Heat exchanging component made of ceramic materials and preparation method thereof

A technology of heat exchange elements and ceramic materials, applied in the field of heat exchange elements and their preparation, can solve the problems affecting the life of the heat exchanger in continuous operation of the production process, restricting the use range and application effect of the heat exchanger, fluid flow rate, flow rate, temperature, etc. Improper parameters and other problems, to achieve the effect of improving stability and equipment safety, reducing exhaust emission pollution, and small thermal expansion coefficient

Active Publication Date: 2013-10-09
广西蓝熵科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heat exchangers made of metal materials have relatively high requirements for ambient temperature, pH of the exchange medium, and fluid properties. If it cannot meet the function of direct heat exchange, it is necessary to add cooling equipment for indirect heat exchange, or increase investment to purchase a complete set of regenerative combustion technology and equipment for regenerative combustion; another example: widely used in industry, agriculture, service industries and other fields The temperature of flue gas emitted by gas-fired and oil-fired boilers is higher than 100°C according to the national standard design and use regulations. The main reason is that the fuel forms dry steam (H 2 O), when the temperature is below 100°C, the dry steam releases heat and liquefies to form water vapor, and the sulfide, nitrogen oxide, fluoride and other compounds formed at the same time during the combustion process are easily soluble in water vapor to form strong acid corrosive substances to metals , the equipment is damaged by corrosion, which seriously affects the continuous operation of the production process and the life of the heat exchanger; another example: water, oil and other liquid fluid heat exchange media contain solid-dissolved impurities or gaseous fluid heat exchange media such as flue gas and combustion-supporting air contain When dust, particles and other substances are used, the flow rate, flow rate, temperature and other parameters of the fluid are improper, and the heat exchanger will be worn out, which restricts the use range and application effect of the heat exchanger made of metal materials, and directly affects the heat exchanger equipment. life

Method used

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  • Heat exchanging component made of ceramic materials and preparation method thereof
  • Heat exchanging component made of ceramic materials and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: the preparation method of ceramic material and ceramic heat exchange element

[0051] Including raw material mixing - mixed grinding pulping - pouring molding - trimming blank - sintering into the furnace - sintering out of the furnace - inspection and warehousing steps.

[0052] (1) Mixing of raw materials:

[0053] The raw material ratio that present embodiment adopts is:

[0054] Silicon carbide (SiC) 72kg,

[0055] Silicon nitride (Si 3 N 4 ) 3 kg,

[0056] β-phase sialon (sialon) 3 kg,

[0057] Aluminum nitride (AlN) 3 kg,

[0058] Flux 3 kg (including magnesium oxide (MgO) 1kg, silicon (Si) powder 2kg),

[0059] Adhesive 15 kg (including 10 kg of clay, 1.5 kg of methyl cellulose, 2 kg of tung oil, 1.5 kg of paraffin),

[0060] The molding aid uses 1kg of alum.

[0061] (2) Mixed grinding and pulping:

[0062] Add the above raw materials and 40 kg of water into a ball mill, and mix and grind in the ball mill for 24 hours to make a mud slurry...

Embodiment 2

[0073] Embodiment 2: the preparation method of ceramic material and ceramic heat exchange element

[0074] Concrete operation process flow is with embodiment 1.

[0075] The ratio of raw materials selected in this embodiment is:

[0076] Silicon carbide (SiC) 80kg,

[0077] Silicon nitride (Si 3 N 4 ) 1 kg,

[0078] β-phase sialon (sialon) 1 kg,

[0079] Aluminum nitride (AlN) 1 kg,

[0080] Flux 1kg (including magnesium oxide (MgO) 0.5kg, silicon (Si) powder 0.5kg),

[0081] Adhesive 15 kg (including 10 kg of clay, 1.5 kg of polyvinyl alcohol, 2 kg of tung oil, 1.5 kg of paraffin),

[0082] The molding aid is 1kg of liquid silica gel.

[0083] The firing operation process of this embodiment is as follows: the blower blows air on the shell of the electric furnace until the temperature inside the electric furnace drops below 300°C, then opens the furnace door, continues to cool down naturally to a temperature that can be handled by workers, and then sends it out for in...

Embodiment 3

[0085] Embodiment 3: the preparation method of ceramic material and ceramic heat exchange element

[0086] Concrete operation steps are with embodiment 1.

[0087] The proportion of raw materials selected in this embodiment is: silicon carbide (SiC) 85kg,

[0088] Flux 1kg (including magnesia (MgO) 0.3kg, silicon (Si) powder 0.7kg),

[0089] Adhesive 14kg (including 9kg of Shuo soil, 1.5kg of polyvinyl alcohol, 2 kg of tung oil, 1.5 kg of paraffin wax),

[0090] In this example, a natural gas furnace is selected for sintering, and the trimmed blank is placed in a natural gas furnace, and the temperature is raised slowly and evenly to 800°C for 4 hours using a reducing flame, with a heating rate of 3.33°C / min, and after maintaining a constant temperature of 800°C for 2-3 hours Heating, using an oxidizing flame for firing, it is required to gradually and evenly raise the temperature to 1400°C within 5 hours of firing, the heating rate is 2°C / min, and the furnace is shut down ...

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Abstract

The invention discloses a heat exchanging component made of ceramic materials and a preparation method thereof, and more specifically relates to a ceramic material, a ceramic heat exchanging component, and preparation methods thereof, wherein the ceramic material has the properties of thermal shock property, corrosion resistance, wear resistance, low cost, high strength, high heat exchange efficiency, and the like. According to the invention, the ceramic material and the ceramic heat exchanging component are prepared through selecting 70-85% of silicon carbide, 0-5% of silicon nitride, 0-5% of theron, 0-5% of aluminum nitride, 0.9-3.2% of a fluxing agent, 10-20% of a binder and 0-2.5% of a forming additive; the heat exchanging component has good thermal conductivity and thermal shock properties, especially when the heat exchanging component is used for waste heat recovery, the temperature of tail gas discharged by oil and gas combustion can be reduced to a temperature below the water dew point, so that the sensible heat in the tail gas is fully recovered, and the latent heat of liquefaction of dry steam is recovered, therefore, the heat exchanging component made of ceramic materials and preparation method thereof disclosed by the invention provide a new technical route for a process for the effective governance of tail gas discharged by oil and gas combustion, and can be applied to a technical scheme of effectively preventing the formation of a haze weather caused by oil and gas combustion emissions.

Description

technical field [0001] The invention relates to a heat exchange element made of ceramic materials and a preparation method thereof, more specifically, to a heat exchange element with good thermal shock resistance, corrosion resistance, wear resistance, low cost, high strength, and high heat exchange efficiency. A ceramic material, a ceramic heat exchange element, and a method for preparing a ceramic heat exchange element using the ceramic material. Background technique [0002] In the technical equipment in the field of waste heat recovery and preheating combustion-supporting air, due to the strong thermal conductivity of metal materials, the heat exchange efficiency of heat exchangers made of metal materials is high. Most of the heat exchangers seen on the market are made of metal materials, such as : Rotary air preheater, shell and tube heat exchanger, shell and tube heat exchanger, partition wall heat exchanger, spiral heat exchanger, plate heat exchanger, heat pipe heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 李锦萍高坚珂高浩武越高源温晓光张睿张代东王延忠张剑仲曹毅轩张宏伟刘天柱闫志忠范毓仙
Owner 广西蓝熵科技开发有限公司
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