CN111117671A - Low-rank coal segmented upgrading and hot flue gas gradient utilization system and utilization method thereof - Google Patents
Low-rank coal segmented upgrading and hot flue gas gradient utilization system and utilization method thereof Download PDFInfo
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- CN111117671A CN111117671A CN202010044840.3A CN202010044840A CN111117671A CN 111117671 A CN111117671 A CN 111117671A CN 202010044840 A CN202010044840 A CN 202010044840A CN 111117671 A CN111117671 A CN 111117671A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/02—Multi-step carbonising or coking processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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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
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- 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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Abstract
The invention relates to a low-rank coal segmented upgrading and hot flue gas gradient utilization system and a utilization method thereof, belonging to the technical field of low-rank pulverized coal pyrolysis, and particularly comprising a coal dropping channel connected with an outlet of a blanking cover of a rotary kiln, an upgrading pyrolysis section arranged at the upper part of the coal dropping channel, and a multi-stage cooler arranged at the lower part of the coal dropping channel, wherein the upgrading pyrolysis section comprises a plurality of heat exchange tubes arranged in the coal dropping channel, a hot air outlet of a hot air furnace is connected with a heat exchange medium inlet of the upgrading pyrolysis section, a heat exchange medium outlet of the upgrading pyrolysis section is connected with an inlet of an air inlet cover of the rotary kiln, an outlet of an air outlet cover of the rotary kiln is connected with a desulfurization and denitrification system through a fan, a first temperature sensor, a flowmeter and a butterfly valve are further arranged on a pipeline between the outlet of the air outlet cover of the rotary kiln and the fan, the invention has reasonable structural design, can fully utilize the heat of the flue gas and reduce the energy consumption.
Description
Technical Field
The invention relates to a low-rank coal segmented upgrading and hot flue gas gradient utilization system and a utilization method thereof, and belongs to the technical field of low-rank pulverized coal pyrolysis.
Background
Coal is the main energy source in a period of our country. In 2006, the resource amount of Chinese coal is 10345 hundred million tons, the remaining exploratory recoverable reserves account for about 13 percent of the world, and the third world, wherein the reserves of low-rank coal account for about 57 percent. In recent years, more than 30 hundred million tons of coal are adopted in China every year, and more than half of the coal is low-rank coal. Meanwhile, the coal and carbon utilization form in China is relatively simple, most of the coal and carbon utilization forms are used for combustion and power generation, oil and gas resources in coal are combusted in a simple form, the principle of high quality, high use and low use is not met, and the environmental problem is aggravated. By conservative measurement, about more than 1 hundred million tons of oil and gas resources are wasted every year. Therefore, the development of clean and efficient decomposition and quality-separation utilization technology for coal, especially low-rank coal, is urgently needed.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the low-rank coal segmented pyrolysis hot flue gas gradient utilization system and the utilization method thereof, wherein the system is reasonable in structural design, can fully utilize the heat of flue gas, and can reduce the energy consumption.
In order to achieve the purpose, the technical scheme adopted by the invention is that the low-rank coal segmented upgrading and hot flue gas gradient utilization system comprises a rotary kiln and a hot blast stove, wherein an outlet of a discharging cover of the rotary kiln is connected with a vertical furnace, the vertical furnace mainly comprises a pyrolysis upgrading section and a cooling section, the pyrolysis upgrading section is arranged at the upper part of the vertical furnace, the cooling section is arranged at the lower part of the vertical furnace, the cooling section mainly comprises a plurality of coolers, the pyrolysis upgrading section comprises a plurality of heat exchange tubes arranged in the vertical furnace, a hot blast outlet of the hot blast stove is connected with a heat exchange medium inlet of the pyrolysis upgrading section, a heat exchange medium outlet of the pyrolysis upgrading section is connected with an inlet of an air inlet cover of the rotary kiln, an outlet of an air outlet cover of the rotary kiln is connected with a desulfurization and denitrification system through a fan, and a first temperature sensor is further arranged on a pipeline between the outlet of the air outlet, The first temperature sensor is in linkage control with the fan, and the upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section enters the cooling section to exchange heat with desalted water.
The low-rank coal is dried by a rotary kiln, subjected to first-stage pyrolysis quality improvement, enters the upper part of the vertical furnace through a discharging cover outlet to perform second-stage pyrolysis quality improvement, and then enters the lower part of the vertical furnace to perform cooling. And in the cooling and temperature reduction section, desalted water is used for cooling the upgraded coal subjected to secondary pyrolysis and generating steam as a byproduct. The hot flue gas gradient utilization means that hot air enters the vertical furnace upper part pyrolysis upgrading section heat exchange tube from the outlet of the hot blast stove to provide heat for second-stage pyrolysis for primary cooling, then enters the rotary kiln air inlet cover from the outlet of the vertical furnace upper part pyrolysis upgrading section heat exchange tube to provide heat for first-stage pyrolysis for secondary cooling, then provides heat for drying for terminal cooling, and finally is discharged from the air outlet cover of the rotary kiln and connected with a desulfurization and denitrification system through a fan.
Preferably, a hot air outlet of the air furnace is connected with a hot air adjusting pipeline, a first control valve is arranged on the hot air adjusting pipeline, a second temperature sensor is arranged on a pipeline between the hot air outlet of the hot air furnace and a heat exchange medium inlet of the pyrolysis upgrading section, and the second temperature sensor and the first control valve are controlled in a linkage mode.
Preferably, an air outlet of the fan is connected with a back-off flue gas pipeline, the back-off flue gas pipeline is connected with an air box of the hot blast stove, a second regulating valve is installed on the back-off flue gas pipeline, a third temperature sensor is installed on a pipeline between a heat exchange medium outlet of the pyrolysis upgrading section and an inlet of an air inlet cover of the rotary kiln, and the third temperature sensor and the second regulating valve are in linkage control.
Preferably, the steam generated after the heat exchange of the cooling section is connected with a steam drum through a pipeline and is used for generating byproduct steam.
A low-rank coal segmented pyrolysis hot flue gas gradient utilization method is carried out according to the following steps that raw material coal is dried in a rotary kiln, is pyrolyzed for the first section, oil gas resources in the low-rank coal are extracted, the volatile content of upgraded coal at the outlet of the rotary kiln is 14% -18%, the temperature is 450 ℃ -550 ℃, the upgraded coal enters a pyrolysis upgrading section of a vertical furnace to be pyrolyzed for the second section, residual pyrolysis gas is extracted, the volatile content of the upgraded coal at the outlet of the vertical furnace is 4% -10%, the temperature is 600 ℃ -800 ℃, the upgraded coal enters a cooling section of the vertical furnace to be subjected to indirect heat exchange with desalted water, steam with different grades is generated according to the needs of a whole plant, and the temperature of the upgraded coal at the cooling outlet is 40 ℃ -160;
hot air generated by the hot blast stove is controlled to have outlet flue gas temperature of 950-1200 ℃ by adjusting back part of flue gas or controlling steam generation grade and steam generation quantity, after heat exchange with upgraded coal in a pyrolysis upgrading section, the outlet flue gas temperature is controlled to be kept at 850-1050 ℃ and enters the rotary kiln to provide heat for drying and pyrolysis of the rotary kiln, the outlet flue gas temperature after drying and pyrolysis of the rotary kiln is 150-300 ℃, the outlet flue gas part is adjusted back to the hot blast stove hot flue gas temperature, the rest part is discharged out of the system after denitration and desulfurization, or part of the outlet flue gas is adjusted back to the hot blast stove hot flue gas temperature after denitration and desulfurization, and the rest part of.
Compared with the prior art, the invention has the following technical effects.
1. Heating the low-rank coal by stages, dehydrating at low temperature, pyrolyzing at the first stage, pyrolyzing at the second stage, cooling to produce steam, heating by stages, and upgrading by stages. Firstly, the operation temperature of a first-stage pyrolysis rotary kiln is reduced, and the long-period operation of the rotary kiln is facilitated; secondly, the coke precipitation blockage caused by the pure cooling of the vertical furnace is reduced, and the equipment operation is hindered; thirdly, the yield maximization and the quality optimization of the low-rank coal pyrolysis tar are realized.
2. The hot flue gas is cooled in a segmented manner, and is subjected to countercurrent heat exchange with low-rank coal and cascade utilization: 1) the investment increase caused by two sets of hot air systems and the flue gas treatment difficulty caused by different pressure drops of two outlet flue gases in operation are avoided; 2) the problem of one set of hot air system, the flue gas outlet advances two pyrolysis device air volume distribution control degree of difficulty respectively is avoided. 3) Through relevant process control, the whole hot air system is connected in series and utilized in a gradient manner, so that the production control is facilitated, the effective utilization of heat is facilitated, and the environmental protection requirement is met.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in figure 1, the low-rank coal segmented upgrading and hot flue gas gradient utilization system comprises a rotary kiln 1 and a hot blast stove 2, wherein an outlet of a discharging cover of the rotary kiln 1 is connected with a vertical furnace 3, the vertical furnace 3 mainly comprises a pyrolysis upgrading section 4 and a cooling section 5, the pyrolysis upgrading section 4 is arranged at the upper part of the vertical furnace 3, the cooling section 5 is arranged at the lower part of the vertical furnace 3, the cooling section 5 mainly comprises a plurality of coolers, the pyrolysis upgrading section 4 comprises a plurality of heat exchange tubes arranged in the vertical furnace, a hot air outlet of the hot blast stove 2 is connected with a heat exchange medium inlet of the pyrolysis upgrading section 4, a heat exchange medium outlet of the pyrolysis upgrading section 4 is connected with an inlet of an air inlet cover of the rotary kiln 1, an outlet of an air outlet cover of the rotary kiln 1 is connected with a desulfurization and denitrification system through a fan 6, and a first temperature sensor 7, a second temperature sensor and a second, A flow meter 8, a butterfly valve 9 and a first temperature sensor 7 are controlled by a fan 6 in a linkage manner, and the upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section 4 enters the cooling section 5 to exchange heat with desalted water.
The air outlet of the fan 6 is connected with a back-off flue gas pipeline 14, the back-off flue gas pipeline 14 is connected with an air box of the hot blast stove 2, a second adjusting valve 15 is installed on the back-off flue gas pipeline 14, a third temperature sensor 16 is installed on a pipeline between a heat exchange medium outlet of the pyrolysis upgrading section 4 and an inlet of an air inlet cover of the rotary kiln, and the third temperature sensor 16 and the second adjusting valve 15 are in linkage control. The upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section 4 enters the cooling section 5 to exchange heat with desalted water, and steam generated by heat exchange can be connected with the steam drum 10 through a pipeline to be used for generating byproduct steam.
In the embodiment, the hot blast stove is used for adjusting back the low-temperature flue gas after partial pyrolysis through a flue gas adjusting back pipeline, and the temperature of the hot blast produced by the hot blast stove is adjusted to control the temperature, so that the outlet temperature of the hot blast stove is 950-1200 ℃, then the outlet temperature is 850-1050 ℃ after heat exchange in the pyrolysis quality-improving section 4, the drying and pyrolysis requirements of the rotary kiln are met, then the temperature of the positioned flue gas after drying and pyrolysis of the rotary kiln can be kept at 150-300 ℃, and the use requirements of the existing desulfurization and denitrification system are met. The third temperature sensor 16 is used for detecting the temperature of the outlet flue gas of the pyrolysis upgrading section 4, and adjusting the opening of the second adjusting valve 15 according to the outlet temperature, so as to adjust the amount of the flue gas.
Example two
A hot air outlet of the hot air furnace 2 is connected with a hot air adjusting pipeline 11, a first control valve 12 is arranged on the hot air adjusting pipeline 11, the control of the temperature of hot flue gas is realized by controlling the steam level and the steam generation amount generated by a boiler, a second temperature sensor 13 is arranged on a pipeline between the hot air outlet of the hot air furnace 2 and a heat exchange medium inlet of the pyrolysis upgrading section 4, and the second temperature sensor 13 and the first control valve 12 are controlled in a linkage mode. The rest is the same as the first embodiment.
In the embodiment, the hot air regulating pipeline 11 is controlled to control the temperature of the hot air entering the pyrolysis upgrading section 4, the second temperature sensor 13 directly detects the temperature of the outlet of the hot air furnace, and then the opening degree of the first control valve 12 is regulated according to the temperature.
When the coal gasification furnace is used specifically, raw material coal is dried and pyrolyzed for the first time in a rotary kiln, oil gas resources in low-rank coal are extracted, upgraded coal volatile matter at the outlet of the rotary kiln is 14% -18% and the temperature is 450 ℃ -550 ℃, then the coal gasification furnace enters a pyrolysis upgrading section of a vertical furnace for pyrolysis for the second time, residual pyrolysis gas is extracted, upgraded coal volatile matter at the outlet of the vertical furnace is 4% -10%, the temperature is 600 ℃ -800 ℃, the coal gasification furnace enters a cooling section of the vertical furnace, indirect heat exchange is carried out between the coal gasification furnace and desalted water, steam with different grades is generated according to the needs of the whole plant, and the temperature of the upgraded coal cooling outlet is 40 ℃ -160 ℃;
hot air generated by the hot blast stove is controlled to have outlet flue gas temperature of 950-1200 ℃ by adjusting back part of flue gas or controlling steam generation grade and steam generation quantity, after heat exchange with upgraded coal in a pyrolysis upgrading section, the outlet flue gas temperature is controlled to be kept at 850-1050 ℃ and enters the rotary kiln to provide heat for drying and pyrolysis of the rotary kiln, the outlet flue gas temperature after drying and pyrolysis of the rotary kiln is 150-300 ℃, the outlet flue gas part is adjusted back to the hot blast stove hot flue gas temperature, the rest part is discharged out of the system after denitration and desulfurization, or part of the outlet flue gas is adjusted back to the hot blast stove hot flue gas temperature after denitration and desulfurization, and the rest part of.
The present invention is not limited to the above preferred embodiments, but rather, any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a low order coal segmentation is upgraded and hot flue gas cascade utilization system, includes rotary kiln and hot-blast furnace, its characterized in that: the outlet of the discharging cover of the rotary kiln is connected with a vertical furnace which mainly comprises a pyrolysis quality-improving section and a cooling section, the pyrolysis quality-improving section comprises a plurality of heat exchange tubes arranged in the vertical furnace, the pyrolysis quality-improving section is arranged at the upper part of the vertical furnace, the cooling section is arranged at the lower part of the vertical furnace, and the cooling section is mainly composed of a plurality of coolers, a hot air outlet of the hot blast stove is connected with a heat exchange medium inlet of the pyrolysis upgrading section, the outlet of the heat exchange medium of the pyrolysis upgrading section is connected with the inlet of an air inlet hood of the rotary kiln, the outlet of an air outlet hood of the rotary kiln is connected with a desulfurization and denitrification system through a fan, a first temperature sensor, a flowmeter and a butterfly valve are also arranged on a pipeline between the outlet of the air outlet cover of the rotary kiln and the fan, and the first temperature sensor is controlled by the fan in a linkage manner, and the upgraded coal subjected to secondary pyrolysis in the pyrolysis upgrading section enters the cooling section to exchange heat with desalted water.
2. The low-rank coal segmented upgrading and hot flue gas gradient utilization system according to claim 1, characterized in that: the hot air outlet of the hot air furnace is connected with a hot air adjusting pipeline, a first control valve is arranged on the hot air adjusting pipeline, a second temperature sensor is installed on a pipeline between the hot air outlet of the hot air furnace and a heat exchange medium inlet of the pyrolysis upgrading section, and the second temperature sensor and the first control valve are controlled in a linkage mode.
3. The low-rank coal segmented upgrading and hot flue gas gradient utilization system according to claim 1, characterized in that: the air outlet of the fan is connected with a back-off flue gas pipeline, the back-off flue gas pipeline is connected with an air box of the hot blast stove, a second adjusting valve is installed on the back-off flue gas pipeline, a third temperature sensor is installed on a pipeline between a heat exchange medium outlet of the pyrolysis upgrading section and an inlet of an air inlet cover of the rotary kiln, and the third temperature sensor and the second adjusting valve are in linkage control.
4. The low-rank coal segmented upgrading and hot flue gas gradient utilization system according to claim 1, characterized in that: and the steam generated after the heat exchange of the cooling section is connected with a steam drum through a pipeline and is used for generating byproduct steam.
5. The method for utilizing the low-rank coal subsection quality improvement and hot flue gas cascade utilization system of claim 1 is characterized in that: drying and first-stage pyrolysis are carried out on raw material coal in a rotary kiln, oil gas resources in low-rank coal are extracted, the volatile component of upgraded coal at the outlet of the rotary kiln is 14% -18% and the temperature is 450 ℃ -550 ℃, the raw material coal enters a pyrolysis upgrading section of a vertical furnace to carry out second-stage pyrolysis, the residual pyrolysis gas is extracted, the volatile component of upgraded coal at the outlet of the vertical furnace is 4% -10%, the temperature is 600 ℃ -800 ℃, the upgraded coal enters a cooling section of the vertical furnace to indirectly exchange heat with desalted water, steam with different grades is generated according to the requirement of the whole plant, and the temperature of the cooling outlet of the upgraded coal is 40 ℃ -160 ℃;
hot air generated by the hot blast stove is controlled to have outlet flue gas temperature of 950-1200 ℃ by adjusting back part of flue gas or controlling steam generation grade and steam generation quantity, after heat exchange with upgraded coal in a pyrolysis upgrading section, the outlet flue gas temperature is controlled to be kept at 850-1050 ℃ and enters the rotary kiln to provide heat for drying and pyrolysis of the rotary kiln, the outlet flue gas temperature after drying and pyrolysis of the rotary kiln is 150-300 ℃, the outlet flue gas part is adjusted back to the hot blast stove hot flue gas temperature, the rest part is discharged out of the system after denitration and desulfurization, or part of the outlet flue gas is adjusted back to the hot blast stove hot flue gas temperature after denitration and desulfurization, and the rest part of.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964256A (en) * | 2020-08-27 | 2020-11-20 | 山东祥桓环境科技有限公司 | Low-rank fuel continuous combustion regenerative hot air device and process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964256A (en) * | 2020-08-27 | 2020-11-20 | 山东祥桓环境科技有限公司 | Low-rank fuel continuous combustion regenerative hot air device and process |
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Effective date of registration: 20220330 Address after: 474550 no.110-21, Baiyu Road, Chengguan Town, Xixia County, Nanyang City, Henan Province Applicant after: Bai Taikuan Address before: 030006 2101, block a, Gaoxin Guozhi building, No.3, Dongyi second lane, Taiyuan Xuefu Park, Xiaodian District, Taiyuan City, Shanxi Province Applicant before: Shanxi Zhirong New Energy Technology Co.,Ltd. |