CN109737620B - System and method for heating heat supply pipe network steam and condensed water by solar energy - Google Patents
System and method for heating heat supply pipe network steam and condensed water by solar energy Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229920006395 saturated elastomer Polymers 0.000 claims description 33
- 230000009471 action Effects 0.000 claims description 4
- 238000003303 reheating Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention discloses a system and a method for heating steam and condensed water of a heat supply pipe network by solar energy, wherein the system comprises a drainage system and a heating system, the heating system comprises a groove type solar heat collector, the groove type solar heat collector is connected with a superheater through a first heating pipeline, the superheater is provided with two outlets, the first superheater outlet is connected with a main pipeline, and the second superheater outlet is connected with an evaporator; the evaporator is provided with three outlets, the first evaporator outlet is connected with the trough type solar heat collector through a second heating pipeline, the second evaporator outlet is connected with a drainage header in the drainage system, the third evaporator outlet is connected with a main pipeline, heat conduction oil is heated through the heat collector, the heat conduction oil is circularly used in two paths in a reciprocating mode, the energy is utilized in a cascade mode, the effect is good, and the cost is low.
Description
Technical Field
The invention relates to a system and a method for heating steam and condensed water of a heating pipe network by solar energy, belonging to the technical field of clean energy utilization.
Background
The central heating currently has the problems of pipe network heat loss, pipeline conveying energy consumption, high maintenance cost, incapability of recovering condensed water, influence of the condensed water on heat metering and the like. Rock wool materials are used for the heat-insulating layer materials of the central heating pipeline, gaps can be formed between the pipeline and the heat-insulating layer due to easy sedimentation in use, and in the heating process, convection heat exchange is carried out between air in the gaps and the pipe wall, so that heat loss of a heating pipe network is large. The problem of heating condensation water is not well solved in the heating process. There are many factors that cause condensation water, such as: equipment, pipe fittings, pipe connections are not firm, pipe fitting materials, heating temperatures and the like can cause condensation water. On the other hand, the construction technology and quality of the pipe network system also influence the formation of condensed water, and if the construction is not carried out according to a strict operation flow, the problem of the condensed water of the pipe network can be caused. The condensed water can not only infiltrate the pipeline, shorten the service life of the pipeline, but also affect the overall heat supply quality, enhance the heat supply consumption, and the condensed water should be considered for the optimization of the central heat supply pipe network.
The existing heat supply network transformation technology is basically to replace heat insulation materials in a traditional way, optimize the design of a heat supply network line, but has the defects of large transformation cost, limited improvement effect and longer construction period, and influences the use of heat by the existing users.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides a system for heating pipe network steam and condensed water by solar energy, which sequentially heats heating saturated steam and condensed water by high-temperature heat conduction oil and has cascade utilization of capacity.
The technical scheme is as follows: in order to solve the technical problems, the system for heating the steam and the condensed water of the heat supply pipe network by the solar energy comprises a drainage system and a heating system,
the heating system comprises a trough type solar heat collector 1, wherein the trough type solar heat collector 1 is connected with a superheater 3 through a first heating pipeline 14, the superheater 3 is provided with two outlets, a first superheater outlet 3-1 is connected with a main pipeline 13, and a second superheater outlet 3-2 is connected with an evaporator 9; the evaporator 9 is provided with three outlets, the first evaporator outlet 9-1 is connected with the trough type solar collector 1 through a second heating pipeline 15, the second evaporator outlet 9-2 is connected with the drainage header 7 in the drainage system, and the third evaporator outlet 9-3 is connected with the main pipeline 13;
the first heating pipeline 14 is connected with a high-temperature heat conduction oil storage tank 4; the second heating pipeline 15 is connected with a low-temperature heat conduction oil storage tank 5;
the drainage system also comprises a drainage pump 8 arranged between the drainage header 7 and the evaporator 9 and a drainage pipeline connecting the main pipeline 13 and the drainage header 7;
the drain pump 8 also functions as a circulation pump so that the drain water flows in the pipe.
Further, the superheater 3 is a shell-and-tube superheater.
Further, the heat transfer oil stop valves 12 are disposed on the connection lines of the high temperature heat transfer oil storage tank 4 and the first heating pipeline 14 and the connection lines of the low temperature heat transfer oil storage tank 5 and the second heating pipeline 15.
Further, the electromagnetic valves 10 are provided on the connection lines of the evaporator 9 and the main pipe 13 and the connection lines of the superheater 3 and the main pipe 13.
Further, the drain line comprises a set of drain line branches, on which drain valves 6 are arranged.
In order to better utilize the system for heating the heat supply pipe network steam and the condensed water by the solar energy, the invention also provides a method for heating the heat supply pipe network steam and the condensed water by the solar energy, which comprises the following steps: the groove type solar heat collector 1 heats conduction oil in a circulating pipeline, and the heated conduction oil circularly flows in a pipe network through a circulating pump;
one path of heat conduction oil heats saturated steam in a pipe network through the superheater 3 until the heat conduction oil is in an overheat state, the heat conduction oil with lower temperature coming out from the superheater is further used for heating condensed water collected in the pipe network through the evaporator 9 to generate saturated steam with the same pressure and temperature as those of the main pipeline, and the saturated steam is led to the main pipeline 13 through the third evaporator outlet 9-3 for use; the heat transfer oil used by the evaporator is circulated back to the trough type solar collector 1 for reheating by the first evaporator outlet 9-1;
the other path of heat conduction oil flows into the high-temperature heat conduction oil storage tank 4, when the temperature of the heat conduction oil at the outlet of the trough type solar heat collector is lower than 230 ℃, the heat conduction oil flows out from the high-temperature heat conduction oil storage tank 4, and the heat conduction oil passes through the superheater 3 to heat saturated steam in a pipe network until the heat conduction oil is in a superheated state, the heat conduction oil with lower temperature which is discharged from the superheater passes through the evaporator 9 to heat condensed water collected in the pipe network, so that saturated steam with the same pressure and temperature as the main pipeline is generated, and the saturated steam passes through the third evaporator outlet 9-3 to the main pipeline 13 for use; at this time, the heat conduction oil used by the evaporator directly enters the low-temperature heat conduction oil storage tank 5, and when the temperature of the heat conduction oil in the trough type solar heat collector is higher than 230 ℃, the heat conduction oil stored in the low-temperature heat conduction oil storage tank 5 enters the trough type solar heat collector 1 for heating.
Further, while the trough type solar collector heats the heat conduction oil in the circulating pipeline, condensed drain generated by the main pipeline flows into the drain header 7 through a group of drain pipeline branches, the condensed drain in the drain header 7 flows into the evaporator 9 for heating under the action of the drain pump 8, and flows into the main pipeline 13 for use after the condensed drain is heated to a saturated state. The working flow of condensing and dewatering is to heat saturated steam with the same temperature and pressure in the main pipe, and heat the saturated steam into overheat state in the superheater after merging with the steam in the main pipe.
The working principle of the invention is as follows: according to weather conditions and the steam flow of a heat supply pipe network, controlling the other part of high-temperature heat conduction oil to flow into the high-temperature heat storage tank 4, and flowing out heating heat supply saturated steam from the high-temperature storage tank 4 at night or in overcast and rainy days, wherein the low-temperature heat conduction oil flows back into the low-temperature storage tank 5 after heating. The temperature gradually increases and then flows out of the solar collector. The heated high-temperature heat conduction oil flows into a high-temperature storage tank in the heat storage system, wherein a part of the high-temperature heat conduction oil flows out of the high-temperature storage tank, exchanges heat with a heated medium in a two-stage heat exchanger passing through an evaporator and a superheater successively, and flows back into a low-temperature storage tank. The condensed drain water is heated to a saturated state in the evaporator 9 and then is collected into a heat supply pipe, and then exchanges heat with high-temperature heat conduction oil in a superheater together with steam in the pipe; and the other part of high-temperature heat conduction oil is stored in the high-temperature storage tank, and heat exchange is continuously output when no sunlight exists at night, so that the heat of the high-temperature heat conduction oil is fully utilized.
The beneficial effects are that: (1) The solar energy is used as clean energy, the cost is low, no pollution is caused, the high-temperature heat conduction oil sequentially heats the heat supply saturated steam and the condensed water, the energy is utilized in a gradient way, and the quality of the existing steam and the loss of the condensed water are greatly improved; (2) By adopting the invention, the original heating pipe network has less reconstruction places, lower reconstruction cost and higher feasibility.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Wherein: the solar heat collector comprises a tank type solar heat collector 1, a circulating pump 2, a superheater 3, a first superheater outlet 3-1, a second superheater outlet 3-2, a high-temperature heat-conducting oil storage tank 4, a low-temperature heat-conducting oil storage tank 5, a drain valve 6, a drain header 7, a drain pump 8, an evaporator 9, a first evaporator outlet 9-1, a second evaporator outlet 9-2, a third evaporator outlet 9-3, a steam electromagnetic valve 10, a drain stop valve 11, a heat-conducting oil stop valve 12, a main pipeline 13, a first heating pipeline 14 and a second heating pipeline 15.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Examples
The system for heating the steam and the condensed water of the heat supply pipe network by using the solar energy comprises a drainage system and a heating system,
the heating system comprises a trough type solar heat collector 1, wherein the trough type solar heat collector 1 is connected with a superheater 3 through a first heating pipeline 14, the superheater 3 is provided with two outlets, a first superheater outlet 3-1 is connected with a main pipeline 13, and a second superheater outlet 3-2 is connected with an evaporator 9; the evaporator 9 is provided with three outlets, the first evaporator outlet 9-1 is connected with the trough type solar collector 1 through a second heating pipeline 15, the second evaporator outlet 9-2 is connected with the drainage header 7 in the drainage system, and the third evaporator outlet 9-3 is connected with the main pipeline 13;
the first heating pipeline 14 is connected with a high-temperature heat conduction oil storage tank 4; the second heating pipeline 15 is connected with a low-temperature heat conduction oil storage tank 5;
the drainage system also comprises a drainage pump 8 arranged between the drainage header 7 and the evaporator 9 and a drainage pipeline connecting the main pipeline 13 and the drainage header 7;
the drain pump 8 also functions as a circulation pump so that the drain water flows in the pipe.
The superheater 3 is a shell-and-tube superheater. The heat conducting oil stop valves 12 are arranged on the connecting pipelines of the high-temperature heat conducting oil storage tank 4 and the first heating pipeline 14 and the connecting pipelines of the low-temperature heat conducting oil storage tank 5 and the second heating pipeline 15. The solenoid valve 10 is arranged on the connecting pipeline between the evaporator 9 and the main pipeline 13 and the connecting pipeline between the superheater 3 and the main pipeline 13. The drain pipeline comprises a group of drain pipeline branches, and drain valves 6 are arranged on the drain pipeline branches. And a circulating pump 2 is also arranged between the high-temperature heat-conducting oil storage tank and the superheater.
In order to better utilize the system for heating the heat supply pipe network steam and the condensed water by the solar energy, the invention also provides a method for heating the heat supply pipe network steam and the condensed water by the solar energy, which comprises the following steps: the groove type solar heat collector 1 heats conduction oil in a circulating pipeline, and the heated conduction oil circularly flows in a pipe network through a circulating pump;
one path of heat conduction oil heats saturated steam in a pipe network through the superheater 3 until the heat conduction oil is in an overheat state, the heat conduction oil with lower temperature coming out from the superheater is further used for heating condensed water collected in the pipe network through the evaporator 9 to generate saturated steam with the same pressure and temperature as those of the main pipeline, and the saturated steam is led to the main pipeline 13 through the third evaporator outlet 9-3 for use; the heat transfer oil used by the evaporator is circulated back to the trough type solar collector 1 for reheating by the first evaporator outlet 9-1;
the other path of heat conduction oil flows into the high-temperature heat conduction oil storage tank 4, when the temperature of the heat conduction oil at the outlet of the trough type solar heat collector is lower than 230 ℃, the heat conduction oil flows out from the high-temperature heat conduction oil storage tank 4, and the heat conduction oil passes through the superheater 3 to heat saturated steam in a pipe network until the heat conduction oil is in a superheated state, the heat conduction oil with lower temperature which is discharged from the superheater passes through the evaporator 9 to heat condensed water collected in the pipe network, so that saturated steam with the same pressure and temperature as the main pipeline is generated, and the saturated steam passes through the third evaporator outlet 9-3 to the main pipeline 13 for use; at this time, the heat conduction oil used by the evaporator directly enters the low-temperature heat conduction oil storage tank 5, and when the temperature of the heat conduction oil in the trough type solar heat collector is higher than 230 ℃, the heat conduction oil stored in the low-temperature heat conduction oil storage tank 5 enters the trough type solar heat collector 1 for heating.
While the groove type solar heat collector heats the heat conduction oil in the circulating pipeline, condensed drain generated by the main pipeline flows into the drain header 7 through a group of drain pipeline branches, the condensed drain in the drain header 7 flows into the evaporator 9 for heating under the action of the drain pump 8, and flows into the main pipeline 13 for use after the condensed drain is heated to a saturated state. The working flow of condensing and dewatering is to heat saturated steam with the same temperature and pressure in the main pipe, and heat the saturated steam into overheat state in the superheater after merging with the steam in the main pipe.
The working flow of the invention is as follows:
when the heat conduction oil in the trough type solar heat collector is lower than 230 ℃, the trough type solar heat collector 1 heats the heat conduction oil in the circulating pipeline, the heated heat conduction oil circularly flows in the heat supply pipe network through the circulating pump, the heat conduction oil circularly flows in two paths, the first path of heat conduction oil heats saturated steam and condensed water through the superheater and the evaporator, so that the heat conduction oil is used for a main pipeline, and at the moment, the heat conduction oil temperature through the superheater and the evaporator is reduced and circulated to the trough type solar heat collector for reheating and circularly reciprocating. The second path of heat conduction oil flows into the high-temperature heat conduction oil storage tank for storage, when the heat conduction oil in the trough type solar heat collector is lower than 230 ℃, the circulation of the first path of heat conduction oil is stopped, the second path of heat conduction oil flows out of the high-temperature heat conduction oil storage tank, passes through the superheater and the evaporator to heat saturated steam and condensed water in the heat supply pipe network, at the moment, the heat conduction oil passing through the superheater and the evaporator flows into the low-temperature heat conduction oil storage tank 5, and when the heat conduction oil in the trough type solar heat collector is higher than 230 ℃, the heat conduction oil stored in the low-temperature heat conduction oil storage tank 5 enters the trough type solar heat collector 1 for heating.
When the heat conduction oil works, condensed drain generated by the main pipeline flows into the drain header 7 through a group of drain pipeline branches, condensed drain in the drain header 7 flows into the evaporator 9 for heating under the action of the drain pump 8, and flows into the main pipeline 13 for use after the condensed drain is heated to a saturated state, and a drain stop valve 11 arranged on one side of the drain pump 8 is opened or stopped according to requirements.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.
Claims (6)
1. The method for heating the heat supply pipe network steam and condensed water by using the solar energy is characterized in that the heating system comprises a drainage system and a heating system, and is characterized in that the heating system comprises a trough type solar heat collector (1), the trough type solar heat collector (1) is connected with a superheater (3) through a first heating pipeline (14), the superheater (3) is provided with two outlets, the first superheater outlet (3-1) is connected with a main pipeline (13), and the second superheater outlet (3-2) is connected with an evaporator (9); the evaporator (9) is provided with three outlets, the first evaporator outlet (9-1) is connected with the trough type solar heat collector (1) through a second heating pipeline (15), the second evaporator outlet (9-2) is connected with a drainage header (7) in a drainage system, and the third evaporator outlet (9-3) is connected with a main pipeline (13);
the first heating pipeline (14) is connected with a high-temperature heat conduction oil storage tank (4); the second heating pipeline (15) is connected with a low-temperature heat conduction oil storage tank (5);
the drainage system also comprises a drainage pump (8) arranged between the drainage header (7) and the evaporator (9) and a drainage pipeline for connecting the main pipeline (13) and the drainage header (7);
the method is characterized in that: the groove type solar heat collector (1) heats the heat conduction oil in the circulating pipeline, and the heated heat conduction oil circularly flows in the pipe network through the circulating pump;
one path of heat conduction oil heats saturated steam in the pipe network through the superheater (3) until the saturated steam is overheated, the heat conduction oil with lower temperature coming out from the superheater heats condensed water collected in the pipe network through the evaporator (9) to generate saturated steam with the same pressure and temperature as the main pipeline, and the saturated steam is led to the main pipeline (13) through the outlet (9-3) of the third evaporator for use; the heat conduction oil used by the evaporator is circulated back to the trough type solar heat collector (1) through the first evaporator outlet (9-1) for reheating;
the other path of heat conduction oil flows into the high-temperature heat conduction oil storage tank (4), when the temperature of the heat conduction oil in the trough type solar heat collector (1) is lower than 230 ℃, the heat conduction oil flows out from the high-temperature heat conduction oil storage tank (4) and passes through saturated steam in a heating pipe network of the superheater (3) until the heat conduction oil is in a superheated state, the lower-temperature heat conduction oil which comes out from the superheater passes through the evaporator (9) to heat condensed water collected in the pipe network, saturated steam with the same pressure and temperature as the main pipeline is generated, and the saturated steam is led to the main pipeline (13) for use through a third evaporator outlet (9-3); at the moment, the heat conduction oil used by the evaporator directly enters the low-temperature heat conduction oil storage tank (5), and when the temperature of the heat conduction oil in the groove type solar heat collector (1) is higher than 230 ℃, the heat conduction oil stored in the low-temperature heat conduction oil storage tank (5) enters the groove type solar heat collector (1) for heating.
2. The method for heating pipe network steam and condensed water according to claim 1, wherein: the method comprises the steps that when the groove type solar heat collector (1) heats heat conduction oil in a circulating pipeline, condensed drain generated by a main pipeline flows into a drain header (7) through a group of drain pipeline branches, the condensed drain in the drain header (7) flows into an evaporator (9) to be heated under the action of a drain pump (8), and flows into a main pipeline (13) to be used after the condensed drain is heated to a saturated state with the same pressure and temperature as the main pipeline.
3. The method for heating pipe network steam and condensed water according to claim 1, wherein: the superheater (3) is a shell-and-tube superheater.
4. The method for heating pipe network steam and condensed water according to claim 1, wherein: and heat conducting oil stop valves (12) are arranged on the connecting pipelines of the high-temperature heat conducting oil storage tank (4) and the first heating pipeline (14) and the connecting pipelines of the low-temperature heat conducting oil storage tank (5) and the second heating pipeline (15).
5. The method for heating pipe network steam and condensed water according to claim 1, wherein: electromagnetic valves (10) are arranged on the connecting pipeline of the evaporator (9) and the main pipeline (13) and the connecting pipeline of the superheater (3) and the main pipeline (13).
6. The method for heating pipe network steam and condensed water according to claim 1, wherein: the drainage pipeline comprises a group of drainage pipeline branches, and drainage valves (6) are arranged on the drainage pipeline branches.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548879 | 2018-12-18 | ||
| CN2018115488798 | 2018-12-18 |
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| CN109737620A CN109737620A (en) | 2019-05-10 |
| CN109737620B true CN109737620B (en) | 2024-02-09 |
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| CN112914142B (en) * | 2021-03-05 | 2023-04-07 | 重庆中烟工业有限责任公司涪陵卷烟厂 | Method for discharging condensed water of heat exchanger of cut tobacco dryer |
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