CN216005679U

CN216005679U - Energy-efficient boiling formula gypsum calcining machine

Info

Publication number: CN216005679U
Application number: CN202122385507.1U
Authority: CN
Inventors: 张路; 张宏伟; 李明; 晃阳; 王容飞; 王连伟; 杭琪; 王广兴
Original assignee: Tai'an Lufa Energy Saving And Environmental Protection Equipment Co ltd
Current assignee: Tai'an Lufa Energy Saving And Environmental Protection Equipment Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-03-11
Anticipated expiration: 2031-09-30

Abstract

The utility model relates to a high-efficiency energy-saving boiling type gypsum calcining machine, which comprises a first boiling furnace, a second boiling furnace and an air supply device communicated with the lower parts of furnace chambers of the first boiling furnace and the second boiling furnace, wherein a discharge port of the first boiling furnace is communicated with a feed port of the second boiling furnace, and exhaust pipelines communicated with a dust removal system and the furnace chambers are arranged at the tops of the first boiling furnace and the second boiling furnace; steam heat exchange tubes are arranged in the furnace chambers of the first fluidized bed furnace and the second fluidized bed furnace, the inlets of the steam heat exchange tubes in the first fluidized bed furnace are communicated with a steam supply system, and the outlets of the steam heat exchange tubes in the first fluidized bed furnace are communicated with the inlets of the steam heat exchange tubes in the second fluidized bed furnace. The utility model discloses a two-stage of material is calcined and the two-stage utilization of steam has practiced thrift the energy consumption by a wide margin, has realized calcining through the waste heat exchange coil who sets up and has discharged heat to the heating of natural air, makes the heat that calcines exhaust air and carry utilized, has improved air supply arrangement's air supply temperature, has further reduced the energy consumption of calcining the operation.

Description

Energy-efficient boiling formula gypsum calcining machine

Technical Field

The utility model relates to a gypsum calcination technical field especially involves a high-efficient energy-conserving boiling formula gypsum calcining machine.

Background

The semi-hydrated gypsum obtained by calcining dihydrate gypsum is a core process in the production of building gypsum. The conventional calcining mode is calcining in a fluidized bed furnace, a material bed is heated by a heat exchanger in the fluidized bed furnace, and the materials in the field are blown upwards by water vapor separated from dihydrate gypsum and a bottom air supply device to fluidize the materials in the fluidized bed furnace, so that the materials are fully mixed and exchanged heat, are high in and high out, and are continuously flowed by utilizing the height difference. And the water vapor discharged by calcination enters a dust remover system after passing through a gas collecting box at the upper part of the fluidized bed furnace. The boiling furnace has the advantages of low effective utilization rate of heat source, high temperature of discharged water vapor, high energy consumption and improved quality requirement on a filter bag of a dust remover.

Disclosure of Invention

The utility model discloses to prior art's not enough, provide a high-efficient energy-conserving boiling formula gypsum calcining machine, to the heat of heat source and the heat make full use of the outer humid air that arranges, the heat energy utilization efficiency when having improved to calcine, energy-conserving effect is better.

The utility model is realized by the following technical proposal, provides a high-efficiency and energy-saving boiling type gypsum calcining machine, which comprises a first boiling furnace, a second boiling furnace and an air supply device communicated with the lower parts of furnace chambers of the first boiling furnace and the second boiling furnace, wherein a discharge port of the first boiling furnace is communicated with a feed port of the second boiling furnace, and the top parts of the first boiling furnace and the second boiling furnace are respectively provided with an exhaust pipeline communicated with a dust removal system and the furnace chambers;

steam heat exchange tubes are arranged in the furnace chambers of the first fluidized bed furnace and the second fluidized bed furnace, the inlets of the steam heat exchange tubes in the first fluidized bed furnace are communicated with a steam supply system, and the outlets of the steam heat exchange tubes in the first fluidized bed furnace are communicated with the inlets of the steam heat exchange tubes in the second fluidized bed furnace.

According to the scheme, the first fluidized bed furnace and the second fluidized bed furnace are arranged, so that two-stage calcination of materials is realized, high-temperature steam provided by the steam supply system is firstly subjected to high-temperature calcination in the first fluidized bed furnace and then enters the second fluidized bed furnace for low-temperature calcination, secondary utilization of the steam is realized, anhydrous gypsum is avoided through the low-temperature calcination, and the stability of the product is improved; dust generated by calcination is led to a dust removal system through the arrangement of an exhaust pipeline, so that the pollution to the environment is avoided.

As optimization, the first fluidized bed furnace and the second fluidized bed furnace are internally provided with heat exchange boxes above the furnace chamber, a waste heat exchange coil is fixedly arranged in each heat exchange box, the air inlet end of each waste heat exchange coil extends out of the furnace chamber, the air outlet end of each waste heat exchange coil is communicated with the air inlet of the air supply device, and an air channel for communicating the exhaust pipeline with the furnace chamber is formed between the bodies of the waste heat exchange coils. The optimized scheme utilizes the wet air which is exhausted by calcined gypsum and is about 150 ℃ to heat the natural air in the waste heat exchange coil, and the heated air enters the lower part of the furnace chamber through the air supply device, thereby improving the air supply temperature of the air supply device, reducing the loss of steam heat and reducing the energy consumption.

As optimization, all set firmly the baffle from furnace chamber top downwardly extending in the furnace chamber of first fluidized bed furnace and second fluidized bed furnace, form material passageway between the lower extreme of baffle and the furnace chamber bottom, the discharge gate of first fluidized bed furnace, the feed inlet of second fluidized bed furnace and the discharge gate of second fluidized bed furnace all are located the material passageway top in vertical direction. This optimization scheme makes the material be the S type in vertical and flows through setting up the baffle, has prolonged the time of being heated and the mixing time of material, has further improved and has calcined the efficiency.

Preferably, a material returning valve is installed on the side wall of the furnace cavity of the first fluidized bed furnace and connected with a material returning pipeline extending to the material mixing device. This optimization scheme makes the hot material in the first fluidized bed furnace have a part to return to the compounding device through setting up material returning valve and material returning pipeline, carries out the primary heating to cold material in the compounding device through hot material and calcines, has improved and has calcined the effect.

Preferably, the material returning valve is positioned on the downstream side of the baffle in the first boiling furnace in the material conveying direction. The material returning valve of the optimization scheme is arranged, so that the returned material is ensured to have higher heat energy, and the preliminary preheating effect on the cold material is ensured.

As optimization, an air adjusting valve is arranged on the exhaust pipeline. The air adjusting valve is arranged in the optimized scheme, so that the air exhaust speed is adjusted, and the calcining requirement is met.

The utility model has the advantages that: the two-stage calcining of materials and the two-stage utilization of steam are realized, the energy consumption is greatly saved, the heating of the calcining exhaust heat to natural air is realized through the arranged waste heat exchange coil, the heat brought by the calcining exhaust air is utilized, the air supply temperature of the air supply device is improved, and the energy consumption of the calcining operation is further reduced.

Drawings

Fig. 1 is a schematic view of the flow structure of the present invention, and arrows in the figure indicate the flow direction of the material, the air flow and the steam.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

As shown in fig. 1, the high-efficiency and energy-saving boiling type gypsum calcining machine comprises a first boiling furnace, a second boiling furnace and a blower communicated with the lower parts of the furnace chambers of the first boiling furnace and the second boiling furnace, wherein the blower of the embodiment is a roots blower. The discharge port of the first fluidized bed furnace is communicated with the feed inlet of the second fluidized bed furnace, and the discharge port of the first fluidized bed furnace and the feed inlet of the second fluidized bed furnace are oppositely attached in the horizontal direction.

Exhaust pipelines communicated with the dust removal system and the furnace chamber are arranged at the tops of the first fluidized bed furnace and the second fluidized bed furnace, and air regulating valves are arranged on the exhaust pipelines so as to adjust the exhaust volume according to the calcination condition.

The steam heat exchange tubes are arranged in the furnace chambers of the first fluidized bed furnace and the second fluidized bed furnace, the inlet of the steam heat exchange tube in the first fluidized bed furnace is communicated with the steam supply system, the outlet of the steam heat exchange tube in the first fluidized bed furnace is communicated with the inlet of the steam heat exchange tube in the second fluidized bed furnace, the steam supply system provides high-temperature steam of about 1.3Mpa, the high-temperature steam enters the steam heat exchange tube in the second fluidized bed furnace after passing through the steam heat exchange tube in the first fluidized bed furnace, and finally the high-temperature steam flows out from the steam heat exchange tube in the second fluidized bed furnace.

All be equipped with the heat transfer case that is located the furnace chamber top in first fluidized bed furnace and the second fluidized bed furnace, the heat transfer incasement sets firmly waste heat exchange coil, and waste heat exchange coil's inlet end extends to outside the furnace chamber, and waste heat exchange coil's the end of giving vent to anger communicates with air supply arrangement's air intake, forms the wind channel of intercommunication exhaust pipeline and furnace chamber between waste heat exchange coil's the body.

All set firmly the baffle from furnace chamber top downwardly extending in the furnace chamber of first fluidized bed furnace and second fluidized bed furnace, form material passageway between the lower extreme of baffle and the furnace chamber bottom, the discharge gate of first fluidized bed furnace, the feed inlet of second fluidized bed furnace and the discharge gate of second fluidized bed furnace all are located material passageway top in vertical direction.

And a material returning valve is arranged on the side wall of the furnace cavity of the first fluidized bed furnace, is positioned on the downstream side of the baffle in the first fluidized bed furnace in the material conveying direction and is connected with a material returning pipeline extending to the material mixing device.

When the calcining machine of the embodiment is used, high-temperature steam firstly heats materials in a first fluidized bed furnace to finish constant-speed calcining, then enters a steam heat exchange tube in a second fluidized bed furnace to slowly calcine the materials, and the slowly calcined materials enter a cooling system. Part of materials in the first fluidized bed furnace return to the mixing device through the return valve and the return pipeline, and cold materials are heated in the mixing device, so that the temperature of the materials entering the calcining machine is increased, and the energy consumption is reduced; and meanwhile, the air is heated by utilizing the calcined exhaust heat, and the heated air enters the furnace chamber through the Roots blower, so that the heat exchange with steam is reduced, and the energy consumption is further reduced.

The constant-speed calcination section has the material temperature of 140-.

In the slow calcining stage, the materials are basically semi-hydrated gypsum and a small amount of residual dihydrate gypsum, and in the stage, the residual heat after steam expansion and steam exposure is used for continuously supplying dehydration reaction to the materials, and the semi-hydrated gypsum is not continuously dehydrated to generate anhydrous gypsum III due to high temperature.

Constant-speed calcination and slow-speed calcination refer to the difference of dehydration rates, which is related to the dehydration temperature, and the temperature of the material bed can be adjusted by controlling the steam pressure and flow in the heat exchange bed of the fluidized bed furnace. The steam pressure for constant-speed calcination is high, the low-temperature steam or condensed water for slow-speed calcination after constant-speed calcination work application is used, the temperature of the material bed is low, and the dehydration rate of the gypsum is greatly reduced. The dehydration time and the heat exchange amount of the gypsum are determined by the heat exchange volume and the heat exchange area of the calcining equipment, so that the fluidized bed furnace of the constant-speed and slow-speed calcining section needs to be designed and manufactured according to the dehydration time and the heat exchange amount of the process design.

Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.

Claims

1. The utility model provides a high-efficient energy-conserving boiling type gypsum calcining machine which characterized in that: the device comprises a first fluidized bed furnace, a second fluidized bed furnace and an air supply device communicated with the lower parts of furnace chambers of the first fluidized bed furnace and the second fluidized bed furnace, wherein a discharge hole of the first fluidized bed furnace is communicated with a feed hole of the second fluidized bed furnace, and exhaust pipelines communicated with a dust removal system and the furnace chambers are arranged at the tops of the first fluidized bed furnace and the second fluidized bed furnace;

2. An energy efficient boiling gypsum calcining machine as claimed in claim 1, wherein: all be equipped with the heat transfer case that is located the furnace chamber top in first fluidized bed furnace and the second fluidized bed furnace, the heat transfer incasement sets firmly waste heat exchange coil, and waste heat exchange coil's inlet end extends to outside the furnace chamber, and waste heat exchange coil's the end of giving vent to anger communicates with air supply arrangement's air intake, forms the wind channel of intercommunication exhaust pipeline and furnace chamber between waste heat exchange coil's the body.

3. An energy efficient boiling gypsum calcining machine as claimed in claim 1, wherein: all set firmly the baffle from furnace chamber top downwardly extending in the furnace chamber of first fluidized bed furnace and second fluidized bed furnace, form material passageway between the lower extreme of baffle and the furnace chamber bottom, the discharge gate of first fluidized bed furnace, the feed inlet of second fluidized bed furnace and the discharge gate of second fluidized bed furnace all are located material passageway top in vertical direction.

4. An energy efficient boiling gypsum calcining machine as claimed in claim 3, wherein: and a material returning valve is arranged on the side wall of the furnace cavity of the first fluidized bed furnace and connected with a material returning pipeline extending to the material mixing device.

5. An energy efficient boiling gypsum calcining machine as claimed in claim 4, wherein: the return valve is located on the downstream side of the baffle in the first boiling furnace in the material conveying direction.

6. An energy efficient boiling gypsum calcining machine as claimed in claim 1, wherein: an air adjusting valve is arranged on the exhaust pipeline.