end of storage tank 114, the control valve 113 and anaerobic system 1 are electrically connected, the liquid inlet 115 is fixedly installed in the upper end of storage tank 114, the meter 116 is installed in the connection of anaerobic system 1 and connecting pipe 110, the stirrer 117 is installed in the rear of the connection of connecting pipe 110 and anaerobic circulation pipe 111, a plurality of the micro-monitoring 118 is fixedly installed in the inside of anaerobic circulation pipe 111, and the micro-monitoring 118 is connected with anaerobic system 1 module.
[0020] Preferably, the water in the cooling system is not only added with scale inhibitor during treatment, but also treated by adding acid to improve the concentration ratio of circulating water. The purpose of adding sulfuric acid to the circulating water of the cooling system is to neutralize the carbonate alkalinity in the water, and the reaction formula is as follows: Ca(HCO3)2+H2SO4→CaSO4+2CO2+2H2O. After adding sulfuric acid to the circulating water of the cooling system, the solubility product of calcium carbonate will increase, and the formula is Mg(HCO3)2+H2SO4→MgSO4+2CO2+2H2O. While controlling the concentration ratio and the content of organic phosphorus of the circulating water, the JD of the circulating water treated by adding acid is controlled to be between 3 and 5, and the pH can be stabilized between 8.7 and 9.0. An anaerobic modifier adding port and adding equipment are added to the inlet pipeline of the anaerobic circulating pump, and the anaerobic modifier is added to the circulating pipeline at a concentration of 80 ppm based on the water flow. The anaerobic modifier adding port is moved to the anaerobic circulation outlet valve, and the adding ratio is kept unchanged at 100 ppm based on the water flow.
[0021] (1) The effect of scale inhibition is studied for two sets of water systems, which are studied from two aspects of PH condition control and reagent concentration ratio of the reagent.
[0022] The principle of scale formation: scale formation refers to the phenomenon that saturated salt in circulating water is separated and adhered to the surface of equipment. The common scale in the circulating water system is mainly calcium carbonate scale, and the reaction principle is Ca2++CO32-→CaCO3.
[0023] Main factors affecting scale formation:
[0024] (a) Because the solubility of calcium in acid, neutral, weak alkaline medium is reduced with the increase of temperature, that is, its solubility product decreases with the increase of temperature, while the degree of ionization of HCO3- increases with the increase of temperature, that is, the concentration of CO32- gradually increases, although the concentration of Ca2+ decreases with the formation of scale, but the scale formation phenomenon is still gradually increasing.
[0025] (b) The influence of water flow state on circulating water Generally speaking, without considering other factors, the smaller the water flow velocity, the greater the tendency of scale formation.
[0026] (c) PH value is too high, which can make HCO3- unstable in water, and then convert to CO32-, thereby aggravating the scale formation phenomenon of circulating water.
[0027] (d) The effect of scale inhibitor and the use of scale inhibitor.
[0028] In order to achieve the purpose of water saving, it is found that in the process of water treatment, not only the scale inhibitor is added, but also the acid is added for composite treatment, so as to improve the concentration ratio of circulating water, and realize the effective scale inhibition effect.
[0029] (2) Under the premise that the temperature and flow rate meet the requirements, what kind of acid should be used to adjust the PH value:
[0030] Sulfuric acid: The purpose of adding sulfuric acid to circulating water is to neutralize the carbonate alkalinity in water. The reaction formula is as follows: Ca(HCO3)2+ H2SO4→ CaSO4+ 2CO2+ 2H2O
[0031] (a) The solubility product of calcium carbonate will increase after adding sulfuric acid;
[0032] Mg(HCO3)2+ H2SO4→ MgSO4+ 2CO2+ 2H2O
[0033] (b) Calcium carbonate will be converted into calcium sulfate, and the solubility product of calcium sulfate is about 3000 times that of calcium carbonate;
[0034] Hydrochloric acid: After adding hydrochloric acid, it is found that the concentration of chloride ions in water is increased, which will cause corrosion to the equipment; therefore, it cannot be added.
[0035] Nitric acid: Nitric acid has strong oxidizing property, which will also cause corrosion to the equipment, so it cannot be added.
[0036] The main purpose of adding acid to circulating cooling water system is to reduce the pH value and stabilize bicarbonate. Adding sulfuric acid can convert calcium carbonate in water into non-carbonate calcium hard with high solubility, so that the calcium carbonate in water can be reduced to below the critical limit of scale formation, thereby preventing the formation of calcium carbonate scale.
[0037] Secondly: acid treatment control index test, while controlling the concentration of circulating water, the content of organic phosphorus, also focus on the control of JD (alkalinity) of circulating water. Generally speaking, in the circulating water using acid treatment, JD is controlled between 3 to 5, and pH can be stabilized between 8.7 to 9.0.
[0038] Finally: the test of the adding way of acid, the sulfuric acid should be added in small amount and continuously. If the amount of acid is large, a formal acid adding system should be installed, including acid tank and acid metering pump. If the amount of acid is small or the formal system has not been built, a temporary method can be used, that is, to place a ton barrel above the pump pool and control the acid adding by valve and gravity.
[0039] (3) Add anaerobic modifier adding port and adding equipment to the inlet pipeline of anaerobic circulating pump, and add anaerobic modifier to the circulating pipeline at a concentration of 80 ppm of water flow. After three months of operation, it is found that the scaling of the anaerobic system is inhibited, but the effect is not obvious.
[0040] The adding amount of the modifier is increased to 100 ppm of the water inflow. After three months of operation, it is found that the scaling of the pipeline and equipment after the anaerobic modifier adding port can be effectively inhibited, but the pipeline before the anaerobic modifier adding port is still severely scaled.
[0041] The anaerobic modifier adding port is moved to the anaerobic circulating outlet valve, and the adding ratio is kept unchanged at 100 ppm of the water inflow. After three months of operation, it is found that the scaling of the pipeline and equipment of the anaerobic system is effectively inhibited, and the effect is obvious to meet the production requirements on site.
[0042] In the present application, the control valve 113 of the anaerobic system 1 is started, at this time the control valve 113 controls the flow rate and amount of the scale inhibitor in the storage tank 114, at this time the meter 116 detects the amount of the scale inhibitor, then stores the data and transmits it to the anaerobic system 1, after comparing the results of different doses and different types of scale inhibitors, the best scale inhibitor can be obtained, a group of stirrers 117 are installed in the connecting pipe 110, which also starts stirring while the equipment is running, so that the scale inhibitor and water are quickly and fully mixed together, thereby improving the cleaning efficiency, a plurality of micro-monitoring devices 118 are installed in the anaerobic circulating pipe, which can feed the scene in the anaerobic circulating pipe 111 to the anaerobic system 1, at this time the anaerobic system 1 controls the control valve 113 to open, so that the scale inhibitor enters the anaerobic circulating pipe and neutralizes with water, and finally cleans the dirt.
[0043] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application.
Claims
1. A scale inhibitor for a waste incineration power plant, characterized by: The anaerobic system (1) and the cooling system, the scale inhibitor for neutralization in the anaerobic system (1) includes PAM cation, reverse osmosis scale inhibitor, reducing agent, sodium hydroxide, oxidizing bactericide, industrial scale inhibitor, defoamer, non-oxidizing bactericide, stripping agent, trisodium phosphate, ammonia, STRO scale inhibitor, STRO acid, STRO alkaline cleaner, nanofiltration scale inhibitor, nanofiltration alkaline, nanofiltration acid cleaner, ultrafiltration alkaline, ultrafiltration acid cleaner, citric acid and sodium hypochlorite, the concentration of the scale inhibitor is 1%-10%, and the concentration of the scale inhibitor is adjusted according to the type and water quality hardness.
2. A waste incineration power plant scale inhibitor additive system, characterized in that: The adding system comprises a connecting pipe (110), one end of the connecting pipe (110) is fixedly connected to the outer wall of the anaerobic system (1); An anaerobic circulation pipe (111) is fixedly connected to the other end of the connecting pipe (110); A conveying pipe (112) is fixedly connected to the water outlet of a control valve (113); The control valve (113) is fixedly installed at the lower end of the storage tank (114), and is electrically connected to the anaerobic system (1); A liquid inlet (115) is fixedly installed at the upper end of the storage tank (114); A meter (116) is installed at the connection between the anaerobic system (1) and the connecting pipe (110); A stirrer (117) is installed behind the connection between the connecting pipe (110) and the anaerobic circulation pipe (111); A plurality of micro-monitors (118) are fixedly installed inside the anaerobic circulation pipe (111), and are connected to the anaerobic system (1) module.
3. The system for adding scale inhibitor according to claim 2, wherein: The water in the cooling system is added with scale inhibitors during treatment, and is also treated by adding acid, the purpose of adding sulfuric acid to the circulating water in the cooling system is to neutralize the carbonate alkalinity in the water, the reaction formula is as follows: Ca(HCO3)2+H2SO4→CaSO4+2CO2+2H2O, after adding sulfuric acid to the circulating water in the cooling system, the solubility product of calcium carbonate will increase, the formula is Mg(HCO3)2+H2SO4→MgSO4+2CO2+2H2O.
4. The system according to claim 3, wherein the system is characterized by: The JD in the circulating water treated by adding acid in the cooling system is controlled to be between 3 and 5, and the pH can be stabilized between 8.7 and 9.
0.
5. The system according to claim 2, wherein the system is characterized by: An anaerobic modifier adding port and adding equipment are added to the inlet pipeline of the anaerobic circulation pump, the anaerobic modifier is added to the circulating pipeline at a concentration of 80 ppm based on the water flow, the anaerobic modifier adding port is moved to the anaerobic circulation outlet valve, and the adding ratio continues to remain unchanged at 100 ppm based on the water flow.