CN1155640A - Supplying heat to externally fired power system - Google Patents
Supplying heat to externally fired power system Download PDFInfo
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- CN1155640A CN1155640A CN 96121043 CN96121043A CN1155640A CN 1155640 A CN1155640 A CN 1155640A CN 96121043 CN96121043 CN 96121043 CN 96121043 A CN96121043 A CN 96121043A CN 1155640 A CN1155640 A CN 1155640A
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Abstract
Apparatus and method for supplying heat to an externally fired power system by using a multistage system having two or more combustion zones, Each combustion zone has an associated heat exchanger that conveys a respective working fluid stream from the externally fired power system, Each combustion zone receives a portion of the total amount of combustion fuel, and the amount of fuel and air supplied to each combustion zone is adjusted to control the temperature to a predetermined value.
Description
The invention relates to the heat supply of a kind of external-burning dynamical system.
In direct-fired power plant, to combustion air, the fuel of combustion chamber supply through preheating, for example coal dust is burned in the combustion chamber.Pipe around flame zone contains a kind of working solution (for example water), and this working solution is heated to boiling, is transported to the energy that a dynamical system (for example a kind of steam turbine) converts a kind of useful form to then, as electric energy.United States Patent (USP) 5450821 has been described a kind of multi-stage combustion system, and this system adopts combustion chamber and the heat exchanger that separates, and the temperature of the control heat that discharge at different levels adapts with the thermal performance with working solution, and temperature is remained under the temperature that produces NOx gas.
Generally speaking, feature of the present invention is to have the multilevel system of two or more combustion zones to an external-burning dynamical system heat supply with a kind of.There is a corresponding heat exchanger each combustion zone, sends each working solution stream from the external-burning dynamical system.Each combustion zone receives the part of total amount of fuel, regulates the fuel of each combustion chamber of supply and the quantity of air, and temperature is controlled at a predetermined value.Like this, combustion zone temperature can be controlled, thereby the temperature that can prevent the pipe metal is too high, avoids damaging.In addition, can adopt two or more independently liquid stream cooling end assign to limit the border of stove combustion zone, and help to reduce the temperature of pipe metal, can make a temperature of working solution stream consistent simultaneously, to raise the efficiency with the needs of dynamical system.
In a preferred embodiment, each combustion zone is positioned at same stove, and the air of supplying with one or more combustion zones is used to the heat preheating from flue gas, and the pipeline of heat exchanger is centered around around the combustion zone.Some convective region also, it is associated with the stack gases that receives from the combustion zone, has also comprised heat exchanger simultaneously, and this heat exchanger is used in the heat-exchanger pipeline of convective region the heat of stack gases being sent to each working solution and flows.In the combustion zone, come the working solution stream of automatic heat-exchanger to be connected with the working solution stream in the convective region.
From following description to a specific embodiment and according to claim, other advantage of the present invention and feature will become apparent.
Fig. 1 is one of the present invention and has the work alone schematic diagram of embodiment of apparatus and method of liquid stream of two combustion zones and two;
Fig. 2 be stove combustion zone in the presentation graphs 1 and convection duct layout profile diagram.
Fig. 1 has shown a furnace system, it comprises an air preheater 100, two combustion zones 101 and 102, it is respectively by the stream cooled heat exchanger HE1A of working solution independently with HE2A constitutes, two convection channel districts 103 and 104, and it comprises working solution stream cooled heat exchanger HE2B and HE1B, an external impetus system 105 respectively.Quantity of fuel in fuel stream 5 and 6 and the air capacity in air stream 3 and 4 are by suitable control machinery control, machinery 203,204,205,206 as shown in fig. 1.Dynamical system 105 can be the direct-fired power conversion system in any outside.The required most of heat of energy conversion cycle be not be used for the vaporization of working solution but be used for the overheated of it and again heat power cycle and system, combustion system of the present invention is particularly useful.The example of this class dynamical system is existing to be described, and United States Patent (USP) 4732005 and 4889545 for example here will be in conjunction with reference to these examples.Combination is with reference to United States Patent (USP) 3346561,4489563,5548043,4586340,4604867,4732005,4763480,4899545,4982568,5029444,5095708,5450821 and 5440882 disclosed energy conversion systems in addition.Working solution stream can be inferior cooling liquid, saturated liquid, two-phase liquid, saturated vapor or superheated steam.
With reference to figure 1, combustion air 1 enters air preheater 100 in the position, is preheated at there, and temperature reaches 500-600 °F during to position 2.Quantity of fuel in supplying with the fuel stream 5 of combustion zone 101 only is the part in the burned total amount of fuel.Combustion zone 101 is in the working solution cooling tube of heat exchanger HE1A, and 11 places enter this heat exchanger in the position for first working solution stream, improves after the temperature in the position 12 places and flows out this heat exchanger.The heat of flue gas stream is converted as radiant energy basically.According to the heat that furnace wall on every side need absorb, select to supply with the fuel of combustion chamber and, the temperature of combustion chamber is controlled at a predetermined value through the quantity of the air of preheating.Particularly control the temperature in first combustion zone 101, prevent that the furnace wall temperature in the heat exchanger HE1A is too high, to avoid damaging heat exchanger.
The flue gas that comes out from first combustion zone 101 flows into second combustion zone 102 through position 7, and this flue gas mixes with combustion air flow 4 and fuel stream 6.Temperature in the control combustion zone 102 prevents that the furnace wall temperature in the heat exchanger HE2A is too high, to avoid damaging heat exchanger.Combustion zone 102 is within the working solution cooling tube of heat exchanger HE2A, and 13 places enter this heat exchanger HE2A in the position for second working solution stream, improves after the temperature in the position 14 places and flows out this heat exchanger.
The convection duct that the flue gas that comes out from second combustion zone 102 leads to first convective region 103 of stove, in the heat exchanger HE2B of this convective region, flue gas is cooled.With the situation of the second work liquid flowing connection under, the 3rd working solution stream enters heat exchanger HE2B at 15 places, improves after the temperature in the position 16 places and flows out this heat exchanger HE2B, gets back to dynamical system 105 then.9 places in the position, flue gas leaves convective region 103 to be lower than its temperature when the position 8, and enters second convective region 104.
Similarly, owing to emit heat in heat exchanger HE1B, flue gas is further cooled in second convective region 104.With the situation of the first work liquid flowing connection under, 17 places enter heat exchanger HE1B in the position for the 4th working solution stream, improve after the temperature in the position 18 places and flow out this heat exchanger HE1B, get back to dynamical system 105 then.10 place's flue gases leave convection duct in the position, and flow to air preheater 100.In air preheater 100, this flue gas is further cooled, and heat is discharged to combustion air flow, and temperature reduces the back and leads to flue in 11 places in the position.
An important advantage of multistage stove scheme is, by controlling the ignition temperature that is reached in each flame zone respectively to the adjusting of fuel and air stream.Can utilize the assistant manager to think proportioning or cross stoichiometric(al) and burn and be controlled at the temperature of first order flame zone.In addition, utilize the liquid stream that works alone to constitute the stove periphery, just can in the highest temperature district of stove, utilize the cooling of working solution stream.Working solution stream is heated in the convection duct of stove for the last time.The present invention with a kind of method of being convenient to control combustion zone temperature to the heat supply of direct combustion furnace system, so that prevent that the temperature of metal tube is too high.
We have described a kind ofly has by two the work alone combustion zone of liquid stream cooling and the level twos of convection duct, and these two the liquid streams that work alone are serially connected between combustion zone and the convection duct.Under every kind of situation, a flue gas stream has comprised all flue gases that come from preceding step.Can include other change of three grades of similarity and level Four system.In addition, can only cool off some parts in the stove or the some parts in the convection duct with the liquid stream that works alone.
Claims (22)
1. the method for an external fired power system heat supply comprises the following steps:
The first of first air stream and total amount of fuel is sent into first combustion zone;
At the said first of said first combustion zone internal combustion fuel, form first flue gas stream;
In the pipeline of first heat exchanger that is exposed to said first combustion zone, first working solution that heat from said first combustion zone is transferred from an external-burning dynamical system flows, regulate the fuel of supply first combustion zone and the amount of air, so that the temperature of first combustion zone is controlled at first predetermined value;
The second portion of said first flue gas stream, second air stream and total amount of fuel is supplied with second combustion zone;
At the said second portion fuel of the said second combustion zone internal combustion, form second flue gas stream; With
In the pipeline of second heat exchanger that is exposed to said second combustion zone, second working solution that heat from said second combustion zone is transferred from an external-burning dynamical system flows, regulate the fuel of supply second combustion zone and the quantity of air, the temperature of second combustion zone is controlled at second predetermined value.
2. according to the said method of claim 1, wherein, said first and second districts are in same stove.
3. according to the said method of claim 1, wherein, said first air is fluently used the heat preheating from said second flue gas stream.
4. according to the said method of claim 3, wherein, said second air is fluently used the heat preheating from said second flue gas stream.
5. according to the said method of claim 2, wherein, the pipeline of said first heat exchanger is centered around around said first combustion zone, and the pipeline of said second heat exchanger is centered around around said second combustion zone.
6. according to the said method of claim 1, further comprise, the said second flue gas stream first convective region of flowing through, and in being exposed to the 3rd heat-exchanger pipeline of said first convective region, the heat from said first convective region is transferred the 3rd working solution stream from an external-burning dynamical system.
7. according to the said method of claim 6, further comprise, the said second flue gas stream that comes from said first convective region second convective region of flowing through, and in being exposed to the 4th heat-exchanger pipeline of said second convective region, the heat from said second convective region is transferred the 4th working solution stream from an external-burning dynamical system.
8. according to the said method of claim 6, wherein, said the 3rd working solution stream is connected in series with during said first and second working solutions flow one.
9. according to the said method of claim 7, wherein, one in said the 3rd working solution stream and said first and second working solutions stream is connected in series, and said the 4th working solution stream is connected in series with during said first and second working solutions flow another.
10. according to the said method of claim 7, wherein, said first and second air are fluently used the heat preheating that receives from said second convective region from said second flue gas stream.
11. according to the said method of claim 1, further comprise,
The combustion zone of one or more mutual serial connections in addition is set, to receive the other corresponding part in second flue gas stream, in addition corresponding air stream and the total amount of fuel;
In addition corresponding part in the said other said total amount of fuel of combustion zone internal combustion forms in addition corresponding flue gas stream;
In the pipeline of the other heat exchanger that is exposed to said other combustion zone, heat from said other combustion zone is transferred the corresponding stream of working solution in addition from the external-burning dynamical system, regulate the fuel of the other combustion zone of supply and the quantity of air, so that the temperature of other combustion zone is controlled at each corresponding predetermined value.
12. the device of an outside fired power system heat supply comprises:
First combustion zone is communicated with the first that receives first air stream and total amount of fuel, and first flue gas stream is provided, and the first flue gas stream includes the product at the said first of said first combustion zone internal combustion fuel;
First heat-exchanger pipeline, it is exposed to said first combustion zone, and transmission is from first working solution stream of external-burning dynamical system;
Controlling organization is used to control the fuel of said first combustion zone of supply and the quantity of air, and the temperature of controlling first combustion zone is in first predetermined value;
Second combustion zone receives the second portion of said first flue gas stream, second air stream and total amount of fuel, and second flue gas stream is provided, and the second flue gas stream includes the product at the said second portion fuel of the said second combustion zone internal combustion;
Second heat-exchanger pipeline, it is exposed to said second combustion zone, and transmission is from second working solution stream of external-burning dynamical system;
Controlling organization is used to control the fuel of said second combustion zone of supply and the quantity of air, and the temperature of controlling second combustion zone is in second predetermined value;
13. according to the said device of claim 12, wherein said first and second districts are in same stove.
14. according to the said device of claim 12, further comprise a preheater, be used to utilize the heat of said second flue gas stream to come said first air stream of preheating.
15. according to the said device of claim 14, wherein said preheater utilizes the heat of said second flue gas stream to come said second air stream of preheating.
16. according to the said device of claim 13, wherein, the pipeline of said first heat exchanger is around said first combustion zone, the pipeline of said second heat exchanger is around said second combustion zone.
17., further comprise according to the said device of claim 12:
First convective region, be communicated with to receive said second flue gas stream that comes from said second combustion zone and
The 3rd heat-exchanger pipeline, it is exposed to said first convective region, and transmission is from the 3rd working solution stream of external-burning dynamical system.
18., further comprise according to the said device of claim 17:
Second convective region, be communicated with to receive said second flue gas stream that comes from said first convective region and
The 4th heat-exchanger pipeline, it is exposed to said second convective region, and transmission is from the 4th working solution stream of external-burning dynamical system.
19. according to the said device of claim 17, wherein, said the 3rd working solution stream is connected in series with during said first and second working solutions flow one.
20. according to the said device of claim 18, wherein, one in said the 3rd working solution stream and said first and second working solutions stream is connected in series, and said the 4th working solution stream is connected in series with during said first and second working solutions flow another.
21. according to the said device of claim 18, further comprise a preheater, the heat that is used to utilize said second flue gas stream to receive from said second convective region comes said first and second air stream of preheating.
22., further comprise according to the said device of claim 12:
The combustion zone of one or more mutual serial connections in addition is to receive the other corresponding part in second flue gas stream, in addition corresponding air stream and the total amount of fuel;
Other heat-exchanger pipeline, it is exposed to said other combustion zone, and transmission is from the other corresponding work liquid stream of external-burning dynamical system;
Other controlling organization is used to control the fuel of supplying with said other combustion zone and the quantity of air, and the temperature of controlling other combustion zone is in other predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96121043 CN1155640A (en) | 1995-10-20 | 1996-10-19 | Supplying heat to externally fired power system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US546419 | 1995-10-20 | ||
| CN 96121043 CN1155640A (en) | 1995-10-20 | 1996-10-19 | Supplying heat to externally fired power system |
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| Publication Number | Publication Date |
|---|---|
| CN1155640A true CN1155640A (en) | 1997-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 96121043 Pending CN1155640A (en) | 1995-10-20 | 1996-10-19 | Supplying heat to externally fired power system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449252C (en) * | 2004-01-09 | 2009-01-07 | 丹福斯有限公司 | Multi-stage heat-exchanger assembly |
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1996
- 1996-10-19 CN CN 96121043 patent/CN1155640A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449252C (en) * | 2004-01-09 | 2009-01-07 | 丹福斯有限公司 | Multi-stage heat-exchanger assembly |
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