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 utility model belongs to the ceramic kiln waste heat recycling equipment or device technical field, specifically relates to a kind of ceramic kiln waste heat recovery drying system. BACKGROUND

[0002] In the current global energy pattern and environmental protection situation is increasingly severe, the sustainable development of ceramic industry faces great challenges, and the waste heat utilization problem of ceramic kiln is particularly prominent.

[0003] From the energy level, the reserves of traditional fossil energy are gradually decreasing, and the energy price continues to rise. Ceramic production is a high-energy-consuming industry, and ceramic kiln, as a key equipment, consumes a large amount of primary energy such as coal and natural gas during operation. According to statistics, the energy consumption of roller kiln accounts for 60%-80% of the total energy consumption of ceramic production. However, a considerable part of this huge energy is directly discharged in the form of waste heat, causing serious energy waste. For example, the exhaust gas temperature of ceramic kiln is usually between 300-800℃, and the heat carried by the product in the cooling section is also considerable. If these waste heat cannot be effectively utilized, it will undoubtedly exacerbate the energy supply and demand contradiction.

[0004] The increasing environmental protection requirements also bring new pressure to the ceramic industry. Direct discharge of waste heat not only wastes energy, but also causes thermal pollution, which has negative impact on the surrounding environment and ecological system. At the same time, carbon emissions have become a global focus, and ceramic enterprises, as one of the sources of carbon emissions, urgently need to take effective measures to reduce carbon emissions and realize green production transformation.

[0005] At present, the utilization status of ceramic kiln waste heat in the ceramic industry is not optimistic. Although some enterprises have tried to use waste heat for green body drying and other links, this utilization method has many limitations. On the one hand, the scope of waste heat utilization is narrow, and only a few links are involved, and a large amount of waste heat is not fully developed. On the other hand, the efficiency of existing waste heat utilization equipment and technology is low, and it is difficult to realize efficient recovery and conversion of waste heat. For example, the common heat exchanger has the problems of low heat transfer efficiency, large equipment volume and high maintenance cost in the heat exchange process, which cannot meet the demand of ceramic enterprises for deep utilization of waste heat.

[0006] In addition, with the development of ceramic industry, the market's demand for quality and quantity of ceramic products is increasing. This requires improving production efficiency and product quality without increasing energy consumption and production cost. Developing efficient ceramic kiln waste heat utilization technology can not only reduce energy cost and improve enterprise's economic benefit, but also reduce environmental pollution and enhance enterprise's social image.

[0007] In summary, there is an urgent need and broad application prospects for developing new ceramic kiln waste heat utilization technology, and the present application aims to solve the deficiencies in the prior art and provide an innovative solution for energy saving and emission reduction and sustainable development of the ceramic industry. SUMMARY

[0008] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art, and to provide a ceramic kiln waste heat recovery drying system which is reasonable in design, simple in structure, high in energy utilization rate and achieves the purpose of energy saving and emission reduction.

[0009] The technical solution adopted to solve the above technical problems is: a ceramic kiln waste heat recovery drying system, which comprises a ceramic kiln, and the hot flue gas discharged from the ceramic kiln has two channels, one of which passes through a first automatic damper valve to enter a first induced draft fan, and the other passes through a second automatic damper valve installed on the pipeline to enter a desulfurization and denitrification dust removal device in turn and then is introduced into a vent tower by a second induced draft fan, and the hot air discharged from the ceramic kiln has two channels, one of which passes through a first automatic damper valve to enter a first induced draft fan, and the other passes through a fourth automatic damper valve installed on the pipeline to enter the vent tower, the outlet of the first induced draft fan is connected with a hot blast stove through a second damper valve installed on the pipeline, a burner is arranged below the hot blast stove and is connected with a blower to introduce fuel gas, the outlet of the hot blast stove is connected with the inlet of a spray drying tower through a pipeline, and the outlet of the spray drying tower is connected with the inlet of the desulfurization and denitrification dust removal device.

[0010] The hot blast stove is provided with a ring pipe at each of the upper and lower natural air inlets, and a plurality of quick-opening air doors are arranged on the ring pipe.

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

[0012] In the present application, the hot flue gas and hot air discharged from the ceramic kiln are introduced into the hot blast stove as the heat source of the spray drying tower, compared with the traditional technology of the ceramic factory, in which the hot flue gas discharged from the ceramic kiln is directly discharged into the atmosphere after being treated by the desulfurization and denitrification dust removal device, and the hot air discharged from the ceramic kiln is directly discharged into the atmosphere, and the ceramic raw material slurry which needs 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 by hot air, the above process directly causes waste of heat and low energy utilization rate, and also causes thermal pollution, and the present system realizes secondary utilization to achieve the purpose of energy saving and emission reduction. BRIEF DESCRIPTION OF DRAWINGS

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

[0014] In the figure: 1, air 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 damper; 9, ring 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. DETAILED DESCRIPTION

[0015] The utility model will be made further detailed explanation in combination with the drawings and examples, but the utility model is not limited to these examples.

[0016] Example 1

[0017] In Figure 1 the utility model discloses a ceramic kiln waste heat recovery drying system, including ceramic kiln 3, the hot flue gas of ceramic kiln 3 has two passages, one passes through first automatic baffle valve 4 and enters first induced draft fan 5, another passes through the second automatic baffle valve 13 installed on the pipeline and enters desulfurization, denitrification and dust removal device 12 in turn and is led to vent tower by second induced draft fan 14 after processing, the hot air of ceramic kiln 3 has two passages, one passes through first automatic baffle valve 4 and enters first induced draft fan 5, another passes through fourth automatic baffle valve 2 installed on the pipeline and is led to vent tower, the outlet of first induced draft fan 5 is connected with hot blast stove 10 through the second baffle valve 6 installed on the pipeline, and hot blast stove 10 is below the setting burner 7, and burner 7 is led to fuel gas by air blower 1, in order to more smoothly lead hot air and hot flue gas into hot blast stove 10, a ring pipe 9 is arranged at the upper and lower natural air inlets of hot blast stove 10 respectively, a plurality of quick-opening dampers 8 are arranged on ring pipe 9, and automatic control valve is arranged at the inlet of ring pipe 9, according to actual working condition, hot air and hot flue gas can be separately led into hot blast stove 10 through upper and lower ring pipes 9, or hot air and hot flue gas can be jointly led into hot blast stove 10 through upper and lower ring pipes 9. The outlet of hot blast stove 10 is connected with the inlet of spray drying tower 11 through the pipeline, and the outlet of spray drying tower 11 is connected with the inlet of desulfurization, denitrification and dust removal device 12.

[0018] The working principle of the utility model is as follows:

[0019] When the factory area just starts production, the hot blast stove 10 needs to be started first to dry the raw materials in the spray drying tower 11 by hot air, and then press the blanks, and then burn them into finished products in the ceramic kiln 3. Therefore, when the production just starts, the ceramic kiln 3 is not started without hot air and hot flue gas, and the burner 7 needs to be used to heat the air in the hot blast stove 10, and the hot air is used to dry the raw materials in the spray drying tower 11. After a period of operation, the ceramic kiln 3 is started to produce hot air and hot flue gas, the fourth automatic baffle valve 2 and the third automatic baffle valve 13 are closed, the first automatic baffle valve 4 is opened, the first induced draft fan 5 is started, the first induced draft fan 4 inlet and outlet baffle valve adjusts the induced draft amount, and the kiln process is controlled 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 ring pipe 9 of the hot blast stove 10, or from the lower ring pipe 9 of the hot blast stove 10, or from the upper and lower ring pipes 9 at the same time, according to the process requirements, the upper and lower branch pipe automatic control valves are opened and closed, the hot air or hot flue gas enters from which ring pipe 9, and the corresponding quick-opening air door 8 on the ring pipe 9 is closed. When the temperature of the waste heat flue gas or hot air is insufficient, the burner 7 at the lower part of the hot blast stove 10 is used to heat the waste heat flue gas or hot air to the required hot air temperature of the spray drying tower 11.

Claims

1. A ceramic kiln waste heat recovery drying system comprising a ceramic kiln (3) characterized by: The hot flue gas discharged by the ceramic kiln (3) has two passages, one of which passes through the first automatic baffle valve (4) into the first induced draft fan (5), and the other of which passes through the second automatic baffle valve (13) installed on the pipeline into the desulfurization, denitrification and dust removal device (12) in turn and is then introduced into the vent tower by the second induced draft fan (14) after treatment. The hot air discharged by the ceramic kiln (3) has two passages, one of which passes through the first automatic baffle valve (4) into the first induced draft fan (5), and the other of which passes through the fourth automatic baffle valve (2) installed on the pipeline into the vent tower. The outlet of the first induced draft fan (5) is connected with the hot blast stove (10) through the second baffle valve (6) installed on the pipeline. The burner (7) is arranged below the hot blast stove (10) and is supplied with fuel gas by the air blower (1). The outlet of the hot blast stove (10) is connected with the inlet of the spray drying tower (11) through the pipeline. The outlet of the spray drying tower (11) is connected with the inlet of the desulfurization, denitrification and dust removal device (12).

2. The ceramic kiln waste heat recovery drying system of claim 1, wherein: A ring pipe (9) is arranged at each of the upper and lower natural air inlets of the hot blast stove (10). A plurality of quick-opening air doors (8) are arranged on the ring pipe (9).

3. The ceramic kiln waste heat recovery drying system of claim 2, wherein: An automatic control valve is arranged at the inlet of the ring pipe (9).

Images