CN105423275A - Biomass direct combustion power plant flue gas waste heat utilization system and method - Google Patents
Biomass direct combustion power plant flue gas waste heat utilization system and method Download PDFInfo
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- CN105423275A CN105423275A CN201510946947.6A CN201510946947A CN105423275A CN 105423275 A CN105423275 A CN 105423275A CN 201510946947 A CN201510946947 A CN 201510946947A CN 105423275 A CN105423275 A CN 105423275A
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- flue
- temperature
- gas
- flue gas
- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention relates to the field of biomass direct combustion power plant flue gas waste heat utilization, in particular to a biomass direct combustion power plant flue gas waste heat utilization system and a method. The biomass direct combustion power plant flue gas waste heat utilization system comprises a first heat exchanger arranged in a flue gas pipeline, a baking chamber for baking fuel, a second heat exchanger arranged in the baking chamber, a water circulating system, and a control system for controlling the water circulating system to operate, wherein the water circulating system provides condensation water to the first heat exchanger, and provides power to and cools the condensation water subjected to first-time heat exchange by the first heat exchanger and second-time heat exchange by the second heat exchanger. According to the biomass direct combustion power plant flue gas waste heat utilization system and the method, with the adoption of the water circulating system, the fuel is baked in advance by indirectly using flue gas waste heat, the combustion characteristics of the fuel are optimized by using the flue gas waste heat to the greatest extent, and the economic benefits of a power plant are improved greatly.
Description
Technical field
The present invention relates to biomass direct-fired power-plant flue gas field of waste heat utilization, is particularly a kind of biomass direct-fired power-plant flue gas bootstrap system and method.
Background technology
Living beings are a kind of new forms of energy, because of its there is rich reserves, carbon neutralization, reproducible advantage given great expectations by the mankind.At present ripe in the world and biomass energy transform mode that is scale application is biomass direct combustion power generation technology, namely generated electricity by boiler combustion living beings.
Biomass direct-fired boiler of power plant exhaust gas temperature is about 200 DEG C usually, and this part of waste heat, when directly entering air without when utilization, thus causes energy waste and environmental thermal pollution problem.On the other hand, the living beings used in biomass electric power plant are generally stalk, wood chip etc., and the moisture in fuel is higher, without the fuel cured in advance because cohesive force increases, easily cause the blocking of conveyance conduit, increase the difficulty of charging.Fuel contained humidity evaporation when boiler combustion can consume a large amount of heats, both reduces boiler thermal output, and also cause the actual calorific value of fuel to reduce, furnace temperature is difficult to reach setting value thus the stability of influential system simultaneously.In addition, in the environment that water vapour content is higher, in flue gas, gaseous alkali metal is easier adheres at tube wall heating surface place and forms galvanic cell, thus causes the deposit attack problem of tube wall, reduces the heat transfer efficiency of boiler and threatens the safe operation of system.
Therefore while consideration is to the utilization of fume afterheat, also curing in advance to fuel will be considered, owing to considering that the direct heat source that flue gas is difficult to cure in advance as fuel because dustiness is excessive uses from technique and cost angle.If indirectly realize fume afterheat curing in advance fuel by circulation, the thermal efficiency of boiler can not only be improved, effectively can also alleviate a series of boiler problems because high-moisture contained by fuel brings.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of biomass direct-fired power-plant flue gas bootstrap system, the exhaust gas temperature of biomass direct-fired power plant can be reduced to improve the thermal efficiency of boiler, and circulation is used while realizing fume afterheat comprehensive utilization, indirect utilization fume afterheat cures in advance biomass fuel thus improves fuel value and effective a series of boiler problems of bringing because of high-moisture contained by fuel of alleviation.
Also provide a kind of biomass direct-fired power-plant flue gas residual-heat utilization method on the other hand.
The technical solution used in the present invention is:
One aspect of the present invention provides a kind of biomass direct-fired power-plant flue gas bootstrap system, and this system comprises:
In flue, First Heat Exchanger is set;
Baking chamber for curing fuel is set;
The second heat exchanger arranged in described baking chamber;
For providing condensed water to described First Heat Exchanger, and the condensed water after described First Heat Exchanger first time heat exchange after heat exchange is provided after described second heat exchanger second time heat exchange the water circulation system of power and cooling;
For controlling the control system of described system cloud gray model.
Further, described water circulation system comprises system:
Water receptacle, provides condensed water source to First Heat Exchanger;
Water pump, flows through the condensed water forced circulation in water receptacle the First Heat Exchanger be arranged in feed channel;
Cooling tower, for being cooled to normal temperature by the condensed water after described second heat exchanger heat exchange.
Further, described control system comprises system:
Gather the temperature sensor of flue end flue-gas temperature;
Gather the humidity sensor of flue end flue gas relative humidity;
Gather condensate flow, be arranged on the flow sensor in water circulation system loop;
Control the frequency converter of pump power power in water circulation system;
Receive temperature data, relative humidity data and data on flows, and according to the controller of Data Control power converter output received.
Further, the dew-point temperature that described controller is corresponding according to flue gas relative humidity calculation flue end flue gas, makes comparisons the flue-gas temperature data value that itself and controller receive system;
When flue end flue-gas temperature is lower than flue gas dew point temperature, automatically reduces circulating water flow to improve end flue-gas temperature, make exhaust gas temperature be increased to more than dew-point temperature;
When flue end flue-gas temperature is higher than flue gas dew point temperature, increases circulating water flow to reduce end flue-gas temperature, make exhaust gas temperature close to dew-point temperature.
The present invention also provides a kind of biomass direct-fired power-plant flue gas residual-heat utilization method, and the method comprises:
Heat in flue is carried out the condensed water that first time heat exchange obtains high temperature by employing heat exchanger;
Condensed water after heat exchange is carried out second time heat exchange to fuel in baking chamber and obtains the condensed water after lowering the temperature;
Again described first time heat exchange is adopted to complete a circulation to the heat in flue after being cooled by condensed water after cooling;
Above-mentioned steps is controlled automatically.
Method further,
Automatic control process comprises:
Gather flue end flue-gas temperature;
Gather flue end flue gas relative humidity;
Gather condensate flow;
According to temperature, relative humidity and condensate flow, according to temperature and relative humidity, change condensate flow thus control the degree of heat exchange and the degree of the second heat exchange for the first time.
Method further, according to temperature, relative humidity and condensate flow, according to temperature and relative humidity, changes condensate flow and comprises:
The dew-point temperature corresponding according to relative humidity calculation flue end flue gas, makes comparisons itself and flue-gas temperature value;
When flue end flue-gas temperature is lower than flue gas dew point temperature, automatically reduces circulating water flow to improve end flue-gas temperature, make exhaust gas temperature be increased to more than dew-point temperature;
When flue end flue-gas temperature is higher than flue gas dew point temperature, increases circulating water flow to reduce end flue-gas temperature, make exhaust gas temperature close to dew-point temperature.
Temperature when steam reaches capacity in flue gas is just called " dew-point temperature ".Dew-point temperature is corresponding with the relative humidity in flue gas, and according to the relative humidity of flue gas, controller can calculate the dew-point temperature of flue gas.Time in the process utilizing fume afterheat, flue-gas temperature can reduce gradually, in order to avoid flue-gas temperature is reduced to below its dew-point temperature, causes the part steam in flue gas condense and cause the etching problem of boiler tube wall, therefore needs to arrange automatic control system.
Compared with prior art, beneficial effect is in the present invention: the present invention uses circulation indirect utilization fume afterheat to cure in advance fuel, maximally utilises fume afterheat, drastically increases economy of power plant benefit.Specifically, the present invention has the following advantages:
1) the present invention effectively make use of biomass direct-fired boiler of power plant tail flue gas waste heat, reduces exhaust gas temperature further to reduce the thermal pollution to surrounding environment, and improves boiler thermal output;
2) the present invention selects with circulating water heat-exchanging system indirect utilization fume afterheat, curing in advance biomass fuel is achieved with simple technique, the calorific value of fuel combustion can be improved, also effectively can slow down a series of boiler problems because high-moisture contained by fuel brings;
3) condensate water as delivered heat working medium in circulation of the present invention recycles all the time, has saved water resource;
4) the present invention introduces automatic control system, and circulation can, according to the change automatic regulating water flow amount of service condition, realize, under the prerequisite ensureing security of system stable operation, ensureing the maximization of efficiency of thermal cycle and system economy.
Accompanying drawing explanation
The system global structure schematic diagram that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention is a kind of biomass direct-fired power-plant flue gas residual-heat utilization method, and the heat in flue is carried out the condensed water that first time heat exchange obtains high temperature by employing heat exchanger;
Condensed water after heat exchange is carried out second time heat exchange to fuel in baking chamber and obtains the condensed water after lowering the temperature;
Again described first time heat exchange is carried out to the heat in flue after being cooled by condensed water after cooling and complete a circulation;
In order to the automatic control realizing discharge meets the requirement to flue end flue-gas temperature, therefore need to gather flue end flue-gas temperature; Gather flue end flue gas relative humidity; Gather condensate flow; According to temperature, relative humidity and condensate flow, according to temperature and relative humidity, change condensate flow thus control the degree of heat exchange and the degree of the second heat exchange for the first time.Be specially:
Calculate dew-point temperature corresponding to flue end flue gas by the relative humidity data measured, itself and flue-gas temperature are made comparisons;
When flue end flue-gas temperature is lower than flue gas dew point temperature, automatically reduces circulating water flow to improve end flue-gas temperature, make exhaust gas temperature be increased to more than dew-point temperature;
When flue end flue-gas temperature is higher than flue gas dew point temperature, increases circulating water flow to reduce end flue-gas temperature, make exhaust gas temperature close to dew-point temperature.
See Fig. 1, the embodiment of the present invention be a kind of biomass direct-fired power-plant flue gas bootstrap system for realizing above-mentioned method, First Heat Exchanger 8 is set in flue; The baking chamber 11 for curing fuel arranged; The second heat exchanger 12 arranged in baking chamber 11; Arrange and be used for providing condensed water to First Heat Exchanger 8, and after the second heat exchanger 12 second time heat exchange, provide the water circulation system 17 of power and cooling by the condensed water after First Heat Exchanger 8 first time heat exchange after heat exchange; Water circulation system 17 comprises, water receptacle 1, adopt open cistern, be supplied to the condensed water required for whole system, be set to the water pump 4 that water circulation provides power, in the present embodiment, water pump 4 is set between water receptacle 1 and First Heat Exchanger 8, by water pump semi-finals system, the condensate water circulatory in water receptacle 1 is flowed through the First Heat Exchanger 8 be arranged in feed channel; And between water receptacle 1 and water pump 4, establish inlet non-return valve 2 and inlet valve 3 successively, arrange cooling tower 13, in the present embodiment, cooling tower is arranged between the second heat exchanger 12 and water receptacle 1, for by the second heat exchanger 12 out be water-cooled to normal temperature, and then to enter in the middle of next circulation.
Be arranged between the First Heat Exchanger 8 in biomass direct-fired boiler of power plant tail flue gas pipeline 7 and the second heat exchanger 12 in baking chamber 11 and be furnished with stop valve 9, prevent reflux problem further.
Exhaust gas temperature should be reduced as far as possible to maximally utilise fume afterheat, but avoid flue-gas temperature lower than dew-point temperature thus condensation phenomenon occurs.What whole system adopted is automatic control system 18 control realization automatically.
Therefore the temperature sensor 5 gathering flue end flue-gas temperature is set; Gather the humidity sensor 6 of flue end flue gas relative humidity; Gather condensate flow, be arranged on the flow sensor 10 in water circulation system loop; Be arranged in the present embodiment between stop valve 9 and the second heat exchanger 12.In order to realize the control of discharge, be therefore provided with the frequency converter 16 and water pump 4 control connection that control water flowing value in water circulation system; The kernel control chip that control system adopts is PLC 15, temperature sensor 5, humidity sensor 6 and flow sensor 10 are all connected with the input interface of PLC 15, and the output interface of PLC 15 is connected with water pump 4 by frequency converter 16.When power switch 14 is opened, humidity sensor 6 outputs signal and calculates dew-point temperature corresponding to flue gas through PLC 15, itself and the flue-gas temperature signal value inputted are made comparisons, and export a PID controlling value to frequency converter 16, this controlling value is standard analog signal, frequency converter 16 exports the power supply signal feed pump 4 of corresponding frequencies after computing, thus realizes the automatic adjustment of discharge.When biomass direct-fired boiler of power plant tail flue gas pipeline 7 end flue-gas temperature is lower than flue gas dew point temperature, automatically reduces circulating water flow to improve end flue-gas temperature, thus make exhaust gas temperature be increased to more than dew-point temperature; When biomass direct-fired boiler of power plant tail flue gas pipeline 7 end flue-gas temperature is far above flue gas dew point temperature, automatically increases circulating water flow to reduce end flue-gas temperature, make exhaust gas temperature close to dew-point temperature.Thus realize, under the prerequisite ensureing security of system stable operation, ensureing the maximization of efficiency of thermal cycle and system economy.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a biomass direct-fired power-plant flue gas bootstrap system, is characterized in that, this system comprises:
In flue, First Heat Exchanger is set;
Baking chamber for curing fuel is set;
The second heat exchanger arranged in described baking chamber;
For providing condensed water to described First Heat Exchanger, and the condensed water after described First Heat Exchanger first time heat exchange after heat exchange is provided after described second heat exchanger second time heat exchange the water circulation system of power and cooling;
For controlling the control system of described system cloud gray model.
2. according to system according to claim 1, it is characterized in that, described water circulation system comprises:
Water receptacle, provides the source of condensed water to First Heat Exchanger;
Water pump, flows through the condensed water forced circulation in water receptacle the First Heat Exchanger be arranged in feed channel;
Cooling tower, for being cooled to normal temperature by the condensed water through described second heat exchanger.
3. according to the system described in claim 1 or 2, it is characterized in that, described control system comprises:
Gather the temperature sensor of flue end flue-gas temperature;
Gather the humidity sensor of flue end flue gas relative humidity;
Gather condensate flow, be arranged on the flow sensor in water circulation system loop;
Control the frequency converter of pump power power in water circulation system;
Receive temperature data, relative humidity data and data on flows, and according to the controller of Data Control power converter output received.
4. according to system according to claim 3, it is characterized in that the flue-gas temperature data value that itself and controller receive is made comparisons by the dew-point temperature that described controller is corresponding according to flue gas relative humidity calculation flue end flue gas;
When flue end flue-gas temperature is lower than flue gas dew point temperature, automatically reduces circulating water flow to improve end flue-gas temperature, make exhaust gas temperature be increased to more than dew-point temperature;
When flue end flue-gas temperature is higher than flue gas dew point temperature, increases circulating water flow to reduce end flue-gas temperature, make exhaust gas temperature close to dew-point temperature.
5. a biomass direct-fired power-plant flue gas residual-heat utilization method, it is characterized in that, the method comprises:
Heat in flue is carried out the condensed water that first time heat exchange obtains high temperature by employing heat exchanger;
Condensed water after heat exchange is carried out second time heat exchange to fuel in baking chamber and obtains the condensed water after lowering the temperature;
Again described first time heat exchange is adopted to complete a circulation to the heat in flue after being cooled by condensed water after cooling;
Above-mentioned steps is controlled automatically.
6. in accordance with the method for claim 5, it is characterized in that,
Automatic control process comprises:
Gather flue end flue-gas temperature;
Gather flue end flue gas relative humidity;
Gather condensate flow;
According to temperature, relative humidity and condensate flow, according to temperature and relative humidity, change condensate flow thus control the degree of heat exchange and the degree of the second heat exchange for the first time.
7. in accordance with the method for claim 6, it is characterized in that, according to temperature, relative humidity and condensate flow, according to temperature and relative humidity, change condensate flow and comprise:
The dew-point temperature corresponding according to relative humidity calculation flue end flue gas, makes comparisons itself and flue-gas temperature value;
When flue end flue-gas temperature is lower than flue gas dew point temperature, automatically reduces circulating water flow to improve end flue-gas temperature, make exhaust gas temperature be increased to more than dew-point temperature;
When flue end flue-gas temperature is higher than flue gas dew point temperature, increases circulating water flow to reduce end flue-gas temperature, make exhaust gas temperature close to dew-point temperature.
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| CN201510946947.6A CN105423275A (en) | 2015-12-17 | 2015-12-17 | Biomass direct combustion power plant flue gas waste heat utilization system and method |
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| CN201510946947.6A CN105423275A (en) | 2015-12-17 | 2015-12-17 | Biomass direct combustion power plant flue gas waste heat utilization system and method |
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| CN105423275A true CN105423275A (en) | 2016-03-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106701243A (en) * | 2017-01-13 | 2017-05-24 | 沈阳航空航天大学 | Biomass water washing-baking combined pretreatment and potassium resource recovery poly-generation system |
| CN109373786A (en) * | 2018-09-21 | 2019-02-22 | 茌平信发华宇氧化铝有限公司 | Alumina production line and boiler of power plant resource reutilization linked system |
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Application publication date: 20160323 |
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