CN109764387B - System for carrying out combined cooling and heating by utilizing regional heating network and control method - Google Patents
System for carrying out combined cooling and heating by utilizing regional heating network and control method Download PDFInfo
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Abstract
A system and a control method for carrying out cold and hot combined supply by utilizing a regional heating network. The invention utilizes the regional heating network in the existing central heating system, and realizes central refrigeration in summer and central heating in winter by adding the water chiller and matching with intermediate water in a proper temperature range. The invention uses the idle regional heating network in non-heating season as the intermediate water conveying channel, thereby needing no newly built cold water network and greatly reducing investment and equipment management and maintenance cost. Because of network multiplexing, the invention can also recycle the waste heat obtained by refrigeration and be used for urban domestic hot water. Meanwhile, the medium-temperature intermediate water is conveyed by the heat supply pipe network, so that the temperature difference can be increased, the conveying capacity and the conveying radius can be improved, and the conveying energy consumption can be reduced. The invention can improve the economy and efficiency of the whole system on one hand, and is beneficial to reducing the consumption of fossil fuel and reducing the pollutant and carbon emission on the other hand.
Description
Technical Field
The invention relates to the field of urban heat supply, in particular to a system for carrying out combined cooling and heating by utilizing a regional heating network and a control method.
Background
With the continuous development of urban scale and the continuous growth of population, the running of cities requires more energy consumption to meet the heating and cooling demands of residents. In order to effectively save energy and reduce environmental pollution, central heating and refrigeration are an important measure for sustainable development.
For northern cities, the central heating system of the cities has been developed for a long time, but the central cooling system is difficult to promote in a large scale for various reasons. In addition, concentrated refrigeration can also intensively generate a large amount of waste heat, and the heat island effect of cities can be aggravated.
Taking Beijing as an example, along with the development of service industry, financial industry and IT industry, a large number of public clusters such as science and technology gardens, entrepreneurs and development areas appear, and the conditions for implementing centralized refrigeration transformation are provided to a certain extent. However, the urban land is tense, the construction of a centralized refrigeration station and a cold water pipe network has great implementation difficulty, and how to sustainable develop urban centralized refrigeration becomes a problem faced by large-scale urban development.
Disclosure of Invention
The invention provides a system capable of utilizing a regional heating network to perform combined cooling and heating supply and a control method of the system, aiming at the defects of the prior art.
First, to achieve the above object, a system for providing heat and cold by using a regional heating network is provided, which includes: a district heating network having one end connected to a heating plant and the other end connected to a user building, the district heating network comprising a high Wen Zhongjie water pipe containing high Wen Zhongjie water at 20 ℃ or more and a low temperature intermediate water pipe containing low temperature intermediate water at 15 ℃ or less; the heat supply plant is internally provided with a heat pump integrated system, and the waste heat of intermediate water in the regional heat supply network is recovered to a heat supply large network so as to be used for domestic hot water in the whole market; wherein the temperature of the backwater of the heating large network is 50 ℃ or below, and the temperature of the water supply of the heating large network is 60 ℃ or above; the user side water chiller is connected with an ambient temperature regulatorThe system comprises a user area, an environment temperature adjusting pipeline, a user side water chiller and a water storage device, wherein the user side water chiller is used for transferring heat in the environment temperature adjusting pipeline to intermediate water of the area heat supply network so as to reduce the environment temperature in the user area; the user side heat pump is connected with the environment temperature regulating pipeline, the environment temperature regulating pipeline provides heat for the user area, and the user side heat pump transfers heat in intermediate water of the area heat supply network into the environment temperature regulating pipeline so as to improve the environment temperature in the user area; the user side valve system comprises valves respectively connecting the high-temperature intermediate water pipeline, the low-temperature intermediate water pipeline, the water inlet and the water outlet of the user side water chiller, and the water inlet and the water outlet of the user side heat pump, and is used for controlling the intermediate water in the regional heating network to be input into the user side water chiller or the user side heat pump and receiving backwater discharged by the user side water chiller or the user side heat pump; an ambient temperature sensor arranged in a public area in the user building for collecting the ambient temperature T in the user area e The method comprises the steps of carrying out a first treatment on the surface of the The regional heat supply network line temperature sensor is arranged in a high-temperature intermediate water pipeline or a low-temperature intermediate water pipeline of the regional heat supply network and is used for collecting the water supply temperature T in the regional heat supply network line s The method comprises the steps of carrying out a first treatment on the surface of the A control unit electrically connected with the ambient temperature sensor and the regional heat network line temperature sensor and used for controlling the temperature according to the ambient temperature T e Said water supply temperature T s Setting the system in a heating state or a refrigerating state, adjusting the opening degree of each valve in the user side valve system, and correspondingly increasing or decreasing the ambient temperature in the user area to a set temperature range.
Optionally, in the above system for performing combined cooling and heating by using a regional heating network, the user side water chiller and the user side heat pump are both disposed near or in a user building; the user side water chiller and the user side heat pump share the same group of environment temperature regulating pipelines, wherein a water inlet of the environment temperature regulating pipelines is connected with a cold water interface of the user side water chiller or a hot water interface of the user side heat pump through a first control valve, and a water outlet of the environment temperature regulating pipelines is connected with a hot water interface of the user side water chiller or a cold water interface of the user side heat pump through a second control valve; the first control valve is linked with the second control valve, in a heating state, the first control valve opens a hot water interface of the user side heat pump, meanwhile, the second control valve opens a cold water interface of the user side heat pump, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heating network to the hot water interface of the user side heat pump so as to be input into the environment temperature regulating pipeline, so that the environment temperature in a user region is improved; in a refrigeration state, the first control valve opens the cold water interface of the user side cold water machine, the second control valve opens the hot water interface of the user side cold water machine, the user side cold water machine injects cold water into the environment temperature regulating pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area through the environment temperature regulating pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced. The linkage between the valves can be achieved by a mechanical linkage structure or a circuit component controlled by linkage.
Optionally, in the above system for combined cooling and heating by using a regional heating network, the heating plant is disposed in a region far away from a user building, and is connected to a plurality of regional heating networks, for providing intermediate water to each regional heating network, and recovering waste heat of the intermediate water in each regional heating network to the heating large network.
Optionally, in the above system for performing combined cooling and heating by using a regional heat supply network, the heat pump integrated system of the heat supply plant includes multiple stages of heat pumps connected in parallel, each stage of heat pump is connected with one regional heat supply network, and each stage of heat pump recovers the waste heat of intermediate water in the regional heat supply network connected with each stage of heat pump into the heat supply large network.
Optionally, in the above system for combined cooling and heating using a district heating network, the control unit is configured to adjust the valve system of the user side according to the following stepsOpening degree of each valve: the first step, the ambient temperature T acquired by the ambient temperature sensor is acquired according to a set period e And the water supply temperature T acquired by the regional heat supply network line temperature sensor s At the ambient temperature T e Setting the system in a cooling state when the upper limit of the set temperature range is exceeded within a set period span; at the ambient temperature T e When the lower limit of the set temperature range is not reached in the period span exceeding the set period span, setting the system in a heating state; in a refrigerating state, a cold water interface of the user side cold water machine is communicated with a water inlet of the environment temperature adjusting pipeline, a hot water interface of the user side cold water machine is communicated with a water outlet of the environment temperature adjusting pipeline, cold water is injected into the environment temperature adjusting pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area by the environment temperature adjusting pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced; in a heating state, a hot water interface of the user side heat pump is communicated with a water inlet of the environment temperature adjusting pipeline, a cold water interface of the user side heat pump is communicated with a water outlet of the environment temperature adjusting pipeline, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heating network to the hot water interface of the user side heat pump so as to be input into the environment temperature adjusting pipeline, so that the environment temperature in a user region is improved; third step, according to the ambient temperature T e And the water supply temperature T s Calculating the variation of the opening degree of each valve in the user side valve system as follows
Wherein T is 0 A median representing the set temperature range; k (K) 0 An initial value representing the opening of the valve; sigma R represents the heat energy coefficient of the pipeline, and 20-80 km/kW is taken to determine a specific numerical value according to the type of a user building; l represents the total length of the pipeline in the regional heating network; fourth, according to the change of the opening degree delta K, adjusting each valve: in the cold state, connectThe opening of a first user side valve of the water outlet of the user side water chiller and the high temperature intermediate water pipeline and/or the opening of a second user side valve of the water inlet of the user side water chiller and the low temperature intermediate water pipeline are/is increased according to the absolute value |delta K| of the variation of the opening; and in a refrigeration state, the opening degree of a third user side valve connected with the user side heat pump water inlet and the high temperature intermediate water pipeline and/or the opening degree of a fourth user side valve connected with the user side heat pump water outlet and the low temperature intermediate water pipeline is increased according to the variation delta K of the opening degree.
Optionally, in the above system for combined cooling and heating by using a regional heat supply network, the heat pump in the heat pump integrated system includes any one or a combination of an electric centrifugal heat pump, an electric screw compression heat pump or a direct-fired absorption heat pump.
Secondly, in order to achieve the above purpose, a control method for the above system for combined cooling and heating by using a regional heating network is also provided, which comprises the following steps: the first step, the ambient temperature T acquired by the ambient temperature sensor is acquired according to a set period e And the water supply temperature T acquired by the regional heat supply network line temperature sensor s At the ambient temperature T e Setting the system in a cooling state when the upper limit of the set temperature range is exceeded within a set period span; at the ambient temperature T e Setting the system in a heating state when the lower limit of the set temperature range is not reached within a set period span, wherein the period span can be set to at least 12 hours; in a refrigerating state, a cold water interface of the user side cold water machine is communicated with a water inlet of the environment temperature adjusting pipeline, a hot water interface of the user side cold water machine is communicated with a water outlet of the environment temperature adjusting pipeline, cold water is injected into the environment temperature adjusting pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area by the environment temperature adjusting pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced; in a heating state, the user side heat pumpThe hot water interface of the user side heat pump is communicated with the water inlet of the environment temperature regulating pipeline, the cold water interface of the user side heat pump is communicated with the water outlet of the environment temperature regulating pipeline, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heat supply network to the hot water interface of the user side heat pump so as to be input into the environment temperature regulating pipeline, so that the environment temperature in a user region is improved; third step, according to the ambient temperature T e And the water supply temperature T s Calculating the variation delta K of the opening degree of each valve in the valve system of the user side; fourth, according to the change of the opening degree delta K, adjusting each valve: in a refrigeration state, the opening of a first user side valve connected with the water outlet of the user side water chiller and the high-temperature intermediate water pipeline and/or the opening of a second user side valve connected with the water inlet of the user side water chiller and the low-temperature intermediate water pipeline are increased by |delta K|% relative to the current opening according to the change amount of the opening; and in a refrigeration state, the opening of a third user side valve connected with the user side heat pump water inlet and the high temperature intermediate water pipeline and/or the opening of a fourth user side valve connected with the user side heat pump water outlet and the low temperature intermediate water pipeline is increased by delta K percent relative to the current opening according to the variation delta K of the opening.
Optionally, in the above control method, the variation of the opening of each valve is calculated as follows:
wherein T is 0 A median representing the set temperature range; k (K) 0 An initial value representing the opening of the valve; sigma R represents the heat energy coefficient of the pipeline, 20-80 km/kW is taken, the concrete value is determined by the intensity of the temperature control requirement of a user building, the heat energy coefficient of the pipeline of a commercial building is larger than that of a public building, and the heat energy coefficient of the pipeline of the public building is larger than that of a residential building; l represents the total length of the pipeline in the district heating network, in km.
Optionally, in the above control method, the period of sampling set by the ambient temperature sensor or the regional heat pipe line temperature sensor is at least sampling every hour; and after each sampling, regulating the opening of each valve in the valve system at the user side according to the first step to the 4 th step.
Optionally, in the above control method, the set period span is at least 12 hours, so as to avoid erroneous judgment.
Advantageous effects
The invention utilizes the regional heating network in the existing central heating system, and realizes central refrigeration in summer and central heating in winter by adding the water chiller and matching with intermediate water in a proper temperature range. The invention uses the idle regional heating network in non-heating season as the intermediate water conveying channel, thereby needing no newly built cold water network and greatly reducing investment and equipment management and maintenance cost. Because of network multiplexing, the invention can also recycle the waste heat obtained by refrigeration and be used for urban domestic hot water. Meanwhile, the medium-temperature intermediate water is conveyed by the heat supply pipe network, so that the temperature difference can be increased, the conveying capacity and the conveying radius can be improved, and the conveying energy consumption can be reduced. Furthermore, a heat pump integrated system is built in a heat supply plant applied to the system, so that waste heat can be recovered to a peripheral city heat supply large network while medium water is produced, and the system is used for using domestic hot water in the whole city. On one hand, the economy and efficiency of the whole system can be improved, and on the other hand, the consumption of fossil fuel can be reduced, and the pollutant and carbon emission can be reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, and do not limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall architecture of a system for combined cooling and heating using a district heating network according to the present invention;
FIG. 2 is a schematic diagram of the connection relationship of each valve in the system for combined cooling and heating by using the regional heating network according to the present invention;
fig. 3 is a schematic diagram of connection relationship between heat pumps of each stage included in an integrated heat pump system in a heating plant in a system for combined cooling and heating by using a district heating network according to the present invention.
In fig. 3, only one stage of heat pump is specifically shown as an example, and the rest stages of heat pumps are implemented by adopting a similar topological structure.
In the figure, 3 denotes a district heating network water supply regulating valve, 4 denotes a front valve of a district heating network water return booster pump, 5 denotes a rear valve of the district heating network water return booster pump, 6 denotes a user water return shutoff valve, 7 denotes a district heating network load, 12 denotes a district heating network water return booster pump, 101 denotes a first control valve, 201 denotes a second control valve, 301 denotes a first user side valve, 302 denotes a second user side valve, 303 denotes a third user side valve, and 304 denotes a fourth user side valve.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in the present invention means that each exists alone or both exist.
"connected" as used herein means either a direct connection between components or an indirect connection between components via other components.
The invention utilizes the central heating system of large cities to provide heat supply in winter and provide urban domestic hot water service for partial areas in summer. And particularly, part of pipelines in an idle state and the flue gas waste heat recovery heat pump are utilized to realize refrigeration in summer and transport refrigeration intermediate water. The invention relates to a system for carrying out cold and hot combined supply by utilizing a regional heating network, and belongs to the field of energy sources. The system consists of a heat pump system of a heat supply plant, a regional heat network, a water-water heat exchanger, a water chiller system, a hot water type heat pump system of a heating power station, a connecting pipeline and accessories.
Compared with the traditional centralized refrigeration, the method has the advantages that a large number of places are occupied for arranging the heat pump and newly building the cold water pipe network, the urban area is difficult to reform, the investment is large, the refrigeration conveying cold loss is large, the concentrated waste heat emission generated by refrigeration is not easy to diffuse, and the urban heat island effect is further aggravated. The invention has the main advantages that: compared with the traditional central heating which requires newly-built refrigeration stations and cold water pipe networks, the heat pump system is constructed by utilizing the existing heat pipe network and the heat supply plant inner space, saves the investment of occupied land and constructing the cold water pipe network system, and is easy to implement; the medium-temperature intermediate water is conveyed by the heating power pipe network, so that the conveying cooling loss can be further reduced, and the cooling range is enlarged; the heat pump system is built in the heat supply plant, so that the problem of occupation of land of a central refrigeration station is solved, waste heat generated by refrigeration is recycled to a large heat supply network for domestic hot water in all cities, the economical efficiency is improved, the use of fossil fuels is reduced, nitrogen oxides and carbon emission are reduced, the heat island effect of cities is reduced, the heat pump system can be used for recycling flue gas waste heat in winter, the utilization rate of equipment is improved, and the investment recovery period is reduced.
Fig. 1 is an overall architecture of a system for providing heat and cold by using a regional heating network according to the present invention, which includes:
a district heating network having one end connected to a heating plant and the other end connected to a user building, the district heating network comprising a high Wen Zhongjie water pipe containing high Wen Zhongjie water at 20 ℃ or more and a low temperature intermediate water pipe containing low temperature intermediate water at 15 ℃ or less;
the heat supply plant is internally provided with a heat pump integrated system, and the waste heat of intermediate water in the regional heat supply network is recovered to a heat supply large network so as to be used for domestic hot water in the whole market; wherein the temperature of the backwater of the heating large network is 50 ℃ or below, and the temperature of the water supply of the heating large network is 60 ℃ or above;
the user side water chiller is connected with an environment temperature adjusting pipeline, the environment temperature adjusting pipeline is arranged in a user area and absorbs heat in the user area into the environment temperature adjusting pipeline, and the user side water chiller is used for transferring the heat in the environment temperature adjusting pipeline into intermediate water of the area heat supply network so as to reduce the environment temperature in the user area;
the user side heat pump is connected with the environment temperature regulating pipeline, the environment temperature regulating pipeline provides heat for the user area, and the user side heat pump transfers heat in intermediate water of the area heat supply network into the environment temperature regulating pipeline so as to improve the environment temperature in the user area;
as described with reference to fig. 2, the system comprises a first user side valve 301 for connecting the water outlet of the user side chiller with the high temperature intermediate water pipe, a second user side valve 302 for connecting the water inlet of the user side chiller with the low temperature intermediate water pipe, a third user side valve 303 for connecting the water inlet of the user side heat pump with the high temperature intermediate water pipe, and a fourth user side valve 304 for connecting the water outlet of the user side heat pump with the low temperature intermediate water pipe. The valves are combined to control the intermediate water in the regional heating network to be input into the user side water chiller or the user side heat pump, and receive backwater discharged by the user side water chiller or the user side heat pump;
an ambient temperature sensor arranged in a public area in the user building for collecting the ambient temperature T in the user area e ；
Local heat net line temperature sensor, its settingIs arranged in a high-temperature intermediate water pipeline or a low-temperature intermediate water pipeline of the regional heating network and is used for collecting the water supply temperature T in the regional heating network pipeline s ；
A control unit electrically connected with the ambient temperature sensor and the regional heat network line temperature sensor and used for controlling the temperature according to the ambient temperature T e Said water supply temperature T s Setting the system in a heating state or a refrigerating state, adjusting the opening degree of each valve in the user side valve system, and correspondingly increasing or decreasing the ambient temperature in the user area to a set temperature range.
Referring to fig. 2, an area requiring heating or cooling within a user building is defined as a user area. The user building has various properties, and the user buildings with different properties have different temperature control requirement intensities, so that the user building corresponds to different pipeline heat energy coefficients Sigma R, and the Sigma R generally takes 20-80 km/kW. In general, the pipe heat energy coefficient Σr of a commercial building=80, the pipe heat energy coefficient Σr of a public building=60, and the pipe heat energy coefficient Σr of a residential building=20.
The control unit in the system is adapted to the different ambient temperature control requirements in accordance with the ambient temperature T by e Said water supply temperature T s Setting the system in a heating state or a refrigerating state, adjusting the opening degree of each valve in the valve system at the user side, and maintaining the comfort of the environmental temperature in the user area with the lowest energy consumption:
the first step, the ambient temperature T acquired by the ambient temperature sensor is acquired according to a set period e And the water supply temperature T acquired by the regional heat supply network line temperature sensor s At the ambient temperature T e Setting the system in a cooling state when the upper limit of the set temperature range is exceeded within a set period span; at the ambient temperature T s When the lower limit of the set temperature range is not reached in the period span exceeding the set period span, setting the system in a heating state;
in a refrigerating state, a cold water interface of the user side cold water machine is communicated with a water inlet of the environment temperature adjusting pipeline, a hot water interface of the user side cold water machine is communicated with a water outlet of the environment temperature adjusting pipeline, cold water is injected into the environment temperature adjusting pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area by the environment temperature adjusting pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced; in a heating state, a hot water interface of the user side heat pump is communicated with a water inlet of the environment temperature adjusting pipeline, a cold water interface of the user side heat pump is communicated with a water outlet of the environment temperature adjusting pipeline, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heating network to the hot water interface of the user side heat pump so as to be input into the environment temperature adjusting pipeline, so that the environment temperature in a user region is improved;
third step, according to the ambient temperature T e And the water supply temperature T s Calculating the variation of the opening degree of each valve in the user side valve system as follows
Wherein T is 0 A median representing the set temperature range; k (K) 0 An initial value representing the opening of the valve; sigma R represents the heat energy coefficient of the pipeline, and 20-80 km/kW is taken to determine a specific numerical value according to the type of a user building; l represents the total length of the pipeline in the regional heating network;
fourth, according to the change of the opening degree delta K, adjusting each valve: in a refrigeration state, the opening degree of a first user side valve 301 connecting the water outlet of the user side water chiller and the high temperature intermediate water pipeline and/or the opening degree of a second user side valve 302 connecting the water inlet of the user side water chiller and the low temperature intermediate water pipeline is increased according to the absolute value |delta K| of the variation of the opening degree; for example, the opening degree K is controlled to be increased by |Δk|% with respect to the current opening degree according to the amount of change in the opening degree;
in the refrigeration state, the opening of a third user side valve 303 connecting the user side heat pump water inlet and the high temperature intermediate water pipeline and/or the opening of a fourth user side valve 304 connecting the user side heat pump water outlet and the low temperature intermediate water pipeline are increased according to the variation delta K of the opening; for example, the opening degree K is controlled to be increased by Δk% with respect to the current opening degree by the amount of change Δk of the opening degree.
In order to fully utilize the existing regional heating network and increase the energy utilization efficiency, the system comprises: the user side water chiller and the user side heat pump are arranged near or in the user building. The user side water chiller and the user side heat pump share the same group of the environmental temperature regulating pipelines, wherein a water inlet of the environmental temperature regulating pipelines is connected with a cold water interface of the user side water chiller or a hot water interface of the user side heat pump through a first control valve 101, and a water outlet of the environmental temperature regulating pipelines is connected with a hot water interface of the user side water chiller or a cold water interface of the user side heat pump through a second control valve 201.
The first control valve is linked with the second control valve, in a heating state, the first control valve opens a hot water interface of the user side heat pump, meanwhile, the second control valve opens a cold water interface of the user side heat pump, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heating network to the hot water interface of the user side heat pump so as to be input into the environment temperature regulating pipeline, so that the environment temperature in a user region is improved; in a refrigeration state, the first control valve opens the cold water interface of the user side cold water machine, the second control valve opens the hot water interface of the user side cold water machine, the user side cold water machine injects cold water into the environment temperature regulating pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area through the environment temperature regulating pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced.
The heat supply plant is selectively arranged in an area far away from a user building, is connected with a plurality of regional heat supply networks, and is used for providing intermediate water for each regional heat supply network and recovering waste heat of the intermediate water in each regional heat supply network into a heat supply large network.
In order to improve the operation efficiency of the heat supply plant, referring to the gray part of fig. 3, in the present invention, the heat pump integrated system of the heat supply plant includes multiple stages of heat pumps connected in parallel, where each stage of heat pump is connected to a regional heat supply network, and a valve pipe network structure similar to the left side in fig. 3 may be specifically adopted. And each stage of heat pump respectively recovers the waste heat of intermediate water in the regional heat supply network connected with the heat pump into the heat supply large network.
The heat pump in the heat pump integrated system comprises any one or combination of an electric centrifugal heat pump, an electric screw compression heat pump or a direct combustion type absorption heat pump.
Specifically, in the above system, the period of sampling set by the ambient temperature sensor or the regional heat pipe line temperature sensor is at least sampling every hour; after each sampling, the system performs the first step to the 4 th step according to the data obtained by sampling, so as to adjust the opening of each valve in the valve system at the user side.
Therefore, the invention can realize refrigeration in summer and heating in winter through multiplexing the regional heating network, improves the energy conversion efficiency through the centralized heat supply and cold supply modes, and can be used for heating a large network and reducing the urban heat island effect through recovering the heat energy in the regional heating network.
The foregoing is a description of embodiments of the invention, which are specific and detailed, but are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (9)
1. A system for combined cooling and heating using a district heating network, comprising:
a district heating network having one end connected to a heating plant and the other end connected to a user building, the district heating network comprising a high Wen Zhongjie water pipe containing high Wen Zhongjie water at 20 ℃ or more and a low temperature intermediate water pipe containing low temperature intermediate water at 15 ℃ or less;
the heat supply plant is internally provided with a heat pump integrated system, and the waste heat of intermediate water in the regional heat supply network is recovered to a heat supply large network so as to be used for domestic hot water in the whole market; wherein the temperature of the backwater of the heating large network is 50 ℃ or below, and the temperature of the water supply of the heating large network is 60 ℃ or above;
the user side water chiller is connected with an environment temperature adjusting pipeline, the environment temperature adjusting pipeline is arranged in a user area and absorbs heat in the user area into the environment temperature adjusting pipeline, and the user side water chiller is used for transferring the heat in the environment temperature adjusting pipeline into intermediate water of the area heat supply network so as to reduce the environment temperature in the user area;
the user side heat pump is connected with the environment temperature regulating pipeline, the environment temperature regulating pipeline provides heat for the user area, and the user side heat pump transfers heat in intermediate water of the area heat supply network into the environment temperature regulating pipeline so as to improve the environment temperature in the user area;
the user side valve system comprises valves respectively connecting the high-temperature intermediate water pipeline, the low-temperature intermediate water pipeline, the water inlet and the water outlet of the user side water chiller, and the water inlet and the water outlet of the user side heat pump, and is used for controlling the intermediate water in the regional heating network to be input into the user side water chiller or the user side heat pump and receiving backwater discharged by the user side water chiller or the user side heat pump;
an ambient temperature sensor arranged in a public area in the user building for collecting the ambient temperature T in the user area e ；
The regional heat supply network line temperature sensor is arranged in a high-temperature intermediate water pipeline or a low-temperature intermediate water pipeline of the regional heat supply network and is used for collecting the water supply temperature T in the regional heat supply network line s ；
A control unit electrically connected with the ambient temperature sensor and the regional heat network line temperature sensor and used for controlling the temperature according to the ambient temperature T e And (C) aThe water supply temperature T s Setting the system in a heating state or a refrigerating state, and adjusting the opening of each valve in the user side valve system according to the following steps, so as to correspondingly increase or decrease the ambient temperature in the user area to a set temperature range:
the first step, the ambient temperature T acquired by the ambient temperature sensor is acquired according to a set period e And the water supply temperature T acquired by the regional heat supply network line temperature sensor s At the ambient temperature T e Setting the system in a cold state when the upper limit of the set temperature range is exceeded within a set cycle span; at the ambient temperature T e Setting the system in a heating state when the lower limit of the set temperature range is not reached within the set period span;
in a refrigerating state, a cold water interface of the user side cold water machine is communicated with a water inlet of the environment temperature adjusting pipeline, a hot water interface of the user side cold water machine is communicated with a water outlet of the environment temperature adjusting pipeline, cold water is injected into the environment temperature adjusting pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area by the environment temperature adjusting pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced; in a heating state, a hot water interface of the user side heat pump is communicated with a water inlet of the environment temperature adjusting pipeline, a cold water interface of the user side heat pump is communicated with a water outlet of the environment temperature adjusting pipeline, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heating network to the hot water interface of the user side heat pump so as to be input into the environment temperature adjusting pipeline, so that the environment temperature in a user region is improved;
third step, according to the ambient temperature T e And the water supply temperature T s Calculating the variation of the opening degree of each valve in the user side valve system as follows
Wherein T is 0 A median representing the set temperature range; k (K) 0 An initial value representing the opening of the valve; sigma R represents the heat energy coefficient of the pipeline, 20-80 km/kW is taken, and a specific numerical value is determined by the type of a user building; l represents the total length of the pipeline in the regional heating network;
fourth, according to the change of the opening degree delta K, adjusting each valve: in a refrigeration state, the opening degree of a first user side valve (301) connected with the water outlet of the user side water chiller and the high temperature intermediate water pipeline and/or the opening degree of a second user side valve (302) connected with the water inlet of the user side water chiller and the low temperature intermediate water pipeline is increased according to the absolute value |delta K| of the variation of the opening degree; in a heating state, the opening degree of a third user side valve (303) connected with the user side heat pump water inlet and the high temperature intermediate water pipeline and/or the opening degree of a fourth user side valve (304) connected with the user side heat pump water outlet and the low temperature intermediate water pipeline is increased according to the variation delta K of the opening degree.
2. The system for combined cooling and heating by using a district heating network according to claim 1, wherein the user side water chiller and the user side heat pump are both arranged near or in a user building;
the user side water chiller and the user side heat pump share the same group of environment temperature regulating pipelines, wherein a water inlet of the environment temperature regulating pipelines is connected with a cold water interface of the user side water chiller or a hot water interface of the user side heat pump through a first control valve (101), and a water outlet of the environment temperature regulating pipelines is connected with a hot water interface of the user side water chiller or a cold water interface of the user side heat pump through a second control valve (201); the first control valve is linked with the second control valve, in a heating state, the first control valve opens a hot water interface of the user side heat pump, meanwhile, the second control valve opens a cold water interface of the user side heat pump, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heating network to the hot water interface of the user side heat pump so as to be input into the environment temperature regulating pipeline, so that the environment temperature in a user region is improved; in a refrigeration state, the first control valve opens the cold water interface of the user side cold water machine, the second control valve opens the hot water interface of the user side cold water machine, the user side cold water machine injects cold water into the environment temperature regulating pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area through the environment temperature regulating pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced.
3. The system for combined cooling and heating using district heating networks according to claim 1, wherein the heating plant is disposed in a district far from a user's building, is connected to a plurality of district heating networks, and is used for supplying intermediate water to each district heating network, and recovering waste heat of the intermediate water in each district heating network to a heating large network.
4. A system for combined cooling and heating by using a district heating network as claimed in claim 3, wherein the heat pump integrated system of the heating plant comprises a plurality of stages of heat pumps connected in parallel, each stage of heat pump is respectively connected with one district heating network, and each stage of heat pump respectively recovers the waste heat of intermediate water in the district heating network connected with each stage of heat pump into a heating large network.
5. The system for combined cooling and heating using a district heating network according to claim 4, wherein the heat pump in the heat pump integrated system comprises any one or combination of an electric centrifugal heat pump, an electric screw compression heat pump, or a direct-fired absorption heat pump.
6. A control method for the system for combined cooling and heating using a district heating network according to any one of claims 1 to 5, characterized by comprising the steps of:
the first step, the ambient temperature T acquired by the ambient temperature sensor is acquired according to a set period e And the regional heat net pipe line temperature sensorIs set at the water supply temperature T s At the ambient temperature T e Setting the system in a cold state when the upper limit of the set temperature range is exceeded within a set cycle span; at the ambient temperature T e Setting the system in a heating state when the lower limit of the set temperature range is not reached within the set period span;
in a refrigerating state, a cold water interface of the user side cold water machine is communicated with a water inlet of the environment temperature adjusting pipeline, a hot water interface of the user side cold water machine is communicated with a water outlet of the environment temperature adjusting pipeline, cold water is injected into the environment temperature adjusting pipeline through the cold water interface of the user side cold water machine, and heat obtained by absorbing the environment temperature in a user area by the environment temperature adjusting pipeline is transferred into a high Wen Zhongjie water pipeline in the regional heating network, so that the environment temperature in the user area is reduced; in a heating state, a hot water interface of the user side heat pump is communicated with a water inlet of the environment temperature adjusting pipeline, a cold water interface of the user side heat pump is communicated with a water outlet of the environment temperature adjusting pipeline, and the user side heat pump transfers heat in a high Wen Zhongjie water pipeline in the regional heating network to the hot water interface of the user side heat pump so as to be input into the environment temperature adjusting pipeline, so that the environment temperature in a user region is improved;
third step, according to the ambient temperature T e And the water supply temperature T s Calculating the variation delta K of the opening degree of each valve in the valve system of the user side;
fourth, according to the change of the opening degree delta K, adjusting each valve:
in a refrigeration state, the opening of a first user side valve (301) connected with the water outlet of the user side water chiller and the high-temperature intermediate water pipeline and/or the opening of a second user side valve (302) connected with the water inlet of the user side water chiller and the low-temperature intermediate water pipeline are increased by |delta K|% relative to the current opening according to the change amount of the opening;
in a heating state, the opening of a third user side valve (303) connected with the user side heat pump water inlet and the high temperature intermediate water pipeline and/or the opening of a fourth user side valve (304) connected with the user side heat pump water outlet and the low temperature intermediate water pipeline is increased by delta K% relative to the current opening according to the variation delta K of the opening.
7. The control method according to claim 6, wherein the amount of change in the opening degree of each valve is calculated as follows:
wherein T is 0 A median representing the set temperature range; k (K) 0 An initial value representing the opening of the valve; sigma R represents the heat energy coefficient of the pipeline, 20-80 km/kW is taken, the concrete value is determined by the intensity of the temperature control requirement of a user building, the heat energy coefficient of the pipeline of a commercial building is larger than that of a public building, and the heat energy coefficient of the pipeline of the public building is larger than that of a residential building; l represents the total length of the pipeline in the district heating network, in km.
8. The control method of claim 7, wherein the period of sampling set by the ambient temperature sensor or the regional subnet wire temperature sensor is at least sampling every hour; and after each sampling, regulating the opening of each valve in the valve system at the user side according to the first step to the 4 th step.
9. The control method of claim 8, wherein the set period spans at least 12 hours.
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| JPS61276639A (en) * | 1985-05-31 | 1986-12-06 | Matsushita Electric Ind Co Ltd | Cooling, heating and hot-water supply equipment |
| CN103968598A (en) * | 2013-01-24 | 2014-08-06 | 盾安（天津）节能系统有限公司 | Large temperature difference centralized heating/cooling system |
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