Cascade utilization system for tail gas waste heat of suspension calcining furnace

Abstract

The utility model provides a gradient utilization system for tail gas waste heat of a suspension calcining furnace, and belongs to the technical field of suspension calcining furnaces. Comprising a combustion device, the combustion device comprises a suspension calcining furnace, a plurality of feeding ports are formed in the edge of the outer surface of the suspension calcining furnace, a connecting pipe is fixedly connected to the center of the upper end face of the suspension calcining furnace, and a cyclone separator is fixedly connected to an outlet in the other side of the connecting pipe; an inlet of the upper end face of the cyclone separator is connected with a four-stage suspension preheater, and a waste gas outlet of the four-stage suspension preheater is connected with a thermal power generator. Heat of tail gas released by combustion is recycled through a suspension preheating process, heat loss caused by exhaust of the tail gas is reduced, heat for cooling materials is recycled through an internal suspension cooling process, heat loss caused by the fact that heat is taken away after a product is formed is reduced, and the service life of the product is prolonged. And the calcining temperature of the calcining furnace is reduced to 900 DEG C through multi-stage cooling and recycling, so that the service life of the device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of suspension calcining furnaces, in particular to a suspension calcining furnace tail gas waste heat cascade utilization system. Background Art

[0002] In recent years, global environmental change and energy depletion have received serious attention from governments and environmental groups. Due to the large-scale development of industry, petrochemical products are used in large quantities, and about four-fifths of the global energy supply structure comes from fossil fuels. Among them, fossil fuels used by industry and energy industries emit the most CO2. If the emitted CO2 can be effectively captured or stored, the carbon dioxide content in the air can be greatly reduced.

[0003] The existing suspension calcining furnace tail gas waste heat cascade utilization system can refer to the utility model patent with Chinese patent announcement number CN217127294U, which discloses a calcium carbide suspension calcination system, including a drying crusher, a suspension preheater, a high-temperature calcining furnace and a suspension cooler, and the suspension preheater and the suspension cooler are both provided with three levels; the drying crusher outlet is connected to the suspension preheater feed, the calcium carbide slag is first subjected to two-stage preheating treatment, and then enters the high-temperature calcining furnace for calcination in stages, and the burned lime enters the third-stage preheating cyclone for gas-solid separation and is collected, and then enters the suspension cooler for cooling; the cooling air is heated step by step through the three-stage cooling cylinder and then enters the calcining furnace in stages, and then the flue gas enters the third and second-stage preheating cyclones in turn and then enters the drying crusher to provide it with a drying heat source, and the flue gas finally enters the chimney through the outlet of the first-stage preheating cyclone and is discharged; the calcium carbide slag suspension calcination system of the present invention can realize the graded calcination of calcium carbide slag and fuel, and the utilization efficiency of heat energy and calcium carbide slag is high.

[0004] However, during the actual use of the device, it was found that although the above device improved the utilization rate of thermal energy, it did not solve the problems of exhaust gas pollution to the environment and waste of thermal energy. Therefore, the present application provides a suspended calcining furnace exhaust gas waste heat cascade utilization system to meet the needs. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a suspension calcining furnace tail gas waste heat cascade utilization system to solve the existing tail gas waste heat pollution to the environment and waste of resources.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A suspension calciner tail gas waste heat cascade utilization system comprises: a combustion device, wherein the combustion device comprises a suspension calciner, a plurality of feed ports are provided at the edge of the outer surface of the suspension calciner, a connecting pipe is fixedly connected to the center of the upper end surface of the suspension calciner, a cyclone separator is fixedly connected to the outlet on the other side of the connecting pipe, a four-stage suspension preheater is connected to the inlet of the upper end surface of the cyclone separator, a thermal generator is connected to the exhaust gas outlet of the four-stage suspension preheater, and a multi-stage suspension cooler is connected to the outlet at the lower end of the cyclone separator.

[0008] A pipeline is provided on one side of the outer surface of the multi-stage suspension cooler to connect with the suspension calcining furnace, and a cold air inlet is provided on the upper end surface of the multi-stage suspension cooler.

[0009] The upper end surface of the four-stage suspension preheater is provided with a limestone powder inlet, and another pipeline on the lower end surface of the four-stage suspension preheater is connected to a feed inlet at the edge of the outer surface of the suspension calcining furnace.

[0010] The multi-stage suspension coolers are all arranged in parallel in two rows in series, and the four-stage suspension preheaters are all arranged in parallel in two rows.

[0011] The multiple feed ports are connected to multiple fuel pipes.

[0012] The thermal generator is capable of generating electricity from thermal energy.

[0013] Compared with the prior art, the utility model has at least the following beneficial effects:

[0014] 1. In the above scheme, the device recovers the waste heat of the exhaust gas released by combustion through a suspended preheating process, effectively reducing the heat loss caused by exhaust gas. The heat of the material after cooling is recovered through a suspended cooling process inside the device, effectively reducing the heat loss caused by taking away the heat after the product is formed.

[0015] 2. In the above scheme, the device reduces the calcination temperature of the calcining furnace from 1200°C to 900°C through multi-stage cooling and recycling, which extends the service life of the device and effectively reduces the capital loss caused by frequent equipment replacement. The exhaust gas outlet of the four-stage suspension preheater is connected to a thermal generator, which can use the waste heat of the exhaust gas to generate electricity and save energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0017] Figure 1 This is a schematic diagram of the working process of the suspended calcining furnace tail gas waste heat cascade utilization system.

[0018] [Reference Signs]

[0019] 1. Combustion device; 101. Suspension calcining furnace body; 102. Feed inlet; 103. Connecting pipe; 104. Cyclone separator; 2. Four-stage suspension preheater; 3. Multi-stage suspension cooler; 4. Thermal generator.

[0020] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0021] The following is a detailed description of the suspension calcining furnace tail gas waste heat cascade utilization system provided by the utility model in combination with the drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are listed as the best and preferred embodiments, and other alternatives can also be used by technicians in some known technical fields; and the drawings are only for more specific description of the embodiments, and are not intended to specifically limit the utility model.

[0022] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0023] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0024] It will be understood that the meaning of “on,” “over,” and “above” in this disclosure should be interpreted in the broadest manner, so that “on” means not only “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” means not only “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0025] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0026] like Figure 1 As shown, the embodiment of the utility model provides a suspension calcining furnace tail gas waste heat cascade utilization system, including: a combustion device 1, the combustion device 1 includes a suspension calcining furnace body 101, a plurality of feed ports 102 are opened at the edge position of the outer surface of the suspension calcining furnace body 101, a connecting pipe 103 is fixedly connected to the center position of the upper end surface of the suspension calcining furnace body 101, a cyclone separator 104 is fixedly connected to the outlet of the other side of the connecting pipe 103, a four-stage suspension preheater 2 is connected to the inlet of the upper end surface of the cyclone separator 104, and a thermal generator is connected to the exhaust gas outlet of the four-stage suspension preheater 2. The motor 4 and the multi-stage suspension cooler 3 are connected to the lower outlet of the cyclone separator 104. The suspension calcining furnace body 101 uses the energy transmitted by the fuel and other exhaust gases for calcination. The feed port 102 is used to connect multiple fuels and other devices. The connecting pipe 103 connects the cyclone separator 104 and the suspension calcining furnace body 101 to transfer heat energy. The cyclone separator 104 separates and collects raw material powder. The four-stage suspension preheater 2 cools the limestone powder four times and generates waste heat. The thermal generator 4 can generate thermal energy through the exhaust gas heat of the four-stage suspension preheater 2.

[0027] like Figure 1 As shown, a pipe is provided on one side of the outer surface of the multi-stage suspension cooler 3 to connect to the suspension calcining furnace body 101, and a cold air inlet is provided on the upper end surface of the multi-stage suspension cooler 3. The pipe connected to the multi-stage suspension cooler 3 is used to transfer the heat emitted by the multi-stage suspension cooler 3 during cooling, and the cold air inlet allows air to enter the interior of the multi-stage suspension cooler 3 for cooling.

[0028] like Figure 1As shown, a limestone powder inlet is provided on the upper end surface of the four-stage suspension preheater 2, and another pipeline on the lower end surface of the four-stage suspension preheater 2 is connected to a feed port 102 at the edge of the outer surface of the suspension calcining furnace body 101. The limestone powder inlet enables the limestone powder to enter the four-stage suspension preheater 2 for preheating. The pipeline connected to the four-stage suspension preheater 2 is used to transfer the heat energy generated by the four-stage suspension preheater 2.

[0029] like Figure 1 As shown, the multi-stage suspension coolers 3 are all placed in parallel in two rows in series, and the four-stage suspension preheaters 2 are all placed in parallel in two rows. The multi-stage suspension coolers 3 are arranged in series to achieve the maximum cooling effect, and the four-stage suspension preheaters 2 are placed in parallel to achieve the maximum preheating effect.

[0030] like Figure 1 As shown, the multiple feed ports 102 are connected to multiple fuel pipes, and the multiple fuel pipes can be used to deliver multiple fuels to make the combustion more complete.

[0031] like Figure 1 As shown, the thermal generator 4 can generate electricity through thermal energy. The thermal generator 4 can achieve the effect of saving energy by generating electricity through thermal energy.

[0032] The technical solution provided by the utility model is that during operation, cold air first enters the multi-stage suspension cooler 3 for preheating, and cools the powdered lime at the same time, and then enters the suspension calcining furnace body 101 for combustion assistance, and the hot tail gas (900°C) carries the powder out from the top and enters the cyclone separator 104, the powder falls, the tail gas goes upward, and enters the four-stage suspension preheater 2 (four-time cooling) to preheat the limestone powder, and the tail gas (380°C) enters the thermal generator 4 to generate electricity using waste heat, the raw material (limestone powder) is first preheated in the four-stage suspension preheater 2, and then enters the suspension calcining furnace body 101 after preheating, and enters the cyclone separator 104 after calcination is completed, and the heavy powdered lime falls downward and is cooled in the multi-stage suspension cooler 3 to generate finished powdered lime.

[0033] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0034] A person skilled in the art will appreciate that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A suspension calcining furnace tail gas waste heat cascade utilization system, characterized in that: include: A combustion device (1), the combustion device (1) comprising a suspension calcining furnace body (101), a plurality of feed ports (102) being provided at the edge of the outer surface of the suspension calcining furnace body (101), a connecting pipe (103) being fixedly connected to the center of the upper end surface of the suspension calcining furnace body (101), a cyclone separator (104) being fixedly connected to the outlet on the other side of the connecting pipe (103), a four-stage suspension preheater (2) being connected to the inlet at the upper end surface of the cyclone separator (104), a thermal generator (4) being connected to the exhaust gas outlet of the four-stage suspension preheater (2), and a multi-stage suspension cooler (3) being connected to the outlet at the lower end of the cyclone separator (104).

2. The suspension calcining furnace tail gas waste heat cascade utilization system according to claim 1 is characterized in that: One side of the outer surface of the multi-stage suspension cooler (3) is provided with a pipeline connected to the suspension calcining furnace body (101), and the upper end surface of the multi-stage suspension cooler (3) is provided with a cold air inlet.

3. The suspension calcining furnace tail gas waste heat cascade utilization system according to claim 1 is characterized in that: The upper end surface of the four-stage suspension preheater (2) is provided with a limestone powder inlet, and another pipeline on the lower end surface of the four-stage suspension preheater (2) is connected to a feed inlet (102) at the edge of the outer surface of the suspension calcining furnace body (101).

4. The suspension calcining furnace tail gas waste heat cascade utilization system according to claim 1 is characterized in that: The multi-stage suspension coolers (3) are all arranged in two rows in series, and the four-stage suspension preheaters (2) are all arranged in two rows in parallel.

5. The suspension calcining furnace tail gas waste heat cascade utilization system according to claim 1 is characterized in that: The plurality of feed ports (102) are connected to a plurality of fuel pipes.

6. The suspension calcining furnace tail gas waste heat cascade utilization system according to claim 1, characterized in that: The thermal generator (4) is capable of generating electricity through thermal energy.

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