CN211502850U - Boiler system - Google Patents
Boiler system Download PDFInfo
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- CN211502850U CN211502850U CN201922266827.8U CN201922266827U CN211502850U CN 211502850 U CN211502850 U CN 211502850U CN 201922266827 U CN201922266827 U CN 201922266827U CN 211502850 U CN211502850 U CN 211502850U
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- flue gas
- combustion chamber
- carbon dioxide
- heat exchange
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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
- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The utility model provides a boiler system, which comprises a boiler, wherein the boiler comprises a combustion chamber, a flue, a heat exchange structure and a coal economizer capable of recovering heat; the flue is provided with a flue gas inlet and a flue gas outlet, and the flue gas inlet is communicated with the combustion chamber; at least part of the heat exchange structure and the coal economizer are arranged in the flue and positioned between the flue gas inlet and the coal economizer; the heat exchange structure comprises a heat exchange tube, the heat exchange tube is provided with a carbon dioxide inlet and a carbon dioxide outlet, the carbon dioxide inlet is communicated with a heat regenerator for providing carbon dioxide, and the carbon dioxide outlet is connected with a turbine; the boiler still includes flue gas recirculation fan and governing valve, flue gas recirculation fan's air intake and exhanst gas outlet intercommunication, and the air outlet communicates with the combustion chamber, and flue gas recirculation fan is used for sending into the combustion chamber from exhanst gas outlet exhaust at least partial flue gas, and the governing valve is arranged in controlling the flow of the flue gas of sending into in the combustion chamber to can prevent that the boiler from overtemperature, can reduce the content of nitrogen oxide in the flue gas simultaneously.
Description
Technical Field
The utility model relates to a boiler field especially relates to a boiler system.
Background
The boiler system includes a boiler, which is an energy conversion device, that generates high-temperature flue gas by burning fuel in a combustion chamber of the boiler, and transfers heat energy of the high-temperature flue gas to steam, high-temperature water, or other heat carriers having certain heat energy. Steam, high-temperature water or other heat carriers generated in the boiler can be used for daily life, industrial production and a power generation system.
On the one hand, however, the high-temperature flue gas in the boiler combustion chamber has a high calorific value and the temperature is usually much higher than the temperature of the heat carrier, which easily causes the overtemperature of the boiler and brings a serious threat to the normal safe operation of the boiler; on the other hand, the content of nitrogen oxides in the flue gas discharged by the boiler is higher, and the pollution to the atmospheric environment can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a boiler system not only can prevent that the boiler from overtemperature, can reduce the content of nitrogen oxide in the flue gas moreover.
The utility model provides a boiler system, which comprises a boiler, wherein the boiler comprises a combustion chamber, a flue, a heat exchange structure and a coal economizer capable of recovering heat;
the flue is provided with a flue gas inlet and a flue gas outlet, and the flue gas inlet is communicated with the combustion chamber;
at least part of the heat exchange structure and the coal economizer are arranged in the flue, and at least part of the heat exchange structure is positioned between the flue gas inlet and the coal economizer, so that the flue gas entering from the flue gas inlet sequentially passes through at least part of the heat exchange structure and the coal economizer and is discharged from the flue gas outlet; wherein the temperature of the flue gas exiting the flue gas outlet is lower than the temperature of the flue gas entering from the flue gas inlet;
the heat exchange structure comprises a heat exchange tube, the heat exchange tube is provided with a carbon dioxide inlet and a carbon dioxide outlet, flue gas generated in the combustion chamber can exchange heat with carbon dioxide entering the heat exchange tube through the tube wall of the heat exchange tube, the carbon dioxide inlet is communicated with a heat regenerator for providing carbon dioxide, and the carbon dioxide outlet is connected with a turbine so that the carbon dioxide enters the turbine to expand and do work; wherein the temperature of the carbon dioxide exiting the carbon dioxide outlet is higher than the temperature of the carbon dioxide entering from the carbon dioxide inlet;
the boiler still includes flue gas recirculation fan and governing valve, flue gas recirculation fan's air intake with the exhanst gas outlet intercommunication, flue gas recirculation fan's air outlet with the combustion chamber intercommunication, flue gas recirculation fan is used for following exhanst gas outlet exhaust at least partial flue gas is sent into the combustion chamber, the governing valve is used for the control to be sent into the flow of the flue gas in the combustion chamber.
In the boiler system, optionally, the regulating valve is arranged at an air inlet of the flue gas recirculation fan.
According to the boiler system, optionally, the regulating valve is arranged at the air outlet of the flue gas recirculation fan.
In the boiler system as described above, optionally, at least two flue gas recirculation fans are provided;
and the air inlet of each smoke recirculation fan is respectively communicated with the smoke outlet, and the air outlet of each smoke recirculation fan is respectively communicated with the combustion chamber.
In the boiler system according to the above, optionally, the combustion chamber has at least two flue gas recirculation inlets, one flue gas recirculation inlet corresponds to one flue gas recirculation fan, and at least two flue gas recirculation inlets are located on different sides of the combustion chamber.
In the boiler system, optionally, at least two regulating valves are provided, and one regulating valve corresponds to one flue gas recirculation fan.
The boiler system as described above, optionally, the heat exchange structure includes a superheater whose duct is formed as at least a part of the heat exchange tube, the superheater being disposed in the flue and between the flue gas inlet and the economizer;
the heat exchange structure further includes a tubular air-cooled wall formed as the heat exchange tube, the tubular air-cooled wall being disposed on an inner wall of the combustion chamber.
In the boiler system as described above, optionally, the tubular air-cooled wall is disposed circumferentially along an inner wall of the flue.
In the boiler system as described above, optionally, a flue gas treatment device is further disposed at the flue gas outlet.
In the boiler system, optionally, a communication position between the air inlet of the flue gas recirculation fan and the flue is located between the economizer and the flue gas treatment device.
The utility model discloses a boiler system, which comprises a boiler, wherein the boiler comprises a combustion chamber, a flue, a heat exchange structure and a coal economizer capable of recovering heat; the flue is provided with a flue gas inlet and a flue gas outlet, and the flue gas inlet is communicated with the combustion chamber, so that high-temperature flue gas generated after fuel and air in the combustion chamber are combusted can enter the flue through the flue gas inlet; by arranging at least part of the heat exchange structure and the economizer in the flue and positioning at least part of the heat exchange structure between the flue gas inlet and the economizer, high-temperature flue gas entering from the flue gas inlet can firstly pass through at least part of the heat exchange structure and transfer part of heat to the heat exchange structure to become medium-temperature flue gas, the medium-temperature flue gas passes through the economizer and is recycled by the economizer to become low-temperature flue gas, and the low-temperature flue gas is discharged from the flue gas outlet; meanwhile, the heat exchange structure is arranged to be a structure comprising a heat exchange tube, the heat exchange tube is provided with a carbon dioxide inlet and a carbon dioxide outlet, the carbon dioxide inlet is communicated with a heat regenerator for providing low-temperature carbon dioxide, so that high-temperature flue gas generated in the combustion chamber and low-temperature carbon dioxide entering the heat exchange tube can exchange heat through the tube wall of the heat exchange tube, heat of the high-temperature flue gas is transferred to the low-temperature carbon dioxide, the low-temperature carbon dioxide is converted into high-temperature carbon dioxide and is discharged from the carbon dioxide outlet, the carbon dioxide outlet is connected with a turbine, so that the high-temperature carbon dioxide discharged from the carbon dioxide outlet can enter the turbine to expand to do work and drive the turbine to operate, and; in addition, the boiler is provided with a smoke recirculation fan and a regulating valve, an air inlet of the smoke recirculation fan is communicated with a smoke outlet, an air outlet of the smoke recirculation fan is communicated with the combustion chamber, the smoke recirculation fan is used for sending at least part of smoke discharged from the smoke outlet into the combustion chamber, on the first hand, because the temperature of the smoke at the smoke outlet is lower, after being fed into the combustion chamber, the temperature in the combustion chamber can be reduced, thereby preventing the combustion chamber from overtemperature and further ensuring the normal and safe operation of the boiler, and in the second aspect, the introduction of flue gases into the combustion chamber reduces the amount of air injected into the combustion chamber, which reduces the amount of oxygen entering the combustion chamber, thereby not only inhibiting combustion to reduce the temperature of high-temperature flue gas generated by combustion and preventing overtemperature of a combustion chamber, the generation of nitrogen oxides can be inhibited, and the emission of the nitrogen oxides is reduced to protect the atmospheric environment; in addition, the regulating valve can be used for controlling the flow of the flue gas sent into the combustion chamber, so that the temperature change regulation of the outlet temperature of the boiler working medium can be realized by controlling the flow of the flue gas sent into the combustion chamber.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a boiler system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a boiler system according to an embodiment of the present invention.
Description of reference numerals:
1-a combustion chamber;
2-flue;
21-flue gas inlet;
22-a flue gas outlet;
3-a heat exchange structure;
31-heat exchange tubes;
311-carbon dioxide inlet;
312-carbon dioxide outlet;
4-a coal economizer;
5-a flue gas recirculation fan;
6-adjusting the valve;
7-a heat regenerator;
8-turbine.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a boiler system according to an embodiment of the present invention. Fig. 2 is a schematic diagram of a boiler system according to an embodiment of the present invention. The present embodiments provide a boiler system.
The boiler system comprises a boiler, wherein the boiler comprises a combustion chamber 1, a flue 2, a heat exchange structure 3 and a coal economizer 4 capable of recovering heat; wherein, the combustion chamber is also called as a hearth; the flue 2 has a flue gas inlet 21 and a flue gas outlet 22, the flue gas inlet 21 is communicated with the combustion chamber 1, so that flue gas generated after the fuel and air entering the combustion chamber 1 are combusted in the combustion chamber can enter the flue 2 through the flue gas inlet 21.
At least part of the heat exchange structure 3 and the coal economizer 4 are arranged in the flue 2, and at least part of the heat exchange structure 3 is positioned between the flue gas inlet 21 and the coal economizer 4, so that the flue gas entering from the flue gas inlet 21 sequentially passes through at least part of the heat exchange structure 3 and the coal economizer 4 and is discharged from the flue gas outlet 22, wherein the temperature of the flue gas discharged from the flue gas outlet 22 is lower than that of the flue gas entering from the flue gas inlet 21; specifically, the flue gas generated by combustion in the combustion chamber 1 is high-temperature flue gas, and the high-temperature flue gas can pass through the heat exchange structure 3 and exchange heat with the heat exchange structure 3, so that part of heat is exchanged by the heat exchange structure 3 to become medium-temperature flue gas, the medium-temperature flue gas further exchanges heat with the economizer 4 when passing through the economizer 4, so that part of heat is recycled by the economizer 4 to become low-temperature flue gas, and the low-temperature flue gas is finally discharged from the flue gas outlet 22.
The heat exchange structure 3 comprises a heat exchange pipe 31, the heat exchange pipe 31 is provided with a carbon dioxide inlet 311 and a carbon dioxide outlet 312, flue gas generated in the combustion chamber 1 and carbon dioxide entering the heat exchange pipe 31 can exchange heat through the pipe wall of the heat exchange pipe 31, the carbon dioxide inlet 311 is used for being communicated with a regenerator 7 for providing carbon dioxide, the carbon dioxide outlet 312 is used for being connected with a turbine 8, wherein the temperature of the carbon dioxide discharged from the carbon dioxide outlet 312 is higher than that of the carbon dioxide entering from the carbon dioxide inlet 311; specifically, the regenerator 7 is used for preheating carbon dioxide before entering the heat exchange tube 31, the carbon dioxide preheated in the regenerator 7 is low-temperature carbon dioxide, the low-temperature carbon dioxide enters the heat exchange tube 31 through the carbon dioxide inlet 311 and exchanges heat with high-temperature flue gas passing through the heat exchange tube 31 in the flue 2 through the tube wall of the heat exchange tube 31, so that the low-temperature carbon dioxide becomes high-temperature carbon dioxide after absorbing heat of a part of the high-temperature flue gas, the high-temperature carbon dioxide is discharged from the carbon dioxide outlet 312 and enters the turbine 8, and thus the high-temperature carbon dioxide expands in the turbine 8 to apply work to drive the turbine 8 to operate.
The boiler also comprises a flue gas recirculation fan 5 and a regulating valve 6. On the one hand, the flue gas discharged from the flue gas outlet 22 is low-temperature flue gas, and the temperature of the flue gas is lower than that of the combustion chamber 1, so that the temperature in the combustion chamber 1 can be effectively reduced after the low-temperature flue gas is sent into the combustion chamber 1, the combustion chamber 1 can be prevented from being over-heated, and the normal and safe operation of the boiler is further ensured; in the second aspect, since the combustion chamber 1 has a requirement on pressure, under the condition that the volume of the combustion chamber 1 is unchanged and the pressure is determined, the total amount of the air and the low-temperature flue gas introduced into the combustion chamber 1 is basically unchanged, so that the amount of the air introduced into the combustion chamber 1 needs to be reduced when the flue gas is introduced into the combustion chamber 1, the oxygen content in the low-temperature flue gas is much lower than that in the air, that is, the oxygen content entering the combustion chamber 1 is also reduced, combustion can be inhibited to reduce the temperature of the high-temperature flue gas generated by combustion, prevent the combustion chamber 1 from being over-heated, inhibit the generation of nitrogen oxides, and reduce the emission of the nitrogen oxides.
The regulating valve 6 is used for controlling the flow of the flue gas fed into the combustion chamber 1, specifically, when the valve port of the regulating valve 6 is opened to be larger, the flow of the low-temperature flue gas fed into the combustion chamber 1 is also larger, at this time, the large-flow low-temperature flue gas not only can reduce the temperature in the combustion chamber 1 more, but also has stronger combustion inhibition capability, so that the temperature of the high-temperature flue gas generated by combustion can be reduced more, and simultaneously, the temperature of the high-temperature carbon dioxide discharged from the carbon dioxide outlet 312 of the heat exchange pipe 31 can be reduced more; when the valve opening of the regulating valve 6 is smaller, the flow rate of the low-temperature flue gas fed into the combustion chamber 1 is smaller, and at this time, the temperature of the low-temperature flue gas with small flow rate is reduced less in the combustion chamber 1, and the combustion inhibition capability is weaker, so that the temperature of the high-temperature flue gas generated by combustion is reduced less, and the temperature of the high-temperature carbon dioxide discharged from the carbon dioxide outlet 312 of the heat exchange pipe is reduced less; that is, the opening degree of the valve port of the regulating valve 6 is controlled to control the flow rate of the low-temperature flue gas entering the combustion chamber 1, so that the combustion chamber 1 of the boiler can be subjected to temperature change regulation, and further, the high-temperature carbon dioxide discharged from the carbon dioxide outlet 312 of the heat exchange pipe 31 can be subjected to temperature change regulation. In addition, in order to better perform temperature change adjustment on the boiler, a flue gas recirculation rate can be introduced to control the flow of the recirculated low-temperature flue gas, and specifically, the flue gas recirculation rate is the ratio of the flow of the low-temperature flue gas reinjected into the combustion chamber to the total flow of the low-temperature flue gas.
In the concrete implementation, fuel and air are introduced into the combustion chamber 1 of the boiler, so that the fuel and the air generate high-temperature flue gas after being combusted in the combustion chamber 1 of the boiler, the high-temperature flue gas firstly exchanges heat with low-temperature carbon dioxide in the heat exchange tube 31 through the tube wall of the heat exchange tube 31, a part of heat of the high-temperature flue gas is taken away by the low-temperature carbon dioxide to form medium-temperature flue gas, the medium-temperature flue gas can be recovered by the economizer 4 to form low-temperature flue gas when passing through the economizer 4, the low-temperature flue gas is extracted by the flue gas recirculation fan 5 to be a part or all of the low-temperature flue gas to be fed into the combustion chamber, is used for reducing the temperature in the combustion chamber 1, preventing the combustion chamber from overtemperature, and simultaneously carrying out temperature change adjustment on the boiler, on the other hand, the method is used for inhibiting the generation of nitrogen oxides in the combustion chamber and reducing the content of the nitrogen oxides in the smoke emission. In addition, the low-temperature carbon dioxide in the heat exchange pipe 31 takes away a part of heat of the high-temperature flue gas and then becomes high-temperature carbon dioxide, and the high-temperature carbon dioxide is discharged from the carbon dioxide outlet 312 of the heat exchange pipe 31 and then enters the turbine 8, and expands in the turbine 8 to do work, so that the turbine 8 is driven to operate. The heat recovered by the economizer 4 can be used for preheating carbon dioxide and can also be used for other purposes needing a heat source.
The boiler system of the embodiment can be used in a supercritical carbon dioxide Brayton cycle power generation system and can also be used in other places needing the boiler system. For example, in a supercritical carbon dioxide brayton cycle power generation system, the temperature of the low-temperature carbon dioxide preheated by the regenerator 7 is usually above 300 ℃, and due to the existence of the heat exchange temperature pressure, the temperature of the medium-temperature flue gas obtained after the high-temperature flue gas exchanges heat with the low-temperature carbon dioxide in the heat exchange structure 3 is usually above 50 ℃ higher than that of the low-temperature carbon dioxide, so the temperature of the medium-temperature flue gas is usually above 350 ℃, and the temperature of the low-temperature flue gas obtained after the medium-temperature flue gas passes through the economizer is usually between 140 ℃ and 300 ℃. Because the temperature of the low-temperature carbon dioxide entering the boiler system is high (more than 300 ℃), and no phase change occurs in the heat exchange process, the difficulty that the carbon dioxide carries away the heat of the flue gas in a short time is high, so that the overtemperature of the combustion chamber is easily caused, and the low-temperature flue gas needs to be injected into the combustion chamber in a recycling manner to reduce the temperature of the combustion chamber.
The specific way of setting the regulating valve 6 to control the flow of flue gases fed into the combustion chamber 1 includes, but is not limited to, the following two possible implementations:
one possible implementation is: a regulating valve 6 is arranged at the air inlet of the flue gas recirculation fan 5 to regulate the flow of flue gas into the combustion chamber 1.
Another possible implementation is: the regulating valve 6 is arranged at the air outlet of the flue gas recirculation fan 5 to regulate the flow of flue gas entering the combustion chamber 1.
In specific application, the setting position of the regulating valve 6, the installation mode and the like can be selected according to the requirements of practical application such as installation space and the like.
In other embodiments, the regulating valve 6 and the flue gas recirculation fan 5 may be integrated together, and the specific implementation manner may be designed as needed, which is not described herein again.
In order to increase the flow of the low-temperature flue gas entering the combustion chamber 1 and meet the requirement of feeding high-flow low-temperature flue gas into the combustion chamber 1, at least two flue gas recirculation fans 5 can be arranged; the air inlet of each flue gas recirculation fan 5 is respectively communicated with the flue gas outlet 22, and the air outlet of each flue gas recirculation fan 5 is respectively communicated with the combustion chamber 1, so that the flow of low-temperature flue gas fed into the combustion chamber 1 can be increased according to actual needs, meanwhile, the flow of low-temperature flue gas fed into the combustion chamber 1 can be adjusted within a larger flow range, and moreover, the boiler system can still convey the low-temperature flue gas to the combustion chamber 1 in a recirculation mode under the condition that one recirculation fan 5 is damaged, and the reliability of the system is improved; wherein, the number of the flue gas recirculation fans 5 can be two, three or more according to the size of the boiler, the power of the flue gas recirculation fans 5 and the like.
In order to make the distribution of the low-temperature flue gas entering the combustion chamber 1 more uniform, the combustion chamber 1 may be provided with at least two flue gas recirculation inlets, one flue gas recirculation inlet corresponding to one flue gas recirculation fan 5, and the at least two flue gas recirculation inlets are located on different sides of the combustion chamber 1.
Wherein the number of flue gas recirculation inlets corresponds to the number of flue gas recirculation fans 5, for example, when there are two flue gas recirculation fans 5, there are also two flue gas recirculation inlets; the specific realization that the at least two flue gas recirculation inlets are located on different sides of the combustion chamber 1 may be that the at least two flue gas recirculation inlets are equally spaced along the circumference of the combustion chamber 1; or at least two flue gas recirculation inlets are distributed along the circumferential direction of the combustion chamber 1 at unequal intervals; the arrangement of at least two flue gas recirculation inlets can be arranged according to actual needs, requirements of installation space and the like, and details are omitted here.
During the concrete realization, the low temperature flue gas of two at least flue gas recirculation fan 5 extractions can follow in the combustion chamber 1 is got into respectively to the difference side to can make the distribution that gets into the low temperature flue gas in the combustion chamber 1 more even, and then can accelerate the cooling process of combustion chamber 1, better prevent that combustion chamber 1 from overtemperature.
In other embodiments, the at least two flue gas recirculation inlets may also be located on the same side of the combustion chamber 1 according to actual needs and installation space requirements, and specifically, the at least two flue gas recirculation inlets may be located at the same height on the same side of the combustion chamber 1, or may be located at different heights on the same side of the combustion chamber 1.
Further, in order to be able to control the flow to each flue gas recirculation fan 5 in the combustion chamber 1, at least two regulating valves 6 may be provided, one regulating valve 6 for each flue gas recirculation fan 5.
Wherein the number of regulating valves 6 corresponds to the number of flue gas recirculation fans 5, for example, when there are two flue gas recirculation fans 5, there are also two regulating valves 6.
In specific implementation, the opening degrees of the valve ports of at least two regulating valves 6 can be regulated to be the same; the opening degree of one or more valve ports of the regulating valve 6 can be adjusted to be larger, and the opening degree of another or more valve ports of the regulating valve 6 can be adjusted to be smaller according to requirements; it is also possible to open only one or several of the regulating valves 6 and close another one or several of the regulating valves 6; in practical application, the operator can also make combined adjustment according to actual requirements, and is not limited to the above three possible implementation manners.
In particular, the heat exchange structure 3 may comprise a superheater, the tubes of which are formed as at least part of the heat exchange tubes 31, the superheater being arranged in the flue 2 between the flue gas inlet 21 and the economizer 4.
The heat exchange structure 3 may further include a tube air-cooled wall (not shown in the drawings) formed as a heat exchange tube and disposed on an inner wall of the combustion chamber 1.
The tubular air-cooled wall and the superheater are communicated and form a heat exchange tube 31 of the heat exchange structure 3 together, the carbon dioxide inlet 311 can be arranged on the tubular air-cooled wall, and the carbon dioxide outlet 312 can be arranged on the superheater, so that low-temperature carbon dioxide can be introduced into the tubular air-cooled wall and the superheater to exchange heat between the low-temperature carbon dioxide and high-temperature flue gas.
Specifically, the tubular air-cooling wall may be disposed along the circumferential direction of the inner wall of the flue, for example, the tubular air-cooling wall may be disposed around the circumferential direction of the inner wall of the flue, and may be disposed around the inner wall of the flue by one turn, two turns, or more turns according to actual needs.
In other embodiments, the tubular air-cooled wall may be disposed on the inner wall of the flue, and will not be described herein.
In order to further avoid harmful substance such as nitrogen oxide in the flue gas to discharge to the atmosphere to cause the pollution to the atmospheric environment, can set up flue gas processing apparatus (not shown in the figure) in exhanst gas outlet department, thereby make the flue gas that discharges from exhanst gas outlet 22 department just can discharge to the atmosphere after handling up to standard through flue gas processing apparatus at first, thereby can protect atmospheric environment.
Specifically, the connection between the air inlet of the flue gas recirculation fan 5 and the flue 2 may be located between the economizer 4 and the flue gas treatment device, so that the flue gas recirculation fan can extract the low-temperature flue gas passing through the economizer 4 and send the low-temperature flue gas into the combustion chamber 1.
In other embodiments, the connection between the air inlet of the flue gas recirculation fan and the flue may also be located downstream of the flue gas treatment device.
The utility model discloses a boiler system, which comprises a boiler, wherein the boiler comprises a combustion chamber 1, a flue 2, a heat exchange structure 3 and a coal economizer 4 capable of recovering heat; the flue 2 is provided with a flue gas inlet 21 and a flue gas outlet 22, the flue gas inlet 21 is communicated with the combustion chamber 1, so that flue gas generated after fuel and air in the combustion chamber 1 are combusted can enter the flue 2 through the flue gas inlet 21; by arranging at least part of the heat exchange structure 3 and the economizer 4 in the flue and positioning at least part of the heat exchange structure 3 between the flue gas inlet 21 and the economizer 4, high-temperature flue gas entering from the flue gas inlet 21 can firstly pass through at least part of the heat exchange structure 3 and transfer part of heat to the heat exchange structure 3 to become medium-temperature flue gas, the medium-temperature flue gas passes through the economizer 4 and is recycled by the economizer 4 to become low-temperature flue gas, and the low-temperature flue gas is discharged from the flue gas outlet 22; meanwhile, the heat exchange structure 3 is arranged to be a structure comprising a heat exchange tube 31, the heat exchange tube 31 is provided with a carbon dioxide inlet 311 and a carbon dioxide outlet 312, the carbon dioxide inlet 311 is communicated with a heat regenerator 7 for providing low-temperature carbon dioxide, so that high-temperature flue gas generated in the combustion chamber 1 and low-temperature carbon dioxide entering the heat exchange tube 31 can exchange heat through the tube wall of the heat exchange tube 31 to transfer heat of the high-temperature flue gas to the low-temperature carbon dioxide, the low-temperature carbon dioxide is converted into high-temperature carbon dioxide and is discharged from the carbon dioxide outlet, the carbon dioxide outlet 312 is connected with the turbine 8, so that the high-temperature carbon dioxide discharged from the carbon dioxide outlet 312 can enter the turbine 8 to expand to do work and drive the turbine 8 to operate, and therefore; in addition, through setting up the recirculation fan 5 of the flue gas and the damper valve 6 on the boiler, the air intake of the recirculation fan 5 of the flue gas communicates with exit 22 of the flue gas, the air outlet of the recirculation fan 5 of the flue gas communicates with combustion chamber 1, the recirculation fan 5 of the flue gas is used for sending at least some flue gases discharged from exit 22 of the flue gas into combustion chamber 1, on the one hand, because the temperature of the flue gas of exit is lower, can reduce the temperature in the combustion chamber after sending into the combustion chamber, thus can prevent the combustion chamber from overtemperature, and then guarantee the normal safe operation of the boiler, on the other hand, send into the injection amount of the air in the combustion chamber, also reduced the oxygen content entering the combustion chamber, thus not only can inhibit burning in order to reduce the temperature of the high-temperature flue gas that burns, prevent the combustion chamber from overtemperature, and can inhibit the production, reducing the emission of nitrogen oxides to protect the atmospheric environment; in addition, the regulating valve can be used for controlling the flow of the flue gas sent into the combustion chamber, so that the temperature change regulation of the outlet temperature of the boiler working medium can be realized by controlling the flow of the flue gas sent into the combustion chamber.
In the description of the present invention, it is to be understood that the terms "top," "bottom," "upper," "lower" (if present), and the like, are used in the orientation or positional relationship shown in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The terms "first" and "second" in the description and claims of the present application and the description of the above-described figures are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A boiler system is characterized by comprising a boiler, wherein the boiler comprises a combustion chamber, a flue, a heat exchange structure and an economizer capable of recovering heat;
the flue is provided with a flue gas inlet and a flue gas outlet, and the flue gas inlet is communicated with the combustion chamber;
at least part of the heat exchange structure and the coal economizer are arranged in the flue, and at least part of the heat exchange structure is positioned between the flue gas inlet and the coal economizer, so that the flue gas entering from the flue gas inlet sequentially passes through at least part of the heat exchange structure and the coal economizer and is discharged from the flue gas outlet; wherein the temperature of the flue gas exiting the flue gas outlet is lower than the temperature of the flue gas entering from the flue gas inlet;
the heat exchange structure comprises a heat exchange tube, the heat exchange tube is provided with a carbon dioxide inlet and a carbon dioxide outlet, flue gas generated in the combustion chamber can exchange heat with carbon dioxide entering the heat exchange tube through the tube wall of the heat exchange tube, the carbon dioxide inlet is communicated with a heat regenerator for providing carbon dioxide, and the carbon dioxide outlet is connected with a turbine so that the carbon dioxide enters the turbine to expand and do work; wherein the temperature of the carbon dioxide exiting the carbon dioxide outlet is higher than the temperature of the carbon dioxide entering from the carbon dioxide inlet;
the boiler still includes flue gas recirculation fan and governing valve, flue gas recirculation fan's air intake with the exhanst gas outlet intercommunication, flue gas recirculation fan's air outlet with the combustion chamber intercommunication, flue gas recirculation fan is used for following exhanst gas outlet exhaust at least partial flue gas is sent into the combustion chamber, the governing valve is used for the control to be sent into the flow of the flue gas in the combustion chamber.
2. The boiler system according to claim 1, wherein the regulating valve is disposed at an air inlet of the flue gas recirculation fan.
3. The boiler system according to claim 1, wherein the regulating valve is disposed at an air outlet of the flue gas recirculation fan.
4. The boiler system of claim 1, wherein the flue gas recirculation fans are at least two;
and the air inlet of each smoke recirculation fan is respectively communicated with the smoke outlet, and the air outlet of each smoke recirculation fan is respectively communicated with the combustion chamber.
5. The boiler system according to claim 4, wherein the combustion chamber has at least two flue gas recirculation inlets, one corresponding to each flue gas recirculation fan, and at least two of the flue gas recirculation inlets are located on different sides of the combustion chamber.
6. The boiler system according to claim 4, wherein there are at least two of said regulating valves, one for each of said flue gas recirculation fans.
7. The boiler system according to claim 1, wherein the heat exchange structure comprises a superheater having a tube formed as at least a part of the heat exchange tube, the superheater being disposed in the flue between the flue gas inlet and the economizer;
the heat exchange structure further includes a tubular air-cooled wall formed as the heat exchange tube, the tubular air-cooled wall being disposed on an inner wall of the combustion chamber.
8. The boiler system according to claim 7, wherein the tubular air-cooled wall is circumferentially disposed along an inner wall of the flue.
9. The boiler system according to any of claims 1 to 7, wherein a flue gas treatment device is further provided at the flue gas outlet.
10. The boiler system of claim 9, wherein a communication of the air inlet of the flue gas recirculation fan and the flue is located between the economizer and the flue gas treatment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922266827.8U CN211502850U (en) | 2019-12-17 | 2019-12-17 | Boiler system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922266827.8U CN211502850U (en) | 2019-12-17 | 2019-12-17 | Boiler system |
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| Publication Number | Publication Date |
|---|---|
| CN211502850U true CN211502850U (en) | 2020-09-15 |
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| CN201922266827.8U Active CN211502850U (en) | 2019-12-17 | 2019-12-17 | Boiler system |
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