Ceramsite production line waste heat utilization system

Abstract

The utility model discloses a waste heat utilization system for a ceramsite production line, which comprises a gas-solid separation unit, a heat exchange unit and a heat energy distribution unit which are connected in sequence, and specifically comprises a bag-type dust collector, a composite heat exchanger, a drying machine and a circulating water pipeline. The method comprises the following steps: carrying out gas-solid separation on wet and dust-containing flue gas discharged from a ceramsite drying line through a bag-type dust collector; the purified flue gas enters a combined type heat exchanger for heat exchange, and after heat exchange, high-temperature dry and hot air is introduced into a drying machine and used for drying moisture-containing raw materials into dry materials; moisture-containing flue gas after heat exchange is discharged after reaching the standard after flue gas treatment, and meanwhile, circulating hot water output by the combined type heat exchanger can be used for supplying heat to office buildings and dormitory buildings, so that maximum energy utilization is realized. According to the scheme, the heat efficiency is remarkably improved through a waste heat gradient utilization structure, meanwhile, the comprehensive energy consumption is reduced, and the system has high energy conservation and emission reduction benefits and is worthy of wide application and popularization.

Description

Technical Field

[0001] This utility model relates to a waste heat utilization system for a ceramsite production line, belonging to the field of waste heat recovery and utilization technology. Background Technology

[0002] The main problems currently existing in the production and application of expanded clay aggregate production lines are, on the one hand, the inefficient use of waste heat, resulting in high energy consumption. For example, some rotary kiln calcining expanded clay aggregate production lines use single-cylinder coolers or no cooling equipment at all, directly unloading the high-temperature expanded clay aggregate from the kiln hood. Through natural cooling, a large amount of heat in the expanded clay aggregate is not recovered, leading to high heat consumption. According to relevant data on the temperature of kiln tail flue gas in shale and clay expanded clay aggregate plants, it is generally between 450 and 550℃. The heat loss carried away by the kiln tail flue gas is greater than the heat loss from the kiln shell surface, accounting for 21.8% of the total heat consumption, which has a significant impact. On the other hand, there is insufficient environmental emission treatment. Some calcining expanded clay aggregate production lines lack or have virtually no environmental dust collection facilities, or use simple water dust collection methods, causing environmental pollution. The factory workshops have high dust levels, which is detrimental to environmental protection and contributes to air pollution. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a waste heat utilization system for a ceramsite production line, which aims to improve the utilization efficiency of waste heat in the ceramsite production line.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A waste heat utilization system for a ceramsite production line, comprising a gas-solid separation unit, a heat exchange unit, and a heat energy distribution unit connected in sequence; the input end of the gas-solid separation unit is connected to the humid and dusty flue gas from the ceramsite production line; the heat energy distribution unit includes a dryer and a circulating water pipeline.

[0006] The heat exchange unit is a composite heat exchanger, with its high-temperature input end connected to the purified flue gas outlet of the gas-solid separation unit; the composite heat exchanger is provided with a first heat exchange channel and a second heat exchange channel; the input end of the first heat exchange channel is connected to ambient temperature air, and the output end is connected to the air inlet of the dryer, so that the heat-exchanged dry hot air is introduced into the dryer to dry the moist raw materials; the heat-using unit and the second heat exchange channel are connected to the circulating water pipeline.

[0007] Furthermore, the gas-solid separation unit is a bag filter dust collector, used to treat the moist and dusty flue gas discharged from the ceramsite drying line to achieve gas-solid separation.

[0008] The composite heat exchanger is a heat pipe heat exchange device, including a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is through which ambient temperature air is introduced for heat exchange, and the second heat exchange channel is through which humid flue gas is introduced, which is the hot flue gas channel. The first heat exchange channel and the second heat exchange channel are adjacent to each other for heat exchange.

[0009] Furthermore, the inlet cross-section of the hot flue gas passage is larger than the outlet cross-section.

[0010] Furthermore, the first heat exchange channel and the second heat exchange channel are symmetrically arranged with respect to the hot flue gas channel.

[0011] Furthermore, a secondary waste heat recovery device is installed after the circulating water pipeline, which can recover the waste heat after the circulating water is used for moisture-proof pretreatment of the raw material warehouse.

[0012] Furthermore, the dryer discharges humid and cold air, which is then connected to a flue gas purification device to ensure that the emitted flue gas meets environmental protection standards.

[0013] Furthermore, a waste gas treatment device is installed after the composite heat exchanger to treat the waste gas generated by the system and discharge it after it meets the standards.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: It employs a counter-flow heat pipe heat exchanger to treat low-temperature waste heat, achieving counter-flow heat exchange between high-temperature flue gas and air. This increases the heat exchange efficiency by more than 30% compared to traditional shell-and-tube heat exchangers. Furthermore, it distributes different levels of heat energy to corresponding scenarios, significantly improving the efficiency of waste heat recovery through staged recovery. A secondary waste heat recovery device is added at the end of the circulating water pipeline for moisture control in the raw material warehouse, maximizing energy utilization. A bag filter, combined with a post-drying dust collector, controls dust, and a flue gas treatment stage is added after the composite heat exchanger, achieving dual control of environmental emissions. This solution achieves a significant improvement in thermal efficiency through a waste heat cascade utilization structure, while simultaneously reducing overall energy consumption. It has high energy-saving and emission-reduction benefits and is worthy of widespread promotion and application. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the waste heat utilization system of the ceramsite production line of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the composite heat exchanger of this utility model. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, this utility model is a waste heat utilization system for a ceramsite production line. The system mainly consists of a gas-solid separation unit, a heat exchange unit, and a heat energy distribution unit connected in sequence.

[0019] The gas-solid separation unit takes the moist, dusty flue gas discharged from the ceramsite production line as input and mainly performs gas-solid separation to obtain purified, moist flue gas. For example, it is preferably a baghouse dust collector, which is conventional equipment in the field, and its structure and usage are very mature, so it will not be described in detail here. Generally, after the dusty flue gas from the ceramsite drying line is treated by the baghouse dust collector, the dust concentration can be reduced to 50 mg / Nm³. 3 the following.

[0020] The heat exchange unit is used to utilize the heat of the purified flue gas. In this embodiment, it is a composite heat exchanger, that is, it has a first heat exchange channel and a second heat exchange channel, which are used for gas and water heat exchange respectively.

[0021] The heat distribution unit is used to allocate the recovered heat to appropriate processes for reuse. In this embodiment, the heat distribution unit includes a dryer and circulating water pipelines.

[0022] This invention introduces purified flue gas from a gas-solid separation unit into a high-temperature input end of a composite heat exchanger. In the composite heat exchanger, ambient temperature air is introduced into the first heat exchange channel input end to exchange heat with the purified flue gas. The resulting dry, hot air is then sent to a dryer to dry the moist raw materials, fuels, and other materials fed into the dryer, achieving heat energy recovery. The dried materials can be directly used in a ceramsite production line.

[0023] The second heat exchange channel is connected to the circulating water pipeline, and the heating unit is also connected to the circulating water pipeline, realizing the circulation of water between the heating unit and the second heat exchange channel, and achieving heat energy recovery. This utility model heating unit can provide heating for office buildings, dormitories, etc.

[0024] Based on the above structure, this invention utilizes a composite heat exchanger for gas-water-gas dual-medium heat exchange of the purified flue gas. For a typical ceramsite production line, the purified flue gas temperature after gas-solid separation is around 130℃. After heat exchange in the composite heat exchanger, the temperature of the dry air entering the dryer is around 120℃. In the dryer, the dry air undergoes convective heat exchange with the moist material, reducing the material's moisture content from 25-30% to 8-12%. The temperature of the humid, cold air discharged from the dryer is around 50℃. After passing through the second heat exchange channel, the circulating hot water temperature is between 60℃ and 70℃, while the temperature of the circulating hot water after being utilized by the heating unit is between 45℃ and 50℃. The temperature of the humid flue gas requiring treatment discharged from the composite heat exchanger is around 60℃.

[0025] Further, refer to Figure 2As shown, the composite heat exchanger of this utility model is a heat pipe heat exchange device, including a first heat exchange channel 1-1 and a second heat exchange channel 1-2. The first heat exchange channel 1-1 is through which ambient temperature air is introduced, and the second heat exchange channel 1-2 serves as a hot flue gas channel through which humid flue gas is introduced. The first and second heat exchange channels are adjacent to each other, allowing for heat exchange between the ambient temperature air and the humid flue gas. A condensate pipe 1-3 is installed at the bottom of the device to drain the condensate generated during the heat exchange process.

[0026] Furthermore, the inlet cross-section of the hot flue gas passage is larger than the outlet cross-section. On the one hand, this can reduce flow resistance and energy loss; on the other hand, a reasonable cross-sectional gradient can extend the equipment life by 20% to 30%.

[0027] Furthermore, the first and second heat exchange channels are symmetrically arranged with respect to the hot flue gas channel. This is because it makes the flue gas flow more uniform, reduces pressure differential growth, improves stability, and also helps to distribute heat evenly and improve heat exchange efficiency.

[0028] Furthermore, a secondary waste heat recovery device is installed after the circulating water pipeline, which can recover the waste heat after the circulating water is used for moisture-proof pretreatment of the raw material warehouse. Specifically, the secondary waste heat recovery device is installed at the end of the circulating water return pipeline, close to the raw material warehouse, which can shorten the heat conduction path and reduce heat loss.

[0029] Furthermore, the dryer discharges humid and cold air, which is then connected to a flue gas purification device to ensure that the emitted flue gas meets environmental protection standards.

[0030] Furthermore, a waste gas treatment device is installed after the composite heat exchanger to treat the waste gas generated by the system and discharge it after it meets the standards.

[0031] The above examples are not exhaustive examples of the utility model, and the device of this utility model can also take many other forms. The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Although this utility model has been disclosed above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make any modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, shall still fall within the scope of the utility model's technical solution.

Claims

1. A system for utilizing waste heat from a ceramsite production line, characterized in that, The system is composed of sequentially connected gas-solid separation unit, heat exchange unit and heat energy distribution unit; the input end of the gas-solid separation unit is connected with the wet and dusty flue gas of the ceramsite production line; the heat energy distribution unit includes a drying machine and a circulating water pipeline; The heat exchange unit is a composite heat exchanger, the high-temperature input end of which is connected with the purified flue gas outlet of the gas-solid separation unit; the composite heat exchanger is provided with a first heat exchange channel and a second heat exchange channel; the input end of the first heat exchange channel is connected with normal-temperature air, and the output end is connected with the air inlet of the drying machine, so that the dry and hot air after heat exchange is introduced into the drying machine to dry the wet raw materials; the heat unit is connected with the second heat exchange channel and the circulating water pipeline.

2. The system for utilizing waste heat of a ceramsite production line according to claim 1, wherein, The gas-solid separation unit is a bag-type dust collector, which is used to treat the wet and dusty flue gas discharged from the ceramsite drying line, so as to realize gas-solid separation.

3. The system for utilizing waste heat of a ceramsite production line according to claim 1, wherein, The composite heat exchanger is a heat pipe type heat exchange device, which includes a first heat exchange channel and a second heat exchange channel; the first heat exchange channel is connected with normal-temperature air for heat exchange, and the second heat exchange channel is connected with wet flue gas; the first heat exchange channel and the second heat exchange channel are adjacent to each other for heat exchange.

4. The system for utilizing waste heat of a ceramsite production line according to claim 1, wherein, The circulating water pipeline is provided with a secondary waste heat recovery device, which recovers the waste heat after the use of the circulating water and uses the waste heat for moisture-proof pretreatment of the raw material warehouse.

5. The system for utilizing waste heat of a ceramsite production line according to claim 1, wherein, The drying machine discharges wet and cold air, which is connected with a flue gas purification device.

6. The system for utilizing waste heat of a ceramsite production line according to claim 1, wherein, The composite heat exchanger is provided with a waste gas treatment device, which is used to treat the waste gas generated by the system.

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