CN214745984U - Heating system with secondary low-temperature economizer - Google Patents
Heating system with secondary low-temperature economizer Download PDFInfo
- Publication number
- CN214745984U CN214745984U CN202121156564.6U CN202121156564U CN214745984U CN 214745984 U CN214745984 U CN 214745984U CN 202121156564 U CN202121156564 U CN 202121156564U CN 214745984 U CN214745984 U CN 214745984U
- Authority
- CN
- China
- Prior art keywords
- low
- water
- water outlet
- temperature economizer
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The utility model relates to the technical field of heating systems, in particular to a heating system with a secondary low-temperature economizer, which is provided with a flue, a flue heat absorption system is arranged in the flue, a condensed water pipeline system and a primary heat supply network system are arranged outside the flue, and the heating system is characterized in that the flue heat absorption system comprises a primary low-temperature economizer, an electric dust remover, an induced draft fan, a secondary low-temperature economizer and a desulfurization absorption tower, a water inlet and a water outlet of the primary low-temperature economizer are respectively communicated with the primary heat supply network system, a water inlet of the secondary low-temperature economizer is respectively connected with the condensed water pipeline system through a water inlet main pipe and a water outlet main pipe, a circulating water guide pipe is arranged between the water inlet main pipe and the water outlet main pipe, two ends of the circulating water guide pipe are respectively communicated with the water inlet main pipe and the water outlet main pipe, and a circulating pump and a control valve C are arranged on the circulating water guide pipe, the energy-saving device has the advantages of simple structure, less heat loss, high heat utilization, flexible operation mode, good energy-saving effect and the like.
Description
Technical Field
The utility model belongs to the technical field of heating system technique and specifically relates to a simple structure, calorific loss is few, the heat utilizes high, the operation mode is nimble, energy-conserving effectual heating system of taking second grade low temperature economizer.
Background
It is known that besides the loss of the cold end in the thermal power plant, the loss of the exhaust smoke is the second largest heat loss in the operation of the unit, and accounts for about 6%. However, due to design and installation, the exhaust gas temperature of most of the boilers in thermal power plants often exceeds the design value, and some of the exhaust gas temperatures are as high as 30 ℃. The higher exhaust gas temperature makes boiler exhaust gas heat loss increase to more than 7%, and smoke and dust specific resistance risees moreover, and the flue gas volume increases, causes boiler thermal efficiency to reduce, and dust collection efficiency reduces, and desulfurization efficiency reduces. Therefore, the potential of the existing thermodynamic system can be excavated by reducing the exhaust gas temperature of the boiler, the exhaust gas waste heat of the boiler can be fully utilized, the dust removal efficiency and the desulfurization efficiency can be improved, and conditions are created for ultralow emission.
At present, the main measure for reducing the temperature of the exhaust smoke is to install a low-temperature economizer in a flue, heat the condensed water by utilizing the high-temperature exhaust smoke of a boiler, and reduce the temperature of the exhaust smoke from 140 ℃ to about 100-110 ℃. The condensed water absorbs the heat of the discharged smoke in the flue, reduces the temperature of the discharged smoke, is heated and raised in temperature and then returns to the low-pressure heater system of the steam turbine to exhaust and extract steam, so that high-level steam of the unit is saved, and the low-temperature economizer is arranged at the inlet of the electric dust remover, so that the power supply coal consumption rate can be reduced by 1.5gce/kWh (1.5 g of standard coal/kilowatt hour). And after the low-temperature economizer is installed, the dust removal efficiency is improved by at least 0.5 percent.
With the rapid development of new energy resources such as wind power, photovoltaic and nuclear power, the living space of a thermal power plant is extruded, and currently, 300MW active thermal power generating units in China are basically transformed for heat supply, so that cogeneration is realized, and heat is supplied to the outside. The main method for supplying heat to the outside is to heat the primary heat supply network water supply by a heat supply network heater from steam extraction of a steam turbine (such as a communicating pipe from a medium pressure cylinder to a low pressure cylinder or four-section steam extraction or auxiliary steam), and the power supply coal consumption rate can be reduced by 10 gce/kWh.
The existing low-temperature economizer generally heats condensed water, and because the temperature of a flue inlet is very high, the waste heat cannot be fully utilized due to the fact that the condensed water is heated by the high-temperature flue gas.
Disclosure of Invention
The utility model aims at solving the deficiencies of the prior art, providing a heating system of taking second grade low temperature economizer that simple structure, calorific loss are few, the heat utilizes height, operation mode is nimble, energy-conserving effectual.
The utility model provides a technical scheme that its technical problem adopted is:
a heating system with a secondary low-temperature economizer is provided with a flue, a flue heat absorption system is arranged in the flue, a condensed water pipeline system and a primary heat supply network heating system are arranged outside the flue, the condensed water pipeline system comprises a primary heat supply network heater, a primary heat supply network pipeline and a primary heat supply network heat return pipeline, the primary heat supply network heat supply pipeline and the primary heat supply network heat return pipeline are respectively connected with the primary heat supply network heater, the condensed water pipeline system comprises a fifth low-pressure heater, a sixth low-pressure heater, a seventh low-pressure heater and a condensed water conveying pipeline, the condensed water conveying pipeline is sequentially provided with a seventh low-pressure heater, a sixth low-pressure heater and a fifth low-pressure heater, and the heating system is characterized in that the flue heat absorption system comprises a primary low-temperature economizer, an electric precipitator, an induced draft fan, a secondary low-temperature economizer and a desulfurization absorption tower. The first-stage low-temperature economizer, the electric dust remover, the induced draft fan, the second-stage low-temperature economizer and the desulfurization absorption tower are sequentially connected in a flue, a water inlet of the first-stage low-temperature economizer is communicated with a first-stage heat network heat regeneration pipeline through a hot water inlet pipe, a water outlet of the first-stage low-temperature economizer is communicated with a first-stage heat network heat supply pipeline through a hot water outlet pipe, a control valve A and a control valve B are respectively arranged on the hot water inlet pipe and the hot water outlet pipe, a water inlet of the second-stage low-temperature economizer is connected with a water outlet of the seventh low-pressure heater through a water inlet main pipe, a water outlet of the second-stage low-temperature economizer is respectively connected with water inlet ends of the first water outlet pipe and the second water outlet pipe through a water outlet main pipe and a three-way pipe, a water outlet end of the first water outlet pipe is communicated with a water outlet of the sixth low-pressure heater, a water outlet end of the second water outlet pipe is communicated with a water inlet of the sixth low-pressure heater, the water inlet main pipe and the water outlet main pipe are provided with circulating water guide pipes, two ends of each circulating water guide pipe are respectively communicated with the water inlet main pipe and the water outlet main pipe, each circulating water guide pipe is provided with a circulating pump and a control valve C, and the first water outlet pipe and the second water outlet pipe are respectively provided with a control valve D and a control valve E.
The condensed water conveying pipeline between the second water outlet pipe and the water inlet main pipe is provided with a control valve F.
The diameter of circulation aqueduct be less than inlet manifold and outlet manifold's diameter, the water that circulation aqueduct made in inlet manifold and the outlet manifold circulates, to the water heating in the inlet manifold, prevent that the low temperature that causes low temperature corrosion to second grade low temperature economizer of condensation water temperature.
The one-level heat supply network heater is used for heat exchange steam supply by steam extraction of a steam turbine.
One-level heat supply network heat supply pipeline on be equipped with heat supply valve G, be equipped with back heat valve H on the one-level heat supply network back heat pipeline.
The water inlet main pipe of the second-stage low-temperature economizer is provided with a control valve I for controlling the water inlet amount on the water inlet main pipe.
The utility model discloses owing to adopt above-mentioned structure, have simple structure, calorific loss is few, the heat utilizes high, the operation mode is nimble, energy-conserving advantage such as effectual.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in the attached drawing, the heat supply system with the secondary low-temperature economizer is provided with a flue, a flue heat absorption system is arranged in the flue, a condensed water pipeline system and a primary heat supply network heat supply system are arranged outside the flue, the condensed water pipeline system comprises a primary heat supply network heater 1, a primary heat supply network heat supply pipeline 2 and a primary heat supply network heat return pipeline 3, the primary heat supply network heat supply pipeline 2 and the primary heat supply network heat return pipeline 3 are respectively connected with the primary heat supply network heater 1, the condensed water pipeline system comprises a fifth low-pressure heater 4, a sixth low-pressure heater 5, a seventh low-pressure heater 6 and a condensed water conveying pipeline 7, the seventh low-pressure heater 6, the sixth low-pressure heater 5 and the fifth low-pressure heater 4 are sequentially arranged on the condensed water conveying pipeline 7, and the heat supply system is characterized in that the flue heat absorption system comprises a primary low-temperature economizer 8, a sixth low-pressure heater 5, a fifth low-pressure heater 4, and an electric dust remover 9 An induced draft fan 10, a second-stage low-temperature economizer 11 and a desulfurization absorption tower 12, wherein the first-stage low-temperature economizer 8, an electric dust remover 9, the induced draft fan 10, the second-stage low-temperature economizer 11 and the desulfurization absorption tower 12 are sequentially connected in a flue, a water inlet of the first-stage low-temperature economizer 8 is communicated with a first-stage heat supply network heat return pipeline 3 through a hot water inlet pipe 13, a water outlet of the first-stage low-temperature economizer 8 is communicated with a first-stage heat supply network heat supply pipeline 2 through a hot water outlet pipe 14, the hot water inlet pipe 13 and the hot water outlet pipe 14 are respectively provided with a control valve A and a control valve B, a water inlet of the second-stage low-temperature economizer 11 is connected with a water outlet of a seventh low-pressure heater 6 through a water inlet header pipe 15, a water outlet of the second-stage low-temperature economizer 11 is respectively connected with water inlet ends of a first water outlet pipe 17 and a second water outlet pipe 18 through a water outlet header pipe 16 and a three-way pipe, a water outlet end of the first water outlet pipe 17 is communicated with a water outlet of a sixth low-pressure heater 5, the water outlet end of the second water outlet pipe 18 is communicated with the water inlet of the sixth low-pressure heater 5, a circulating water guide pipe 19 is arranged between the water inlet main pipe 15 and the water outlet main pipe 16, two ends of the circulating water guide pipe 19 are respectively communicated with the water inlet main pipe 15 and the water outlet main pipe 16, a circulating pump 20 and a control valve C are arranged on the circulating water guide pipe 19, and a control valve D and a control valve E are respectively arranged on the first water outlet pipe 17 and the second water outlet pipe 18.
Furthermore, a control valve F is arranged on the condensed water conveying pipeline 7 between the second water outlet pipe 18 and the water inlet main pipe 15.
Further, the diameter of the circulating water guide pipe 19 is smaller than the diameters of the water inlet main pipe 15 and the water outlet main pipe 16, the circulating water guide pipe enables water in the water inlet main pipe 15 and the water outlet main pipe 16 to circulate, water in the water inlet main pipe 15 is heated, and low-temperature corrosion of the secondary low-temperature economizer 11 caused by low temperature of condensation water is prevented.
Further, the primary heating network heater 1 is used for heat exchange steam supply through steam extraction of a steam turbine.
Further, a heat supply valve G is arranged on the primary heat supply network heat supply pipeline 2, and a heat return valve H is arranged on the primary heat supply network heat return pipeline 3.
Furthermore, the water inlet main pipe 15 is provided with a control valve I for controlling the water inflow of the condensed water on the water inlet main pipe 15.
The utility model discloses when using, under the winter needs heat supply condition, because one-level low temperature economizer 8 is close to the flue entry, flue gas temperature reaches about 140 ℃, can open control valve A and control valve B this moment, and the heating return water part in the one-level heat supply network heating system is at one-level low temperature economizer 8 inner loop, heats the heating that realizes the heating return water through one-level low temperature economizer 8. At the moment, when the temperature of the outlet of the No. seven low-pressure heater 6 in the condensed water pipeline system is lower than 75 ℃, the circulating pump 20 and the control valve C are opened, part of water heated by the secondary low-temperature economizer 11 is circulated into the water inlet main pipe 15 and is mixed with water at the outlet of the No. seven low-pressure heater 6, so that the temperature in the water inlet main pipe 15 is further raised, and the secondary low-temperature economizer 11 is prevented from low-temperature corrosion to cause the leakage of the pipeline of the low-temperature economizer. In summer, under the condition of less heat supply load or no heat supply load, the control valve A and the control valve B are closed or properly closed, so that the heat absorbed by the primary low-temperature economizer 8 is less, the heat passing through the secondary low-temperature economizer 11 is greater, and at the moment, the control valve D is opened when the temperature of the condensed water heated by the secondary low-temperature economizer 11 reaches 100 ℃; when the temperature is lower than 100 ℃, the control valve E is opened to realize the reasonable utilization of the heat gradient.
In a conventional low-temperature economizer system, condensed water is connected in parallel from an inlet and an outlet of a No. seven low-pressure heater 6 through a water inlet electromagnetic valve and enters a low-temperature economizer for heating. The invention considers that under rated load, the temperature of condensed water at the inlet of the No. seven low-pressure heater 6 is only 50 ℃ (when the temperature of the condensed water is low in low load, the temperature of the condensed water is low), and the condensed water with low temperature is introduced into the second-stage low-temperature economizer 11, so that the second-stage low-temperature economizer 11 can be corroded at low temperature, and the pipeline leakage of the low-temperature economizer can be caused. Therefore, the invention omits the water inlet electromagnetic valve and the pipeline of the inlet of the No. seven low-pressure heater 6 and only reserves the water inlet electromagnetic valve and the pipeline of the outlet of the No. seven low-pressure heater 6, thereby greatly reducing the low-temperature corrosion of the low-temperature economizer. In order to thoroughly solve the problem of low-temperature corrosion of the secondary low-temperature economizer 11, the circulating water guide pipe 19, the circulating pump 20 and the control valve C are added, the control valve C is opened under the low-load working condition or in winter, when the water temperature at the outlet of the seventh low-pressure heater 6 is lower than 75 ℃, the control valve C is opened, hot water at the outlet of the secondary low-pressure economizer is led back to the outlet by the circulating pump 20, so that the water temperature at the inlet of the secondary low-pressure economizer reaches over 75 ℃, and low-temperature corrosion is prevented. In order to save energy, the circulating pump 20 adopts a frequency converter to control the rotating speed so as to adjust the flow rate of the hot water recirculation, and the primary low-temperature economizer 8 system and the secondary low-temperature economizer 11 system are physically independent from each other, so that once the primary low-temperature economizer 8 system exits from operation due to leakage of internal pipes, the operation of the secondary low-temperature economizer 11 system cannot be influenced, namely once the primary low-temperature economizer 8 system stops operating due to failure, the primary low-temperature economizer system can continue to operate. When the pipe of the first-stage low-temperature economizer 8 leaks, the operation mode can be switched to a single second-stage low-temperature economizer 11; when the pipe of the second-stage low-temperature economizer 11 leaks, the operation mode can be switched to the operation mode of the single first-stage low-temperature economizer 8, the two modes are not affected with each other, the operation mode is flexible, a first-stage low-temperature economizer is arranged at the inlet of the electric dust collector, and absorbs the waste heat of the discharged smoke during the heat supply period to replace part of steam extracted by a steam turbine, used for heating the return water of the primary heat supply network, the temperature of the discharged smoke can be reduced from 140 ℃ to about 100-110 ℃, at this time, the boiler efficiency can be improved by more than 1 percentage point, and a large amount of high-level steam extraction of high and medium pressure cylinders can be saved, and simultaneously, and a secondary low-temperature economizer is arranged at the inlet of the desulfurization absorption tower, and is used for further absorbing the recovered flue gas waste heat to heat condensed water during the non-heat supply period, so that the temperature of the flue gas is reduced from 100-110 ℃ to 85 ℃, the temperature of the flue gas at the inlet of the desulfurization tower is reduced, the flue gas reaches the optimal absorption temperature of the desulfurization absorption tower, and a large amount of low-pressure cylinder steam extraction is saved. The two-stage low-temperature economizer not only further improves the boiler efficiency and reduces the heat consumption rate of the steam turbine, but also can improve the desulfurization efficiency and the dust removal efficiency. Thereby realizing double effects of steam extraction and heat supply and a low-temperature economizer and achieving the effect of getting twice with half the effort.
Claims (5)
1. A heating system with a secondary low-temperature economizer is provided with a flue, a flue heat absorption system is arranged in the flue, a condensed water pipeline system and a primary heat supply network heating system are arranged outside the flue, the condensed water pipeline system comprises a primary heat supply network heater, a primary heat supply network pipeline and a primary heat supply network heat return pipeline, the primary heat supply network heat supply pipeline and the primary heat supply network heat return pipeline are respectively connected with the primary heat supply network heater, the condensed water pipeline system comprises a fifth low-pressure heater, a sixth low-pressure heater, a seventh low-pressure heater and a condensed water conveying pipeline, the condensed water conveying pipeline is sequentially provided with the seventh low-pressure heater, the sixth low-pressure heater and the fifth low-pressure heater, and the heating system is characterized in that the flue heat absorption system comprises the primary low-temperature economizer, an electric precipitator, an induced draft fan, the secondary low-temperature economizer and a desulfurization absorption tower, and the primary low-temperature economizer comprises the primary low-temperature economizer, The electric dust collector, the draught fan, the secondary low-temperature economizer and the desulfurization absorption tower are sequentially connected in the flue, the water inlet of the primary low-temperature economizer is communicated with the primary heat supply network heat return pipeline through a hot water inlet pipe, the water outlet of the primary low-temperature economizer is communicated with the primary heat supply network heat supply pipeline through a hot water outlet pipe, the hot water inlet pipe and the hot water outlet pipe are respectively provided with a control valve A and a control valve B, the water inlet of the secondary low-temperature economizer is connected with the water outlet of the seventh low-pressure heater through a water inlet main pipe, the water outlet of the secondary low-temperature economizer is respectively connected with the water inlet ends of a first water outlet pipe and a second water outlet pipe through a water outlet main pipe and a three-way pipe, the water outlet end of the first water outlet pipe is communicated with the water outlet of the sixth low-pressure heater, the water outlet end of the second water outlet pipe is communicated with the water inlet of the sixth low-pressure heater, and a circulating water guide pipe is arranged between the water inlet main pipe and the water outlet main pipe, the two ends of the circulating water guide pipe are respectively communicated with the water inlet main pipe and the water outlet main pipe, a circulating pump and a control valve C are arranged on the circulating water guide pipe, and a control valve D and a control valve E are respectively arranged on the first water outlet pipe and the second water outlet pipe.
2. The heating system with the secondary low-temperature economizer of claim 1, wherein a control valve F is arranged on a condensed water conveying pipeline between the second water outlet pipe and the water inlet main pipe.
3. The heating system with the secondary low-temperature economizer of claim 1, wherein the diameter of the circulating water guide pipe is smaller than the diameter of the water inlet main pipe and the water outlet main pipe, the circulating water guide pipe enables water in the water inlet main pipe and the water outlet main pipe to circulate, water in the water inlet main pipe is heated, and low-temperature corrosion of the secondary low-temperature economizer caused by low temperature of condensed water is prevented.
4. A heating system with a two-stage low-temperature economizer as claimed in claim 1, wherein the primary heating network heater is supplied by steam extracted from a steam turbine for heat exchange.
5. The heating system with the secondary low-temperature economizer of claim 1, wherein the primary heat supply network heating pipeline is provided with a heating valve G, and the primary heat supply network regenerative pipeline is provided with a regenerative valve H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121156564.6U CN214745984U (en) | 2021-05-27 | 2021-05-27 | Heating system with secondary low-temperature economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121156564.6U CN214745984U (en) | 2021-05-27 | 2021-05-27 | Heating system with secondary low-temperature economizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214745984U true CN214745984U (en) | 2021-11-16 |
Family
ID=78625826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121156564.6U Active CN214745984U (en) | 2021-05-27 | 2021-05-27 | Heating system with secondary low-temperature economizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214745984U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001348A (en) * | 2021-11-24 | 2022-02-01 | 三河发电有限责任公司 | Thermodynamic system |
-
2021
- 2021-05-27 CN CN202121156564.6U patent/CN214745984U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001348A (en) * | 2021-11-24 | 2022-02-01 | 三河发电有限责任公司 | Thermodynamic system |
| CN114001348B (en) * | 2021-11-24 | 2023-08-25 | 三河发电有限责任公司 | Thermodynamic system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102537933B (en) | Adjustable feed water heat regenerative system for turbo generator unit | |
| WO2022056990A1 (en) | Combined highly-efficient compression heat pump energy storage and peak regulation system and method for use with thermal power plant | |
| CN202768090U (en) | Recovery system of dead steam waste heat | |
| CN112611010B (en) | Adjusting method of flexible adjusting system for power generation load of multi-heat-source cogeneration unit | |
| CN107149873B (en) | Energy-saving full-load denitration system | |
| CN214745984U (en) | Heating system with secondary low-temperature economizer | |
| CN214370116U (en) | Intelligent diagnosis module based on large air preheater air heater system operation control | |
| CN107366897B (en) | A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system | |
| CN102494329B (en) | Device for utilizing flue gas waste heat of boiler comprehensively | |
| CN111322660B (en) | Integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system and method | |
| CN204665244U (en) | A kind of association system of phase-change heat-exchanger band heat exchangers for district heating | |
| CN214247503U (en) | Heat conduction oil furnace and organic Rankine cycle coupled gas turbine waste heat recovery system | |
| CN204962712U (en) | System is used multipurposely in multistage recovery of cogeneration of heat and power power plant flue gas waste heat | |
| CN109114583B (en) | Flue gas waste heat utilization system of coal-fired power plant and working method | |
| CN208687705U (en) | A kind of system that excision low pressure (LP) cylinder is coupled into automotive row with low-pressure coal saver | |
| CN208186478U (en) | Domestic garbage burning electricity generation low-temperature circulating water heating system | |
| CN209116822U (en) | A kind of residual heat of electric power plant and clean energy resource utilization system | |
| CN112483250A (en) | Heat conduction oil furnace and organic Rankine cycle coupled gas turbine waste heat recovery system | |
| CN206514282U (en) | Drive small machine cold end waste heat comprehensive utilization system in a kind of thermal power plant blower fan vapour Electricity Federation | |
| CN114659089B (en) | Deep waste heat utilization system and method for coal-fired generator set | |
| CN204648205U (en) | Steam power plant's back-end ductwork is without pump self-loopa two-way water feeding high/low temperature associating heating system | |
| CN114110638B (en) | Automatic regulating system and method for efficient flue gas waste heat utilization of bypass of air preheater | |
| CN212361988U (en) | Flue gas waste heat utilization system | |
| CN218760275U (en) | Solar energy-saving power generation system capable of reducing regenerative steam extraction | |
| CN214581178U (en) | Energy-saving application system of generalized heat regeneration technology on 600MW coal-electricity pure condensing unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |