Phosphorus-free low-sodium boiler water treatment agent

Abstract

The invention relates to the technical field of boiler water treatment. The phosphorus-free low-sodium boiler water treatment agent is prepared from the following raw materials in percentage by mass: 19 to 30 percent of pomegranate bark, 15 to 24 percent of bamboo shoots, 14 to 22 percent of green coffee beans, 3.4 to 5.7 percent of PAAS (Polyacrylamide), 2.8 to 4.6 percent of sodium molybdate, 1.9 to 3.3 percent of sodium sulfite and 1.5 percent of polydimethylsiloxane. The mass fraction of MIT is 1.2%, and the balance is pure water. The phosphorus-free and low-sodium boiler water treatment agent has the advantages of scale inhibition and environmental protection, no phosphate is used, and the influence on DO (dissolved oxygen) and BOD5 (biochemical oxygen demand) of a water body after discharge is reduced.

Description

Technical Field

[0001] This application relates to the technical field of boiler water treatment, and in particular to a phosphorus-free and low-sodium boiler water treatment agent. Background Art

[0002] The scale of steam boilers mainly comes from the medium inside the boilers. At present, the working medium inside boilers in our country is mostly industrial water that has not been softened, and metal ions are prone to scale formation, seriously affecting the thermal efficiency and production safety of boilers. Water treatment agents must be added to prevent scale formation. Traditional water treatment agents use a large amount of phosphates. However, when a large amount of phosphates are discharged, they will disrupt the ecological balance and cause the environment to lose its self-purification ability. After phosphates enter the water body, they promote the explosive proliferation of algae, resulting in a decrease in dissolved oxygen DO and an increase in biochemical oxygen demand BOD5 in the water body. Therefore, it is necessary to develop a phosphorus-free and low-sodium boiler water treatment agent that takes into account both scale inhibition and environmental protection. Summary of the Invention

[0003] In order to solve the above problems, the object of the present invention is to provide a phosphorus-free and low-sodium boiler water treatment agent, and the phosphorus-free and low-sodium boiler water treatment agent includes the following raw materials: Pomegranate peel with a mass fraction of 19% - 30%, bamboo shoots with a mass fraction of 15% - 24%, green coffee beans with a mass fraction of 14% - 22%, PAAS with a mass fraction of 3.4% - 5.7%, sodium molybdate with a mass fraction of 2.8% - 4.6%, sodium sulfite with a mass fraction of 1.9% - 3.3%, polydimethylsiloxane with a mass fraction of 1.5%, MIT with a mass fraction of 1.2%, and pure water to make up the balance; The preparation method of the phosphorus-free and low-sodium boiler water treatment agent is as follows: Crush the bamboo shoots to 50 mesh, then immerse them in a 0.7 mol / L hydrochloric acid solution with a mass 10 times that of the bamboo shoots, stir at 80°C for 50 min, filter out the solids with a 200-mesh sieve, and then evaporate and concentrate under reduced pressure at 78°C with a vacuum degree of 0.098 Mpa until the mass is 0.2 times that before evaporation to obtain a bamboo shoot extract; Crush the pomegranate peel and the green coffee beans to 100 mesh, then use 70% ethanol with a mass 8 times that of the pomegranate peel and the green coffee beans for reflux extraction at 60°C for 70 min, and evaporate and concentrate the obtained extract under reduced pressure at 73°C with a vacuum degree of 0.098 Mpa until the mass is 0.2 times that before evaporation to obtain a mixed extract; Mix the bamboo shoot extract, the mixed extract, the PAAS, the sodium molybdate, the sodium sulfite, the polydimethylsiloxane, the MIT, and the pure water evenly to obtain the phosphorus-free and low-sodium boiler water treatment agent.

[0004] Furthermore, the mass fraction of the pomegranate peel is 24%.

[0005] Furthermore, the mass fraction of the bamboo shoots is 19%.

[0006] Furthermore, the mass fraction of the green coffee beans is 18%.

[0007] Furthermore, the mass fraction of the PAAS is 4.5%.

[0008] Furthermore, the mass fraction of the sodium molybdate is 3.6%.

[0009] Furthermore, the mass fraction of the sodium sulfite is 2.5%.

[0010] The following beneficial effects may be brought by the present application: The phosphorus-free and low-sodium boiler water treatment agent of the present application takes into account both scale inhibition and environmental protection. Without using phosphates, it reduces the impact on DO and BOD5 in water after discharge. The phosphorus-free and low-sodium boiler water treatment agent of the present application acts in the boiler as an overall system. On the one hand, it combines metal ions through oxalic acid, tannins, chlorogenic acid, etc. obtained by extracting bamboo shoots, pomegranate peels and green coffee beans; on the other hand, it adds a polyacrylate PAAS dispersion system to prevent aggregation and deposition, adds sodium molybdate to amplify the antioxidant effect of plant polyphenols such as anthocyanins, adds sodium sulfite to reduce dissolved oxygen and reduce the oxidation of plant extracts, adds polydimethylsiloxane to reduce the foam in the system and ensure the steam quality, and adds methylisothiazolinone MIT to inhibit bacteria and prevent the system from deteriorating. Specific Embodiments

[0011] Here, in order to more clearly explain the overall concept of the present application, the overall solution of the present invention will be described in detail below by way of examples; 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 well-known technical features in the art are not described.

[0012] In the present application, the boiler has a use volume of 0.8 tons and a maximum pressure of 1.25 MPa. After one test, it is washed and then enters the next experiment; on average, the measured sampling shows that the tannin content in the pomegranate peel is 19.3%, the oxalic acid content in the bamboo shoots is 242 mg / 100 g, and the chlorogenic acid content in the green coffee beans is 7.1%.

[0013] Unless otherwise specified, each raw material component in the following examples can be obtained through commercial channels, the experimental instruments used are all conventional laboratory experimental instruments, and the performance testing methods are known testing methods in the art. The overall operating space environment is 25 °C and the air humidity is 30%.

[0014] The preferred embodiments are as follows: Example 1: The phosphorus-free and low-sodium boiler water treatment agent is prepared by the following method: Prepare pomegranate peel with a mass fraction of 24%, bamboo shoots with a mass fraction of 19%, green coffee beans with a mass fraction of 18%, PAAS with a mass fraction of 4.5%, sodium molybdate with a mass fraction of 3.6%, sodium sulfite with a mass fraction of 2.5%, polydimethylsiloxane with a mass fraction of 1.5%, MIT with a mass fraction of 1.2%, and make up the balance with pure water; Crush the bamboo shoots to 50 mesh, then immerse them in a 0.7 mol / L hydrochloric acid solution 10 times the mass of the bamboo shoots, stir at 80 °C for 50 min, filter out the solids with a 200-mesh sieve, and then evaporate and concentrate under reduced pressure at 78 °C with a vacuum degree of 0.098 Mpa to 0.2 times the mass before evaporation to obtain a bamboo shoot extract; Crush the pomegranate peel and the green coffee beans to 100 mesh, then reflux and extract with 70% ethanol 8 times the mass of the pomegranate peel and the green coffee beans at 60 °C for 70 min. The obtained extract is evaporated and concentrated under reduced pressure at 73 °C with a vacuum degree of 0.098 Mpa to 0.2 times the mass before evaporation to obtain a mixed extract; Mix the bamboo shoot extract, the mixed extract, the PAAS, the sodium molybdate, the sodium sulfite, the polydimethylsiloxane, the MIT, and the pure water evenly to obtain the phosphorus-free and low-sodium boiler water treatment agent.

[0015] Examples 2 to 13 The difference between Example 2 and Example 1 is only that the mass fraction of pomegranate peel is 19%; The difference between Example 3 and Example 1 is only that the mass fraction of pomegranate peel is 30%; The difference between Example 4 and Example 1 is only that the mass fraction of bamboo shoots is 15%; The difference between Example 5 and Example 1 is only that the mass fraction of bamboo shoots is 24%; The difference between Example 6 and Example 1 is only that the mass fraction of green coffee beans is 14%; The difference between Example 7 and Example 1 is only that the mass fraction of green coffee beans is 22%; The difference between Example 8 and Example 1 is only that the mass fraction of PAAS is 3.4%; The difference between Example 9 and Example 1 is only that the mass fraction of PAAS is 5.7%; The difference between Example 10 and Example 1 is only that the mass fraction of sodium molybdate is 2.8%; The difference between Example 11 and Example 1 is only that the mass fraction of sodium molybdate is 4.6%; The difference between Example 12 and Example 1 is only that the mass fraction of sodium sulfite is 1.9%; The difference between Example 13 and Example 1 is only that the mass fraction of sodium sulfite is 3.3%.

[0016] Comparative Examples 1 to 16 The difference between Comparative Example 1 and Example 1 is only that the mass fraction of pomegranate peel is 39%; The difference between Comparative Example 2 and Example 1 is only that the mass fraction of bamboo shoots is 31%; The difference between Comparative Example 3 and Example 1 is only that the mass fraction of green coffee beans is 30%; The difference between Comparative Example 4 and Example 1 is only that the mass fraction of PAAS is 10%; The difference between Comparative Example 5 and Example 1 is only that the mass fraction of sodium molybdate is 10%; The difference between Comparative Example 6 and Example 1 is only that the mass fraction of sodium sulfite is 8%; The difference between Comparative Example 7 and Example 1 is only that the mass fraction of polydimethylsiloxane is 5%; The difference between Comparative Example 8 and Example 1 is only that the mass fraction of MIT is 5%; The difference between Comparative Example 9 and Example 1 is only that the bamboo shoot extract is concentrated under reduced pressure at 90 °C; The difference between Comparative Example 10 and Example 1 is only that the mixed extract is refluxed at 80 °C; The difference between Comparative Example 11 and Example 1 is only that the pomegranate peel is replaced with tannin of equal mass and equal mass content and pure water to make up the mass; The difference between Comparative Example 12 and Example 1 is only that the bamboo shoots are replaced with oxalic acid of equal mass and equal mass content and pure water to make up the mass; The difference between Comparative Example 13 and Example 1 is only that the green coffee beans are replaced with chlorogenic acid of equal mass and equal mass content and pure water to make up the mass; The difference between Comparative Example 14 and Example 1 is only that the pomegranate peel, bamboo shoots and green coffee beans are replaced with pure water of equal mass; The difference between Comparative Example 15 and Example 1 is only that PAAS, sodium molybdate, sodium sulfite, polydimethylsiloxane and MIT are replaced with pure water of equal mass; The difference between Comparative Example 16 and Example 1 is only that the phosphorus-free and low-sodium boiler water treatment agent is replaced with sodium phosphate of equal mass; Blank group: The blank group does not put the phosphorus-free and low-sodium boiler water treatment agent and runs directly.

[0017] Prepare boiler batches with three times the number of samples, repeat each sample three times, and take the average of the results. The specific operation is as follows: Inject untreated softened water with a conductivity of 650 ± 10 μS / cm at 25°C at 0.9 times the water volume at the highest water level of the boiler, and add the phosphorus-free and low-sodium boiler water treatment agent at 0.1 times the mass of the injected water. After the steam condenses, it flows back into the boiler. After heating at 110°C for 20 hours, stop the furnace and intercept the scale through a 200-mesh stainless steel mesh to weigh the scale mass for the scale inhibition effect, and slowly drain the wastewater into an ecological pond with a BOD5 of 80 ± 5 mg / L and a DO of 5 ± 0.2 mg / L for the water volume. Detect the BOD5 and DO of the water at a depth of 10 cm at noon 12 days later, and calculate the increase in BOD5 and the decrease in DO as the environmental protection effect of avoiding water eutrophication. If it is less than 0.1, it is recorded as almost no change. After the BOD5 and DO of the ecological pond return to the initial values, conduct the next test. The units of the above scale mass, BOD5, and DO are g, mg / L, and mg / L respectively, and keep one decimal place. The test results are shown in Table 1. 3 For an ecological pond with a water volume having a BOD5 of 80 ± 5 mg / L and a DO of 5 ± 0.2 mg / L, detect the BOD5 and DO of the water at a depth of 10 cm at noon 12 days later, and calculate the increase in BOD5 and the decrease in DO as the environmental protection effect of avoiding water eutrophication. If it is less than 0.1, it is recorded as almost no change. After the BOD5 and DO of the ecological pond return to the initial values, conduct the next test. The units of the above scale mass, BOD5, and DO are g, mg / L, and mg / L respectively, and keep one decimal place. The test results are shown in Table 1.

[0018] Table 1: Test results of the scale inhibition effect and the effect of avoiding water eutrophication for each sample

[0019] From the data in Table 1, it can be seen that compared with other samples, the scale inhibition effect of the boiler in the solution of the embodiment of the present application, especially Embodiment 1 of the present application, is better, and the effect of avoiding water eutrophication is better; that is, the phosphorus-free and low-sodium boiler water treatment agent in the embodiment of the present application, especially Embodiment 1 of the present application, can take into account better scale inhibition effect and the effect of avoiding water eutrophication.

[0020] The above description is only for the embodiments of the present application and is not intended to limit the present application; for those skilled in the art, various changes and modifications can be made to the present application; any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A phosphorus-free and low-sodium boiler water treatment agent, characterized in that, The phosphorus-free and low-sodium boiler water treatment agent comprises the following raw materials: Pomegranate peel with a mass fraction of 19-30%, bamboo shoots with a mass fraction of 15-24%, green coffee beans with a mass fraction of 14-22%, PAAS with a mass fraction of 3.4-5.7%, sodium molybdate with a mass fraction of 2.8-4.6%, sodium sulfite with a mass fraction of 1.9-3.3%, polydimethylsiloxane with a mass fraction of 1.5%, MIT with a mass fraction of 1.2%, and pure water to make up the balance; The preparation method of the phosphorus-free and low-sodium boiler water treatment agent is as follows: Crush the bamboo shoots to 50 mesh, then immerse them in a 0.7 mol / L hydrochloric acid solution 10 times the mass of the bamboo shoots, stir at 80 °C for 50 min, filter out the solids with a 200-mesh sieve, and then concentrate by vacuum evaporation at 78 °C and a vacuum degree of 0.098 Mpa to 0.2 times the mass before evaporation to obtain a bamboo shoot extract; Crush the pomegranate peel and the green coffee beans to 100 mesh, then extract them with 70% ethanol 8 times the mass of the pomegranate peel and the green coffee beans by reflux at 60 °C for 70 min. The obtained extract is concentrated by vacuum evaporation at 73 °C and a vacuum degree of 0.098 Mpa to 0.2 times the mass before evaporation to obtain a mixed extract; Mix the bamboo shoot extract, the mixed extract, the PAAS, the sodium molybdate, the sodium sulfite, the polydimethylsiloxane, the MIT and the pure water evenly to obtain the phosphorus-free and low-sodium boiler water treatment agent.

2. The phosphorus-free and low-sodium boiler water treatment agent according to claim 1, wherein, The mass fraction of the pomegranate peel is 24%.

3. The phosphorus-free and low-sodium boiler water treatment agent according to claim 1, characterized in that, The mass fraction of the bamboo shoots is 19%.

4. The phosphorus-free and low-sodium boiler water treatment agent according to claim 1, wherein, The mass fraction of the green coffee beans is 18%.

5. The phosphorus-free and low-sodium boiler water treatment agent according to claim 1, characterized in that, The mass fraction of the PAAS is 4.5%.

6. The phosphorus-free and low-sodium boiler water treatment agent according to claim 1, wherein The mass fraction of the sodium molybdate is 3.6%.

7. The phosphorus-free and low-sodium boiler water treatment agent according to claim 1, characterized in that, The mass fraction of the sodium sulfite is 2.5%.

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