A soot cleaning agent for furnace tubes

Abstract

The application discloses a kind of furnace tube ash removal agent. It is constituted by the following components by weight fraction: 10-30 parts of composite inorganic salt, 10-30 parts of composite mineral aggregate, 5-10 parts of alkaline substance, 1-3 parts of catalyst, 3-8 parts of accelerator, 3-5 parts of corrosion inhibitor, 100-200 parts of water. The furnace tube ash removal agent of the application has the effect of removing hard ash, which forms a low-melting eutectic with the hard scale on the pipe wall, so that the hard ash becomes a loose and easily peeled product and falls off by itself; reduces carbon ion emission and improves combustion efficiency; while removing ash, a protective film is formed on the surface of the furnace tube, which also inhibits the deposition of ash; ash can be removed online without stopping production; eliminates dust pollution and its impact on the respiratory system, which is beneficial to environmental protection.

Description

Technical Field

[0001] This invention belongs to the field of boiler energy-saving ash removal technology, and specifically relates to a furnace tube ash removal agent. Background Technology

[0002] When solid or liquid fuels are burned in boilers and furnaces, ash and scale will adhere to various heating surfaces and flues inside the furnace. Ash accumulation on heating surfaces reduces the thermal efficiency of boilers and furnaces, increases energy consumption, and shortens their service life. Severe ash accumulation not only worsens heat exchange but also affects safe production due to increased flue resistance.

[0003] The cleaning agent for oil-fired or gas-fired boilers is a multi-component mixture containing sodium chloride, borax, silica, sodium carbonate, zinc oxide, and ferric nitrate. After being blown into the high-temperature zone of the furnace, the cleaning agent rapidly vaporizes and disperses with the airflow to various heated surfaces within the furnace, making full contact with the adhered ash and causing a series of chemical reactions. The low-melting-point, easily hydrolyzed and sublimated compounds generated during these reactions can cause the ash to form micropores, becoming brittle and easily pulverized and detached. The activation reaction can prevent the formation of sodium pyrosulfate and inhibit the production of low-melting-point sodium ferric sulfate, thus reducing the scaling rate on the furnace tube surface. The acid neutralization reaction can reduce the content of sulfur trioxide and sulfur dioxide in the flue gas. Some of the alkali metal cations produced by the reaction will adhere to the furnace tube surface, preventing the re-deposition of soot.

[0004] While current cleaning agents have some cleaning effect, they are not thorough, and ash accumulates again quickly after cleaning. The combustion temperature in the furnace is high, which wastes energy. Due to incomplete combustion, a lot of carbon particles and carbon monoxide gas are released into the atmosphere, as well as acidic sulfur dioxide and nitrogen oxides, polluting the atmospheric environment. Summary of the Invention

[0005] The purpose of this invention is to provide a furnace tube cleaning agent.

[0006] A furnace tube cleaning agent is composed of the following components in parts by weight: 10-30 parts of composite inorganic salt, 10-30 parts of composite mineral, 5-10 parts of alkaline substance, 1-3 parts of catalyst, 3-8 parts of accelerator, 3-5 parts of corrosion inhibitor, and 100-200 parts of water.

[0007] The composite inorganic salt is two or more of the following: sodium chloride, magnesium chloride, iron oxide, sodium sulfate, copper sulfate, and sodium nitrate.

[0008] The composite mineral is a mixture of potassium borate and leica in a mass ratio of 3:1.

[0009] The alkaline substance is two or more of sodium carbonate, potassium carbonate, borax, and sodium silicate.

[0010] The catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1.

[0011] The accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0012] The corrosion inhibitor is one or more of sodium lignosulfonate, sodium molybdate, hexamethylenetetramine, thiourea, and LAN-826.

[0013] The method for preparing the furnace tube cleaning agent involves crushing the composite inorganic salt, composite mineral, alkaline substance, catalyst, accelerator, and corrosion inhibitor separately, passing them through a 150-300 mesh sieve, mixing them, and then adding water and stirring evenly.

[0014] The beneficial effects of this invention are as follows: The furnace tube cleaning agent of this invention has the function of removing hard ash and scale. It forms a low-melting-point eutectic with the hard scale on the tube wall, thereby turning the hard ash and scale into a loose and easily peelable product that falls off on its own; it reduces carbon ion emissions and improves combustion efficiency; while removing ash and scale, it forms a black and shiny protective film on the surface of the furnace tube, which also inhibits the deposition of ash and scale; it can clean ash online without stopping the equipment; it eliminates dust pollution and its impact on the human respiratory system, which is beneficial to environmental protection. Detailed Implementation

[0015] To facilitate understanding of the present invention, a more comprehensive description will be given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0016] Example 1

[0017] A furnace tube cleaning agent comprises the following components in parts by weight: 10 parts sodium chloride, 10 parts copper sulfate, 24 parts composite mineral material, 7 parts sodium carbonate, 2 parts catalyst, 6 parts accelerator, 4 parts sodium molybdate, and 100-200 parts water; wherein the composite mineral material is a mixture of potassium borate and leica in a mass ratio of 3:1; the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0018] The method for preparing the furnace tube cleaning agent involves crushing sodium chloride, copper sulfate, composite minerals, sodium carbonate, catalyst, accelerator, and sodium molybdate separately, passing them through a 220-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0019] Example 2

[0020] A furnace tube cleaning agent comprises the following components in parts by weight: 6 parts magnesium chloride, 6 parts iron oxide, 12 parts composite mineral material, 5 parts borax, 1 part catalyst, 3 parts accelerator, 3 parts sodium lignosulfonate, and 100 parts water; wherein the composite mineral material is a mixture of potassium borate and leica in a mass ratio of 3:1; the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0021] The method for preparing the furnace tube cleaning agent involves crushing magnesium chloride, iron oxide, composite minerals, borax, catalyst, accelerator, and sodium lignosulfonate separately, passing them through a 150-mesh sieve, mixing them, and then adding water and stirring until homogeneous.

[0022] Example 3

[0023] A furnace tube cleaning agent comprises the following components in parts by weight: 15 parts sodium sulfate, 15 parts sodium nitrate, 30 parts composite mineral material, 10 parts potassium carbonate, 3 parts catalyst, 8 parts accelerator, 5 parts hexamethylenetetramine, and 200 parts water; wherein the composite mineral material is a mixture of potassium borate and leica in a mass ratio of 3:1; the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0024] The method for preparing the furnace tube cleaning agent involves crushing sodium sulfate, sodium nitrate, composite minerals, potassium carbonate, catalyst, accelerator, and hexamethylenetetramine separately, passing them through a 280-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0025] Comparative Example 1

[0026] A furnace tube cleaning agent comprises the following components in parts by weight: 10 parts sodium chloride, 10 parts copper sulfate, 24 parts potassium borate, 7 parts sodium carbonate, 2 parts catalyst, 6 parts accelerator, 4 parts sodium molybdate, and 100-200 parts water; wherein the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0027] The method for preparing the furnace tube cleaning agent involves crushing sodium chloride, copper sulfate, potassium borate, sodium carbonate, catalyst, accelerator, and sodium molybdate separately, passing them through a 220-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0028] Comparative Example 2

[0029] A furnace tube cleaning agent comprises the following components in parts by weight: 10 parts sodium chloride, 10 parts copper sulfate, 24 parts lykalinite, 7 parts sodium carbonate, 2 parts catalyst, 6 parts accelerator, 4 parts sodium molybdate, and 100-200 parts water; wherein the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0030] The method for preparing the furnace tube cleaning agent involves crushing sodium chloride, copper sulfate, Lycra, sodium carbonate, catalyst, accelerator, and sodium molybdate separately, passing them through a 220-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0031] Comparative Example 3

[0032] A furnace tube cleaning agent comprises the following components in parts by weight: 10 parts sodium chloride, 10 parts copper sulfate, 24 parts composite mineral material, 7 parts sodium carbonate, 2 parts cerium oxide, 6 parts accelerator, 4 parts sodium molybdate, and 100-200 parts water; wherein the composite mineral material is a mixture of potassium borate and leica in a mass ratio of 3:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0033] The method for preparing the furnace tube cleaning agent involves crushing sodium chloride, copper sulfate, composite minerals, sodium carbonate, cerium oxide, accelerator, and sodium molybdate separately, passing them through a 220-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0034] Comparative Example 4

[0035] A furnace tube cleaning agent comprises the following components in parts by weight: 10 parts sodium chloride, 10 parts copper sulfate, 24 parts composite mineral material, 7 parts sodium carbonate, 2 parts lanthanum oxide, 6 parts accelerator, 4 parts sodium molybdate, and 100-200 parts water; wherein the composite mineral material is a mixture of potassium borate and leica in a mass ratio of 3:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:1.

[0036] The method for preparing the furnace tube cleaning agent involves crushing sodium chloride, copper sulfate, composite minerals, sodium carbonate, lanthanum oxide, accelerator, and sodium molybdate separately, passing them through a 220-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0037] Comparative Example 5

[0038] A furnace tube cleaning agent comprises the following components in parts by weight: 10 parts sodium chloride, 10 parts copper sulfate, 24 parts composite mineral material, 7 parts sodium carbonate, 2 parts catalyst, 6 parts sodium humate, 4 parts sodium molybdate, and 100-200 parts water; wherein the composite mineral material is a mixture of potassium borate and leica in a mass ratio of 3:1; and the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1.

[0039] The method for preparing the furnace tube cleaning agent involves crushing sodium chloride, copper sulfate, composite minerals, sodium carbonate, catalyst, sodium humate, and sodium molybdate separately, passing them through a 220-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0040] Comparative Example 6

[0041] A furnace tube cleaning agent comprises the following components in parts by weight: 10 parts sodium chloride, 10 parts copper sulfate, 24 parts composite mineral material, 7 parts sodium carbonate, 2 parts catalyst, 6 parts manganese isooctanoate, 4 parts sodium molybdate, and 100-200 parts water; wherein the composite mineral material is a mixture of potassium borate and leica in a mass ratio of 3:1; and the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1.

[0042] The method for preparing the furnace tube cleaning agent involves crushing sodium chloride, copper sulfate, composite minerals, sodium carbonate, catalyst, manganese isooctanoate, and sodium molybdate separately, passing them through a 220-mesh sieve, mixing them, adding water, and stirring until homogeneous.

[0043] Experimental Example 1:

[0044] Referring to the "Static Performance Evaluation of Soot Remover for Oil-fired Boilers", 0.5g of each of the soot remover prepared in Examples 1-3 and Comparative Examples 1-4 was placed in a weighing porcelain crucible, and then 50g of residual oil was added. The crucible was placed in a vertical crucible furnace at a constant temperature of 650℃ and heated and burned for 1 hour. The crucible was then removed, cooled, and weighed.

[0045] In order to accurately determine the degree of sintering of ash and scale after residual oil combustion, the following three indicators are specified:

[0046] Shaking rate: H = m H / m×100%;

[0047] Bullet drop rate: T = m T / m×100%;

[0048] Dust removal rate: Z = H + T;

[0049] Where m is the weight gain of the crucible after combustion, i.e., the total slag amount; m H The weight of the ash that falls off when the crucible is inverted and gently shaken; m T The weight of the debris that falls off when lightly flicked by hand.

[0050] Each experiment was repeated 5 times and the average value was taken. Statistical analysis was performed using SPSS 24.0 software. Quantitative data were analyzed using... ±s (mean ± standard deviation) indicates that the normality of the data was tested using the Kolmogorov-Smirnov test. For normally distributed data, the difference between the means of two groups was compared using the t-test, and P < 0.05 was considered statistically significant.

[0051] The measurement results are shown in Table 1:

[0052] Table 1

[0053]

[0054]

[0055] Note: * indicates that compared with Example 1 group, P<0.05.

[0056] Experimental Example 2:

[0057] The experiment used three vertical box furnaces from China Petroleum & Chemical Corporation (Sinopec), with a design load of 58,000 kW and a total heat transfer area of ​​2,589 m². 2 The furnace was mainly powered by high-pressure gas and supplemented with atmospheric residue oil. After two years of operation, the furnace temperature increased from 710℃ (furnace 1), 712℃ (furnace 2), and 705℃ (furnace 3) to 815℃ (furnace 1), 813℃ (furnace 2), and 814℃ (furnace 3), respectively. When the vertical box furnace was operating normally, the cleaning agent prepared in Example 1, Comparative Example 5, and Comparative Example 6 was blown into the high-temperature zone of furnaces 1, 2, and 3. The amount of cleaning agent added was 1% of the mass of high-pressure gas. The cleaning agent was continuously added for 3 days. On the 4th day, the furnace temperature was measured. The furnace temperatures were 752℃, 789℃, and 791℃, respectively, with temperature drops of 63℃, 24℃, and 23℃, respectively.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A furnace tube cleaning agent, characterized in that, It is composed of the following components in parts by weight: 10-30 parts of composite inorganic salt, 10-30 parts of composite mineral, 5-10 parts of alkaline substance, 1-3 parts of catalyst, 3-8 parts of accelerator, 3-5 parts of corrosion inhibitor, and 100-200 parts of water; the composite mineral is a mixture of potassium borate and leica in a mass ratio of 3:1; the catalyst is a mixture of cerium oxide and lanthanum oxide in a mass ratio of 8:1; and the accelerator is a mixture of sodium humate and manganese isooctanoate in a mass ratio of 2:

1.

2. The furnace tube cleaning agent according to claim 1, characterized in that, The composite inorganic salt is two or more of the following: sodium chloride, magnesium chloride, iron oxide, sodium sulfate, copper sulfate, and sodium nitrate.

3. The furnace tube cleaning agent according to claim 1, characterized in that, The alkaline substance is two or more of sodium carbonate, potassium carbonate, borax, and sodium silicate.

4. The furnace tube cleaning agent according to claim 1, characterized in that, The corrosion inhibitor is one or more of sodium lignosulfonate, sodium molybdate, hexamethylenetetramine, thiourea, and LAN-826.

5. The method for preparing the furnace tube cleaning agent according to claim 1, characterized in that, The composite inorganic salt, composite mineral, alkaline substance, catalyst, accelerator, and corrosion inhibitor are crushed separately and passed through a 150-300 mesh sieve. After mixing, water is added and stirred evenly.

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