Deoxidant suitable for medium-high pressure boiler and preparation method of deoxidant

Abstract

The invention relates to the technical field of boiler water treatment, and particularly provides a deoxidant suitable for a middle-high pressure boiler and a preparation method of the deoxidant. The deoxidant suitable for the medium-high pressure boiler is prepared from the following raw materials in percentage by mass: 23 to 35 percent of roxburgh rose, 18 to 25 percent of spinach, 10 to 15 percent of leontopodium leontopodum, 4 to 8 percent of turmeric, 2 to 5 percent of purple perilla and the balance of pure water. According to the deoxidant suitable for the medium-high pressure boiler and the preparation method thereof, dissolved oxygen in water for the medium-high pressure boiler is removed on the premise that toxic or dangerous chemicals are not used, oxidation corrosion of the boiler is prevented, and meanwhile environment-friendly and green chemistry is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of boiler water treatment, and in particular to a deoxidizer suitable for medium and high pressure boilers and a preparation method thereof. Background Art

[0002] The use of boilers has increased with the rapid development of economic construction. As a special equipment, boilers are high-energy equipment that provides hot water, steam and other thermal energy. Therefore, the treatment of boiler water is very important. Among them, those above 1.9MPa are called medium- and high-pressure boilers, which are mainly used in medium- and large-scale thermal power plants or industrial and mining enterprises. They use treated soft water, have a low scaling rate, and the steam temperature can reach 500 degrees Celsius with a huge evaporation volume. At this time, dissolved oxygen in the water is the main factor of boiler oxidation corrosion, especially under high temperature and high pressure. Once there is too much dissolved oxygen in the water of medium- and high-pressure boilers, it will cause rapid oxidation corrosion with the boiler under high-temperature operation; therefore, controlling the dissolved oxygen content in water is a key measure to prevent boiler oxidation corrosion. The commonly used chemical deoxidizers such as acetone oxime and carbohydrazine are highly toxic and even dangerous, and do not meet the requirements of green chemistry. Large-particle deoxidizers such as reducing iron particles are easy to damage the boiler under the high temperature and high pressure environment of medium- and high-pressure boilers.

[0003] Therefore, it is necessary to develop a green and non-toxic deoxidizer suitable for medium and high pressure boilers and a preparation method thereof. Summary of the invention

[0004] In order to solve the above problems, the present invention aims to provide a deoxidizer suitable for medium and high pressure boilers and a preparation method thereof.

[0005] On the one hand, the present invention provides a method for preparing a deoxidizer suitable for medium and high pressure boilers, and the method for preparing a deoxidizer suitable for medium and high pressure boilers is as follows: Take 23-35% of roxburghii, 18-25% of spinach, 10-15% of edelweiss, 4-8% of turmeric, 2-5% of perilla and the balance of pure water; chop the above materials until they pass through a 50-mesh sieve and add them to a flash extractor, crush them at 12° C. and a speed of 3000 r / min for 150 seconds, and filter them with a 100-mesh filter to obtain a coarse filtration extract; add 95% ethanol with a mass that is 8 times the mass of the coarse filtration extract, mix and immerse at 15° C. for 12 hours, and then filter through 400 mesh to obtain an alcohol extraction extract; distill the alcohol extraction extract under reduced pressure at 71° C. and a vacuum degree of 800 mbar until no liquid flows out continuously, and collect the remaining liquid to obtain the deoxidizer suitable for medium and high pressure boilers.

[0006] Furthermore, the mass fraction of the roxburghii is 29%.

[0007] Furthermore, the mass fraction of the spinach is 21%.

[0008] Furthermore, the mass fraction of the edelweiss is 13%.

[0009] Furthermore, the mass fraction of the turmeric is 6%.

[0010] Furthermore, the mass fraction of the perilla is 3%.

[0011] On the other hand, the present invention provides a deoxidizer suitable for medium- and high-pressure boilers prepared by the above-mentioned method for preparing a deoxidizer suitable for medium- and high-pressure boilers.

[0012] The present invention can bring the following beneficial effects: The deoxidizer suitable for medium and high pressure boilers and the preparation method thereof of the present invention focus on removing dissolved oxygen in medium and high pressure boiler water without using toxic or hazardous chemicals, preventing boiler oxidation corrosion while achieving environmentally friendly green chemistry; its possible principles are as follows: Seabuckthorn is rich in vitamin C and citric acid, and spinach is rich in oxalic acid. Both have deoxygenation effects and are rich in lignin, which can promote the dispersion of the system and expand the scope of action; the flavonoids in leontopodium and perilla and curcumin in turmeric are reducing and also have deoxygenation effects; the volatile oils contained in leontopodium can help the system diffuse and improve the effect; the extracts of turmeric and perilla have antibacterial and preservation effects, which can improve the stability of the system and avoid premature deterioration of the system; in medium and high pressure boilers, as the temperature gradually rises, the above-mentioned components together achieve the effect of removing dissolved oxygen in the water of medium and high pressure boilers, and further gradually fail or degrade under the high temperature and high pressure of the medium and high pressure boilers, such as citric acid, vitamin C, oxalic acid, etc., reducing acid corrosion to the boiler and the impact of later emissions.

[0013] The above conditions are indispensable to each other. The parameters are obtained by chance in the present invention, and the effect of green deoxygenation is finally achieved. DETAILED DESCRIPTION

[0014] In order to more clearly explain the overall concept of the present invention, the overall scheme of the present invention is described in detail in the form of embodiments below; in the following description, a large number of specific details are given to provide a more thorough understanding of the present invention; however, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details; in other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0015] In the present invention, the flash extractor was purchased from Beijing Jinyang Wanda Technology Co., Ltd., model JHBE-100A; the vacuum distiller was purchased from Zhengzhou Yarong Instrument Co., Ltd., model RE-2000E; spinach was purchased from Jiangsu Cuigu Food Co., Ltd., and the water content was 7% after low-temperature drying; Rosa roxburghii, edelweiss, turmeric and perilla were purchased from Anhui Bowen Herbal Medicine Co., Ltd., with a water content of 5%; the boiler was purchased from Jiangsu Huayue Special Equipment Co., Ltd., model WDR3.0, with a maximum pressure of 2.5MPa, an output steam temperature of ≥184°C, and was cleaned after one test and entered the next test; the dissolved oxygen meter was purchased from Hangzhou Miko Sensing Technology Co., Ltd., model MIK-DC2000.

[0016] Unless otherwise specified, all raw material components in the following examples can be purchased from commercial sources, the experimental instruments used are conventional laboratory experimental instruments, and the performance test methods are known in the art. The overall operating space environment is 25°C and the air humidity is 30%.

[0017] The preferred implementation is as follows: Embodiment 1: The deoxidizer suitable for medium and high pressure boilers is prepared by the following method: Take 29% by weight of roxburghii, 21% by weight of spinach, 13% by weight of leontopodium alpinum, 6% by weight of turmeric, 3% by weight of perilla and the balance of pure water; chop the above materials until they pass through a 50-mesh sieve and add them to a flash extractor, crush them at 12° C. and a speed of 3000 r / min for 150 seconds, and filter them with a 100-mesh filter to obtain a coarse filtration extract; add 95% ethanol whose mass is 8 times that of the coarse filtration extract, mix and immerse at 15° C. for 12 hours, and then filter through 400 mesh to obtain an alcohol extraction extract; distill the alcohol extraction extract under reduced pressure at 71° C. and a vacuum degree of 800 mbar until no liquid flows out continuously, and collect the remaining liquid to obtain the deoxidizer suitable for medium and high pressure boilers.

[0018] Embodiment 2~11: The difference between Example 2 and Example 1 is that the mass fraction of Rosa roxburghii is 23%; The only difference between Example 3 and Example 1 is that the mass fraction of Rosa roxburghii is 35%; The only difference between Example 4 and Example 1 is that the mass fraction of spinach is 18%; The only difference between Example 5 and Example 1 is that the mass fraction of spinach is 25%; The only difference between Example 6 and Example 1 is that the mass fraction of edelweiss is 10%; The only difference between Example 7 and Example 1 is that the mass fraction of Leontopodium alpinum is 15%; The only difference between Example 8 and Example 1 is that the mass fraction of turmeric is 4%; The only difference between Example 9 and Example 1 is that the mass fraction of turmeric is 8%; The only difference between Example 10 and Example 1 is that the mass fraction of Perilla frutescens is 2%; The only difference between Example 11 and Example 1 is that the mass fraction of Perilla is 5%.

[0019] Comparative Examples 1 to 18: The difference between Comparative Example 1 and Example 1 is that the mass fraction of Rosa roxburghii is 11%; The difference between Comparative Example 2 and Example 1 is that the mass fraction of Rosa roxburghii is 46%; The difference between Comparative Example 3 and Example 1 is that the mass fraction of spinach is 9%; The only difference between Comparative Example 4 and Example 1 is that the mass fraction of spinach is 36%; The only difference between Comparative Example 5 and Example 1 is that the mass fraction of Leontopodium alpinum is 5%; The only difference between Comparative Example 6 and Example 1 is that the mass fraction of Edelweiss is 26%; The only difference between Comparative Example 7 and Example 1 is that the mass fraction of turmeric is 2%; The only difference between Comparative Example 8 and Example 1 is that the mass fraction of turmeric is 16%; The only difference between Comparative Example 9 and Example 1 is that the mass fraction of Perilla frutescens is 1%; The difference between Comparative Example 10 and Example 1 is that the mass fraction of Perilla is 10%; The only difference between Comparative Example 11 and Example 1 is that the temperature of the flash extractor crushing is 30°C; The difference between Comparative Example 12 and Example 1 is that the temperature of vacuum distillation is 90°C; The difference between Comparative Example 13 and Example 1 is that the roxburghii is replaced with spinach, edelweiss, turmeric and perilla of the same mass ratio as that of Example 1; The difference between Comparative Example 14 and Example 1 is that spinach is replaced with roxburghii, edelweiss, turmeric and perilla of the same mass ratio as that of Example 1; The difference between Comparative Example 15 and Example 1 is that the edelweiss is replaced with roxburghii, spinach, turmeric and perilla of the same mass ratio as that of Example 1; The difference between Comparative Example 16 and Example 1 is that turmeric is replaced by roxburghii, spinach, edelweiss and perilla of the same mass ratio as that of Example 1; The difference between Comparative Example 17 and Example 1 is that Perilla is replaced with Rosa roxburghii, spinach, Leontopodium alba and Turmeric in the same mass ratio as that in Example 1; The only difference between Comparative Example 18 and Example 1 is that the deoxidizer suitable for medium and high pressure boilers is replaced with pure water of equal quality; Blank group: The blank group was operated directly without adding deoxidizer suitable for medium and high pressure boilers.

[0020] A corresponding number of 16MnR type clean steel plates with a thickness of 0.5cm×25cm×10cm and a width of rust and scale are prepared. One of the above clean steel plates is suspended in the middle and lower part of the boiler of each example, and circulated for 10 days. The operation is specifically as follows: water is injected at a volume 0.7 times the highest water level of the boiler, the initial dissolved oxygen of the injected water is measured to be 4.2mg / L, and 0.3 times the mass of the injected water is added. The deoxidizer suitable for medium and high pressure boilers is added, and the operating pipeline is a 15m long output steam pipeline. The 2.0MPa output 184℃ hot steam is transferred to a small cooler for condensation and then returned to the boiler through a 15m long condensation reflux pipeline, only heat energy is output without consuming heat medium water.

[0021] After the operation is finished and cooled to room temperature, take out each steel plate, wash and dry it, weigh it and calculate the reduced mass of the steel plate as the anti-oxidation and acid corrosion effect, the unit is g, take 3 decimal places; after the dissolved oxygen meter is calibrated, immerse the electrode in the tested water sample at the boiler drain outlet to measure the dissolved oxygen, control the water flow rate to about 0.3m / s, the unit is mg / L, take 2 decimal places. The test results are shown in Table 1.

[0022] Table 1: Test results of deoxidation and anticorrosion effects of various examples

[0023] It can be seen from the data in Table 1 that, compared with other examples, the embodiments of the present invention, especially the solution of Embodiment 1 of the present invention, have less dissolved oxygen and less steel plate reduction; the embodiments of the present invention, especially the deoxidizer suitable for medium and high pressure boilers and the preparation method thereof of Embodiment 1 of the present invention, while reducing the use of toxic and hazardous chemical materials, have good deoxidation effect and good anti-corrosion effect, thereby realizing environmentally friendly green chemistry.

[0024] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for preparing a deoxidizer suitable for medium and high pressure boilers, characterized in that: The preparation method of the deoxidizer suitable for medium and high pressure boilers is as follows: Take 23-35% of roxburghii, 18-25% of spinach, 10-15% of edelweiss, 4-8% of turmeric, 2-5% of perilla and the balance of pure water; chop the above materials until they pass through a 50-mesh sieve and add them to a flash extractor, crush them at 12° C. and a speed of 3000 r / min for 150 seconds, and filter them with a 100-mesh filter to obtain a coarse filtration extract; add 95% ethanol with a mass that is 8 times the mass of the coarse filtration extract, mix and immerse at 15° C. for 12 hours, and then filter through 400 mesh to obtain an alcohol extraction extract; distill the alcohol extraction extract under reduced pressure at 71° C. and a vacuum degree of 800 mbar until no liquid flows out continuously, and collect the remaining liquid to obtain the deoxidizer suitable for medium and high pressure boilers.

2. The method for preparing a deoxidizer suitable for medium and high pressure boilers according to claim 1, characterized in that: The mass fraction of the roxburghii is 29%.

3. The method for preparing a deoxidizer suitable for medium and high pressure boilers according to claim 1, characterized in that: The mass fraction of the spinach is 21%.

4. The method for preparing a deoxidizer suitable for medium and high pressure boilers according to claim 1, characterized in that: The mass fraction of the edelweiss is 13%.

5. The method for preparing a deoxidizer suitable for medium and high pressure boilers according to claim 1, characterized in that: The mass fraction of the turmeric is 6%.

6. The method for preparing a deoxidizer suitable for medium and high pressure boilers according to claim 1, characterized in that: The mass fraction of the perilla is 3%.

7. A deoxidizer suitable for medium and high pressure boilers prepared by the method for preparing a deoxidizer suitable for medium and high pressure boilers as claimed in any one of claims 1 to 6.

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