Sintering kiln for ceramic colored sand

Abstract

The invention discloses a sintering kiln for ceramic colored sand. The sintering kiln comprises four independent temperature zones including a preheating zone, a high-temperature sintering zone, a slow cooling zone and a rapid cooling zone. In the high-temperature sintering area, silicon molybdenum rods and infrared radiation plates are arranged in a staggered manner, so that the heating uniformity is improved; and the inner wall is provided with a 310S heat-resistant stainless steel liner and is coated with an aluminum oxide coating, so that the heat resistance is enhanced. The preheating area utilizes waste heat of the high-temperature sintering area for preheating, a multi-layer heat preservation structure is adopted, and the heat utilization rate is improved. And centrifugal fans are arranged at the tops of the slow cooling area and the rapid cooling area, airflow distribution is optimized by combining an annular flow guide cover and an inclined flow guide plate, and the cooling efficiency is improved. And the rapid cooling area adopts a double-layer stainless steel water cooling interlayer and is provided with a spiral flow deflector to optimize the cooling effect. According to the invention, the sintering uniformity is effectively improved, the energy utilization is optimized, the cooling control is enhanced, the environmental pollution is reduced, and the method is suitable for industrial production of the high-performance ceramic color sand.

Description

Technical Field

[0001] The invention relates to a sintering kiln for ceramic colored sand. Background Art

[0002] Ceramic colored sand is a high-performance material widely used in architectural decoration, coatings and composite materials. Its preparation process directly affects its color stability, weather resistance and mechanical strength. In the production process of ceramic colored sand, sintering is a key link. The temperature control, energy utilization and cooling method of the sintering process directly determine the quality and production efficiency of the product. The existing ceramic colored sand sintering kiln still has many shortcomings in terms of temperature uniformity, energy consumption control, cooling efficiency, etc. For example, traditional kilns are prone to problems such as large temperature difference and low heat exchange efficiency during high-temperature sintering, resulting in unstable product performance. At the same time, the existing cooling system often cannot achieve precise temperature control, affecting the final quality of sintered colored sand. In addition, the exhaust gas treatment system is not perfect, which affects environmental protection requirements. Therefore, there is an urgent need for a ceramic colored sand sintering kiln that can improve temperature uniformity, optimize energy utilization, enhance cooling efficiency and take environmental protection into account to improve product quality and production efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the above deficiencies in the prior art and to provide a sintering kiln for ceramic colored sand.

[0004] A sintering kiln for ceramic colored sand comprises a kiln body, wherein the kiln body is divided into four independent temperature zones, namely a preheating zone, a high-temperature sintering zone, a slow cooling zone and a fast cooling zone; silicon-molybdenum rods and infrared radiation plates are arranged alternately on the top and side walls of the high-temperature sintering zone; an inner liner of 310S heat-resistant stainless steel is arranged on the inner wall of the high-temperature sintering zone; an alumina coating is coated on the surface of the inner liner; an insulation layer structure is arranged in the preheating zone; raw materials in the preheating zone are preheated by utilizing the residual heat of the high-temperature sintering zone; the insulation layer structure comprises an inner layer of ceramic fiber felt, an intermediate layer of nano aerogel sheet material and an outer layer of calcium silicate sheet; centrifugal fans are arranged on the tops of the slow cooling zone and the fast cooling zone; an annular guide hood is arranged at the air outlet of the fan for guiding the airflow to flow downward along the side wall of the kiln body; an inclined guide plate is arranged on the side wall of the kiln body; an outer shell of the fast cooling zone is coated with a double-layer stainless steel water-cooled interlayer; a spiral guide vane for extending the cooling water path is arranged in the interlayer; and a hydrophobic coating is coated on the inner wall of the interlayer.

[0005] As a further improvement, the bottom of the kiln body is provided with a plurality of groups of adjustable gas nozzles, through which N 2 , O 2 , Ar mixed gas.

[0006] As a further improvement, a waste gas outlet pipe is provided on the top of the high-temperature sintering zone, and the waste gas outlet pipe is connected to the alkali solution spray tower.

[0007] As a further improvement, the temperature range of the preheating zone is set to 200-600°C, and a step-by-step temperature rise design is adopted. The maximum temperature of the high-temperature sintering zone is ≤1250°C, and the temperature fluctuation range is ≤3°C. The temperature range of the slow cooling zone is set to 500-200°C, and the natural cooling rate is ≤5°C / min. The fast cooling zone cools the ceramic colored sand temperature to below 80°C.

[0008] As a further improvement, the high temperature sintering zone is provided with an array of spoiler columns for breaking the laminar boundary layer and enhancing the heat exchange efficiency.

[0009] As a further improvement, each independent temperature zone is provided with a high temperature resistant ceramic fiber curtain to reduce crosstalk between hot zones.

[0010] Beneficial effects:

[0011] Temperature zone optimization and heat energy recovery: The four independent temperature zones of preheating zone, high-temperature sintering zone, slow cooling zone and fast cooling zone are adopted to improve the temperature control accuracy of the sintering process. The waste heat of the high-temperature sintering zone is used for preheating in the preheating zone to improve the utilization rate of heat energy and reduce energy consumption.

[0012] Uniform heating and efficient heat transfer: The high-temperature sintering area adopts a staggered arrangement of silicon molybdenum rods and infrared radiation plates to achieve uniform heating, reduce temperature differences, and improve product quality. In addition, a 310S heat-resistant stainless steel liner is used, and an alumina coating is applied on the surface of the liner to improve heat resistance and heat conduction efficiency.

[0013] Efficient insulation and heat loss control: The preheating zone adopts a multi-layer insulation structure, including ceramic fiber felt, nano aerogel board and calcium silicate board, which greatly reduces heat loss and improves the thermal stability of the kiln.

[0014] Optimized cooling and precise temperature control: Centrifugal fans are installed on the top of the slow cooling zone and the fast cooling zone, which are combined with an annular guide cover and inclined guide plates to optimize airflow distribution and ensure cooling uniformity; the fast cooling zone adopts a double-layer stainless steel water-cooled interlayer, combined with spiral guide vanes to improve cooling efficiency, and a hydrophobic coating is used to reduce scaling and extend equipment life.

[0015] Atmosphere control and quality optimization: The bottom of the kiln is equipped with an adjustable gas nozzle, which can be used to introduce N 2 , O 2 , Ar and other mixed gases to optimize the sintering environment and reduce the impact of oxidation or other chemical reactions on the color and performance of ceramic colored sand.

[0016] Environmentally friendly emissions and improved energy efficiency: A waste gas outlet pipe is installed on the top of the high-temperature sintering area and is connected to an alkali liquid spray tower to effectively remove pollutants in the waste gas, reduce environmental impact, and improve the sustainability of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural block diagram of a sintering kiln for ceramic colored sand; DETAILED DESCRIPTION

[0018] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0019] like Figure 1 As shown, a sintering kiln for ceramic colored sand comprises:

[0020] 1. Kiln structure

[0021] The kiln body consists of four independent temperature zones: preheating zone, high temperature sintering zone, slow cooling zone and fast cooling zone. Each temperature zone is isolated by a high temperature resistant ceramic fiber curtain to reduce crosstalk between hot zones. An adjustable gas nozzle is provided at the bottom of the kiln body to control the atmosphere of the sintering environment.

[0022] 2. Preheating area

[0023] The temperature range of the preheating zone is set at 200-600℃, and a step-by-step heating method is adopted to heat the raw materials evenly and reduce thermal shock. A multi-layer insulation structure is set inside, including ceramic fiber felt, nano aerogel board and calcium silicate board, to reduce heat loss and improve heat utilization efficiency.

[0024] 3. High temperature sintering area

[0025] The maximum temperature of the high-temperature sintering zone can reach 1250℃, and the temperature fluctuation is guaranteed to be ≤3℃. Silicon molybdenum rods and infrared radiation plates are arranged alternately on the top and side walls to optimize heat transfer and improve sintering uniformity. The inner wall adopts 310S heat-resistant stainless steel liner and is coated with alumina coating to enhance heat resistance and thermal radiation performance. In addition, an array of spoiler columns is arranged inside the high-temperature sintering zone to break the laminar boundary layer and improve heat exchange efficiency, thereby optimizing the sintering effect.

[0026] 4. Slow cooling zone and fast cooling zone

[0027] The temperature range of the slow cooling zone is set to 500-200°C, and the cooling rate is ≤5°C / min to reduce thermal stress and reduce the risk of cracking and deformation of ceramic colored sand. The fast cooling zone is further cooled to below 80°C. Its shell adopts a double-layer stainless steel water-cooled interlayer and built-in spiral guide vanes to extend the flow path of cooling water and improve cooling efficiency. The inner wall of the interlayer is coated with a hydrophobic coating to reduce scale deposition and improve equipment durability. In addition, centrifugal fans are installed on the top of the slow cooling zone and the fast cooling zone, combined with an annular guide cover and inclined guide plates to optimize airflow distribution and ensure uniform cooling.

[0028] 5. Waste gas treatment system

[0029] A waste gas outlet pipe is provided on the top of the high-temperature sintering area and is connected to an alkali solution spray tower to remove harmful substances in the waste gas, reduce environmental pollution and improve environmental protection performance.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sintering kiln for ceramic colored sand, characterized in that: The invention comprises a kiln body, which is divided into four independent temperature zones: a preheating zone, a high-temperature sintering zone, a slow cooling zone and a fast cooling zone. Silicon-molybdenum rods and infrared radiation plates are arranged alternately on the top and side walls of the high-temperature sintering zone. The inner wall of the high-temperature sintering zone is provided with an inner liner of 310S heat-resistant stainless steel, and the surface of the inner liner is coated with an alumina coating. An insulation layer structure is arranged in the preheating zone. The raw materials in the preheating zone are preheated by the residual heat of the high-temperature sintering zone. The insulation layer structure comprises an inner layer of ceramic fiber felt, an intermediate layer of nano aerogel sheet and an outer layer of calcium silicate sheet. Centrifugal fans are arranged on the tops of the slow cooling zone and the fast cooling zone. The air outlet of the fan is provided with an annular guide hood for guiding the airflow to flow downward along the side wall of the kiln body. The side wall of the kiln body is provided with an inclined guide plate. The outer shell of the fast cooling zone is covered with a double-layer stainless steel water-cooled interlayer, and a spiral guide vane for extending the cooling water path is arranged in the interlayer, and the inner wall of the interlayer is coated with a hydrophobic coating.

2. A sintering kiln for ceramic colored sand according to claim 1, characterized in that: The bottom of the kiln body is provided with a plurality of groups of adjustable gas nozzles, through which a mixed gas of N2, O2 and Ar is introduced.

3. A sintering kiln for ceramic colored sand according to claim 1, characterized in that: A waste gas outlet pipe is arranged on the top of the high temperature sintering zone, and the waste gas outlet pipe is connected to the alkali solution spray tower.

4. A sintering kiln for ceramic colored sand according to claim 1, characterized in that: The temperature range of the preheating zone is set to 200-600°C, and a step-by-step temperature rise design is adopted. The maximum temperature of the high-temperature sintering zone is ≤1250°C, and the temperature fluctuation range is ≤3°C. The temperature range of the slow cooling zone is set to 500-200°C, and the natural cooling rate is ≤5°C / min. The fast cooling zone cools the ceramic colored sand temperature to below 80°C.

5. A sintering kiln for ceramic colored sand according to claim 1, characterized in that: The high-temperature sintering zone is provided with a spoiler column array for breaking the laminar boundary layer and enhancing the heat exchange efficiency.

6. A sintering kiln for ceramic colored sand according to claim 1, characterized in that: Each independent temperature zone is provided with a high temperature resistant ceramic fiber curtain for reducing crosstalk between hot zones.

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