An intelligent management system for boiler water based on organic stabilizer

Abstract

The invention discloses an intelligent management system for boiler water based on an organic stabilizer, comprising: an online detection end, which is used for collecting parameter information of pH value and conductivity in boiler water, and wirelessly transmitting the collected parameter information; an intelligent control system, which receives the collected parameter information through wireless transmission, uploads the collected parameter information as data, and performs intelligent control according to the collected parameter information; a dosing mechanism, which adds medicine to the boiler water according to the received control instructions; a cloud service platform, which is used for receiving, saving and uploading the uploaded parameter information, and sending cloud alarm information; the intelligent management system for boiler water based on the organic stabilizer adopts a phosphorus-free formula, which solves the problems of easy scaling and corrosion of the pipe wall, inability to inhibit scale such as iron and copper oxides, and achieves timely control, low dependence on operators, and refined and precise control effects.

Description

Technical Field

[0001] The invention relates to an intelligent boiler water management system based on an organic stabilizer. Background Art

[0002] At present, the domestic drum boiler water control usually adopts the phosphate treatment process. The specific process is to use a dosing pump to add the phosphate solution dissolved in the dosing tank to the drum boiler. Due to its low treatment cost, the phosphate treatment technology has been used for decades. According to the use experience, this treatment process has some technical performance limitations. For example, the tube wall is prone to scaling and corrosion, and it is impossible to inhibit scale such as iron and copper oxides; the boiler discharge rate is high, the heat energy loss is serious, and the comprehensive use cost is high; the boiler water and steam indicators fluctuate greatly and are difficult to control stably; the control delay is serious, and it is highly dependent on the technical level and sense of responsibility of the on-site operators. It is difficult to achieve refined and precise control, and the system indicators fluctuate greatly, which is not conducive to the long-term stable and safe operation of the boiler. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an intelligent boiler water management system based on an organic stabilizer that adopts a phosphorus-free formula to solve the problems of easy scaling and corrosion of the tube wall and the inability to inhibit scaling such as iron and copper oxides, while achieving timely control, low operator dependence, and refined and precise control effects.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] An intelligent management system for boiler water based on organic stabilizer, comprising:

[0006] The online detection terminal is used to collect parameter information of pH value and conductivity in boiler water and transmit the collected parameter information wirelessly;

[0007] The intelligent control system receives the collected parameter information through wireless transmission, uploads the collected parameter information as data, and performs intelligent control according to the collected parameter information;

[0008] The dosing mechanism adds chemicals to the boiler water according to the received control instructions;

[0009] The cloud service platform is used to receive and save uploaded parameter information and send cloud alarm information;

[0010] Remote control terminal, used to remotely monitor the operating status of the equipment, receive cloud alarm information and adjust equipment operating parameters;

[0011] The online detection end includes a PH online detector, an electrical conductivity online detector and a DTU remote transmission device. The PH online detector and the electrical conductivity online detector are both provided with more than one set and connected to the DTU remote transmission device. The DTU remote transmission device is used to wirelessly transmit the collected parameter information.

[0012] The intelligent control system includes a DTU remote transmission receiving device and a PLC controller, wherein the PLC controller is connected to the DTU remote transmission receiving device and receives parameter information sent by the DTU remote transmission sending device through the DTU remote transmission receiving device, and the PLC controller has a built-in PID operation unit and a quantitative fine-tuning unit;

[0013] The dosing mechanism includes a dosing pump, which is connected to a PLC controller and has its rotation speed determined by a PID operation unit and a quantitative fine-tuning unit. The supply end of the dosing pump is a phosphorus-free organic stabilizer, which includes two types, one of which is a high-pressure drum boiler organic stabilizer and the other is a low- and medium-pressure drum boiler organic stabilizer.

[0014] Preferably, the phosphorus-free organic stabilizer comprises the following raw materials in weight percentage: 0.5-8% aminopropyl cyclohexylamine, 1-8% isodecyloxypropylamine, 0.5-9% N-methyl-3-(methylamino)propionamide, 1-10% tetrasodium iminodisuccinate, 0.2-9% octadecylamine polyoxyethylene ether, and the balance is deionized water. The organic stabilizer is applied to high-pressure drum boilers.

[0015] Furthermore, the effective component content of the tetrasodium iminodisuccinate is 40%.

[0016] Furthermore, the average ethylene oxide number of the octadecylamine polyoxyethylene ether is 10-15.

[0017] Preferably, the phosphorus-free organic stabilizer comprises the following raw materials in weight percentage: 1-10% hexamethylenetetramine, 1-10% sodium metasilicate, 1-5% sodium molybdate dihydrate, 1-10% sodium bicarbonate, 1-5% polyethylene glycol, 1-6% dodecylamine polyoxyethylene ether, 1-10% methyldiethanolamine, and the balance is deionized water. The organic stabilizer is applied to low and medium pressure drum boilers.

[0018] Furthermore, the remote control terminal includes a remote PC terminal and a mobile phone APP client.

[0019] Furthermore, the PLC controller is provided with an Ethernet port and a 4G interface, and the data platform is wirelessly connected to the cloud service platform via the Ethernet port and the 4G interface.

[0020] At the online detection end, wireless transmission is adopted because it is inconvenient to construct cables at the equipment control site; the on-site collection table has display and setting functions, and has a communication interface for data transmission; high-precision imported electrodes are used to make the collected data stable and accurate, and the DTU adopts the latest LORA spread spectrum technology. It can stably transmit 1KM with a small amount of obstruction, and the transmission speed can reach 115.2Kbps, which meets the needs of online detection. Multiple detection ends can detect and transmit to the receiving end at the same time, and the receiving end processes the data and controls the corresponding equipment at the same time.

[0021] The data platform and the PLC controller preset the normal operation mode and the abnormal processing mode. The abnormal processing mode is set to a step-by-step multi-level warning and corresponding processing mode. The PLC controller intelligently controls the dosing process in real time according to the monitoring data received by the data platform. That is, when the online monitoring indicators are in the preset normal range, the PLC operates in the normal operation mode; when the online monitoring indicators are not in the preset normal range, the PLC automatically operates in the abnormal processing mode. The device automatically selects the corresponding processing mode according to the abnormal level, and makes an early warning prompt through the remote wireless function to remind the on-site operators to check whether there are any external abnormal changes in the boiler water quality system. At the same time, the operation of the system under this processing mode is monitored and controlled until the system indicators return to a reasonable range. The data platform can receive data from up to 255 detection terminals at the same time and accurately control the dosing pump of the corresponding detection terminal.

[0022] Principle description:

[0023] 1) It can form a continuous and dense protective film on the surface of the boiler body and the condensate return pipe, effectively preventing corrosion on the boiler surface; the boiler water stabilizer chelates a variety of scale-forming corrosive ions, and the multi-component synergistic effect prevents the formation of scale and silicon scale; through the strong binding of ion chelation and the change of the surface morphology of the boiler water, it inhibits the increase of foam or the co-evaporation of steam and water, and eliminates steam entrainment to purify the steam quality; the feed water stabilizer can adjust the pH value and dissolved oxygen of the feed water, without irritation to the environment and operators, and without any impact on human health;

[0024] 2) Environmentally friendly and phosphorus-free, it fundamentally eliminates the hidden phosphates, thereby eliminating the acid corrosion and alkali embrittlement corrosion caused by phosphates and reducing the problem of tube wall leakage; the agent can remove existing old scale during boiler operation and discharge it out of the boiler body through sewage discharge, thereby significantly improving the heat transfer efficiency of the boiler, saving fuel, and avoiding the phenomenon of tube bursting due to uneven heating of the furnace tubes.

[0025] 3) It is composed of a variety of organic ingredients. The agent itself will not increase the salt content and conductivity of the boiler water, but will reduce the salt content and conductivity of the boiler water to the minimum, achieve the maximum water purification, and allow the boiler to discharge at a minimum sewage rate of 0.2%. The scheduled discharge is extended from once per shift to once every 7-10 days; the continuous discharge is reduced from the original opening to the minimum opening, or directly closed, and only the valve leakage is used for discharge; it can usually save more than 80% of the sewage discharge, increase the concentration multiple, save a lot of heat energy, and significantly increase economic benefits.

[0026] Among them, aminopropyl cyclohexylamine and isodecyloxypropylamine are used as new neutralizers and adsorbents to neutralize acidic substances such as carbon dioxide, and can be adsorbed on the metal surface to form a protective film. Tetrasodium iminodisuccinate is a green, environmentally friendly, phosphorus-free chelating corrosion inhibitor that can chelate metal ions in water to prevent scaling and corrosion. N-methyl-3 (methylamino) propionamide, octadecylamine polyoxyethylene ether, etc. act as synergistic enhancers, solubility regulators, surface control agents, etc. Furthermore, N-methyl-3 (methylamino) propionamide, octadecylamine polyoxyethylene ether, etc. also act as film-forming aids or enhancers to synergistically play a role in corrosion protection.

[0027] Among them, hexamethylenetetramine is used as a corrosion inhibition component and an adsorption component to synergistically protect the water from corrosion. Sodium metasilicate and sodium molybdate dihydrate are used as phosphorus-free corrosion inhibitors to chelate and disperse the scaling and corrosion ions in the water, so that these ions remain in a microcrystalline state in the water and do not grow into larger scale bodies or corrosion products. Polyethylene glycol, dodecylamine polyoxyethylene ether, methyldiethanolamine, etc. are used as regulating components for the interface morphology of water to regulate the interface morphology of water and cooperate with other components to control water quality. At the same time, as adsorption surface components, they cooperate with other functional components to protect the surface of the metal matrix. Sodium bicarbonate and methyldiethanolamine, etc. are used as regulators and buffers, which have a relatively wide range of applications for water quality and chemicals.

[0028] The beneficial effects of the present invention are:

[0029] Compared with existing processes, the intelligent automatic dosing system greatly reduces the intensity and difficulty of on-site operations; it can provide more comprehensive corrosion protection for boilers, improve the quality of water and steam, and increase the safety factor of boilers; it plays a vital role in establishing an intelligent, automated, remote, and wireless monitoring and control system to enable boilers to achieve long-term, safe, efficient, and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the intelligent management system of boiler water based on organic stabilizer of the present invention;

[0031] Figure 2This is the principle block diagram of the simulated PID control system. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0033] Example 1

[0034] See also Figure 1 As shown, an intelligent management system for boiler water based on organic stabilizer includes an online detection terminal 1, a data platform 2 connected to the online detection terminal 1 by wireless transmission, a dosing pump 5 connected to the data platform 2, a cloud service platform 3 connected to the data platform 2, and a remote monitoring device 4 connected to the cloud service platform 3 by wireless transmission. The online detection terminal 1 includes a pH online detector and an electrical conductivity online detector, and a DTU remote transmission sending device connected to the pH online detector and the electrical conductivity online detector respectively. The data platform 2 includes a DTU remote transmission receiving device 21 for receiving data from the DTU remote transmission sending device, and a PLC controller 22 connected to the output end of the DTU remote transmission receiving device 21. The PLC controller 22 is connected to the dosing pump 5, and a PID operation module and a quantitative fine-tuning module are arranged in the PLC controller 22.

[0035] The online detection terminal 1 is provided with more than one, and each online detection terminal 1 corresponds to a PH online detector and an electrical conductivity online detector. The online detection terminals 1 are connected in parallel. The PLC controller 22 is provided with an Ethernet port and a 4G interface. The data platform 2 is wirelessly connected to the cloud service platform 3 via the Ethernet port and the 4G interface. The PLC controller 22 is connected to the dosing pump 5 via a PID operation module and a quantitative fine-tuning module. The remote monitoring device 4 includes a remote PC terminal and a mobile phone APP client.

[0036] The intelligent control system automatically adjusts the process parameters according to the indicators and stabilizes the boiler water indicators in the preset optimal range; the remote transmission system uploads the data and operating conditions to the cloud platform and the receiving end in real time, and remotely monitors and optimizes the system in real time so that the competent department can grasp the operating conditions of the boiler at any time. The intelligent automatic control mode overcomes the drawbacks of manual intermittent dosing and testing, and greatly reduces the intensity of manual operation and indicator fluctuations.

[0037] The Ethernet port and 4G interface on the PLC controller 22 can be uploaded to the cloud quickly and timely as long as a 4G traffic card is inserted or the Ethernet is connected. When a detection value threshold alarm occurs during the operation of the equipment, the alarm information will be pushed to the mobile phone APP or remote computer client so that parameters can be checked and adjusted in time.

[0038] The remote monitoring end can be a remote computer or a mobile phone APP. The remote computer and mobile phone APP have the same screen as the control end touch screen, and the operation is synchronized. The login is also simple and convenient. You can set the visitor's access time to better manage the equipment.

[0039] The pH value, conductivity and temperature data are received by the PLC controller 22 through the DTU remote receiving device 21. The PLC controller 22 performs PID operation + quantitative fine-tuning through the set parameters. The quantitative fine-tuning technology is to subdivide the ideal control range and the qualified control range to 2 decimal places. Then, the dosing pump 5 is frequency-controlled according to the real-time detected data. Simple quantitative fine-tuning cannot meet the ideal control and needs to be coordinated with PID operation. The output of the frequency conversion = PID operation value + quantitative fine-tuning value, which is the optimal speed of the dosing pump 1, which can ensure that the water quality always remains within the ideal control range.

[0040] The PLC controller 22 changes the dosage by adjusting the speed of the variable frequency dosing pump 5; the dosing pump 5 can perform two modes, continuous dosing and intermittent dosing, and both modes can perform PID calculation + quantitative fine-tuning to ensure the accuracy of dosing.

[0041] The principle of PID operation + quantitative fine-tuning is as follows:

[0042] In the analog control system, the most commonly used control law of the PLC controller 22 is PID control. The principle block diagram of the analog PID control system is as follows Figure 2 As shown in Figure 2, the system consists of an analog PID controller and a controlled object.

[0043] PID controller is a linear controller, which forms a control deviation based on the given value Yd(t) and the actual output value Y(t): err=Yd-Y.

[0044] The control law of PID is:

[0045]

[0046] Among them, Kp is the proportional coefficient; Ti is the integral time constant; T D is the differential time constant.

[0047] In simple terms, the functions of each correction link of the PID controller are as follows:

[0048] 1) Proportional link: Proportionally reflects the deviation signal error(t) of the control system. Once the deviation occurs, the controller immediately takes control action to reduce the deviation.

[0049] 2) Integral link: It is mainly used to eliminate static error and improve the system's error-free degree. The strength of the integral effect depends on the integral time constant Ti. The larger Ti is, the weaker the integral effect is, and vice versa.

[0050] 3) Differential link: reflects the changing trend (rate of change) of the deviation signal and can introduce an effective early correction signal into the system before the deviation signal becomes too large, thereby speeding up the system's action speed and reducing the adjustment time.

[0051] The above PID operation is encapsulated by PLC instructions. Customers only need to input the target value to complete the automatic control of PID. The PID parameters can be switched between automatic setting and manual parameter setting through buttons.

[0052] PID can basically meet the demand for control accuracy. In order to achieve better control accuracy, we have added a quantitative fine-tuning function on this basis, that is, PID operating value +- quantitative fine-tuning value = actual output adjustment, which adds subtle adjustments on the basis of PID.

[0053] Example 2

[0054] In an embodiment of the present invention, an organic stabilizer for high-pressure drum boiler water quality includes, by weight percentage, 4% aminopropylcyclohexylamine, 3% isodecyloxypropylamine, 5% N-methyl-3-(methylamino)propionamide, 6% tetrasodium iminodisuccinate, 5% octadecylamine polyoxyethylene ether, and the remainder is deionized water.

[0055] The effective component content of the tetrasodium iminodisuccinate is 40%, and the average number of ethylene oxides of the octadecylamine polyoxyethylene ether is 10-15.

[0056] A method for preparing an organic stabilizer for high-pressure drum boiler water quality comprises the following steps:

[0057] 1) Add 50% of the total amount of deionized water to the first reaction kettle, add 5% of N-methyl-3-(methylamino)propionamide and 6% of tetrasodium iminodisuccinate in sequence, maintain uniform stirring, keep the temperature at 25-40°C, until the solution is a transparent solution, and let it stand;

[0058] 2) Add 50% of the total amount of deionized water to the second reaction kettle, and add 4% of aminopropyl cyclohexylamine, 5% of octadecylamine polyoxyethylene ether and 3% of isodecyloxypropylamine in sequence until the solution becomes a transparent solution, and let it stand;

[0059] 3) Slowly and evenly add the solution prepared in reactor No. 1 to reactor No. 2, while keeping reactor No. 2 stirring at a constant speed until 30 minutes after the addition is completed. After standing for 0.5h to 1h, a uniform solution is obtained. After the relevant indicators are tested to be qualified, the finished product is packaged.

[0060] The organic stabilizer for high-pressure drum boiler water quality in Example 2 was applied to a 9.8Mpa high-pressure drum boiler in a thermal power plant, and the boiler water and steam indicators were significantly purified: for example, the average conductivity of the boiler water was reduced from 41.3uS / cm to 22.0uS / cm, and the average silica content of saturated steam was reduced from 15.5ug / L to 5.8ug / L; the boiler continuous discharge was reduced by 78%, and the fixed discharge was reduced by 82%.

[0061] Example 3

[0062] In an embodiment of the present invention, an organic stabilizer for high-pressure drum boiler water quality includes, by weight percentage, 5% aminopropylcyclohexylamine, 2% isodecyloxypropylamine, 6% N-methyl-3-(methylamino)propionamide, 4% tetrasodium iminodisuccinate, 6% octadecylamine polyoxyethylene ether, and the remainder is deionized water.

[0063] The effective component content of the tetrasodium iminodisuccinate is 40%, and the average number of ethylene oxides of the octadecylamine polyoxyethylene ether is 10-15.

[0064] A method for preparing an organic stabilizer for high-pressure drum boiler water quality comprises the following steps:

[0065] 1) Add 50% of the total amount of deionized water to the first reaction kettle, add 6% of N-methyl-3-(methylamino)propionamide and 4% of tetrasodium iminodisuccinate in sequence, maintain uniform stirring, keep the temperature at 25-40°C, until the solution is a transparent solution, and let it stand;

[0066] 2) Add 50% of the total amount of deionized water to the second reaction kettle, and add 5% of aminopropyl cyclohexylamine, 6% of octadecylamine polyoxyethylene ether and 2% of isodecyloxypropylamine in sequence until the solution becomes a transparent solution, and let it stand;

[0067] 3) Slowly and evenly add the solution prepared in reactor No. 1 to reactor No. 2, while keeping reactor No. 2 stirring at a constant speed until 30 minutes after the addition is completed. After standing for 0.5h to 1h, a uniform solution is obtained. After the relevant indicators are tested to be qualified, the finished product is packaged.

[0068] The organic stabilizer for high-pressure drum boiler water quality in Example 3 was applied to a 10.2Mpa high-pressure drum boiler in a petrochemical plant, and the boiler water and steam indicators were significantly purified: for example, the average conductivity of the boiler water was reduced from 46.2uS / cm to 24.1uS / cm, and the average silica content of saturated steam was reduced from 12.2ug / L to 4.4ug / L; the boiler continuous discharge was reduced by 75%, and the fixed discharge was reduced by 84%.

[0069] Example 4

[0070] In an embodiment of the present invention, an organic stabilizer for high-pressure drum boiler water quality includes, by weight percentage, 7% aminopropylcyclohexylamine, 6% isodecyloxypropylamine, 3% N-methyl-3-(methylamino)propionamide, 3% tetrasodium iminodisuccinate, 4% octadecylamine polyoxyethylene ether, and the remainder is deionized water.

[0071] The effective component content of the tetrasodium iminodisuccinate is 40%, and the average number of ethylene oxides of the octadecylamine polyoxyethylene ether is 10-15.

[0072] A method for preparing an organic stabilizer for high-pressure drum boiler water quality comprises the following steps:

[0073] 1) Add 50% of the total amount of deionized water to the first reaction kettle, add 3% of N-methyl-3-(methylamino)propionamide and 3% of tetrasodium iminodisuccinate in sequence, maintain uniform stirring, keep the temperature at 25-40°C, until the solution is a transparent solution, and let it stand;

[0074] 2) Add 50% of the total amount of deionized water to the second reaction kettle, and add 7% of aminopropyl cyclohexylamine, 4% of octadecylamine polyoxyethylene ether and 6% of isodecyloxypropylamine in sequence until the solution becomes a transparent solution, and let it stand;

[0075] 3) Slowly and evenly add the solution prepared in reactor No. 1 to reactor No. 2, while keeping reactor No. 2 stirring at a constant speed until 30 minutes after the addition is completed. After standing for 0.5h to 1h, a uniform solution is obtained. After the relevant indicators are tested to be qualified, the finished product is packaged.

[0076] The organic stabilizer for high-pressure drum boiler water quality of Example 4 was applied to a 9.3Mpa high-pressure drum boiler in a coal chemical plant, and the boiler water and steam indicators were significantly purified: for example, the average conductivity of the boiler water was reduced from 44.3.3uS / cm to 21.2uS / cm, and the average silica content of saturated steam was reduced from 11.1ug / L to 3.2ug / L; the boiler continuous discharge was reduced by 76%, and the fixed discharge was reduced by 80%.

[0077] Example 5

[0078] An organic stabilizer for low-medium pressure drum boiler water quality comprises the following components in percentage by weight: 2% hexamethylenetetramine, 2% sodium metasilicate, 2% sodium molybdate dihydrate, 5% sodium bicarbonate, 2% polyethylene glycol, 3% dodecylamine polyoxyethylene ether, 5% methyldiethanolamine, and the balance is deionized water.

[0079] A method for preparing an organic stabilizer for low-medium pressure drum boiler water quality comprises the following steps:

[0080] 1) Add 60% of deionized water to the No. 1 reactor, and add 2% of hexamethylenetetramine, 2% of sodium metasilicate, 2% of sodium molybdate dihydrate, and 5% of sodium bicarbonate in sequence, maintain uniform stirring, keep the temperature at 25-40°C, until the solution is a transparent solution, and let it stand;

[0081] 2) Add 40% of deionized water to the No. 2 reactor, and add 2% of polyethylene glycol, 3% of dodecylamine polyoxyethylene ether, and 5% of methyldiethanolamine in sequence until the solution becomes a transparent solution, and let it stand;

[0082] 3) Slowly and evenly add the solution prepared in reactor No. 1 to reactor No. 2, while keeping reactor No. 2 stirring at a constant speed until 30 minutes after the addition is completed. After standing for 30 minutes, a uniform solution is obtained. After the relevant indicators are tested to be qualified, the finished product is packaged.

[0083] Example 6

[0084] An organic stabilizer for low-medium pressure drum boiler water quality comprises the following components in percentage by weight: 5% hexamethylenetetramine, 1% sodium metasilicate, 4% sodium molybdate dihydrate, 2% sodium bicarbonate, 4% polyethylene glycol, 1% dodecylamine polyoxyethylene ether, 2% methyldiethanolamine, and the balance is deionized water.

[0085] A method for preparing an organic stabilizer for low-medium pressure drum boiler water quality comprises the following steps:

[0086] 1) Add 80% of the total amount of deionized water to the first reaction kettle, and then add 5% of hexamethylenetetramine, 1% of sodium metasilicate, 4% of sodium molybdate dihydrate, and 2% of sodium bicarbonate in sequence, maintain uniform stirring, keep the temperature at 25-40°C, until the solution is a transparent solution, and let it stand;

[0087] 2) Add 20% of the total amount of deionized water to the second reaction kettle, and add 4% of polyethylene glycol, 1% of dodecylamine polyoxyethylene ether, and 2% of methyldiethanolamine in sequence until the solution becomes a transparent solution, and let it stand;

[0088] 3) Slowly and evenly add the solution prepared in reactor No. 1 to reactor No. 2, while keeping reactor No. 2 stirring at a constant speed until 30 minutes after the addition is completed. After standing for 60 minutes, a uniform solution is obtained. After the relevant indicators are tested to be qualified, the finished product is packaged.

[0089] Example 7

[0090] An organic stabilizer for low-medium pressure drum boiler water quality comprises the following components in percentage by weight: 3% hexamethylenetetramine, 6% sodium metasilicate, 4% sodium molybdate dihydrate, 6% sodium bicarbonate, 5% polyethylene glycol, 5% dodecylamine polyoxyethylene ether, 4% methyldiethanolamine, and the balance is deionized water.

[0091] A method for preparing an organic stabilizer for low-medium pressure drum boiler water quality comprises the following steps:

[0092] 1) Add 70% of deionized water to the No. 1 reactor, and add 3% hexamethylenetetramine, 6% sodium metasilicate, 4% sodium molybdate dihydrate, and 6% sodium bicarbonate in sequence, maintain uniform stirring, keep the temperature at 25-40°C, until the solution is a transparent solution, and let it stand;

[0093] 2) Add 30% of the total amount of deionized water to the second reaction kettle, and add 5% of polyethylene glycol, 5% of dodecylamine polyoxyethylene ether, and 4% of methyldiethanolamine in sequence until the solution becomes a transparent solution, and let it stand;

[0094] 3) Slowly and evenly add the solution prepared in reactor No. 1 to reactor No. 2, while keeping reactor No. 2 stirring at a constant speed until 30 minutes after the addition is completed. After standing for 45 minutes, a uniform solution is obtained. After the relevant indicators are tested to be qualified, the finished product is packaged.

[0095] Experimental Example 1

[0096] For high-pressure drum boilers, the organic stabilizer in the above Examples 2-4 is used, and combined with the intelligent boiler water management system, the indicators in the boiler furnace are recorded, and the results are shown in Tables 1-4 below.

[0097] Table 1 Conductivity of boiler water

[0098]

[0099] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0100] It can be seen from Table 1 that before the intelligent management system of boiler water was adopted in the high-pressure drum boiler, the conductivity of boiler water was high and the fluctuation range was large, which was not conducive to the control of boiler water quality; after using the organic stabilizer for high-pressure drum boiler water quality, the conductivity of boiler water was significantly reduced and basically stabilized in the range of 18-24uS / cm.

[0101] Table 2 PH of boiler water

[0102]

[0103] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0104] It can be seen from Table 2 that before the intelligent management system of boiler water was adopted in the high-pressure drum boiler, the pH value of the boiler water fluctuated greatly, which increased the difficulty of workers in controlling the indicators of dosing, and was not conducive to the stability of the boiler water quality and steam quality; after using the organic stabilizer for high-pressure drum boiler water quality, the pH value of the boiler water gradually stabilized in a narrow numerical range and was within the optimal control range, indicating that after adding the organic stabilizer for high-pressure drum boiler water quality, the boiler water quality was better controlled and maintained.

[0105] Table 3 Silicon dioxide content of saturated steam

[0106]

[0107]

[0108] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0109] From Table 3, it can be seen that before the intelligent management system for boiler water was used in the high-pressure drum boiler, the silica content in the saturated steam was in the range of 6 to 13 ug / l. As time goes by, it is easy to deposit and enrich in the pipeline and steam system. After the intelligent management system was used, the silica content in the saturated steam was reduced to 4 to 6 ug / l, and the carrying amount was greatly reduced, indicating that after the intelligent management system was used stably, the steam quality was greatly purified.

[0110] Table 4 Sewage flow

[0111]

[0112]

[0113] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0114] It can be seen from Table 4 that before the intelligent management system of boiler water was adopted in the high-pressure drum boiler, the continuous discharge opening was large, the scheduled discharge was at least once per shift, the boiler discharge volume was always 6-7t / h, and a large amount of high-temperature water and steam resources were wasted; after the use of organic stabilizer for high-pressure drum boiler water quality, the continuous discharge opening was reduced to the minimum opening, the scheduled discharge was reduced to once every 7-9 days, and the discharge volume dropped to 2-3t / h, saving a large amount of water and steam resources. About 100 tons of sewage can be saved every day. The cost of high-temperature sewage discharge is calculated at 80 yuan / ton, which can save about 2.4 million yuan per year, and the economic benefit value-added is very significant.

[0115] Table 5 Parameter range of low pressure to ultra-high pressure boilers

[0116]

[0117]

[0118] This experimental example is mainly aimed at high-pressure boilers, that is, drum boilers with a pressure range of P ≥ 5.4Mpa.

[0119] Experimental Example 2

[0120] For low and medium pressure drum boilers, the organic stabilizer in the above Examples 5-7 is used, and combined with the intelligent boiler water management system, the indicators in the boiler furnace are recorded, and the results are shown in the following Tables 6-9.

[0121] Table 6 Conductivity of boiler water

[0122]

[0123] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0124] It can be seen from Table 6 that before the intelligent management system of boiler water was adopted in low and medium pressure drum boilers, the conductivity of boiler water was relatively high and had a large fluctuation range, which was not conducive to the control of boiler water quality; after using organic stabilizers for low and medium pressure drum boiler water quality, the conductivity of boiler water was significantly reduced and basically stabilized in the range of 30-50uS / cm.

[0125] Table 7 PH of boiler water

[0126]

[0127] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0128] It can be seen from Table 7 that before the intelligent management system of boiler water was adopted in low and medium pressure drum boilers, the pH value of boiler water fluctuated greatly, which increased the difficulty of workers in controlling the indicators of dosing, and was not conducive to the stability of boiler water quality and steam quality; after using organic stabilizers for low and medium pressure drum boiler water quality, the pH value of boiler water gradually stabilized in a narrow numerical range and was within the optimal control range, indicating that after adding organic stabilizers for low and medium pressure drum boiler water quality, the boiler water quality was better controlled and maintained.

[0129] Table 8 Silicon dioxide content of saturated steam

[0130]

[0131]

[0132] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0133] From Table 8, it can be seen that before the intelligent management system for boiler water was used in low- and medium-pressure drum boilers, the silica content in saturated steam was in the range of 16 to 30 ug / l. As time goes by, it is easy to deposit and enrich in pipelines and steam systems. After using the intelligent management system, the silica content in saturated steam was reduced to 5 to 9 ug / l, and the carrying amount was greatly reduced, indicating that after the intelligent management system was used stably, the steam quality was greatly purified.

[0134] Table 9 Sewage flow

[0135]

[0136]

[0137] Note: The data in the table are the average values ​​of samples obtained in a certain proportion every month.

[0138] It can be seen from Table 9 that before the intelligent management system of boiler water was adopted in low and medium pressure drum boilers, the continuous discharge opening was large, the scheduled discharge was at least once per shift, the boiler sewage discharge volume was always 6-10t / h, and a large amount of high-temperature water and steam resources were wasted; after using the organic stabilizer for low and medium pressure drum boiler water quality, the continuous discharge opening was reduced to the minimum opening, the scheduled discharge was reduced to once every 7-9 days, and the sewage discharge volume dropped to 2-3t / h, saving a large amount of water and steam resources. About 70-130 tons of sewage can be saved every day. The cost of high-temperature sewage discharge is calculated at 85 yuan / ton, which can save about 1 million to 2 million yuan per year, and the economic benefit value-added is very significant.

[0139] Table 10 Parameter range of low pressure to ultra-high pressure boilers

[0140]

[0141]

[0142] This experimental example is mainly aimed at low and medium pressure boilers, that is, drum boilers with a pressure range of P < 5.3Mpa.

[0143] The beneficial effects of the present invention are:

[0144] Compared with existing processes, the intelligent automatic dosing system greatly reduces the intensity and difficulty of on-site operations; it can provide more comprehensive corrosion protection for boilers, improve the quality of water and steam, and increase the safety factor of boilers; it plays a vital role in establishing an intelligent, automated, remote, and wireless monitoring and control system to enable boilers to achieve long-term, safe, efficient, and stable operation.

[0145] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. An intelligent boiler water management system based on organic stabilizer, characterized in that: Included are: The online detection terminal is used to collect parameter information of pH value and conductivity in boiler water and transmit the collected parameter information wirelessly; The intelligent control system receives the collected parameter information through wireless transmission, uploads the collected parameter information as data, and performs intelligent control according to the collected parameter information; The dosing mechanism adds chemicals to the boiler water according to the received control instructions; The cloud service platform is used to receive and save uploaded parameter information and send cloud alarm information; Remote control terminal, used to remotely monitor the operating status of the equipment, receive cloud alarm information and adjust equipment operating parameters; The online detection end includes a pH online detector, an electrical conductivity online detector and a DTU remote transmission device. The pH online detector and the electrical conductivity online detector are both provided with one or more sets and connected to the DTU remote transmission device. The DTU remote transmission device is used to wirelessly transmit the collected parameter information. The intelligent control system includes a DTU remote transmission receiving device and a PLC controller, wherein the PLC controller is connected to the DTU remote transmission receiving device and receives parameter information sent by the DTU remote transmission sending device through the DTU remote transmission receiving device, and the PLC controller has a built-in PID operation unit and a quantitative fine-tuning unit; The dosing mechanism includes a dosing pump, which is connected to a PLC controller and has a rotation speed determined by a PID operation unit and a quantitative fine-tuning unit, and a phosphorus-free organic stabilizer is supplied to the dosing pump; The phosphorus-free organic stabilizer comprises the following raw materials in weight percentage: 0.5-8% aminopropyl cyclohexylamine, 1-8% isodecyloxypropylamine, 0.5-9% N-methyl-3-(methylamino)propionamide, 1-10% tetrasodium iminodisuccinate, 0.2-9% octadecylamine polyoxyethylene ether, and the balance is deionized water; Or the phosphorus-free organic stabilizer comprises the following raw materials in weight percentage: 1-10% hexamethylenetetramine, 1-10% sodium metasilicate, 1-5% sodium molybdate dihydrate, 1-10% sodium bicarbonate, 1-5% polyethylene glycol, 1-6% dodecylamine polyoxyethylene ether, 1-10% methyldiethanolamine, and the balance is deionized water.

2. The intelligent boiler water management system based on organic stabilizer according to claim 1, characterized in that: The effective component content of the tetrasodium iminodisuccinate is 40%.

3. The intelligent boiler water management system based on organic stabilizer according to claim 1, characterized in that: The average ethylene oxide number of the octadecylamine polyoxyethylene ether is 10-15.

4. An intelligent boiler water management system based on organic stabilizer according to any one of claims 1 to 3, characterized in that: The remote control terminal includes a remote PC terminal and a mobile phone APP client.

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