CN204006062U - Be applicable to the complex phase-change heat exchanger of fired power generating unit - Google Patents
Be applicable to the complex phase-change heat exchanger of fired power generating unit Download PDFInfo
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- CN204006062U CN204006062U CN201420307498.1U CN201420307498U CN204006062U CN 204006062 U CN204006062 U CN 204006062U CN 201420307498 U CN201420307498 U CN 201420307498U CN 204006062 U CN204006062 U CN 204006062U
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- low temperature
- temperature
- epimere
- high temperature
- hypomere
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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
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Abstract
The complex phase-change heat exchanger that is applicable to fired power generating unit in a kind of feed-water heater field, high temperature section and low temperature hypomere are set in turn in flue along flow of flue gas direction, the upper end of jet chimney is connected with the upper end of low temperature epimere, the lower end of jet chimney is connected with the upper end of low temperature hypomere, the lower end of solidifying waterpipe is connected with the lower end of low temperature hypomere, the upper end of solidifying waterpipe is connected with the lower end of low temperature epimere, the arrival end of medium to be heated is the arrival end of low temperature epimere, the port of export of medium to be heated is the port of export of high temperature section, the medium to be heated of low temperature epimere is in charge of the port of export and is connected with the arrival end of high temperature section, the medium to be heated of low temperature epimere is in charge of entrance point and is directly connected and is defined as one-level bypass with the outlet of high temperature section, the arrival end of high temperature section is directly connected and is defined as secondary bypass with outlet, control system respectively with low temperature epimere, secondary bypass, high temperature section is connected with low temperature hypomere.The utility model is guaranteeing, on the basis of system security of operation, effectively to have improved the outlet temperature of medium to be heated.
Description
Technical field
The utility model relates to the device in a kind of feed-water heater field, specifically a kind of complex phase-change heat exchanger that is applicable to fired power generating unit.
Background technology
The runnability of Industrial Boiler can decline gradually along with the increase of service time, and day by day in short supply along with conventional energy resource take that to improve the reducing energy consumption demand that existing industrial boiler operation efficiency is object urgent.For the comparatively common way of generating set, be to adopt flue gas waste heat recovery apparatus to absorb the heat of flue gas, then transfer heat to unit condensate water, improve and enter the condensing water temperature of low-temperature heater, thereby reach saving extracted steam from turbine, improve the object of generating set operational efficiency.In this waste heat recovery transformation, the final temperature of healed water is relevant with the capacity usage ratio of whole reducing energy consumption, as a rule, the outlet temperature that is heated working medium is higher, the capacity usage ratio of side waste heat recovery transformation is higher, so flue gas waste heat recovery reducing energy consumption has higher requirement to being heated the outlet temperature of working medium.
Existing complex phase-change heat exchanger can effectively reclaim fume afterheat, but owing to having adopted the working method of secondary heat exchange, its outlet temperature that is heated working medium is generally lower, double wall temperature composite phase change heat exchanger can address this problem, but can cause the heat exchange area of heat exchanger excessive, not be applicable to all occasions.
In sum, prior art is when facing specific operation, can only select to reduce the outlet temperature design load of healed water, this can cause the capacity usage ratio of whole residual neat recovering system lower, meanwhile, if adopt comparatively radical design, the design load of outlet water temperature is improved, can increase equipment cost, or reduce the safety in operation of residual neat recovering system.Obviously, such method for designing and the actual running results are not desirable situations from UTILIZATION OF VESIDUAL HEAT IN.
Along with Present Global energy shortage with to the requirement reducing discharging, the capacity usage ratio that improves flue gas waste heat recovery reducing energy consumption has become the technical barrier of being eager solution.
Through the retrieval of prior art is found, Chinese patent literature CN201903045, open day 2011.07.20, has recorded a kind of residual-heat utilization.This residual-heat utilization comprises control system, internally piloted valve, economizer, compound carbonated drink section, air preheater, phase-change heat-exchanger hypomere, phase-change heat-exchanger epimere, wall temperature tester and newly-increased acid dew-point temperature on-line monitoring equipment.The acid dew-point temperature on-line monitoring equipment of the utility model residual-heat utilization can dynamically be monitored sour dew-point temperature, and feeding back in real time control system, the confluent that control system changes boiler according to the variation of acid dew-point temperature is to reach the effect of real-time control wall temperature.But this technology cannot be applicable to the operating mode that inflow temperature is lower, because compound carbonated drink section is flue gas and gives water direct heat-exchange, so wall surface temperature will reveal between the hazardous area of corroding in there is acid when inflow temperature is lower, and then affect the normal operation of equipment.
Utility model content
The utility model is for prior art above shortcomings, a kind of complex phase-change heat exchanger that is applicable to fired power generating unit is provided, by low-temperature zone epimere, first the water of lower temperature is heated above to the safe temperature of acid dew point, and then passed into high temperature section, the outlet temperature that improves as much as possible medium to be heated in the situation that guaranteeing effectively to reduce exhaust gas temperature, has solved the low problem of existing waste-heat recovery device capacity usage ratio.
The utility model is achieved through the following technical solutions, comprise: high temperature section, low temperature hypomere, low temperature epimere, jet chimney, solidifying waterpipe and control system, wherein: high temperature section and low temperature hypomere are set in turn in flue along flow of flue gas direction, the upper end of jet chimney is connected with the upper end of low temperature epimere, the lower end of jet chimney is connected with the upper end of low temperature hypomere, the lower end of solidifying waterpipe is connected with the lower end of low temperature hypomere, the upper end of solidifying waterpipe is connected with the lower end of low temperature epimere, the arrival end of medium to be heated is the arrival end of low temperature epimere, the port of export of medium to be heated is the port of export of high temperature section, the medium to be heated of low temperature epimere is in charge of the port of export and is connected with the arrival end of high temperature section, the medium to be heated of low temperature epimere is in charge of entrance point and is directly connected and is defined as one-level bypass with the outlet of high temperature section, the arrival end of high temperature section is directly connected and is defined as secondary bypass with outlet, control system respectively with low temperature epimere, secondary bypass, high temperature section is connected with low temperature hypomere.
Described high temperature section comprises: be arranged at the influent header of arrival end, the outlet header that is arranged at the port of export and pipe row, wherein: one end of pipe row is connected with influent header, and the other end is connected with outlet header.
Described pipe is classified coiled pipe row as, comprises finned tube and connecting bend side by side.
Described low temperature hypomere comprises: upper header, lower collecting box and pipe row, wherein: pipe row's upper end is connected with upper header, pipe row's lower end is connected with lower collecting box.
Described low temperature epimere is shell-and-tube heat exchanger.
Described control system comprises: low temperature control valve, high temperature adjustable valve, high-temperature temperature measuring point and cryogenic temperature measuring point, wherein: low temperature control valve is arranged at the arrival end of low temperature epimere, high temperature adjustable valve is arranged in secondary bypass, high-temperature temperature measuring point is arranged at the inside of pipe row, and cryogenic temperature measuring point is arranged at pipe row's inside.
The utility model is guaranteeing, on the basis of system security of operation, effectively to have improved the outlet temperature that is heated working medium, thereby has improved the actual benefit of flue gas waste heat recovery transformation, for residual heat from boiler fume reclaims transformation, provides reliable technical guarantee.
The utility model has solved existing flue gas waste heat recovery technology cannot need the problem of level by the final outlet temperature increase that is heated working medium to design, in the situation that Gas Parameters is identical, the outlet temperature that can make to be heated working medium than conventional flue gas waste heat recovery technology high 15 ℃～25 ℃.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
The specific embodiment
Below embodiment of the present utility model is elaborated; the present embodiment is implemented take technical solutions of the utility model under prerequisite; provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the present embodiment comprises: high temperature section 2, low temperature hypomere 6, low temperature epimere 7, jet chimney 8, solidifying waterpipe 10 and control system 13, wherein: high temperature section 2 and low temperature hypomere 6 are set in turn in flue 1 along flow of flue gas direction, the upper end of jet chimney 8 is connected with the upper end of low temperature epimere 7, the lower end of jet chimney 8 is connected with the upper end of low temperature hypomere 6, the lower end of solidifying waterpipe 10 is connected with the lower end of low temperature hypomere 6, the upper end of solidifying waterpipe 10 is connected with the lower end of low temperature epimere 7, the arrival end of medium to be heated is the arrival end of low temperature epimere 7, the port of export of medium to be heated is the port of export of high temperature section 2, the medium to be heated of low temperature epimere 7 is in charge of the port of export and is connected with the arrival end of high temperature section 2, the medium to be heated of low temperature epimere 7 is in charge of entrance point and is directly connected with the outlet of high temperature section 2 and is defined as one-level bypass I, the arrival end of high temperature section 2 is directly connected and is defined as secondary bypass II with outlet, control system 13 respectively with low temperature epimere 7, secondary bypass II, high temperature section 2 is connected with low temperature hypomere 6.
Described high temperature section 2 comprises: be arranged at the influent header 3 of arrival end, the outlet header 4 that is arranged at the port of export and pipe row 5, wherein: one end of pipe row 5 is connected with influent header 3, and the other end is connected with outlet header 4.
Described pipe row 5, for coiled pipe row, are comprised of some finned tube and connecting bends side by side.
Described low temperature hypomere 6 comprises: upper header 9, lower collecting box 11 and pipe row 12, wherein: pipe row 12 upper end is connected with upper header 9, pipe row 12 lower end is connected with lower collecting box 11.
Described low temperature epimere 7 is shell-and-tube heat exchanger.
Described control system 13 comprises: low temperature control valve 14, high temperature adjustable valve 15, high-temperature temperature measuring point 16 and cryogenic temperature measuring point 17, wherein: low temperature control valve 14 is arranged at the arrival end of low temperature epimere 7, high temperature adjustable valve 15 is arranged in secondary bypass, high-temperature temperature measuring point 16 is arranged at the inside of pipe row 5, for measuring the temperature of medium to be heated.Cryogenic temperature measuring point 17 is arranged at pipe row 12 inside, for measuring the temperature of medium to be heated.
In this device: the flue gas of higher temperature is first reduced to after lower temperature through after high temperature section 2 and media for heat exchange to be heated, then carries out heat exchange through low temperature hypomere 6 and circulatory mediator, discharge after being reduced to lower temperature.
In this device: be heated working medium and enter low temperature epimere 7 and carry out being elevated to after uniform temperature after heat exchange with circulatory mediator after low temperature control valve 14, enter high temperature section 2 and carry out being elevated to final temperature after heat exchange with flue gas.On medium main pipe rail to be heated, be provided with on one-level bypass I and one-level bypass I and be provided with stop valve, simultaneously at the side medium to be heated of high temperature section 2, be provided with on secondary bypass II and secondary bypass II and be provided with high temperature adjustable valve 15.
In this device: contain certain circulatory mediator (being generally demineralized water) in low temperature hypomere 6, circulatory mediator in low temperature hypomere 6 is heated rear vaporization and forms steam and after jet chimney 8, enter low temperature epimere 7 and carry out heat exchange with medium to be heated, after after heat release, water vapor condensation liquefies, through solidifying waterpipe 10, be back to low temperature hypomere 6, form circulation.
In the present embodiment acid dew point be 85 ℃, temperature be the flue gas of 160 ℃ enter in high temperature section 2 and with the outer surface of coiled pipe pipe row 5, directly contact and be heated working medium heat exchange after temperature be reduced to 140 ℃, after this flue gas of 140 ℃ enter low temperature hypomere 6 and directly contact with finned tube pipe row 12 outer surface and circulatory mediator heat exchange after be further reduced to 110 ℃;
Circulatory mediator is stored in the finned tube pipe row 12 of low temperature hypomere 6, by the circulatory mediator after flue gas, formed the steam of 95 ℃, steam enters the shell side of low temperature epimere 7 and is condensed into the solidifying water of 95 ℃ with being heated after working medium forms heat exchange through low temperature hypomere upper header 9 and jet chimney 8 successively, solidifying water is got back in the finned tube pipe row 12 in low temperature hypomere 6 and is formed closed circuit through solidifying waterpipe 10 and low temperature hypomere lower collecting box 11 successively, and circulatory mediator repeatedly changes between steam and two kinds of phases of solidifying water;
Temperature is that tube side and the circulatory mediator that working medium enters low temperature epimere 7 through house steward that be heated of 52 ℃ carries out heat exchange, (this temperature is higher than the acid dew-point temperature of flue gas to be heated to 90 ℃, can guarantee security of operation and the service life of high temperature section 2), then the working medium that is heated of 90 ℃ enters coiled pipe pipe row 5 inside of high temperature section 2 and carries out being heated to after 115 ℃ after heat exchange with flue gas, through house steward, exports outflow.High temperature section temperature point 16 and low-temperature zone temperature point 17 are arranged be heated 92 ℃ of Temperature of Working signals (under nominal situation being 90～100 ℃) and the finned tube pipe of coiled pipe pipe row 5 interior measuring points the medium temperature signal to be heated 95 ℃ (under nominal situation being 92～98 ℃) of 12 interior measuring points and are sent to low temperature control valve 14 and high temperature adjustable valve 15 respectively, because system in the present embodiment is in normal operating condition, without regulating low temperature control valve 14 and high temperature adjustable valve 15, if measured temperature signal is in exceptional value, can regulate according to the contrast situation of signal and canonical parameter the aperture of low temperature control valve 14 and high temperature adjustable valve 15, thereby rationally control and be heated the flow that working medium enters low temperature epimere 7 and high temperature section 2, make be heated Temperature of Working and the finned tube pipe of coiled pipe pipe row 5 interior measuring points arrange the circulatory mediator temperature of 12 interior measuring points and get back to normal range (NR).
Thus, the present embodiment makes high temperature section 2 inner sides be heated Temperature of Working and remains at 92 ℃ of left and right, makes the circulatory mediator temperature of low temperature hypomere 6 inner sides remain at 95 ℃ of left and right.The complex phase-change heat exchanger outlet temperature that is now applicable to fired power generating unit is generally 110 ℃ of left and right, exhaust gas temperature is only higher than 25 ℃ of flue gas acid dew points, the outlet temperature that is simultaneously heated working medium reaches 115 ℃, and higher than final exhaust gas temperature, equipment performance is apparently higher than similar technology.
Claims (6)
1. a complex phase-change heat exchanger that is applicable to fired power generating unit, it is characterized in that, comprise: high temperature section, low temperature hypomere, low temperature epimere, jet chimney, solidifying waterpipe and control system, wherein: high temperature section and low temperature hypomere are set in turn in flue along flow of flue gas direction, the upper end of jet chimney is connected with the upper end of low temperature epimere, the lower end of jet chimney is connected with the upper end of low temperature hypomere, the lower end of solidifying waterpipe is connected with the lower end of low temperature hypomere, the upper end of solidifying waterpipe is connected with the lower end of low temperature epimere, the arrival end of medium to be heated is the arrival end of low temperature epimere, the port of export of medium to be heated is the port of export of high temperature section, the medium to be heated of low temperature epimere is in charge of the port of export and is connected with the arrival end of high temperature section, the medium to be heated of low temperature epimere is in charge of entrance point and is directly connected and is defined as one-level bypass with the outlet of high temperature section, the arrival end of high temperature section is directly connected and is defined as secondary bypass with outlet, control system respectively with low temperature epimere, secondary bypass, high temperature section is connected with low temperature hypomere.
2. the complex phase-change heat exchanger that is applicable to fired power generating unit according to claim 1, it is characterized in that, described high temperature section comprises: be arranged at the influent header of arrival end, the outlet header that is arranged at the port of export and pipe row, wherein: one end of pipe row is connected with influent header, and the other end is connected with outlet header.
3. the complex phase-change heat exchanger that is applicable to fired power generating unit according to claim 1 and 2, is characterized in that, described pipe is classified coiled pipe row as, comprises finned tube and connecting bend side by side.
4. the complex phase-change heat exchanger that is applicable to fired power generating unit according to claim 3, is characterized in that, described low temperature hypomere comprises: upper header, lower collecting box and pipe row, wherein: pipe row's upper end is connected with upper header, pipe row's lower end is connected with lower collecting box.
5. the complex phase-change heat exchanger that is applicable to fired power generating unit according to claim 3, is characterized in that, described low temperature epimere is shell-and-tube heat exchanger.
6. the complex phase-change heat exchanger that is applicable to fired power generating unit according to claim 1, it is characterized in that, described control system comprises: low temperature control valve, high temperature adjustable valve, high-temperature temperature measuring point and cryogenic temperature measuring point, wherein: low temperature control valve is arranged at the arrival end of low temperature epimere, high temperature adjustable valve is arranged in secondary bypass, high-temperature temperature measuring point is arranged at the inside of pipe row, and cryogenic temperature measuring point is arranged at pipe row's inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307498.1U CN204006062U (en) | 2014-06-11 | 2014-06-11 | Be applicable to the complex phase-change heat exchanger of fired power generating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307498.1U CN204006062U (en) | 2014-06-11 | 2014-06-11 | Be applicable to the complex phase-change heat exchanger of fired power generating unit |
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| Publication Number | Publication Date |
|---|---|
| CN204006062U true CN204006062U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420307498.1U Expired - Fee Related CN204006062U (en) | 2014-06-11 | 2014-06-11 | Be applicable to the complex phase-change heat exchanger of fired power generating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204006062U (en) |
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2014
- 2014-06-11 CN CN201420307498.1U patent/CN204006062U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20200611 |