Method and system for measuring height of thermocline of heat storage tank
阅读说明：本技术 一种用于测量储热罐斜温层高度的方法及系统 (Method and system for measuring height of thermocline of heat storage tank ) 是由 吴德春 周旭哲 李建朋 张翼彩 于 2019-08-20 设计创作，主要内容包括：本发明涉及一种用于测量储热罐斜温层高度的方法及系统,其中该系统包括储热罐及计算装置,储热罐包括储热罐罐体,储热罐罐体内部的热水空间及冷水空间分别布置有上部布水器及下部布水器；沿储热罐罐体高度方向设有多个温度测点,每个温度测点布置一个测温元件,用于测取不同标高液体的温度；热水空间与冷水空间在交界面形成斜温层；上部布水器及下部布水器分别连接有热水管道和冷水管道,热水管道和/或冷水管道安装有流量计；计算装置用于基于获取的斜温层通过温度测点的时间及对应流量,连续计算斜温层经过各个温度测点时的厚度。本发明能够准确测量斜温层高度,提供储热罐指标计算和性能考核依据。(The invention relates to a method and a system for measuring the height of a thermocline of a heat storage tank, wherein the system comprises the heat storage tank and a computing device, the heat storage tank comprises a heat storage tank body, and a hot water space and a cold water space in the heat storage tank body are respectively provided with an upper water distributor and a lower water distributor; a plurality of temperature measuring points are arranged along the height direction of the heat storage tank body, and each temperature measuring point is provided with a temperature measuring element for measuring the temperature of liquid with different elevations; the hot water space and the cold water space form a temperature gradient layer at an interface; the upper water distributor and the lower water distributor are respectively connected with a hot water pipeline and a cold water pipeline, and the hot water pipeline and/or the cold water pipeline are/is provided with a flowmeter; and the calculating device is used for continuously calculating the thickness of the thermocline passing through each temperature measuring point based on the acquired time and the corresponding flow rate of the thermocline passing through the temperature measuring points. The invention can accurately measure the height of the thermocline and provide index calculation and performance assessment basis for the heat storage tank.)
1. A method for measuring a thermal storage tank thermocline height, comprising:
based on the time and the corresponding flow of the thermocline of the heat storage tank passing through the temperature measuring points, the thickness of the thermocline passing through each temperature measuring point is continuously calculated, and the calculation formula is as follows:
in the formula: h isnThe thickness of the thermocline layer passes through the nth temperature measuring point, and the unit is m;
Qnthe flow of the inclined temperature layer passing through the nth temperature measuring point is measured in m3/h；
Delta t is the time of the thermocline passing through the nth temperature measuring point, and the unit is s;
r is the heat storage tank radius in m.
2. The system for measuring the height of the thermocline of the heat storage tank is characterized by comprising the heat storage tank and a computing device, wherein the heat storage tank comprises a heat storage tank body, an upper water distributor and a lower water distributor are respectively arranged in a hot water space and a cold water space inside the heat storage tank body, and the upper water distributor and the lower water distributor are used for uniformly spraying transmitted liquid at the elevations where the upper water distributor and the lower water distributor are located; a plurality of temperature measuring points are arranged along the height direction of the heat storage tank body, and each temperature measuring point is provided with a temperature measuring element for measuring the temperature of liquid with different elevations;
the hot water space is positioned in the upper area of the heat storage tank body, the cold water space is positioned in the lower area of the heat storage tank body, and an inclined temperature layer is formed on the interface of the hot water space and the cold water space; the upper water distributor and the lower water distributor are respectively connected with a hot water pipeline and a cold water pipeline, and the hot water pipeline and/or the cold water pipeline are/is provided with a flowmeter;
the calculating device is used for continuously calculating the thickness of the thermocline passing through each temperature measuring point based on the acquired time and the corresponding flow of the thermocline passing through the temperature measuring point, and the calculation formula is as follows:
in the formula: h isnThe thickness of the thermocline layer passing through the nth temperature measuring point is m;
Qnthe flow of the inclined temperature layer passing through the nth temperature measuring point is measured in m3/h；
Delta t is the time of the thermocline passing through the nth temperature measuring point, and the unit is s;
r is the heat storage tank radius in m.
3. The system for measuring the thermocline height of the heat storage tank as claimed in claim 2, wherein in the heat storage stage, hot water is supplied to the hot water space inside the heat storage tank body through the hot water pipeline, and cold water in the cold water space inside the heat storage tank body is sent out through the cold water pipeline; and in the heat release stage, the hot water in the hot water space in the heat storage tank body is sent to the hot water pipeline, and the cold water space in the heat storage tank body is supplemented with cold water through the cold water pipeline.
4. The system according to claim 3, wherein a circulation pump and a bypass valve are installed on the hot water pipeline and the cold water pipeline, and the circulation pump and the bypass valve are used for adjusting the flow of the hot water and the cold water entering and exiting the heat storage tank body during the heat storage or heat release period of the heat storage tank, so that the flow of the cold water and the hot water entering and exiting the heat storage tank body is consistent, and the liquid level inside the heat storage tank body is kept constant.
5. The system for measuring the height of the thermocline of the thermal storage tank as claimed in claim 2, wherein the temperature measuring elements are vertically arranged or spirally arranged along the height direction of the thermal storage tank body.
6. The system for measuring the thermocline height of the heat storage tank as claimed in claim 2, wherein a steam or nitrogen pressure stabilizer is arranged on the top of the tank body of the heat storage tank.
7. The system for measuring the thermocline height of the heat storage tank as claimed in claim 2, wherein the upper part of the tank body of the heat storage tank is provided with an overflow port.
8. The system for measuring the thermocline height of the heat storage tank as claimed in claim 2, wherein a breather valve is arranged on the top of the tank body of the heat storage tank.
Technical Field
The invention belongs to the technical field of heat storage tank thermocline measurement, and particularly relates to a method and a system for measuring the height of a thermocline of a heat storage tank.
Background
The heat storage technology aims at solving the contradiction generated by mismatching of energy supply and demand parties in time and space, the energy is stored in an energy surplus stage through the heat storage device and is released in an energy shortage period, the fluctuation of an energy generation system caused by external load requirements is reduced, the energy utilization efficiency is improved, and the heat storage device is an important technology for reducing the environmental pollution. The heat storage system is widely applied to the fields of solar energy storage, electric power peak regulation, waste heat and waste heat recycling, energy conservation of industrial and civil buildings and air conditioners and the like.
The main principle of the hot water heat storage tank is that the sensible heat of water is utilized to store heat, and the layering characteristic of water at different temperatures is utilized, namely when the temperature is high, the density of hot water is low, and the hot water is positioned in the upper area of the heat storage tank under the action of buoyancy; the cold water with low temperature is in the lower area of the heat storage tank due to high density, so that the cold water and the hot water are naturally layered, and the stable inclined temperature layer prevents the cold water at the lower part and the hot water at the upper part from being mixed with each other. By using the heat storage tank, when the external heat load is low, the surplus and temporarily unnecessary energy is stored in the specific heat storage device, and when the external heat load is high and the output of the heat supply device is insufficient, the stored energy is released.
Because the cold and hot water in the heat storage tank forms the thermocline at the interface, the thickness of the thermocline directly influences the effective volume of the heat storage tank, and if the thermocline is too large, the heat storage quantity and the heat release quantity of the heat storage tank are inevitably reduced. The thermocline continuously moves along with the time in the use process of the heat storage tank, the thickness of the thermocline also changes, and the conventional measuring tool and means cannot accurately measure the thermocline.
Disclosure of Invention
The invention aims to provide a method and a system for measuring the height of an inclined temperature layer of a heat storage tank, so that the thickness of the inclined temperature layer is measured on line in the heat storage and release processes of the hot water heat storage tank, a performance calculation basis is provided, and references are provided for flow and temperature control in the heat storage and release processes.
The invention provides a method for measuring the height of a thermocline of a heat storage tank, which comprises the following steps:
based on the time and the corresponding flow of the thermocline of the heat storage tank passing through the temperature measuring points, the thickness of the thermocline passing through each temperature measuring point is continuously calculated, and the calculation formula is as follows:
in the formula: h isnThe thickness of the thermocline layer passes through the nth temperature measuring point, and the unit is m;
Qnthe flow of the thermocline passing through the nth temperature measuring point is measured in
delta t is the time of the thermocline passing through the nth temperature measuring point, and the unit is s;
r is the heat storage tank radius in m.
The invention also provides a system for measuring the height of the inclined temperature layer of the heat storage tank, which comprises the heat storage tank and a computing device, wherein the heat storage tank comprises a heat storage tank body, an upper water distributor and a lower water distributor are respectively arranged in a hot water space and a cold water space in the heat storage tank body, and the upper water distributor and the lower water distributor are used for uniformly spraying transmitted liquid at the elevations where the upper water distributor and the lower water distributor are located; a plurality of temperature measuring points are arranged along the height direction of the heat storage tank body, and each temperature measuring point is provided with a temperature measuring element for measuring the temperature of liquid with different elevations;
the hot water space is positioned in the upper area of the heat storage tank body, the cold water space is positioned in the lower area of the heat storage tank body, and an inclined temperature layer is formed on the interface of the hot water space and the cold water space; the upper water distributor and the lower water distributor are respectively connected with a hot water pipeline and a cold water pipeline, and the hot water pipeline and/or the cold water pipeline are/is provided with a flowmeter;
the calculating device is used for continuously calculating the thickness of the thermocline passing through each temperature measuring point based on the acquired time and the corresponding flow of the thermocline passing through the temperature measuring point, and the calculation formula is as follows:
in the formula: h isnThe thickness of the thermocline layer passing through the nth temperature measuring point is m;
Qnthe flow of the inclined temperature layer is measured through the nth temperature measuring
delta t is the time of the thermocline passing through the nth temperature measuring point, and the unit is s;
r is the heat storage tank radius in m.
Furthermore, in the heat storage stage, hot water is supplemented to the hot water space in the heat storage tank body through a hot water pipeline, and cold water in the cold water space in the heat storage tank body is sent out through a cold water pipeline; in the heat release stage, hot water in a hot water space inside the heat storage tank body is sent to a hot water pipeline, and cold water is supplemented to a cold water space inside the heat storage tank body through a cold water pipeline.
Furthermore, a circulating pump and a bypass valve are arranged on the hot water pipeline and the cold water pipeline, and the circulating pump and the bypass valve are used for adjusting the flow of the hot water and the cold water entering and exiting the heat storage tank body in the heat storage or heat release period of the heat storage tank, so that the flow of the cold water and the hot water entering and exiting the heat storage tank body is consistent, and the liquid level in the heat storage tank body is kept unchanged.
Further, the temperature measuring elements are vertically arranged or spirally arranged along the height direction of the heat storage tank body.
Further, a steam or nitrogen pressure stabilizing device is arranged at the top of the heat storage tank body.
Further, the upper part of the heat storage tank body is provided with an overflow port.
Further, the top of the heat storage tank body is provided with a breather valve.
By means of the scheme, the method and the system for measuring the height of the thermocline of the heat storage tank can accurately measure the height of the thermocline, and index calculation and performance assessment basis of the heat storage tank are provided. Through continuous measurement thermocline height variation trend, in time adjust heat-retaining system operating parameter, can avoid the thermocline increase to lead to effective volume to reduce, improve equipment utilization.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a system for measuring the height of a thermocline of a thermal storage tank according to the present invention.
Reference numbers in the figures:
1-a heat storage tank body; 2-upper water distributor; 3-a hot water space; 4-thermocline; 5-a temperature measuring element; 6-lower water distributor; 7-cold water space; 8-a flow meter; 9-a circulating pump; 10-a bypass valve; 11-a cold water pipe; 12-hot water pipe.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The embodiment provides a method for measuring the height of a thermocline of a heat storage tank, which comprises the following steps:
based on the time and the corresponding flow of the thermocline of the heat storage tank passing through the temperature measuring points, the thickness of the thermocline passing through each temperature measuring point is continuously calculated, and the calculation formula is as follows:
in the formula: h isnThe thickness of the thermocline layer passes through the nth temperature measuring point, and the unit is m;
Qnthe flow of the thermocline passing through the nth temperature measuring point is measured in
delta t is the time of the thermocline passing through the nth temperature measuring point, and the unit is s;
r is the heat storage tank radius in m.
The method for measuring the height of the thermocline of the heat storage tank can measure the thickness of the thermocline and provide index calculation and performance assessment basis for the heat storage tank. Through continuous measurement thermocline thickness variation trend, in time adjust heat-retaining system operating parameter, can avoid thermocline thickness increase to lead to effective volume to reduce, improve equipment utilization.
Referring to fig. 1, the system for measuring the height of the inclined temperature layer of the heat storage tank comprises the heat storage tank and a computing device, the heat storage tank comprises a heat storage tank body 1, an upper water distributor 2 and a
The
The calculating device is used for continuously calculating the thickness of the thermocline passing through each temperature measuring point based on the acquired time and the corresponding flow of the thermocline passing through the temperature measuring point, and the calculation formula is as follows:
in the formula: h isnThe thickness of the thermocline layer passing through the nth temperature measuring point is m;
Qnthe flow of the thermocline passing through the nth temperature measuring point is measured in
delta t is the time of the thermocline passing through the nth temperature measuring point, and the unit is s;
r is the heat storage tank radius in m.
Through the system for measuring the height of the thermocline of the heat storage tank, the thickness of the thermocline can be measured, and index calculation and performance assessment basis of the heat storage tank are provided. Through continuous measurement thermocline thickness variation trend, in time adjust heat-retaining system operating parameter, can avoid thermocline thickness increase to lead to effective volume to reduce, improve equipment utilization.
In the embodiment, in the heat storage stage, hot water is supplemented to the
In this embodiment, the hot water pipe 11 and the
In the embodiment, the
In this embodiment, heat storage tank jar body 1 top is equipped with steam or nitrogen gas voltage regulator device, guarantees jar body top pressure-fired, avoids the outside air to get into jar body and produces the corruption to the jar body.
In this embodiment, heat storage tank body 1 upper portion is equipped with the overflow mouth, prevents that the internal liquid level of jar is too high.
In this embodiment, 1 top of the heat storage tank body is equipped with the breather valve, prevents that great malleation or negative pressure from appearing in the internal portion of jar from damaging the jar body.
The method and the system for measuring the height of the thermocline of the heat storage tank have the following technical effects:
1) the problem that the liquid height is difficult to measure when the thermocline moves in the operation period of the heat storage tank in the traditional method is solved;
2) the output result can be used as the heat storage equipment and system assessment basis;
3) parameters such as water inlet and outlet flow and water temperature of the heat storage tank can be adjusted in time through the thickness variation trend of the thermocline, and the reduction of the effective space of the heat storage tank is avoided.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
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