CN107238232B - Regional centralized energy supply method - Google Patents
Regional centralized energy supply method Download PDFInfo
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- CN107238232B CN107238232B CN201611078141.0A CN201611078141A CN107238232B CN 107238232 B CN107238232 B CN 107238232B CN 201611078141 A CN201611078141 A CN 201611078141A CN 107238232 B CN107238232 B CN 107238232B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
Abstract
The invention relates to the technical field of regional heating/cooling systems, and particularly discloses a regional centralized energy supply method.A power supply system is adopted, the power supply system comprises a master station, at least one main power supply pipeline, a plurality of user side power supply devices and auxiliary power supply pipelines, and the energy efficiency of the master station is greater than that of the user side power supply devices; one end of the main energy supply pipeline is connected with the main station, and the other end of the main energy supply pipeline is connected to a user at a far end; user side energy supply equipment connects at least one nearby user nearby, and user side energy supply equipment is connected to supplementary energy supply pipeline one end, and the other end is connected to on the main energy supply pipeline, including the following step: s1, when users are few in the area, building user side energy supply equipment close to the positions of the users; s2, as the number of users in the area increases, a master station is built, the invention greatly reduces the investment, reduces the pump consumption and the heat loss of the system and has good system economy.
Description
Technical Field
The invention relates to the technical field of district heating/cooling systems, in particular to a district centralized energy supply method.
Background
With the large-area popularization of centralized cooling and heating in south, renewable energy is utilized to carry out regional centralized cooling and heating systems in more and more places, as shown in fig. 1, the system is mainly characterized in that a renewable energy centralized cooling and heating station house is arranged, a plurality of equipment units are arranged in the station house, energy supply is carried out outwards through a centralized pipeline, and a main station 1 is communicated with a user 5 through a water supply pipe and a water return pipe.
The system can be mainly used in areas with high volumetric efficiency, adopts renewable energy sources or other technologies with high energy efficiency, arranges multiple energy sources in one energy source station, and can achieve the purposes of improving the operation efficiency of the system and reducing the investment through the centralized supply of a pipe network. However, the system has a major problem, mainly focusing on:
1. when the energy supply radius is far, the system has large energy consumption and heat loss of a delivery pump;
2. the initial investment of a centralized energy supply system in a construction area is high, and particularly the investment of energy supply and delivery pipelines is high;
3. in the earlier stage of building and developing the regional centralized energy supply system, energy supply station rooms, equipment, pipelines and the like are required to be connected with users in advance, the users used in the earlier stage are fewer, the income is lower, and the system economy is poorer.
Disclosure of Invention
The invention researches and designs an area centralized energy supply method with small initial investment and good system economy aiming at the problems of high initial investment and poor system economy of the centralized energy supply in the area by adopting a main station in the prior art.
The technical scheme adopted by the invention is as follows:
an area centralized energy supply method adopts an area centralized energy supply system, the energy supply system comprises a main station, at least one main energy supply pipeline, a plurality of user side energy supply devices and auxiliary energy supply pipelines, and the energy efficiency of the main station is greater than that of the user side energy supply devices; one end of the main energy supply pipeline is connected with the main station, and the other end of the main energy supply pipeline is connected to a user at a far end; user side energy supply equipment connects at least one nearby user nearby, user side energy supply equipment is connected to supplementary energy supply pipeline one end, and the other end is connected to on the main energy supply pipeline, including the following step:
s1, when users are few in the area, firstly building user side energy supply equipment close to the user, and the user accesses the user side energy supply equipment nearby, so that the user side energy supply equipment meets the load requirements of the user;
s2, with the increase of users in the area, a master station is built, user side energy supply equipment is connected to an energy supply pipeline of the master station through an energy supply pipeline, and the energy efficiency of the master station is greater than that of the user side energy supply equipment; when the construction of both the user side energy supply equipment and the master station is completed, only the master station is operated in a season with low user load; and in the season with high load, when the main station cannot meet the load requirement of the user, starting the energy supply equipment at the user side for peak regulation.
Further, main energy supply pipeline includes main delivery pipe and main wet return, supplementary energy supply pipeline includes supplementary delivery pipe and supplementary wet return, and the user is connected to main energy supply pipeline through user delivery pipe and user wet return.
Furthermore, a main station water supply pump unit is connected to the side, close to the main water supply pipe, of the user water supply pipe, a user water return pump unit is connected to the side, close to the user, of the user water return pipe, and an auxiliary water pump unit is connected to the auxiliary water supply pipe.
Furthermore, the auxiliary water supply pipe and the auxiliary water return pipe are respectively and correspondingly connected with a first electronic pressure gauge and a second electronic pressure gauge, and the readings of the first electronic pressure gauge and the second electronic pressure gauge are respectively p1And p2Wherein Δ p ═ p1-p2The auxiliary water pump unit controls the flow of the water pump by adopting constant differential pressure variable frequency, and the value of delta p is constant after the temperature of a user side is set.
Further, the main station meets the requirement of a basic load which is 40% -50% of a design load, and the energy supply equipment at the user side meets the requirement of a peak load of a user which is 50% -60% of the design load.
Furthermore, the main station adopts a renewable energy technology and/or a combined cooling heating and power system.
Further, the master station begins to be engaged when more than 50% of all occupants in the area need access to the centralized energy supply system.
Furthermore, the auxiliary water pump unit adjusts the flow rate of the water pump by adopting constant pressure difference and variable frequency; the constant pressure difference of the auxiliary water pump unit is preset according to the load required by the connected users, and the set value of the constant pressure difference is gradually increased along with the increase of the connected users.
Compared with the prior art, the invention obviously has the following beneficial effects:
1. in the initial stage of less users in the region, the energy supply equipment is close to the user side of the user with simpler investment and construction system and low investment, and in the later stage, the energy supply equipment at the user side plays a role in peak regulation by investing the main station with higher energy efficiency and complex system with the increase of the users.
2. In the season of large user load, the main station bears 40-50% of load, and the user side energy supply equipment bears 50-60% of load, so that the peak regulation effect is achieved, the pipe diameter of the main energy supply pipeline is effectively reduced, the investment is greatly reduced, and meanwhile, the system conveying pump consumption and the heat loss are reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art area focused energy system;
FIG. 2 is a schematic diagram of a centralized energy supply system according to embodiment 1 of the present invention;
FIG. 3 is a detailed structural schematic diagram of a user heat exchange station and a user side energy supply device at A in FIG. 2;
FIG. 4 is a schematic structural diagram of a main station constructed in embodiment 1 of the present invention;
fig. 5 is a detailed structural schematic diagram of a user heat exchange station and user side energy supply equipment in embodiment 2 of the invention.
In the figure, 1, a main station, 2, a main energy supply pipeline, 21, a main water supply pipe, 22, a main water return pipe, 3, user side energy supply equipment, 4, an auxiliary energy supply pipeline, 41, an auxiliary water supply pipe, 42, an auxiliary water return pipe, 5, a user, 6, a user water return pump unit, 7, a main station water supply pump unit, 8, an auxiliary water pump unit, 9, a first electronic pressure gauge, 10 and a second electronic pressure gauge, 11, a shutoff valve, 12, a plate type heat exchanger, 13, a user heat exchange station, 14, a user water supply pipe, 15 and a user water return pipe.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The user base load in the invention refers to the load required by the user in a transition season (generally, spring and autumn); the design load refers to the load which can meet the requirements of users of the centralized energy supply system in the whole area; the user peak load refers to a value at which the actual required load of the user is higher than the user base load.
Example 1
As shown in fig. 2 to 4, when there are few users 5 in the area, and generally, it can be set that the number of users 5 in the area is 50% or less of the number of residents in the whole area, the user side energy supply device 3 is used to meet the load demand of the users 5, and when the number of users 5 increases gradually, and the number of users 5 in the area is 50% or more of the number of residents in the whole area, the master station 1 with high energy efficiency starts to be used. The master station 1 can adopt technologies with higher energy efficiency, such as renewable energy sources and/or a combined cooling, heating and power system. The energy supply equipment at the user side adopts the equipment with relatively low energy efficiency, small single investment and simple structure, such as an air-cooled heat pump, a gas boiler and the like.
The area concentrated energy supply method comprises the following steps:
s1, when the number of users 5 in the area is small, firstly building the user side energy supply equipment 3 close to the positions of the users 5, accessing the users 5 to the user side energy supply equipment 3 nearby, and meeting the load requirements of the users 5 by the user side energy supply equipment 3; as shown in fig. 4, one user-side energy supply device 3 can be connected to a plurality of users 5 at the same time, and can be connected to 1-3 users 5.
S2, with the increase of users 5 in the area, building a master station 1, see fig. 2, where the user-side energy supply device 3 is connected to the energy supply pipeline 2 of the master station through an energy supply pipeline, the energy efficiency of the master station 1 is greater than that of the user-side energy supply device 3, and generally, when the users 5 needing centralized energy supply exceed 50% of all residents in the area, the master station 1 starts to be put into use.
The main station 1 meets the basic load of the user, generally 40% -50% of the design load, and the user side equipment 3 meets the peak load of the user, generally 50% -60% of the design load, so as to play a role in peak regulation. Specifically, in spring and autumn with lower load, only the master station 1 can be operated, and the energy of the master station 1 is saved most due to higher energy efficiency; in the higher summer and winter season of load, full load operation main website 1 opens user side energy supply equipment 3 simultaneously, as the peak shaving, satisfies the not enough of main website 1 for user 5 energy supply.
2-4, the energy-efficient system for centralized energy supply in an area according to the embodiment of the present invention includes a main station 1, at least one main energy-efficient pipeline 2, a plurality of user-side energy-efficient devices 3, and an auxiliary energy-efficient pipeline 4, where the energy efficiency of the main station 1 is greater than that of the user-side energy-efficient devices 3; one end of the main energy supply pipeline 2 is connected with the main station 1, and the other end is connected to a user 5 at the far end; the user-side energy supply device 3 is connected in close proximity to at least one nearby user 5, and the auxiliary energy supply conduit 4 is connected at one end to the user-side energy supply device 3 and at the other end to the main energy supply conduit 2.
The main power supply duct 2 includes a main water supply pipe 21 and a main water return pipe 22, the auxiliary power supply duct 4 includes an auxiliary water supply pipe 41 and an auxiliary water return pipe 42, and the user 5 is connected to the main power supply duct 2 through the user water supply pipe 14 and the user water return pipe 15.
The main station water supply pump unit 7 is connected to the user water supply pipe 14 near the main water supply pipe 21, the user water return pump unit 6 is connected to the user water return pipe 15 near the user 5, and the auxiliary water supply pipe 41 is connected to the auxiliary water pump unit 8.
The auxiliary water supply pipe 41 and the auxiliary water return pipe 42 are respectively and correspondingly connected with a first electronic pressure gauge 9 and a second electronic pressure gauge 10, and the readings of the first electronic pressure gauge and the second electronic pressure gauge are respectively p1And p2Wherein Δ p ═ p1-p2The auxiliary water pump unit 8 controls the flow of the water pump by adopting constant differential pressure frequency conversion, after the temperature of the user 5 side is set, the value of delta p is constant, a differential pressure control valve is arranged at the front end of the water pump of the auxiliary water pump unit 8, the pressure requirement of the tail end is detected in real time through the differential pressure control valve, the constant differential pressure is used for adjusting the frequency of the water pump, and the load requirement of the user 5 is met.
The constant differential pressure value of the user side water pump unit is preset mainly according to the progress of terminal load construction, when the user side water pump unit is in the initial construction stage, the user side water pump unit mainly meets the load requirement of a peripheral user 5, and along with the progress of the construction progress, the user side water pump unit meets the load requirement of the peripheral user 5 by additionally arranging the differential pressure value (increasing the pipeline loss value of the nearby user 5). The constant pressure difference of the auxiliary water pump unit 8 is preset according to the load required by the connected users 5, and the set value of the constant pressure difference is gradually increased with the increase of the connected users 5.
The main station 1 adopts renewable energy or other technologies with higher energy efficiency, the investment is high, the construction time is long, the income is slow, the early-stage system economic performance of regional centralized energy supply construction is poor, and the energy consumption of the user side energy supply equipment 5 is relatively higher, but the investment is low, the construction time is short, and the load requirement of the user 5 can be timely met.
In this embodiment, as shown in fig. 3, the user 5 is directly connected to the energy supply main station 1, that is, before the energy supply pipeline of the user 5 is connected to the user 5, the water supply pipeline 14 and the water return pipeline 15 of the user are communicated, and a shut-off valve 11 is arranged on the communicated pipeline, so that when the user 5 does not need to supply energy, the shut-off valve 11 is opened, and the water in the water supply pipeline directly flows to the water return pipeline instead of flowing to the user 5.
Example 2
As shown in fig. 5, the difference with respect to embodiment 1 is that the user 5 is indirectly connected to the powered master station 1, and a plate heat exchanger 12 is provided between the user 5 and the powered master station 1.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that numerous changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. A regional centralized energy supply method is characterized in that a regional centralized energy supply system is adopted, the energy supply system comprises a main station (1), at least one main energy supply pipeline (2), a plurality of user side energy supply devices (3) and auxiliary energy supply pipelines (4), and the energy efficiency of the main station (1) is greater than that of the user side energy supply devices (3); one end of the main energy supply pipeline (2) is connected with the main station (1), and the other end of the main energy supply pipeline is connected to a user (5) at a far end; user side energy supply equipment (3) is connected at least one nearby user (5) nearby, user side energy supply equipment (3) is connected to supplementary energy supply pipeline (4) one end, and the other end is connected to on main energy supply pipeline (2), including the following step:
s1, when the number of users (5) in the area is small, firstly building user side energy supply equipment (3) close to the positions of the users (5), accessing the users (5) to the user side energy supply equipment (3) nearby, and meeting the load requirements of the users (5) through the user side energy supply equipment (3);
s2, with the increase of users (5) in the area, a main station (1) is built, a user side energy supply device (3) is connected to an energy supply pipeline (2) of the main station through an energy supply pipeline, and the energy efficiency of the main station (1) is greater than that of the user side energy supply device (3); when the user side energy supply equipment (3) and the master station (1) are built, only the master station (1) is operated in a season with low load of the user (5); and in the season with high load, when the main station (1) cannot meet the load demand of the user (5), starting the energy supply equipment (5) at the user side for peak regulation.
2. The regional concentrated energy supply method according to claim 1, wherein the main energy supply pipeline (2) comprises a main water supply pipe (21) and a main water return pipe (22), the auxiliary energy supply pipeline (4) comprises an auxiliary water supply pipe (41) and an auxiliary water return pipe (42), and the user (5) is connected to the main energy supply pipeline (2) through a user water supply pipe (14) and a user water return pipe (15).
3. The method of regional concentrated energy supply according to claim 2, wherein a main station water supply pump unit (7) is connected to the user water supply pipe (14) near the main water supply pipe (21), a user water return pump unit (6) is connected to the user water return pipe (15) near the user (5), and an auxiliary water pump unit (8) is connected to the auxiliary water supply pipe (41).
4. The method for supplying energy in concentrated areas according to claim 3, wherein a first electronic pressure gauge (9) and a second electronic pressure gauge (10) are respectively connected to the auxiliary water supply pipe (41) and the auxiliary water return pipe (42) and respectively have readings of p1And p2Wherein Δ p ═ p1-p2The auxiliary water pump unit (8) adopts constant differential pressure variable frequency to control the flow rate of the water pump, and after the temperature of the user (5) side is set, the value of delta p is constant.
5. The regional centralized power supply method according to claim 1, characterized in that the main station (1) meets the requirement of the base load by 40% -50% of the design load, and the user side power supply equipment (5) meets the requirement of the user peak load by 50% -60% of the design load.
6. Regional centralized energy supply method according to claim 1, characterized in that the primary station (1) uses renewable energy technology and/or combined cooling heating and power system.
7. A method for regional centralized power supply according to claim 1, characterized in that the primary station (1) is put into use when the number of users (5) who need to access the centralized power supply system exceeds 50% of all the residents in the region.
8. The regional centralized energy supply method according to claim 1, characterized in that the auxiliary water pump unit (8) adjusts the flow rate of the water pump by using constant differential pressure and variable frequency; the constant pressure difference of the auxiliary water pump unit (8) is preset according to the load required by the access user (5), and the set value of the constant pressure difference is gradually increased along with the increase of the access user (5).
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| CN204718180U (en) * | 2015-06-01 | 2015-10-21 | 北京京能未来燃气热电有限公司 | A kind of compound district heating and cooling system |
| CN204794123U (en) * | 2015-06-18 | 2015-11-18 | 苏州协鑫工业应用研究院有限公司 | Formula energy supply equipment is united to cool and thermal power that miniature domain type distributes |
| CN205717450U (en) * | 2016-06-17 | 2016-11-23 | 中节能先导城市节能有限公司 | The energy-conservation distributing system of a kind of central energy supply for high-storey, large area region |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203083197U (en) * | 2012-09-10 | 2013-07-24 | 陈戈 | Multisource domain type combined cooling , heating and power (CCHP) energy network system |
| CN203336754U (en) * | 2013-07-15 | 2013-12-11 | 深圳市燃气集团股份有限公司 | Distributed energy resource and ice-storage air conditioner networking operation system |
| CN204718180U (en) * | 2015-06-01 | 2015-10-21 | 北京京能未来燃气热电有限公司 | A kind of compound district heating and cooling system |
| CN204794123U (en) * | 2015-06-18 | 2015-11-18 | 苏州协鑫工业应用研究院有限公司 | Formula energy supply equipment is united to cool and thermal power that miniature domain type distributes |
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