CN201670735U - Efficient heat-recovering decarburization roasting boiler with low calorific value - Google Patents

Efficient heat-recovering decarburization roasting boiler with low calorific value Download PDF

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Publication number
CN201670735U
CN201670735U CN2010200320967U CN201020032096U CN201670735U CN 201670735 U CN201670735 U CN 201670735U CN 2010200320967 U CN2010200320967 U CN 2010200320967U CN 201020032096 U CN201020032096 U CN 201020032096U CN 201670735 U CN201670735 U CN 201670735U
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China
Prior art keywords
slag
air
slag cooler
boiler
hearth
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Expired - Lifetime
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CN2010200320967U
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Chinese (zh)
Inventor
陈彩东
肖宏
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HUNAN DONGYUAN ENERGY ENVIRONMENT PROTECTION EQUIPMENT CO Ltd
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HUNAN DONGYUAN ENERGY ENVIRONMENT PROTECTION EQUIPMENT CO Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The utility model relates to an efficient heat-recovering decarburization roasting boiler with a low calorific value, which comprises a hearth, a hearth water-cooling wall and a partition wall pipe. The lower part of the hearth is provided with an embedded pipe, an air distribution plate and an air chamber, the upper part of the hearth is provided with a fume outlet, a high-temperature separator, a superheater, a convection pipe bundle, an economizer, an air preheater, a dust collector, a draft fan and a chimney connected in sequence; and the upper end and the lower end of the convection pipe bundle are respectively provided with an upper drum and a lower drum; the lower part of the hearth is also provided with a slag cooler, a hot slag outlet on the bottom end of the hearth is communicated with the slag cooler through a hot slag pipe, the bottom of the slag cooler is connected with a cooling air inlet, a hot air outlet on the upper end of the slag cooler is communicated with the hearth and a fuel preheater through a return system, and the heating surface of the embedded pipe of the slag cooler is communicated with a water circulating system of the boiler. The utility model makes full use of the heat of the slag, saves the energy and avoids the environmental pollution. The heat recovery rate reaches 80 percent. Therefore, the utility model greatly improves the thermal efficiency of the boiler. Moreover, the utility model solves the problem that the stone coal with the heat productivity below 850 kilocalories can not burn stably in the existing circulating fluidized-bed boiler.

Description

Efficient recovery of heat low heat value decarburization roast boiler
Technical field:
The utility model relates to boiler and technical field of smelting, specifically is meant a kind of efficient recovery of heat low heat value decarburization roast boiler.
Background technology:
Contain the scherbinaite coal and when refining Vanadium Pentoxide in FLAKES, need carry out decarburization oxidation roast,,, generally carry out the secondary roast in the production for guaranteeing the abundant oxidation of vanadium for the bone coal of calorific value more than 2.93MJ/kg (700 kilocalorie).Roast of old-fashioned production technique adopts flat kiln or burnt in a heap in the open, and production efficiency is low, and Dark smoke billows in district burnt in a heap, not only waste energy greatly, and contaminate environment.Roast of existing many vanadium factories adopts the circular fluid bed decarburization, but the following bone coal of thermal value 850 kilocalories can't stable burning in existing circular fluid bed.And, do not consider that Integrated Energy makes full use of, boiler efficiency is low.
Summary of the invention:
Technical problem to be solved in the utility model is: at the problem of above-mentioned prior art existence, and provide a kind of efficient recovery of heat low heat value decarburization roast boiler, make full use of the heat that the low heat value bone coal produces in carbon rejection process, comprehensive utilization, save energy is avoided environmental pollution, and heat recovery rate reaches 80%, greatly improve boiler thermal output, solved the problem that thermal value 850 kilocalories following bone coals can't stable burning in existing circular fluid bed.
The technical solution adopted in the utility model is: this efficient recovery of heat low heat value decarburization roast boiler, comprise burner hearth, furnace wall cooling, partition wall pipe, upper furnace is a freeboard of fluidized bed, lower furnace portion is an emulsion zone, and pipe laying and air distribution plate be installed, under the air distribution plate is air compartment, upper furnace exhanst gas outlet, high-temperature separator, superheater, convection bank, economizer, air preheater, fly-ash separator, induced draft fan, chimney connect successively, constitute the flue gas flow passage, the convection bank upper and lower end is installed drum and lower drum respectively; Slag cooler also is installed below burner hearth, slag cooler is made up of material feeder, moving-bed, pipe laying heating surface, the warm sludge outlet of burner hearth bottom connects by the material feeder warm sludge import of hot slag tube and slag cooler, be connected and installed with cooling air compartment and cooling air inlet under the slag cooler, the hot-blast outlet of slag cooler upper end connects burner hearth and fuel preheater by revert system, the pipe laying heating surface and the boiler water circulation system of slag cooler connect, and the slag cooler bottom also has cold slag outlet.
In the technique scheme, air preheater includes high temperature section air preheater and low-temperature zone air preheater.
System flow:
1, raw coal, freezing air enters the burner hearth burning through being preheating to certain temperature.
Raw coal--coal preheater--burner hearth (fluidized-bed)
Freezing air--air preheater----air compartment----burner hearth (fluidized-bed)
Freezing air--air, water combined slag-cooling device----secondary air system mouthful----burner hearth (fluidized-bed)
2, flue gas flow
Flue gas enters high temperature from burner hearth and separates----superheater----convection bank----economizer----air preheater----coal preheater----fly-ash separator----induced draft fan----chimney.
3, carbonated drink flow process
----------------------------superheater----uses hot equipment to upper drum to water-cooling system (pipe laying, water wall, partition wall pipe, slag cooler pipe laying) to lower drum to upper drum to economizer to soft water in convection bank.
4, slag flow process
Warm sludge--air, water combined slag-cooling device-cold slag
The utility model combustion system adopts fluidized-bed.Fuel (bone coal) net calorific value is 2.93~4.2MJ/kg.Concrete technical essential is as follows:
1, fluidized-bed combustion.Bottom dense adopts low wind speed.The richness that helps particle is long-pending, and thermal capacity is big.At the suitably a small amount of thermal discharge of arranging heating surface (pipe laying) with adjustment balance emulsion zone of emulsion zone.
2, high wind-warm syndrome.One time wind accounts for 80% of total blast volume, utilizes the tail air preheater that air themperature is heated to comparatively high temps, is beneficial to that bone coal catches fire in the bed material, and bed temperature is stable easily.Bed temperature in service is in 800 ~ 950 ℃ of scopes.
3, high coal temperature.
4, air, water combined slag-cooling device.
Air, water combined slag-cooling device
Three kinds of modes are adopted in the cooling of tradition fluidisation height of bed temperature slag: one, stack natural air cooled; Two, cold with industrial shrend; Three, adopt a large amount of recirculated waters to cool off with rolling-cylinder type slag-cooler.These three kinds of mode heats have all wasted, and especially for using the ash-rich coal, the heat loss due to sensible heat in slag is up to 13% (ash reaches 80% bone coal).Therefore, how to make full use of physical heat of ash dregs, to improving total system thermo-efficiency, save energy has significance.This type air, water combined slag-cooling device, heat recovery rate is greater than 80%, and energy-saving effect is remarkable.Technical essential is as follows:
1, slag cooler is made up of material feeder, moving-bed, pipe laying heating surface.Utilize air, water heat absorption, the slag temperature is reduced to 100 ℃ from 900 ℃.Heat recovery rate is greater than 80%.
2, cooling air quantity uses as secondary air.The slag cooler operation under positive pressure.Heat is taken back total system.
3, the pipe laying heating surface adopts natural circulation, and system links together with decarburization roast boiler water-cooling.Safe and reliable, need not to consider in addition recirculated water heat exchange cooling.Heat directly transforms generation steam.
4, pneumatic moving-bed (U-shaped valve) is adopted in control to the quantity of slag, and this feed-type uses in the circulating fluidized bed material return system in a large number.Technology maturation is controlled safe and reliable.
Description of drawings:
Fig. 1 is the utility model diagrammatic cross-section
The accompanying drawing mark:
1---burner hearth 2---furnace wall cooling 3---partition wall pipe
4---freeboard of fluidized bed 5---emulsion zone 6---pipe laying 7---air distribution plates
8---air compartment 9---flue gas goes out 10---high-temperature separators
11---superheater 12---convection bank 13---economizers
14---high temperature section air preheater 15---low-temperature zone air preheater
16---upper drum 17---lower drum 18---slag coolers
19---material feeder 20---moving-bed 21---pipe laying heating surfaces
22---warm sludge outlet 23---hot slag tube 24---warm sludge imports
25---cooling air compartment 26---cooling air goes into 27---hot-blast outlets
28---cold slag outlet 29---fuel preheater 30---coal inlets
Embodiment:
Referring to Fig. 1, efficient recovery of heat low heat value decarburization roast boiler of the present utility model, comprise burner hearth 1, furnace wall cooling 2, partition wall pipe 3, upper furnace is a freeboard of fluidized bed 4, lower furnace portion is an emulsion zone 5, and pipe laying 6 and air distribution plate 7 be installed, under the air distribution plate 7 is air compartment 8, upper furnace exhanst gas outlet 9, high-temperature separator 10, superheater 11, convection bank 12, economizer 13, air preheater, fly-ash separator, induced draft fan, chimney connect successively, constitute the flue gas flow passage, the convection bank upper and lower end is installed drum 16 and lower drum 17 respectively; Slag cooler 18 also is installed below burner hearth, slag cooler is made up of material feeder 19, moving-bed 20, pipe laying heating surface, the warm sludge outlet 22 of burner hearth bottom connects by the material feeder warm sludge import 24 of hot slag tube 23 with slag cooler, be connected and installed with cooling air compartment 25 and cooling air inlet 26 under the slag cooler, the hot-blast outlet 27 of slag cooler upper end connects burner hearth and fuel preheater 29 by revert system, the pipe laying heating surface and the boiler water circulation system of slag cooler connect, and the slag cooler bottom also has cold slag outlet 28.Air preheater includes high temperature section air preheater 14 and low-temperature zone air preheater 15.

Claims (2)

1. efficient recovery of heat low heat value decarburization roast boiler, comprise burner hearth, furnace wall cooling, partition wall pipe, upper furnace is a freeboard of fluidized bed, lower furnace portion is an emulsion zone, and pipe laying and air distribution plate are installed, and be air compartment under the air distribution plate, upper furnace exhanst gas outlet, high-temperature separator, superheater, convection bank, economizer, air preheater, fly-ash separator, induced draft fan, chimney connect successively, constitute the flue gas flow passage, the convection bank upper and lower end is installed drum and lower drum respectively; It is characterized in that below burner hearth, also being equipped with slag cooler, slag cooler is made up of material feeder, moving-bed, pipe laying heating surface, the warm sludge outlet of burner hearth bottom connects by the material feeder warm sludge import of hot slag tube and slag cooler, be connected and installed with cooling air compartment and cooling air inlet under the slag cooler, the slag cooler bottom also has cold slag outlet.
2. efficient recovery of heat low heat value decarburization roast boiler according to claim 1, it is characterized in that air preheater includes high temperature section air preheater and low-temperature zone air preheater, the pipe laying heating surface and the boiler water circulation system of slag cooler connect, and the hot-blast outlet of slag cooler upper end connects burner hearth and fuel preheater by revert system.
CN2010200320967U 2010-01-18 2010-01-18 Efficient heat-recovering decarburization roasting boiler with low calorific value Expired - Lifetime CN201670735U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534190A (en) * 2012-01-20 2012-07-04 彭武星 Three-section type heating and roasting method for refining vanadium pentoxide
CN107990549A (en) * 2017-11-17 2018-05-04 芜湖新农夫机械有限公司 It is a kind of to store hot-blast stove from drying
CN109973980A (en) * 2019-04-01 2019-07-05 哈尔滨锅炉厂有限责任公司 50MW grade double flow packet high pressure-temperature pulverized-coal fired boiler

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534190A (en) * 2012-01-20 2012-07-04 彭武星 Three-section type heating and roasting method for refining vanadium pentoxide
CN107990549A (en) * 2017-11-17 2018-05-04 芜湖新农夫机械有限公司 It is a kind of to store hot-blast stove from drying
CN107990549B (en) * 2017-11-17 2020-02-11 芜湖新农夫机械有限公司 Self-drying storage hot blast stove
CN109973980A (en) * 2019-04-01 2019-07-05 哈尔滨锅炉厂有限责任公司 50MW grade double flow packet high pressure-temperature pulverized-coal fired boiler

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Granted publication date: 20101215

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