CN105486096B - A kind of residual-heat utilization method and device of indirect heating type sintering system - Google Patents
A kind of residual-heat utilization method and device of indirect heating type sintering system Download PDFInfo
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- CN105486096B CN105486096B CN201410479807.8A CN201410479807A CN105486096B CN 105486096 B CN105486096 B CN 105486096B CN 201410479807 A CN201410479807 A CN 201410479807A CN 105486096 B CN105486096 B CN 105486096B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 68
- 238000005245 sintering Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 64
- 239000007789 gas Substances 0.000 claims abstract description 112
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 111
- 238000002485 combustion reaction Methods 0.000 claims abstract description 107
- 239000002994 raw material Substances 0.000 claims abstract description 79
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 75
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000003546 flue gas Substances 0.000 claims abstract description 71
- 239000000428 dust Substances 0.000 claims abstract description 25
- 239000000446 fuel Substances 0.000 claims abstract description 24
- 239000002918 waste heat Substances 0.000 claims description 45
- 239000002737 fuel gas Substances 0.000 claims description 15
- 235000012054 meals Nutrition 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- 235000019504 cigarettes Nutrition 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention belongs to the production fields of aluminium oxide, are specially a kind of residual-heat utilization method and device of indirect heating type sintering system.The device includes the pipeline connected between combustion chamber, raw material preheater, gas heat exchanger, air-water heat exchanger, flash vessel, saturation water-circulating pump and equipment, the high-temperature flue gas discharged by air-water heat exchanger using combustion chamber heats water at low temperature, prepare 0.1MPa~8.6MPa saturated vapors, and reduce smog discharge temperature, the high-temperature tail gas generated in high-temperature flue gas combination kiln can also be used to preheat the raw material into kiln jointly simultaneously, combustion air or gaseous fuel needed for the common preheated burning room of high-temperature tail gas generated in high-temperature flue gas combination kiln also can be used.The present invention can effectively recycle the partial heat in above-mentioned combustion product gases, kiln inner exhaust gas, saturated vapor is prepared to use for full factory, improve the efficiency of energy utilization of entire sintering system, reduce production cost, the own temperature of cigarette (tail) gas can be also reduced simultaneously, beneficial to processing and the discharge of gathering dust.
Description
Technical Field
The invention belongs to the field of production of aluminum oxide, and particularly relates to a method and a device for utilizing waste heat of an indirect heating type sintering system.
Background
In the production of alumina and other industrial production processes, under certain specific technological requirements, an indirect heating type sintering system is required to heat materials, and the heating system can ensure that the heated materials are in a closed space and are prevented from being polluted by foreign matters. However, the heating mode has low heat exchange efficiency, generates a large amount of high-temperature combustion flue gas and kiln tail gas, and if the waste heat recovery is not carried out on the high-temperature combustion flue gas and the kiln tail gas, a large amount of energy is wasted, and the energy consumption and the production cost of the whole production system are increased; meanwhile, if the temperature of the flue gas or the tail gas is not reduced, the standard emission of the flue gas or the tail gas is difficult.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for utilizing waste heat of an indirect heating type sintering system, which aims to recover partial heat of flue gas of a combustion chamber and tail gas in a kiln, can be used for preheating raw materials entering the kiln, can also be used for preheating fuel gas or combustion air entering the combustion chamber, and can also be used for preparing saturated water or saturated steam for other process flows of a whole plant through heat exchange with low-temperature water. In addition, the temperature of the flue gas and the tail gas can be reduced through heat exchange, and further dust collection treatment and emission are facilitated.
The technical scheme of the invention is as follows:
a waste heat utilization method of an indirect heating type sintering system comprises the following steps:
(1) high-temperature flue gas discharged from a kiln combustion chamber is conveyed to a gas-water heat exchanger through a pipeline, the high-temperature flue gas exchanges heat with low-temperature water in the gas-water heat exchanger, the temperature of the high-temperature flue gas is reduced while the water is heated to a saturated state of 0.1-8.6 MPa, the high-temperature flue gas enters the next step for continuous utilization or is emptied after dust collection, and saturated water is conveyed to other process flows for utilization or enters a flash evaporator through a pipeline and a saturated water circulating pump thereof to generate 0.1-8.6 MPa saturated steam, and is conveyed to other process flows for utilization;
(2) the tail gas exhausted from the kiln is sent to a raw material preheater through a pipeline, and exchanges heat with raw material before entering the kiln, combustion-supporting air before entering a combustion chamber or gas fuel before entering the combustion chamber, so that the raw material, the combustion-supporting air or the gas fuel is heated, the temperature of the tail gas is reduced, the tail gas enters the next process for continuous utilization or is exhausted after dust collection, the preheated raw material, the combustion-supporting air or the gas fuel enters the kiln or the combustion chamber, and part of high-temperature flue gas exhausted from the combustion chamber is pumped out to be mixed with the tail gas of the kiln to generate the common waste heat raw material, the combustion-supporting air or the gas fuel according to the requirement of working.
The waste heat utilization method of the indirect heating type sintering system comprises the steps that the temperature of high-temperature flue gas discharged from a combustion chamber is 400-1200 ℃, the temperature of tail gas discharged from the interior of a kiln is 120-1200 ℃, and low-temperature water is heated by a gas-water heat exchanger to generate 0.1-8.6 MPa of saturated water or saturated steam.
The waste heat utilization method of the indirect heating type sintering system is characterized in that the flue gas of the combustion chamber after heat exchange and temperature reduction through the gas-water heat exchanger and the raw material preheater enters the next working procedure for continuous utilization or is evacuated after dust collection.
The waste heat utilization method of the indirect heating type sintering system is characterized in that tail gas in the kiln after heat exchange and temperature reduction of the raw material preheater enters the next working procedure for continuous utilization or is exhausted after dust collection.
The waste heat utilization method of the indirect heating type sintering system comprises the steps that tail gas exhausted from the interior of a kiln is conveyed to a raw material preheater and a gas heat exchanger through pipelines, the tail gas exchanges heat with raw material before entering the kiln, combustion-supporting air before entering a combustion chamber or gas fuel before entering the combustion chamber, so that the raw material, the combustion-supporting air or the gas fuel is heated, the temperature of the raw material, the combustion-supporting air or the gas fuel is reduced, the raw material, the combustion-supporting air or the gas fuel enters the next step for continuous utilization or is exhausted after dust collection, the preheated raw material, the combustion-supporting air or the gas fuel enters the kiln or the combustion chamber, and part of high-temperature flue gas exhausted from the combustion chamber is extracted to be mixed with the.
The waste heat utilization method of the indirect heating type sintering system is characterized in that tail gas in the kiln after heat exchange and temperature reduction through the raw material preheater and the gas heat exchanger enters the next working procedure for continuous utilization or is emptied after dust collection.
The waste heat utilization method of the indirect heating type sintering system is characterized in that fresh air subjected to heat exchange and temperature rise through the gas heat exchanger is sent to other preheating systems to be continuously preheated or directly enters a combustion chamber of the indirect heating type sintering system to be used as combustion-supporting air.
The waste heat utilization method of the indirect heating type sintering system is characterized in that gas fuel heated by heat exchange of the gas heat exchanger is sent to other preheating systems to be continuously preheated or directly enters a combustion chamber of the indirect heating type sintering system to be combusted.
The waste heat utilization method of the indirect heating type sintering system is characterized in that 0.1-8.6 MPa of saturated water or saturated steam generated by heat exchange of a gas-water heat exchanger is sent to other heat exchange systems to be continuously heated or sent to other process flows for utilization.
The waste heat utilization method of the indirect heating type sintering system comprises the steps of enabling raw materials after heat exchange and temperature rise of the raw material preheater to enter other preheating systems for continuous preheating or directly entering a kiln for heating.
The waste heat utilization device of the indirect heating type sintering system special for the method comprises the following components: combustion chamber, gas-water heat exchanger, flash vessel, saturated water circulating pump, raw material preheater, the concrete structure is as follows:
a flue gas outlet pipeline of the combustion chamber is connected to an air inlet of the air-water heat exchanger, a branch pipe is arranged on a flue gas connecting pipeline of the combustion chamber and is connected with the raw material preheater, a saturated water outlet pipeline of the air-water heat exchanger is connected to the flash evaporator, the flash evaporator is connected with the saturated water circulating pump through a pipeline, the inlet end of the saturated water circulating pump is communicated with a saturated water outlet at the bottom of the flash evaporator, and the outlet end of the saturated water circulating pump is communicated with the saturated water inlet end of the air-water heat exchanger to form; the kiln tail gas outlet pipeline is connected to a raw material preheater, a flue gas inlet communicated with the combustion chamber is arranged on the raw material preheater, and a raw material outlet of the raw material preheater is connected to a kiln feed inlet.
The waste heat utilization device of the indirect heating type sintering system also comprises a gas heat exchanger, and a branch pipe is arranged on a flue gas connecting pipeline of the combustion chamber and is connected with the gas heat exchanger; the kiln tail gas outlet pipeline is connected to a gas heat exchanger, a flue gas inlet communicated with the combustion chamber is formed in the gas heat exchanger, and a hot air or fuel gas outlet of the gas heat exchanger is connected to a combustion air or fuel gas inlet of the combustion chamber.
The waste heat utilization device of the indirect heating type sintering system is a sintering device which indirectly heats a kiln through a combustion chamber.
The waste heat utilization device of the indirect heating type sintering system is characterized in that a heated kiln in the sintering system is a rotary kiln or a vertical furnace.
The waste heat utilization device of the indirect heating type sintering system is characterized in that the sintering system is a one-section kiln system or more than two-section kiln systems.
The waste heat utilization device of the indirect heating type sintering system has one or more than two smoke outlets of the combustion chamber.
The gas-water heat exchanger is a one-stage heat exchanger or more than two-stage heat exchangers.
The waste heat utilization device of the indirect heating type sintering system is characterized in that a raw material outlet of a raw material preheater is connected with a kiln feed inlet of the indirect heating type sintering system through a chute, a chute or a feeding system.
In the waste heat utilization device of the indirect heating type sintering system, the gas heat exchanger is a one-stage heat exchanger or more than two-stage heat exchangers.
In the waste heat utilization device of the indirect heating type sintering system, the gas heat exchanger is a shell-and-tube heat exchanger or a heat-pipe heat exchanger.
The design idea of the invention is as follows:
the invention relates to a method and a device for utilizing waste heat of an indirect heating type sintering system. In an indirect heating type sintering system, high-temperature flue gas discharged from a combustion chamber is used for heating low-temperature water through a gas-water heat exchanger to prepare 0.1-8.6 MPa saturated steam, the emission temperature of the flue gas is reduced, meanwhile, the high-temperature flue gas can be used for jointly preheating raw materials entering a kiln furnace with high-temperature tail gas generated in the kiln furnace or the furnace, and the high-temperature flue gas can also be used for jointly preheating combustion air or gas fuel required by the combustion chamber with the high-temperature tail gas generated in the kiln furnace.
The invention has the advantages and beneficial effects that:
1. in the invention, the combustion flue gas exchanges heat with low-temperature water through the gas-water heat exchanger, and saturated water or saturated steam is prepared by utilizing the heat of the high-temperature combustion flue gas and is used for the production flow, thereby effectively improving the energy utilization efficiency, reducing the energy consumption and the production cost of the whole plant, simultaneously reducing the self temperature of the flue gas and being beneficial to dust collection and emission treatment.
2. In the invention, the tail gas and part of the combustion flue gas in the kiln exchange heat with the raw material and the fuel gas or the combustion-supporting air entering the kiln through the raw material preheater and the gas heat exchanger, so that the temperature of the raw material, the fuel gas or the combustion-supporting air can be increased, the heating temperature difference can be reduced, the fuel consumption can be reduced, and the self temperature of the tail gas and the flue gas can be reduced, thereby being beneficial to dust collection and emission treatment.
In a word, the invention can effectively recover part of heat in the combustion flue gas and the tail gas in the kiln, prepare saturated steam for the whole plant, improve the energy utilization efficiency of the whole sintering system, reduce the production cost, reduce the self temperature of the flue gas (tail gas) and be beneficial to dust collection treatment and emission. The method has simple process and low equipment investment.
Drawings
FIG. 1 is a schematic view of a waste heat utilization apparatus of a sintering system according to embodiment 1 of the present invention;
in the figure: 11. a kiln; 12. a combustion chamber; 13. a gas-water heat exchanger; 14. a raw material preheater; 15. a flash evaporator; 16. a saturated water circulating pump.
FIG. 2 is a schematic view of a waste heat utilization apparatus of a sintering system in embodiment 2 of the present invention;
in the figure: 21. a first section of kiln; 22. a second stage kiln; 23. a first stage combustion chamber; 24. a second stage combustion chamber; 25. a gas-water heat exchanger; 26. a raw material preheater; 27. a gas heat exchanger; 28. a flash evaporator; 29. a saturated water circulating pump.
Detailed Description
In the specific implementation mode, the method for utilizing the waste heat of the indirect heating type sintering system comprises the steps that high-temperature flue gas discharged by a kiln combustion chamber is conveyed to a gas-water heat exchanger through a pipeline, the high-temperature flue gas exchanges heat with low-temperature water in the gas-water heat exchanger, the temperature of the high-temperature flue gas is reduced while the water is heated to a saturated state of 0.1-8.6 MPa, the high-temperature flue gas enters the next step for continuous utilization or is emptied after dust collection, and saturated water is conveyed to other process flows for utilization or enters a flash evaporator through a pipeline and a saturated water circulating pump thereof to generate 0.1-8.6 MPa saturated steam and is conveyed to; the tail gas exhausted from the kiln is sent to a raw material preheater and a gas heat exchanger through pipelines, and exchanges heat with raw material before entering the kiln, combustion-supporting air before entering a combustion chamber or gas fuel before entering the combustion chamber, so that the raw material, the combustion-supporting air or the gas fuel is heated, the temperature of the raw material, the combustion-supporting air or the gas fuel is reduced at the same time, the raw material, the combustion-supporting air or the gas fuel enters the next working procedure for continuous utilization or dust collection and then is exhausted, the preheated raw material, the combustion-supporting air or the gas fuel enters the kiln or the combustion chamber, and part of high-temperature flue gas exhausted from the combustion chamber can be extracted to be mixed with the tail gas of. Wherein,
(1) the flue gas in the combustion chamber after heat exchange and temperature reduction through the gas-water heat exchanger or the raw material preheater and the gas heat exchanger enters the next working procedure for continuous utilization or is evacuated after dust collection.
(2) And the tail gas in the kiln after heat exchange and temperature reduction by the raw material preheater and the gas heat exchanger enters the next working procedure for continuous utilization or is emptied after dust collection. The raw meal after heat exchange and temperature rise of the raw meal preheater is sent to other preheating systems to be continuously preheated or directly enters the kiln to be heated.
(3) The fresh air after heat exchange and temperature rise by the gas heat exchanger is sent to other preheating systems to be continuously preheated or directly enters a combustion chamber of an indirect heating type sintering system to be used as combustion-supporting air.
(4) The gas fuel after heat exchange and temperature rise by the gas heat exchanger is sent to other preheating systems to be continuously preheated or directly enters a combustion chamber of the indirect heating type sintering system to be combusted.
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the waste heat utilization device of the indirect heating sintering system of the present embodiment mainly includes: the kiln 11, the combustion chamber 12, the gas-water heat exchanger 13, the raw material preheater 14, the flash evaporator 15, the saturated water circulating pump 16 and the like have the following specific structures:
the combustion chamber 12 is positioned at the outer side of the kiln 11 and is used for indirectly heating materials in the kiln (a rotary kiln or a vertical furnace), and a combustion flue gas outlet is connected to the gas-water heat exchanger 13 through a pipeline; the gas-water heat exchanger 13 is provided with a low-temperature water inlet and a saturated water outlet, the saturated water outlet is connected to the flash evaporator 15 through a pipeline, and the generated saturated steam passes through the saturated steam outlet of the flash evaporator 15 and goes to other processes through a pipeline; the inlet end of the saturated water circulating pump 16 is communicated with a saturated water outlet at the bottom of the flash evaporator 15, and the outlet end of the saturated water circulating pump 16 is communicated with the saturated water inlet end of the gas-water heat exchanger 13, so that the saturated water self-circulation of the flash evaporator 15 is formed, and the waste heat utilization efficiency is improved; the kiln exhaust gas outlet of the kiln 11 is connected to a raw material preheater 14 via a pipeline, and the raw material preheater 14 is provided with a combustion flue gas inlet for heating raw material by the exhaust gas and the combustion flue gas.
The method for utilizing the waste heat of the indirect heating sintering system in the embodiment comprises the following steps:
high-temperature combustion flue gas discharged from the combustion chamber 12 is conveyed to a gas-water heat exchanger 13 through a pipeline, the high-temperature combustion flue gas exchanges heat with low-temperature water in the gas-water heat exchanger, the temperature of the high-temperature combustion flue gas is reduced while saturated water is prepared, the high-temperature combustion flue gas enters the next step of working procedure for continuous utilization or is emptied after dust collection, and the saturated water is conveyed to other working procedures through a pipeline for utilization or is conveyed to a flash evaporator 15 through a pipeline to prepare saturated steam which is conveyed to other working; meanwhile, the combustion flue gas can be sent to the raw material preheater 14 through a branch pipeline, and exchanges heat with the raw material in the raw material preheater, so that the temperature of the raw material is reduced while the temperature of the raw material is raised, and the raw material enters the next working procedure for continuous utilization or is emptied after dust collection; the high-temperature kiln tail gas discharged from the kiln 11 is sent to a raw material preheater 14 through a pipeline, and exchanges heat with raw materials in the raw material preheater, so that the temperature of the raw materials is reduced while being increased, and the raw materials are continuously utilized in the next working procedure or are emptied after dust collection; the heated raw meal is then fed into the kiln 11 for heating by means of chutes, chutes or feeding systems. In the embodiment, the temperature of high-temperature flue gas discharged from a combustion chamber is 400-1200 ℃, the temperature of tail gas discharged from the interior of a kiln is 120-1200 ℃, low-temperature water is heated by a gas-water heat exchanger to generate 0.1-8.6 MPa saturated water or saturated steam, and the low-temperature water is sent to other heat exchange systems to be continuously heated or sent to other process flows for utilization.
Example 2:
as shown in fig. 2, the waste heat utilization device of the indirect heating sintering system of the present embodiment mainly includes a first-stage kiln 21, a second-stage kiln 22, a first-stage combustion chamber 23, a second-stage combustion chamber 24, a gas-water heat exchanger 25, a raw material preheater 26, a gas heat exchanger 27 (air or gas), a flash evaporator 28, a saturated water circulating pump 29, and the like, and has the following specific structure:
the first-stage combustion chamber 23 and the second-stage combustion chamber 24 are respectively positioned at the outer sides of the first-stage kiln 21 and the second-stage kiln 22 and are used for indirectly heating materials in the kilns (the first-stage kiln 21 and the second-stage kiln 22), combustion flue gas (flue gas of the first-stage combustion chamber and flue gas of the second-stage combustion chamber) is respectively connected to a gas-water heat exchanger 25 through pipelines, and meanwhile, the gas-water heat exchanger 25 is divided into a branch pipeline which is connected to a gas heat exchanger 27; a saturated water outlet heated by the gas-water heat exchanger 25 is connected to the flash evaporator 28 through a pipeline, and the generated saturated steam passes through a saturated steam outlet of the flash evaporator 28 and is sent to other processes through a pipeline; the inlet end of the saturated water circulating pump 29 is communicated with a saturated water outlet at the bottom of the flash evaporator 28, and the outlet end of the saturated water circulating pump 29 is communicated with the saturated water inlet end of the gas-water heat exchanger 25, so that the saturated water self-circulation of the flash evaporator 28 is formed, and the waste heat utilization efficiency is improved;
a first-stage kiln tail gas (first-stage tail gas) outlet of the first-stage kiln 21 is connected to a raw material preheater 26 through a pipeline to heat raw materials; the second stage kiln tail gas (second stage tail gas) outlet of the second stage kiln 22 is connected to a gas heat exchanger 27 through a pipeline, and the gas heat exchanger 27 is provided with a combustion flue gas inlet, and the tail gas and the combustion flue gas are used as combustion-supporting air (or fuel gas) for heating.
The method for utilizing the waste heat of the indirect heating sintering system in the embodiment comprises the following steps:
high-temperature flue gas discharged from the first-stage combustion chamber 23 and the second-stage combustion chamber 24 is conveyed to a gas-water heat exchanger 25 through pipelines, and exchanges heat with low-temperature water to prepare saturated water, and simultaneously reduces the temperature of the flue gas, the flue gas is continuously utilized in the next step or emptied after dust collection, and the saturated water is conveyed to other steps for utilization through pipelines or conveyed to a flash evaporator 28 through pipelines to prepare saturated steam which is conveyed to other steps for utilization; meanwhile, the combustion flue gas can be sent to the gas heat exchanger 27 through a branch pipeline, and exchanges heat with combustion air or fuel gas in the gas heat exchanger, so that the temperature of the combustion air or fuel gas is increased, and the temperature of the combustion air or fuel gas is reduced, and the combustion air or fuel gas enters the next working procedure for continuous utilization or is emptied after dust collection; the tail gas of the first section of the kiln 21 is sent to a raw material preheater 26 through a pipeline, and exchanges heat with raw materials in the raw material preheater to raise the temperature of the raw materials and reduce the temperature of the raw materials, and the raw materials are continuously utilized in the next working procedure or are emptied after dust collection; the heated raw materials are sent into the kiln 21 through a chute, a chute or a feeding system for heating; the tail gas of the second-stage kiln, which is discharged from the second-stage kiln 22, is sent to a gas heat exchanger 27 through a pipeline, and exchanges heat with combustion air or fuel gas therein, so that the temperature of the combustion air or fuel gas is increased, and the temperature of the combustion air or fuel gas is reduced, and the tail gas enters the next working procedure for continuous utilization or is emptied after dust collection; the heated combustion air or gas is sent to the first-stage combustion chamber 23 and the second-stage combustion chamber 24 through pipelines for combustion. In the embodiment, the temperature of high-temperature flue gas discharged from a combustion chamber is 400-1200 ℃, the temperature of tail gas discharged from the interior of a kiln is 120-1200 ℃, low-temperature water is heated by a gas-water heat exchanger to generate 0.1-8.6 MPa saturated water or saturated steam, and the low-temperature water is sent to other heat exchange systems to be continuously heated or sent to other process flows for utilization.
The embodiment result shows that the invention can effectively recover partial heat in the kiln tail gas and the combustion flue gas, generate saturated water or saturated steam for the whole plant to use, reduce the energy consumption of the whole plant, save the production cost, and simultaneously can also reduce the self temperature of the smoke (tail) to be beneficial to further treatment or dust collection emission.
Claims (14)
1. A waste heat utilization method of an indirect heating type sintering system is characterized by comprising the following steps:
(1) high-temperature flue gas discharged from a kiln combustion chamber is conveyed to a gas-water heat exchanger through a pipeline, the high-temperature flue gas exchanges heat with low-temperature water in the gas-water heat exchanger, the temperature of the high-temperature flue gas is reduced while the water is heated to a saturated state of 0.1-8.6 MPa, the high-temperature flue gas enters the next step for continuous utilization or is emptied after dust collection, and saturated water is conveyed to other process flows for utilization or enters a flash evaporator through a pipeline and a saturated water circulating pump thereof to generate 0.1-8.6 MPa saturated steam, and is conveyed to other process flows for utilization;
(2) the tail gas discharged from the kiln is sent to a raw material preheater and a gas heat exchanger through pipelines, and exchanges heat with raw material before entering the kiln or combustion-supporting air before entering a combustion chamber or gas fuel before entering the combustion chamber, so that the raw material or the combustion-supporting air or the gas fuel is heated, the temperature of the tail gas is reduced at the same time, the tail gas enters the next process for continuous utilization or is exhausted after dust collection, the preheated raw material or the combustion-supporting air or the gas fuel enters the kiln or the combustion chamber, and part of high-temperature flue gas discharged from the combustion chamber is pumped out to be mixed with the tail gas of the kiln to preheat the raw material or the combustion-supporting air or the gas fuel together according to the;
the waste heat utilization device of the indirect heating type sintering system special for the method comprises the following components: combustion chamber, gas-water heat exchanger, flash vessel, saturated water circulating pump, raw material preheater, the concrete structure is as follows:
a flue gas outlet pipeline of the combustion chamber is connected to an air inlet of the air-water heat exchanger, a branch pipe is arranged on a flue gas connecting pipeline of the combustion chamber and is connected with the raw material preheater, a saturated water outlet pipeline of the air-water heat exchanger is connected to the flash evaporator, the flash evaporator is connected with the saturated water circulating pump through a pipeline, the inlet end of the saturated water circulating pump is communicated with a saturated water outlet at the bottom of the flash evaporator, and the outlet end of the saturated water circulating pump is communicated with the saturated water inlet end of the air-water heat exchanger to form; the kiln tail gas outlet pipeline is connected to a raw material preheater, a flue gas inlet communicated with the combustion chamber is arranged on the raw material preheater, and a raw material outlet of the raw material preheater is connected to a kiln feed inlet;
the device also comprises a gas heat exchanger, wherein a branch pipe is arranged on a flue gas connecting pipeline of the combustion chamber and is connected with the gas heat exchanger; the kiln tail gas outlet pipeline is connected to a gas heat exchanger, a flue gas inlet communicated with the combustion chamber is formed in the gas heat exchanger, and a hot air or fuel gas outlet of the gas heat exchanger is connected to a combustion air or fuel gas inlet of the combustion chamber.
2. The method for utilizing the waste heat of an indirect heating sintering system according to claim 1, wherein the temperature of high-temperature flue gas discharged from the combustion chamber is 400 ℃ to 1200 ℃, the temperature of tail gas discharged from the interior of the kiln is 120 ℃ to 1200 ℃, and the low-temperature water is heated by a gas-water heat exchanger to generate 0.1MPa to 8.6MPa of saturated water or saturated steam.
3. The method for utilizing the waste heat of the indirect heating type sintering system as claimed in claim 1, wherein the fresh air heated by the heat exchange of the gas heat exchanger is sent to other preheating systems for further preheating or directly enters a combustion chamber of the indirect heating type sintering system to be used as combustion air.
4. The method for utilizing the waste heat of the indirect heating type sintering system as claimed in claim 1, wherein the gas fuel heated by heat exchange of the gas heat exchanger is sent to other preheating system for further preheating or directly enters into a combustion chamber of the indirect heating type sintering system for combustion.
5. The method for utilizing the waste heat of the indirect heating type sintering system as claimed in claim 1, wherein the saturated water or the saturated steam with the pressure of 0.1MPa to 8.6MPa generated by the heat exchange of the gas-water heat exchanger is sent to other heat exchange systems to be continuously heated or sent to other process flows for utilization.
6. The method for utilizing the waste heat of the indirect heating type sintering system as claimed in claim 1, wherein the raw meal heated by the heat exchange of the raw meal preheater is further preheated by other preheating systems or directly enters the kiln for heating.
7. The method of utilizing the residual heat of the indirect heating sintering system according to claim 1, wherein the sintering system is a sintering apparatus for indirectly heating the kiln through a combustion chamber.
8. The method of utilizing the residual heat of an indirect heating sintering system according to claim 1, wherein the kiln to be heated in the sintering system is a rotary kiln or a shaft furnace.
9. The method for utilizing the residual heat of an indirect heating sintering system according to claim 1, wherein the sintering system is a single-stage kiln system or a kiln system with more than two stages.
10. The method of utilizing the residual heat of an indirect heating sintering system according to claim 1, wherein the number of the flue gas outlets of the combustion chamber is one or more than two.
11. The method for utilizing the waste heat of an indirect heating sintering system according to claim 1, wherein the gas-water heat exchanger is a one-stage heat exchanger or a two-stage or more heat exchanger.
12. The method of utilizing the waste heat of an indirect heating sintering system as claimed in claim 1, wherein the raw material outlet of the raw material preheater is connected to the kiln inlet of the indirect heating sintering system through a feeding system.
13. The method of utilizing waste heat of an indirect heating sintering system according to claim 1, wherein the gas heat exchanger is a one-stage heat exchanger or a two-stage or more heat exchanger.
14. The method for utilizing the waste heat of an indirect heating sintering system according to claim 1, wherein the gas heat exchanger is a shell-and-tube heat exchanger or a hot-tube heat exchanger.
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| CN110747354A (en) * | 2019-11-07 | 2020-02-04 | 江西飞宇新能源科技有限公司 | Lithium extraction system and method for lithium china stone, lithium-containing mother liquor and filling agent |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395146Y (en) * | 1999-09-20 | 2000-09-06 | 李爱民 | Rotary kiln-fluidised bed combined solid waste pyrolysis apparatus |
| JP2008128492A (en) * | 2006-11-16 | 2008-06-05 | Takasago Ind Co Ltd | External heating-type rotary kiln and screw feeder |
| CN201621949U (en) * | 2010-04-13 | 2010-11-03 | 伍震洲 | Externally-heated coal reducing rotary kiln |
| CN202284896U (en) * | 2011-11-01 | 2012-06-27 | 李德旗 | Externally-heating rotary furnace of three-channel retracing continuous production |
| CN103771465A (en) * | 2012-10-18 | 2014-05-07 | 沈阳铝镁设计研究院有限公司 | Fly ash clinker sintering technology |
-
2014
- 2014-09-18 CN CN201410479807.8A patent/CN105486096B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395146Y (en) * | 1999-09-20 | 2000-09-06 | 李爱民 | Rotary kiln-fluidised bed combined solid waste pyrolysis apparatus |
| JP2008128492A (en) * | 2006-11-16 | 2008-06-05 | Takasago Ind Co Ltd | External heating-type rotary kiln and screw feeder |
| CN201621949U (en) * | 2010-04-13 | 2010-11-03 | 伍震洲 | Externally-heated coal reducing rotary kiln |
| CN202284896U (en) * | 2011-11-01 | 2012-06-27 | 李德旗 | Externally-heating rotary furnace of three-channel retracing continuous production |
| CN103771465A (en) * | 2012-10-18 | 2014-05-07 | 沈阳铝镁设计研究院有限公司 | Fly ash clinker sintering technology |
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