CN203421665U - Turbine and furnace coupled brown coal drying energy-saving system - Google Patents
Turbine and furnace coupled brown coal drying energy-saving system Download PDFInfo
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- CN203421665U CN203421665U CN201320490712.7U CN201320490712U CN203421665U CN 203421665 U CN203421665 U CN 203421665U CN 201320490712 U CN201320490712 U CN 201320490712U CN 203421665 U CN203421665 U CN 203421665U
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Abstract
The utility model belongs to the field of power station energy-saving equipment, and particularly relates to a turbine and furnace coupled brown coal drying energy-saving system. The system is composed of a brown coal drying subsystem, an air preheating subsystem, a steam turbine side heat regenerating system and a waste heat utilization system, wherein the brown coal drying subsystem is connected with the steam turbine side heat regenerating system and the air preheating subsystem, and a low-temperature economizer in the waste heat utilization system is arranged behind a main air pre-heater of the air preheating subsystem and connected with the steam turbine side heat regenerating system. The heat source of the brown coal drying system comes from low-pressure cylinder steam extraction of a steam turbine, and dried brown coal is directly used for electricity generation. Gas steam produced in the drying process of brown coal enters a front air preheating system, low-temperature air is preheated, heated air enters the main air pre-heater, and the whole-course heating of air is completed. According to the system, the energy density of brown coal is increased, a large amount of latent heat in the dry tail gas is recycled, meanwhile, heat of smoke is recycled, coal consumption of a brown coal unit can be greatly lowered, and efficiency of the unit can be improved.
Description
Technical field
The utility model belongs to energy-saving equipment field, power station, particularly a kind of brown coal drying energy conserving system of machine stove coupling.
Background technology
The energy consumption structure of China be take coal as main always, and within quite long period, coal is still occupied an leading position in China's primary energy.Due to bituminous coal in world wide and anthracitic excessive exploitation, lignite resource develops the more tired various countries that are more subject to and payes attention to.The explored lignite resource of China reaches more than 1,300 hundred million tons, accounts for 13% of national coal reserves.Brown coal are coals that degree of metamorphism is minimum, and volatile matter is generally 40%～50%, and total moisture can reach 35%～50%, and air-dried moisture is 10%～20%, and low heat valve generally only has 7～15MJ/kg, and degree of coalification is between peat and bituminous coal.
China's electricity coal is in short supply in recent years, and brown coal price is lower, and sulfur content is lower, and increasing power plant starts to use brown coal generating.Because the moisture of brown coal own is higher, participate in burning directly, in ignition process, need a large amount of energy on the one hand, brown coal volatile matter is high in addition, easily blast; The exhaust gas volumn that brown coal burning simultaneously generates is bigger than normal, and exhaust gas temperature is higher, makes boiler exhaust gas heat loss serious, and power plant thermal efficiency is low, and greenhouse gas emissions are also larger; In addition, high-moisture brown coal calorific value is lower, makes boiler body bulky, and boiler accessory machinery capacity is also bigger than normal, has greatly increased power station investment and station service power consumption rate.
At present, for the problems referred to above, before thermal power plant burning brown coal, be dried brown coal, brown coal are dried, after making the water content of brown coal be reduced to a certain degree, then brown coal are transported to and in boiler, burn and generate electricity.But the moisture evaporation in brown coal drying process is an a large amount of process that consumes heat energy, traditional brown coal drying system, contains large quantity of air in the moisture of evaporation, and moisture latent heat can not be utilized.Drying system is set separately to be caused the numerous and diverse of electrification technique as well as and operation, manages inconvenience.
Summary of the invention
The utility model is independent of electricity generation system conventionally mainly for brown coal drying system in the thermal power plant of current combustion brown coal, the numerous and diverse and operation of electrification technique as well as, management inconvenience; The features such as steam latent heat can not effectively utilize, exhaust gas temperature height, low-grade heat source, fails effectively to make full use of, and causes the situation of the wasting of resources, and a kind of brown coal drying energy conserving system of machine stove coupling is provided.
The technical solution adopted in the utility model is:
This system is comprised of brown coal drying subsystem, air preheat subsystem, steamer pusher side heat regenerative system and UTILIZATION OF VESIDUAL HEAT IN subsystem, and low-level (stack-gas) economizer is set in boiler flue:
Described brown coal drying subsystem is comprised of feeder, drier and separator, and feeder is connected with drier, and the gas vent of drier is connected with separator, and the solid outlet of drier and separator is connected with coal pulverizer;
Described air preheat subsystem is comprised of the forward type air preheater connecting successively and primary air preheater; Before primary air preheater is arranged on low-level (stack-gas) economizer;
Described steamer pusher side heat regenerative system comprises No. 5 bleeder heaters, No. 6 bleeder heaters, No. 7 bleeder heaters, No. 8 bleeder heaters of series connection successively, and four bleeder heaters are connected with Steam Turbine Through IP Admission, turbine low pressure cylinder respectively;
In described brown coal drying subsystem, the air intake of drier is connected with No. 5 bleeder heaters, and saturation water outlet is connected with the drain water piping of No. 5 bleeder heaters, and the steam drain of separator is connected with forward type air preheater.
In described UTILIZATION OF VESIDUAL HEAT IN subsystem, the entrance and exit of low-level (stack-gas) economizer respectively with the entrance of No. 7 bleeder heater condensate water, the condensate water of No. 6 bleeder heaters outlet is connected, after low-level (stack-gas) economizer, set gradually deduster and air-introduced machine.
The beneficial effects of the utility model are:
(1) by UTILIZATION OF VESIDUAL HEAT IN, arrange low-level (stack-gas) economizer, reclaim smoke discharging residual heat, Substitute For Partial extracted steam from turbine, has reclaimed the acting of part steam turbine; Because primary air preheater intake air temperature improves, the flue-gas temperature that causes discharging fume increases, thereby improve the flue gas utilization scope of low-level (stack-gas) economizer, the brown coal drying system of this machine stove coupling is compared alternative more senior regenerative steam with simple bootstrap system, further improve energy-saving effect.
(2) drying system is connected with former pulverized coal preparation system, utilize the part condensation heat drying brown coal in drying machine that draws gas for No. 5, former moisture content of coal can reduce, the energy density of coal improves, realize system brown coal drying, not only be conducive to the smooth combustion of coal, also reduced the flue gas loss of boiler, improve boiler efficiency;
(3) brown coal drying after-burning moisture content of coal reduces, and the energy density of coal improves, and low heat valve reaches bituminous coal level, produces exhaust gas volumn and reduces, and boiler furnace volume reduces, and subsidiary engine is exerted oneself and guaranteed, power station initial cost reduces;
(4) brown coal drying after-burning moisture content of coal reduces, and in flue gas, water vapour content reduces, and can greatly reduce the cold end corrosion problem of back-end ductwork, thereby can further reduce exhaust gas temperature, and the outlet cigarette temperature of low-level (stack-gas) economizer, improves boiler efficiency.
(5) by utilizing a large amount of steam that evaporate in coal to discharge latent heat in preheated air in preposition air preheater after separation, after condensation heat, pass into sewage recovering system, a large amount of steam latent heat and moisture have been reclaimed, indirectly reclaim the heat that draws gas of part drying brown coal consumption, reduced energy consumption and the water consumption in power station.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of structure of the present invention.
Number in the figure:
1-feeder; 2-drier; 3-separator; 4-forward type air preheater; 5-air-introduced machine; 6-deduster; 7-low-level (stack-gas) economizer; 8-primary air preheater; 9-5 bleeder heater; 10-6 bleeder heater; 11-7 bleeder heater; 12-8 bleeder heater; 13-condenser; 14-rotor machine; 15-Steam Turbine Through IP Admission; 16-turbine low pressure cylinder; A-brown coal drying subsystem; B-air preheat subsystem.
The specific embodiment
The utility model provides a kind of brown coal drying energy conserving system of machine stove coupling, below in conjunction with the drawings and specific embodiments, it is described further.
Figure 1 shows that the schematic diagram of the brown coal drying energy conserving system structure of machine stove coupling.This system is mainly comprised of brown coal drying subsystem a, air preheat subsystem b, steamer pusher side heat regenerative system and UTILIZATION OF VESIDUAL HEAT IN subsystem.
Brown coal drying subsystem a is comprised of feeder 1, drier 2 and separator 3, and feeder 1 is connected with drier 2, and the gas vent of drier 2 is connected with separator 3, and the solid outlet of drier 2 and separator 3 is connected with coal pulverizer.Air preheat subsystem b is comprised of the forward type air preheater 4 connecting successively and primary air preheater 8; Before primary air preheater 8 is arranged on low-level (stack-gas) economizer 7.Steamer pusher side heat regenerative system comprises 11, No. 8 bleeder heaters 12 of 10, No. 7 bleeder heaters of 9, No. 6 bleeder heaters of No. 5 bleeder heaters of series connection successively, four bleeder heaters are connected with Steam Turbine Through IP Admission 16, turbine low pressure cylinder 15 respectively, and turbine low pressure cylinder 15 is also connected with condenser 13, generator 14.
In brown coal drying subsystem a, the air intake of drier 2 is connected with No. 5 bleeder heaters 9, and saturation water outlet is connected with the drain water piping of No. 5 bleeder heaters 9, and the steam drain of separator 3 is connected with forward type air preheater 4; The entrance and exit of low-level (stack-gas) economizer 7 respectively with the condensate water entrance of No. 7 bleeder heaters 11, the condensate water of No. 6 bleeder heaters 10 outlet is connected, low-level (stack-gas) economizer 7 and primary air preheater 8 are disposed in series in boiler back end ductwork.
In air preheat subsystem b, it is combustion-supporting that air order enters burner hearth after preposition air preheater 4 and 8 heating of primary air preheater, in preposition air preheater 4, after steam condensation heat release, incondensable gas enters atmosphere, and noncondensing gas is sent to waste water recovery and processing system.Primary air preheater 8 boiler back end ductwork and with low-level (stack-gas) economizer 7 arranged in series.Low-level (stack-gas) economizer 7 heat-setting water, import the condensate water outlet of No. 6 bleeder heaters 10 after condensate water heating.
Native system operation principle is as follows:
Air is heated to 60 ℃-80 ℃ in forward type air preheater 4, enters in primary air preheater 8 and is continued heating by flue gas, completes whole heating process, and meanwhile, primary air preheater exit gas temperature improves.After primary air preheater 8, arrange low-level (stack-gas) economizer 7, low-level (stack-gas) economizer 7 temperature are within the scope of 180 ℃-130 ℃, be used for adding No. 6 bleeder heaters 10 in Hot gas turbine regenerative steam system and the condensate water in No. 7 bleeder heaters 11, Substitute For Partial regenerative steam, condensate water after heating enters bleeder heater 10 condensate water outlet sides No. 6, thereby reduction exhaust gas temperature, last flue gas, after deduster 6 dedustings, is sent to desulfurizer.
High-moisture brown coal are directly sent into drier 2 by feeder 1 after crushed, by extracted steam from turbine, heat, and the most of evaporation of moisture in coal, the brown coal after dry heat are discharged and are sent to coal pulverizer grinding from drying machine 2 bottoms.The steam of drier 2 evaporations enters separator 3 with a small amount of coal dust with air mixture and carries out further separated, the coal dust separating enters coal pulverizer, steam after purification enters forward type air preheater 4 condensation heats, after forming subcooled water, enter system for treating wastewater from power plant, incondensable gas enters atmosphere.
Steam Turbine Through IP Admission 15 part is drawn gas for No. 5 and is delivered to drier 2 by pipeline, low-pressure superheated steam is at drier 2 indirect condensation heat transfers, discharge sensible heat and the latent heat of condensation and condense into the saturation water under same equal pressure after to the interior high-moisture brown coal of drier 2, saturation water is delivered to low-pressure heater 9 draining systems No. 5, completes the circulation of drawing gas.
Claims (2)
1. a brown coal drying energy conserving system for machine stove coupling, is comprised of brown coal drying subsystem (a), air preheat subsystem (b), steamer pusher side heat regenerative system and UTILIZATION OF VESIDUAL HEAT IN subsystem, and low-level (stack-gas) economizer (7) is set in boiler flue, it is characterized in that,
Described brown coal drying subsystem (a) is comprised of feeder (1), drier (2) and separator (3), feeder (1) is connected with drier (2), the gas vent of drier (2) is connected with separator (3), and drier (2) is connected with coal pulverizer with the solid outlet of separator (3);
Described air preheat subsystem (b) is comprised of the forward type air preheater (4) connecting successively and primary air preheater (8); Primary air preheater (8) is arranged on low-level (stack-gas) economizer (7) before;
Described steamer pusher side heat regenerative system comprises No. 5 bleeder heaters (9), No. 6 bleeder heaters (10), No. 7 bleeder heaters (11), No. 8 bleeder heaters (12) of series connection successively, and four bleeder heaters are connected with Steam Turbine Through IP Admission (16), turbine low pressure cylinder (15) respectively;
In described brown coal drying subsystem (a), the air intake of drier (2) is connected with No. 5 bleeder heaters (9), saturation water outlet is connected with the drain water piping of No. 5 bleeder heaters (9), and the steam drain of separator (3) is connected with forward type air preheater (4).
2. the brown coal drying energy conserving system that machine stove according to claim 1 is coupled, it is characterized in that: in described UTILIZATION OF VESIDUAL HEAT IN subsystem, the entrance and exit of low-level (stack-gas) economizer (7) respectively with the entrance of No. 7 bleeder heaters (11) condensate water, the condensate water of No. 6 bleeder heaters (10) outlet is connected, after low-level (stack-gas) economizer (7), set gradually deduster (6) and air-introduced machine (5).
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| CN201320490712.7U CN203421665U (en) | 2013-08-12 | 2013-08-12 | Turbine and furnace coupled brown coal drying energy-saving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766854A (en) * | 2017-02-27 | 2017-05-31 | 西安热工研究院有限公司 | A kind of brown coal drying and upgrading electricity generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766854A (en) * | 2017-02-27 | 2017-05-31 | 西安热工研究院有限公司 | A kind of brown coal drying and upgrading electricity generation system |
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