Ceramic kiln waste heat recovery drying system

Abstract

A ceramic kiln waste heat recovery drying system comprises a ceramic kiln, hot flue gas exhausted by the ceramic kiln is provided with two channels, one channel enters a first induced draft fan through a first automatic baffle valve, and the other channel sequentially enters a desulfurization, denitrification and dust removal device through a second automatic baffle valve installed on a pipeline to be treated and then is led to an emptying tower through a second induced draft fan. Hot air exhausted by the ceramic kiln is provided with two channels, one channel enters a first induced draft fan through a first automatic baffle valve, the other channel is led into an emptying tower through a fourth automatic baffle valve installed on a pipeline, an outlet of the first induced draft fan is communicated with a hot blast stove through a second baffle valve installed on the pipeline, and a burner is arranged below the hot blast stove. Fuel gas is introduced into the combustor through an air blower, an outlet of the hot blast stove is communicated with an inlet of the spray drying tower through a pipeline, and an outlet of the spray drying tower is communicated with an inlet of the desulfurization, denitrification and dust removal device. According to the system, the purposes of energy conservation and emission reduction are achieved through secondary utilization of hot air and hot flue gas.

Description

Technical Field

[0001] The present invention belongs to the technical field of ceramic kiln waste heat recovery and utilization equipment or devices, and particularly relates to a ceramic kiln waste heat recovery drying system. Background Art

[0002] At present, with the increasingly severe global energy pattern and environmental protection situation, the sustainable development of the ceramic industry faces huge challenges, especially the problem of waste heat utilization in ceramic kilns.

[0003] From the energy perspective, the reserves of traditional fossil fuels are gradually decreasing, and energy prices continue to rise. Ceramic production is a high-energy-consuming industry. As a key equipment, ceramic kilns consume a large amount of primary energy such as coal and natural gas during operation. According to statistics, in the total energy consumption of ceramic production, the energy consumption of roller kilns can account for 60%-80%. However, a considerable part of this huge energy consumption is directly discharged in the form of waste heat, resulting in serious energy waste. For example, the flue gas temperature of ceramic kilns is usually between 300-800°C, and the heat carried by the products in the cooling section is also quite considerable. If this waste heat cannot be effectively utilized, it will undoubtedly exacerbate the contradiction between energy supply and demand.

[0004] The continuous improvement of environmental protection requirements also brings new pressures to the ceramic industry. The direct discharge of waste heat not only wastes energy but also generates thermal pollution, having a negative impact on the surrounding environment and ecological system. At the same time, carbon emissions have become the focus of global attention. As one of the carbon emission sources, ceramic enterprises urgently need to take effective measures to reduce carbon emissions and achieve green production transformation.

[0005] At present, the current situation of waste heat utilization in ceramic kilns in the ceramic industry is not optimistic. Although some enterprises have tried to use waste heat in links such as green body drying, this utilization method has many limitations. On the one hand, the scope of waste heat utilization is narrow, only concentrated in a few links, and a large amount of waste heat has not been fully developed; on the other hand, the efficiency of existing waste heat utilization equipment and technologies is low, and it is difficult to achieve efficient recovery and conversion of waste heat. For example, common heat exchangers have problems such as low heat transfer efficiency, large equipment volume, and high maintenance costs in the heat exchange process, and cannot meet the needs of ceramic enterprises for in-depth waste heat utilization.

[0006] In addition, with the development of the ceramic industry, the market's requirements for the quality and output of ceramic products are constantly increasing. This requires improving production efficiency and product quality without increasing energy consumption and production costs. Developing efficient ceramic kiln waste heat utilization technologies can not only reduce energy costs, improve the economic benefits of enterprises, but also reduce environmental pollution and enhance the social image of enterprises, meeting the trends of industry development and the requirements of the national sustainable development strategy.

[0007] In summary, the research and development of new ceramic kiln waste heat utilization technology has an urgent practical need and broad application prospects. This application aims to address the deficiencies in the existing technology and provide an innovative solution for energy conservation, emission reduction, and sustainable development in the ceramic industry. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned existing technology and provide a ceramic kiln waste heat recovery and drying system with reasonable design, simple structure, high energy utilization rate, and the purpose of achieving energy conservation and emission reduction.

[0009] The technical solution adopted to solve the above technical problem is: a ceramic kiln waste heat recovery and drying system, including a ceramic kiln. The hot flue gas discharged from the ceramic kiln has two channels. One channel enters the first induced draft fan through the first automatic baffle valve, and the other channel enters the desulfurization, denitrification, and dust removal device through the second automatic baffle valve installed on the pipeline and is then led to the emptying tower by the second induced draft fan. The hot air discharged from the ceramic kiln has two channels. One channel enters the first induced draft fan through the first automatic baffle valve, and the other channel is introduced into the emptying tower through the fourth automatic baffle valve installed on the pipeline. The outlet of the first induced draft fan is connected to the hot blast stove through the second baffle valve installed on the pipeline. A burner is arranged below the hot blast stove, and the burner introduces fuel gas by a blower. The outlet of the hot blast stove is connected to the inlet of the spray drying tower through a pipeline, and the outlet of the spray drying tower is connected to the inlet of the desulfurization, denitrification, and dust removal device.

[0010] A ring pipe is arranged at each of the upper and lower natural air inlets of the hot blast stove of the present invention, and a number of quick-opening air dampers are arranged on the ring pipe.

[0011] An automatic control valve is arranged at the inlet of the ring pipe of the present invention.

[0012] Since the present invention adopts the method of introducing the hot flue gas and hot air from the ceramic kiln into the hot blast stove as the heat source of the spray drying tower, compared with the traditional technology in the ceramic factory where the hot flue gas from the ceramic kiln is directly discharged into the atmosphere after passing through the desulfurization, denitrification, and dust removal device, and the hot air from the ceramic kiln is directly discharged into the atmosphere, while the ceramic raw material slurry to be dried in the factory area is heated to the required hot air temperature of the spray drying tower by burning fuel gas with the burner below the hot blast stove and the ceramic raw material slurry is dried with the hot air, the above process method directly causes waste of heat, low energy utilization rate, and thermal pollution. This system conducts secondary utilization to achieve the purpose of energy conservation and emission reduction. Brief Description of the Drawings

[0013] Figure 1 It is the process flow chart of the present invention.

[0014] In the figure: 1. Blower; 2. Fourth automatic baffle valve; 3. Ceramic kiln; 4. First automatic baffle valve; 5. First induced draft fan; 6. Second automatic baffle valve; 7. Burner; 8. Quick-opening air damper; 9. Loop pipe; 10. Hot blast stove; 11. Spray drying tower; 12. Desulfurization, denitrification and dust removal device; 13. Fourth automatic baffle valve; 14. Second induced draft fan. Specific embodiments

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0016] Embodiment 1

[0017] In Figure 1 , the ceramic kiln waste heat recovery drying system involved in the present invention includes a ceramic kiln 3. The hot flue gas discharged from the ceramic kiln 3 has two channels. One channel enters the first induced draft fan 5 through the first automatic baffle valve 4, and the other channel enters the desulfurization, denitrification and dust removal device 12 through the second automatic baffle valve 13 installed on the pipeline and is then led to the emptying tower by the second induced draft fan 14. The hot air discharged from the ceramic kiln 3 has two channels. One channel enters the first induced draft fan 5 through the first automatic baffle valve 4, and the other channel is introduced into the emptying tower through the fourth automatic baffle valve 2 installed on the pipeline. The outlet of the first induced draft fan 5 is connected to the hot blast stove 10 through the second baffle valve 6 installed on the pipeline. A burner 7 is arranged below the hot blast stove 10. The burner 7 introduces fuel gas by the blower 1. In order to introduce the hot air and hot flue gas into the hot blast stove 10 more smoothly, a circle of loop pipes 9 is arranged at the natural air inlets at the upper and lower parts of the hot blast stove 10. A number of quick-opening air dampers 8 are arranged on the loop pipes 9. An automatic control valve is arranged at the inlet of the loop pipes 9. According to the actual working conditions, the upper and lower loop pipes 9 can introduce hot air and hot flue gas separately, or the upper and lower loop pipes 9 can introduce hot air and hot flue gas together. The outlet of the hot blast stove 10 is connected to the inlet of the spray drying tower 11 through a pipeline, and the outlet of the spray drying tower 11 is connected to the inlet of the desulfurization, denitrification and dust removal device 12.

[0018] The working principle of the present invention is as follows:

[0019] When starting production in the factory area, it is necessary to first start the hot blast stove 10 to dry the raw materials in the spray drying tower 11 through hot air and then press them into blanks, and then fire them into finished products through the ceramic kiln 3. Therefore, when starting production for the first time, the ceramic kiln 3 is not started and there is no hot air or hot flue gas. It is necessary to use the burner 7 to burn and heat the air in the hot blast stove 10, and use the hot air to enter the spray drying tower 11 to dry the raw materials. After running for a period of time, after starting the ceramic kiln 3, hot air and hot flue gas are generated. Close the fourth automatic baffle valve 2 and the third automatic baffle valve 13, open the first automatic baffle valve 4, and start the first induced draft fan 5. The inlet and outlet baffle valves of the first induced draft fan 4 adjust the induced draft volume to control the kiln process without change. The first induced draft fan 5 sends the hot air and hot flue gas to the hot blast stove 10, which can enter from the upper annular pipe 9 of the hot blast stove 10, or from the lower annular pipe 9 of the hot blast stove 10, or enter from both the upper and lower parts at the same time. According to the process requirements, switch the automatic control valves of the upper and lower branch pipes. When the hot air or hot flue gas enters from a certain annular pipe 9, close the quick-opening damper 8 on the corresponding annular pipe 9. When the temperature of the waste heat flue gas or hot air is insufficient, use the burner 7 at the lower part of the hot blast stove 10 to heat the waste heat flue gas or hot air to the hot air temperature required by the spray drying tower 11.

Claims

1. A ceramic kiln waste heat recovery and drying system, comprising a ceramic kiln (3), characterized in that: The hot flue gas discharged from the ceramic kiln (3) has two channels, one of which enters the first induced draft fan (5) through a first automatic damper valve (4), and the other enters the desulfurization, denitration and dust removal device (12) in sequence through a second automatic damper valve (13) installed on the pipeline, and is then led to the venting tower by the second induced draft fan (14) after being processed. The hot air discharged from the ceramic kiln (3) has two channels, one of which enters the first induced draft fan (5) through the first automatic damper valve (4), and the other is led to the venting tower through a fourth automatic damper valve (2) installed on the pipeline. The outlet of the first induced draft fan (5) is connected to the hot blast furnace (10) through the second damper valve (6) installed on the pipeline. A burner (7) is arranged below the hot blast furnace (10), and fuel gas is introduced into the burner (7) by the blower (1). The outlet of the hot blast furnace (10) is connected to the inlet of the spray drying tower (11) through a pipeline, and the outlet of the spray drying tower (11) is connected to the inlet of the desulfurization, denitration and dust removal device (12).

2. The ceramic kiln waste heat recovery and drying system according to claim 1 is characterized in that: The hot air furnace (10) is provided with a ring pipe (9) at each of the upper and lower natural air inlets, and a plurality of quick-opening air doors (8) are provided on the ring pipe (9).

3. The ceramic kiln waste heat recovery and drying system according to claim 2 is characterized in that: An automatic control valve is arranged at the inlet of the ring pipe (9).

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