A coal-saving catalyst for thermal power plants and its preparation method

Abstract

This invention relates to the C10L9 / 10 field of IPC classification, and particularly to a coal-saving catalyst for thermal power plants and its preparation method. The coal-saving catalyst, by mass percentage, comprises the following raw materials: 5-20% gluconate, 10-20% diol, 5-13% citrate, 3-10% oxygen-containing free radical organic matter, 1-3% molasses, 0.1-1% dispersant, and deionized water to make up the balance. The coal-saving catalyst prepared in this application has excellent effects in promoting coal combustion, reducing burnout, improving combustion efficiency, and reducing pollutant emissions. It also effectively enhances the mutual wetting effect of the coal system and strengthens the penetration of the coal-saving catalyst within the coal system. It is suitable for promotion in the thermal power field and has broad development prospects.

Description

Technical Field

[0001] This invention relates to the field of C10L9 / 10 in the IPC classification, and more particularly to a coal-saving catalyst for thermal power plants and its preparation method. Background Technology

[0002] Energy is one of the most pressing survival issues facing countries around the world today. In recent years, coal prices have risen too rapidly, leading to a sharp increase in raw material costs for many thermal power plants. How to further reduce production costs while ensuring the achievement of production targets, thereby achieving energy conservation and efficiency, is a problem faced by many thermal power plants.

[0003] With rising coal prices, many thermal power plants opt for the cheapest, lowest-quality coal for power generation. Often, these coals cannot effectively prevent coking during combustion, resulting in large amounts of char deposits that adhere to the furnace walls. This buildup gradually thickens, reducing the calorific value of the coal and necessitating shutdowns for char removal. This is a major hidden danger and problem in coal-fired power generation. Furthermore, ordinary coal-saving agents lack the ability to remove char and prevent its formation. While power plants may save coal, coal charring remains a significant factor affecting thermal power generation.

[0004] The existing technology (CN201510333618.4) provides a high-efficiency coal-saving agent, whose main raw materials include combustion improvers, desulfurizers, oxidants and catalysts, and claims that the final coal-saving agent has excellent coal combustion efficiency improvement effect and good nitrogen oxide and sulfur oxide reduction effect. However, its effect is still relatively simple. For example, it cannot effectively improve the wetting effect between coal and the removal of coke scale.

[0005] Therefore, in order to solve the above problems, this application provides a coal-saving catalyst for thermal power plants, and further provides a method for its preparation. Summary of the Invention

[0006] To address the aforementioned problems, the first aspect of this invention provides a coal-saving catalyst for thermal power plants, comprising the following components by mass percentage: 5-20% gluconate, 10-20% diol, 5-13% citrate, 3-10% oxygen-containing free radical organic matter, 1-3% molasses, 0.1-1% dispersant, and the remainder being deionized water.

[0007] As a preferred embodiment, the gluconate is at least one of sodium gluconate, calcium gluconate, potassium gluconate, and ferrous gluconate.

[0008] As a preferred embodiment, the gluconate is sodium gluconate.

[0009] As a preferred embodiment, the diol is at least one selected from ethylene glycol, propylene glycol, butanediol, and pentanediol.

[0010] As a preferred option, the diol is ethylene glycol.

[0011] As a preferred embodiment, the citrate is at least one of ferric citrate, copper citrate, sodium citrate, calcium citrate, and aluminum citrate.

[0012] As a preferred option, the citrate is ferric citrate.

[0013] As a preferred embodiment, the oxygen-containing free radical organic compound is methyl tert-butyl ether, dimethyl carbonate, and... At least one of them, where n=1 or 2.

[0014] As a preferred embodiment, the oxygen-containing free radical organic compound is , where n=1.

[0015] As a preferred embodiment, the dispersant is polyethylene glycol monostearate and / or 18-crown ether-6.

[0016] As a preferred embodiment, the mass ratio of the gluconate to the diol is 9~14:13~16.

[0017] As a preferred embodiment, the mass ratio of the gluconate to the diol is 12:14.

[0018] As a preferred embodiment, the mass ratio of the citrate to the oxygen-containing free radical organic compound is 7~11:5~8.

[0019] As a more preferred embodiment, the mass ratio of the citrate to the oxygen-containing free radical organic compound is 10:7.

[0020] In this application, by employing a specific compound of citrate and oxygen-containing free radical organic matter, the combustion efficiency of coal is significantly improved, pollutant emissions are reduced, and the formation and removal of coke deposits are further reduced. The applicant believes that the oxygen-containing free radical organic matter used in this application can release oxygen-containing free radicals during normal low-temperature processes. These groups can combine with volatile components in coal, reducing the activation energy of the reaction. Furthermore, when citrate is added simultaneously, and the mass ratio of the two is 7-11:5-8, as combustion progresses, the large-molecule carbon chain organic matter in the coal becomes increasingly difficult to burn. The transition metal complex, ferric citrate, acts as a catalyst for catalytic cracking, rapidly causing the large-molecule carbon chains to crack, producing a large amount of low-molecular-weight or small-molecular-weight hydrocarbons equivalent to the volatile matter in the coal. These hydrocarbons, in conjunction with the oxygen-containing free radical organic matter, release oxygen-containing free radical groups, which can greatly reduce the formation of coke deposits.

[0021] As a preferred embodiment, the dispersant is polyethylene glycol monostearate and 18-crown ether-6 in a mass ratio of 1:1.

[0022] The second aspect of the present invention provides a method for preparing the above-mentioned coal-saving catalyst for thermal power plants, the steps of which include the following steps: (1) according to the formula ratio, first dissolve gluconate, citrate, oxygen-containing free radical organic matter, and dispersant in water at 55~75℃, stir and dissolve, and then cool; (2) then add the formula ratio of diol and molasses and stir to mix evenly to obtain the catalyst.

[0023] Beneficial effects:

[0024] 1. The coal-saving catalyst for thermal power plants provided in this application can effectively reduce the combustion temperature of coal, accelerate the complete combustion rate of coal, and reduce the burnout time. With the acceleration of the combustion rate and the advancement of the time, more efficient heat can be released in a short time, thereby greatly improving the utilization efficiency of coal in the entire thermal power generation process and reducing raw material and maintenance costs.

[0025] 2. The coal-saving catalyst for thermal power plants provided in this application greatly improves the combustion efficiency of coal and reduces pollutant emissions by using a specific compound of citrate and oxygen-containing free radical organic matter. It can also further reduce the formation and remove coke scale. In particular, when the mass ratio of citrate to oxygen-containing free radical organic matter is 7~11:5~8, its final effect can be greatly improved.

[0026] 3. The coal-saving catalyst for thermal power plants provided in this application adopts specific dispersant components, especially when polyethylene glycol monostearate and 18-crown ether-6 are used as dispersants in a mass ratio of 1:1. The two can effectively synergistically promote the mutual wetting between the components and carry out the infiltration catalysis of the coal system, eliminate static electricity, ensure the independence and dispersion effect of coal fine particles, and make the whole process have a larger combustion surface area. Detailed Implementation

[0027] Example 1

[0028] Example 1 provides a coal-saving catalyst for thermal power plants, wherein the raw materials, by mass percentage, include the following components: sodium gluconate 9%, ethylene glycol 13%, ferric citrate 7%, oxygen-containing free radical organic matter 5%, molasses 1%, dispersant 0.3%, and deionized water to make up the balance.

[0029] Among them, oxygen-containing free radical organic compounds are , where n=1.

[0030] The dispersant is polyethylene glycol monostearate and 18-crown ether-6 in a mass ratio of 1:1.

[0031] In this embodiment, polyethylene glycol monostearic acid ester n=6 was purchased from Hubei Shineng Chemical Technology Co., Ltd.

[0032] The second aspect of this embodiment provides a method for preparing the above-mentioned coal-saving catalyst, the steps of which include the following steps: (1) According to the formula ratio, sodium gluconate, ferric citrate, oxygen-containing free radical organic matter, and dispersant are first dissolved in water at 65°C and stirred until dissolved and then cooled; (2) Then, ethylene glycol and molasses in the formula ratio are added and stirred until evenly mixed to obtain the catalyst.

[0033] Example 2

[0034] The specific implementation method of this embodiment is the same as that of Embodiment 1, except that: sodium gluconate 14%, ethylene glycol 16%, ferric citrate 11%, oxygen-containing free radical organic matter 6%, molasses 3%, dispersant 0.7%, and deionized water to make up the balance.

[0035] Example 3

[0036] The specific implementation method of this embodiment is the same as that of Embodiment 1, except that: sodium gluconate 12%, ethylene glycol 14%, ferric citrate 10%, oxygen-containing free radical organic matter 7%, molasses 2%, dispersant 0.5%, and deionized water to make up the balance.

[0037] Example 4

[0038] The specific implementation method of this embodiment is the same as that of embodiment 1, except that: sodium gluconate 11%, ethylene glycol 15%, ferric citrate 11%, oxygen-containing free radical organic matter 8%, molasses 1%, dispersant 0.6%, and deionized water to make up the balance.

[0039] Comparative Example 1

[0040] The specific implementation method of this comparative example is the same as that of Example 3, except that the dispersant used is 18-crown ether-6 alone.

[0041] Comparative Example 2

[0042] The specific implementation method of this comparative example is the same as that of Example 3, except that the content of oxygen-containing free radical organic matter is 2%.

[0043] Performance Evaluation

[0044] An online coal-saving agent experiment was conducted at the power plant. During the production process, the coal-saving agent was stably added through a metering pump. A blank period experiment was conducted before the addition of the coal-saving agent, and the experimental period was conducted after the addition of the coal-saving agent. The data from the two periods were compared to obtain the product values.

[0045] The amount of coal-saving agent added was 0.5 wt% of the total coal consumption. The change in coal consumption per unit of power generation during the experimental period was calculated, and the change in the frequency of coke deposits was recorded. A negative change in coal consumption per unit of power generation indicates a decrease in coal consumption, and vice versa; the change in the frequency of coke deposits is calculated similarly.

[0046] Table 1

[0047]

[0048] As can be seen from Examples 1-2, Comparative Examples 1-3 and Table 1, the coal-saving catalyst for thermal power plants and its preparation method provided by the present invention have good effects in promoting coal combustion, reducing burnout, improving combustion efficiency, and reducing pollutant emissions. Furthermore, it effectively enhances the mutual wetting effect of the coal system and enhances the penetration effect of the coal-saving catalyst in the coal system. It is suitable for promotion in the field of thermal power and has broad development prospects.

Claims

1. A coal-saving catalyst for thermal power plants, characterized in that: By mass percentage, the raw materials include the following components: gluconate 5-20%, diol 10-20%, citrate 5-13%, oxygen-containing free radical organic matter 3-10%, molasses 1-3%, dispersant 0.1-1%, and deionized water to make up the balance; The dispersant is polyethylene glycol monostearate and 18-crown ether-6 in a mass ratio of 1:1; The oxygen-containing free radical organic compounds are , where n=1 or 2; the mass ratio of the citrate to the oxygen-containing free radical organic compound is 7~11:5~8; The mass ratio of the gluconate to the diol is 9~14:13~16; The citrate is at least one of ferric citrate and copper citrate.

2. The coal-saving catalyst for thermal power plants according to claim 1, characterized in that: The gluconate is at least one of sodium gluconate, calcium gluconate, potassium gluconate, and ferrous gluconate.

3. The coal-saving catalyst for thermal power plants according to claim 2, characterized in that: The diol is at least one of ethylene glycol, propylene glycol, butanediol, and pentanediol.

4. A method for preparing a coal-saving catalyst for thermal power plants according to any one of claims 1 to 3, characterized in that: The steps include the following steps: (1) According to the formula ratio, first dissolve gluconate, citrate, oxygen-containing free radical organic matter, and dispersant in water at 55~75℃, stir until dissolved, and then cool; (2) Then add the formula ratio of diol and molasses and stir until evenly mixed to obtain the final product.

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