Coal-saving catalyst and method for preparing the same

Abstract

The present application relates to C21B, more particularly, the present application relates to a coal-saving catalyst and a preparation method thereof.The preparation raw material of the coal-saving catalyst comprises combustion improver 11-16%, oxygen supplier 9-13%, exciter 13-17%, stabilizer 5-8%, dispersing agent 1-2%, and the balance is water, and the total amount is 100% by weight percentage.The coal-saving catalyst provided by the present application is added with the dispersing agent, which is beneficial to penetrate into the inside of coal, at the same time, promotes the oxygen supplier, the stabilizer, the combustion improver and the like to cover the surface of the coal powder particles and split and surround the coal powder particles, so that the catalyst can be used for coal combustion and cement processing for a long time.The present application has good catalytic effect, saves resources and reduces cost.

Description

TECHNICAL FIELD

[0001] The present application relates to C21B, more particularly, the present application relates to a coal-saving catalyst and a preparation method thereof. BACKGROUND

[0002] Coal as one of the main fuels in cement processing, the performance of its fuel largely determines the economic benefit of a cement enterprise. But with the rapid increase in the use of coal and the decline in coal reserves, the current coal supply is becoming increasingly tight, so it is necessary to provide a catalyst that can save coal while maintaining stable quality.

[0003] And under the increasing trend of the importance of pollution, coal-using enterprises have a certain coal reduction task every year. Among them, as a major consumer of coal, the heat consumption of ton of cement clinker is about 100 kg of standard coal, and the annual national cement clinker output is more than 1.3 billion tons, so the annual consumption of standard coal is more than 1.3 billion tons, equivalent to 1.82 million tons of 5000 big coal, and the energy saving potential is huge. The coal consumption per ton of clinker is related to the operation time of the kiln of the cement enterprise and the clinker output, and each cement enterprise invests a large amount of resources in technical research and improvement to reduce the coal consumption per unit of clinker.

[0004] CN1834213 provides a coal combustion additive containing combustion improver and fatty alcohol polyoxyethylene polyoxypropylene block polyether sulfate and / or fatty alcohol polyoxyethylene ether sulfate to improve the combustion efficiency of stabilizer and coal. However, the combustion effect of the coal-saving catalyst is difficult to maintain during long-term use, and problems such as slagging may occur, so it is a problem to be solved to provide a coal-saving catalyst to reduce the energy consumption in the process of obtaining cement clinker sintering. SUMMARY

[0005] In order to solve the above problems, the first aspect of the present application provides a coal-saving catalyst, the preparation raw materials of the coal-saving catalyst include combustion improver 11-16%, oxygen supplier 9-13%, excitation agent 13-17%, stabilizer 5-8%, dispersing agent 1-2%, and the balance is water, the total amount is 100%.

[0006] As a preferred technical solution of the present application, the preparation raw materials of the coal-saving catalyst include combustion improver 11%, oxygen supplier 9%, excitation agent 13%, stabilizer 5%, dispersing agent 1%, and the balance is water, the total amount is 100%.

[0007] As a preferred technical solution of the present application, the preparation raw materials of the coal-saving catalyst include combustion improver 16%, oxygen supplier 13%, excitation agent 17%, stabilizer 8%, dispersing agent 2%, and the balance is water, the total amount is 100%.

[0008] As a preferred technical scheme of the present application, the preparation raw material of the coal-saving catalyst comprises combustion improver 13%, oxygen supplier 12%, exciter 14%, stabilizer 7%, dispersant 1%, and the balance is water, with the total amount being 100% by weight percentage.

[0009] As a preferred technical scheme of the present application, the preparation raw material of the coal-saving catalyst comprises combustion improver 15%, oxygen supplier 10%, exciter 15%, stabilizer 6%, dispersant 1%, and the balance is water, with the total amount being 100% by weight percentage.

[0010] As a preferred technical scheme of the present application, the combustion improver is selected from one or more of nitrophenol, dimethylbenzene, ethylene glycol monobutyl ether, methyl methacrylate, methyl tert-butyl ether, and methyl acetate, and is preferably at least one of methyl tert-butyl ether and methyl acetate.

[0011] As a preferred technical scheme of the present application, the oxygen supplier is selected from one or more of chlorate, acetate, permanganate, and dichromate, and is preferably at least one of chlorate and acetate.

[0012] As a preferred technical scheme of the present application, the acetate is selected from one or more of calcium acetate, sodium acetate, and potassium acetate, and is preferably calcium acetate; and the chlorate is selected from one or more of potassium chlorate, sodium chlorate, and calcium chlorate, and is preferably sodium chlorate.

[0013] As a preferred technical scheme of the present application, the exciter is C2-C5 polyol, and the number of hydroxyl groups in the C2-C5 polyol is 2-3.

[0014] As a preferred technical scheme of the present application, the C2-C5 polyol is selected from one or more of pentanediol, propanediol, ethylene glycol, and glycerol, and is preferably ethylene glycol and glycerol.

[0015] As a preferred technical scheme of the present application, the stabilizer is selected from one or more of copper salt, cerium salt, and zinc salt, and is preferably copper salt.

[0016] As a preferred technical scheme of the present application, the copper salt is selected from one or more of copper nitrate, copper sulfate, and copper acetate, and is preferably copper nitrate and copper sulfate; and the cerium salt is selected from one or more of cerium nitrate, cerium sulfate, and cerium phosphate.

[0017] As a preferred technical scheme of the present application, the dispersant is selected from one or more of C12-C16 alkyl trimethyl ammonium halide such as cetyl trimethyl ammonium chloride, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, and fatty alcohol polyoxyethylene ether, and is preferably sodium dodecyl sulfate and sodium dodecyl benzene sulfonate.

[0018] The second aspect of the present application provides a preparation method of the coal-saving catalyst, comprising: mixing the combustion-supporting agent, the oxygen-providing agent, the excitation agent, the stabilizing agent and the dispersing agent in water to obtain the coal-saving catalyst.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] (1) The coal-saving catalyst provided by the present application is added with a dispersing agent, which is beneficial to penetrate into the inside of coal while promoting the covering of the surface of coal by the oxygen-providing agent, the stabilizing agent and the combustion-supporting agent, and cutting and surrounding the coal powder particles. Thus, in a high-temperature environment, the combustion-supporting agent itself generates micro-explosion energy under high temperature, so that the deep-level coal powder is exposed to an oxygen atmosphere during the combustion process. On the one hand, the unburned coal is completely combusted through secondary catalysis, reducing volatile matter and fine coal powder. On the other hand, the oxygen-providing agent releases oxygen under the action of heat, promoting the flow of oxygen and supplementing oxygen, so that the metal ion catalyst obtained by decomposition of the oxygen-providing agent further promotes the formation and strengthening of carbon-oxygen double bonds, so that the combustion reaction of coal continues uninterruptedly, thereby promoting the long-term use of the catalyst for coal combustion and cement processing.

[0021] (2) In addition, the present inventors have found that, by using the dispersing agent and the combustion-supporting agent, excitation agent, the distribution of the oxygen-providing agent and the stabilizing agent is promoted, and the addition and amount of the oxygen-providing agent and the stabilizing agent are controlled, and the decomposition rate of the oxygen-providing agent is also controlled, so that the oxygen gas obtained by decomposition of the oxygen-providing agent is continuously transferred from the metal to the carbon atom, promoting the improvement of the diffusion speed of oxygen, thereby promoting the combustion of fixed carbon, thereby avoiding the increase of combustion by-products caused by the low solubility and unstable activity of the oxygen-providing agent, and promoting the stability of long-term cement quality and power generation capacity.

[0022] (3) In addition, by adding the excitation agent, a large amount of heat is released during its combustion, and oxygen ions are also provided, thereby indirectly reducing the activation energy during coal combustion and accelerating the combustion reaction. In addition, the addition of the excitation agent, the combustion-supporting agent and the dispersing agent system also promotes the stable combustion effect and avoids the influence of water in the coal-saving agent on transportation and grinding.

[0023] (4) At the initial stage of adding the coal-saving catalyst, the coal consumption and cement quality are often difficult to guarantee, but the coal-saving catalyst provided by the present application can effectively promote the maintenance of coal consumption and cement quality at the initial stage, thereby avoiding the influence of water, oxygen atmosphere or combustion efficiency on the complete sintering of coal when the coal-saving catalyst is initially added.

[0024] (5) The coal-saving catalyst provided by the present application has good catalytic effect, which not only saves resources but also reduces costs. DETAILED DESCRIPTION

[0025] EMBODIMENT

[0026] Example 1

[0027] Coal-saving catalyst and its preparation method, its raw material composition: combustion improver 11%, oxygen supply agent 9%, excitation agent 13%, stabilizer 5%, dispersing agent 1%, the balance is water, total amount 100%. The combustion improver is methyl methacrylate, methyl acetate with a weight ratio of 1:1; the oxygen supply agent is calcium acetate and potassium permanganate with a weight ratio of 1:1; the excitation agent is ethylene glycol, pentanediol with a weight ratio of 1:1; the stabilizer is copper sulfate, and the dispersing agent is cetyltrimethylammonium chloride.

[0028] According to the formula proportion, the combustion improver, oxygen supply agent, excitation agent, stabilizer, dispersing agent are dissolved in water and uniformly mixed to obtain product 1.

[0029] Example 2

[0030] Coal-saving catalyst and its preparation method, its raw material composition: combustion improver 16%, oxygen supply agent 13%, excitation agent 17%, stabilizer 8%, dispersing agent 2%, the balance is water, total amount 100%. The combustion improver is methyl methacrylate, methyl acetate with a weight ratio of 1:1; the oxygen supply agent is calcium acetate and potassium permanganate with a weight ratio of 1:0.5; the excitation agent is ethylene glycol, pentanediol with a weight ratio of 2:1; the stabilizer is copper sulfate, and the dispersing agent is cetyltrimethylammonium chloride.

[0031] According to the formula proportion, the combustion improver, oxygen supply agent, excitation agent, stabilizer, dispersing agent are dissolved in water and uniformly mixed to obtain product 2.

[0032] Example 3

[0033] Coal-saving catalyst and its preparation method, its raw material composition: combustion improver 13%, oxygen supply agent 12%, excitation agent 14%, stabilizer 7%, dispersing agent 1%, the balance is water, total amount 100%. The combustion improver is methyl tert-butyl ether, methyl acetate with a weight ratio of 1:2; the oxygen supply agent is calcium acetate and calcium chlorate with a weight ratio of 1:1; the excitation agent is ethylene glycol, glycerol with a weight ratio of 1:1; the stabilizer is cerium nitrate, and the dispersing agent is sodium dodecyl benzene sulfonate, fatty alcohol polyoxyethylene ether AEO9 with a weight ratio of 2:1.

[0034] According to the formula proportion, the combustion improver, oxygen supply agent, excitation agent, stabilizer, dispersing agent are dissolved in water and uniformly mixed to obtain product 3.

[0035] Example 4

[0036] Coal-saving catalyst and preparation method thereof, raw material composition: combustion improver 15%, oxygen supplier 10%, activator 15%, stabilizer 6%, dispersant 1%, the balance is water, the total amount is 100%. The combustion improver is methyl tert-butyl ether, methyl acetate in a weight ratio of 1:2; the oxygen supplier is calcium acetate and calcium chlorate in a weight ratio of 1:1; the activator is ethylene glycol and glycerol in a weight ratio of 1:1; the stabilizer is cerium nitrate, and the dispersant is sodium dodecyl benzene sulfonate and fatty alcohol polyoxyethylene ether AEO9 in a weight ratio of 2:1.

[0037] According to the formula proportion, the combustion improver, the oxygen supplier, the activator, the stabilizer and the dispersant are dissolved in water and uniformly mixed to obtain product 4.

[0038] Performance evaluation

[0039] 1. Coal-saving effect test: the coal-saving catalyst provided in example 2 is added to the coal mill inlet belt scale by a metering pump at a rate of 1‰, and the data of the experimental group with catalyst and the blank sample without catalyst are compared to obtain the coal-saving effect, and the specific scheme is as follows:

[0040] (1) Blank sample test: the statistical data from November 8, 2021 to November 14, 2021 are taken as the blank sample.

[0041] (2) Experimental group test: from 6:00 on December 1, 2021 to 15:58 on December 10, 2021, as the experimental group, the results are shown in Table 1.

[0042] Table 1

[0043]

[0044] Among them, the coal powder heat value and the feeding amount during the experiment are lower than those of the blank sample, and the cylinder temperature rises obviously after the experiment starts, indicating that the temperature in the kiln is obviously improved. As can be seen from Table 1, the coal-saving catalyst product provided by the application has obvious effect in the experiment, and the standard coal consumption is saved by 3.36 kg / t, and the standard coal consumption is saved by 1.88 kg / t.

[0045] 2. Coal-saving effect test: the coal-saving catalyst provided in example 4 is used in a kiln with a designed capacity of 2500t / d and a coal pipe mill for 2500t / d coal-saving test, wherein the test time is from December 5, 2021 to December 12, 2021, and is divided into three periods, namely: blank period (3 days), transition period (1 day) and adding period (3 days), and the conditions of the three periods are observed, and the specific test process is as follows:

[0046] 5 day 0:00-8 day 8:00 is blank test phase, 8 day 10:00 begins to join our company's coal-saving agent, and the adding amount is 1 ‰ of coal mill table time, until 8 day 24:00 is transition phase, 9 day 0:00 begins to enter test phase, during the period, open and stop coal mill in time and open and stop coal-saving agent, 12 day 8:00 stops test, and the production situation statistics table during the test is seen table 2, 3.

[0047] Table 2

[0048]

[0049]

[0050] Table 3

[0051]

[0052]

[0053] In addition, in the transition period, it is observed whether the moisture in the added coal-saving agent affects the normal operation of the coal powder preparation system, and it is found that the system can operate normally, and from table 2, 3, it is found that the moisture and the heat value remain consistent, the coal consumption per ton of clinker in the blank test phase is 140.07 Kg / t, and the coal consumption per ton of clinker in the agent test phase is 136.78 Kg / t, and the coal consumption per ton of clinker in the agent test phase is reduced by 3.29 Kg / t compared with the blank test phase.

Claims

1. A coal saving catalyst characterized by comprising: The preparation raw material of the coal-saving catalyst comprises combustion improver 11-16%, oxygen supplier 9-13%, exciter 13-17%, stabilizer 5-8%, dispersing agent 1-2%, and the balance is water, and the total amount is 100% by weight percentage; The combustion improver is selected from one or more of nitrophenol, dimethylbenzene, ethylene glycol monobutyl ether, methyl methacrylate, methyl tert-butyl ether and methyl acetate; The oxygen supplier is selected from one or more of chlorate, acetate, permanganate and dichromate; The exciter is C2-C5 polyhydric alcohol, and the number of hydroxyl groups in the C2-C5 polyhydric alcohol is 2-3; The stabilizer is selected from one or more of copper salt, cerium salt and zinc salt; The copper salt is selected from one or more of copper nitrate, copper sulfate and copper acetate; the cerium salt is selected from one or more of cerium nitrate, cerium sulfate and cerium phosphate; The dispersing agent is one or more of C12-C16 alkyl trimethyl ammonium halide, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and fatty alcohol polyoxyethylene ether.

2. The coal saving catalyst according to claim 1, characterized by, The C2-C5 polyhydric alcohol is selected from one or more of pentanediol, propanediol, ethylene glycol and glycerol.

3. A process for the preparation of a coal saving catalyst according to any one of claims 1 to 2, characterized by, It comprises: Mixing the combustion improver, the oxygen supplier, the exciter, the stabilizer, the dispersing agent and water to obtain the coal-saving catalyst.

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