CN201828043U - Heat collection, storage and supply integrated slotted solar energy medium and high temperature heat utilization device - Google Patents

Abstract

A trough-type solar medium-high temperature heat utilization device integrating heat collection, heat storage and heat supply can greatly simplify the heat absorption, heat storage and heat supply systems in trough-type solar medium-high temperature heat utilization systems such as solar thermal power generation. The device is composed of the following main components: heat supply pipe 1, heat absorption surface 2, heat storage layer 3 and trough-type concentrator 4; From outside to inside, there are heat absorbing surface, heat storage layer and heat supply pipe; the heat storage material in the heat storage layer is molten salt or aluminum-silicon alloy; the heat fluid in the heat supply pipe is air, water, water vapor or heat transfer oil The trough concentrator adopts a single-axis tracking method to gather the solar radiation on the heat-absorbing surface at the bottom of the heat storage layer, and the absorbed heat heats the heat storage material in the heat storage layer, and the heat storage material heats the heat flowing through the heat supply pipe. The thermal fluid supplies heat to the outside.

Description

Heat collection, heat storage and heat supply integrated trough solar medium and high temperature heat utilization device

Technical field The present invention relates to a solar heat utilization device, in particular to a trough-type solar medium-high temperature heat utilization device integrating heat collection, heat storage and heat supply.

Background technology In order to overcome the intermittency caused by weather changes in the process of solar thermal utilization, realize continuous heating around the clock, and utilize solar energy to the greatest extent, concentrating solar thermal utilization devices are generally equipped with energy storage systems, which save excess energy when the solar radiation is strong during the day. The heat is stored and released at night when needed, thereby improving the overall utilization of solar energy and its equipment. At present, there are mainly two energy storage methods used in trough-type concentrating solar thermal power generation devices: 1) double-box energy storage method, that is, a hot box and a cold box to store heat. When storing energy, the energy storage medium in the cold box absorbs heat and stores it in the hot box, and releases the heat when needed before returning to the cold box; double-box energy storage requires two energy storage boxes, and the energy storage medium also increases accordingly. This leads to an increase in the initial investment of the system and a higher cost of power generation.

2) Single-box energy storage method, in order to reduce power generation costs and improve the competitiveness of solar thermal power generation, a single-box energy storage method has been developed on the basis of double boxes. Single-box energy storage is also called thermocline energy storage, that is, there is only one energy storage box, and the hot and cold fluids in the box are separated by a thermocline layer with a small thickness but a large temperature gradient. The hot fluid above gradually increases, the cold fluid below gradually decreases, and the opposite is true when releasing heat.

Regardless of the double-box or single-box energy storage method, it is necessary to transfer heat from the heat collector to the energy storage medium in the energy storage container through the thermal fluid first; if the thermal fluid and the energy storage medium are not the same substance, then an intermediate is required Heat exchanger; then when raising the heat, it is necessary to transfer the heat from the heat storage container to the steam boiler through the heat raising medium. Therefore, the current solar thermal power generation system requires many devices, and the pipelines connecting these devices are relatively complicated, which eventually leads to difficulties in the popularization and use of this technology.

In addition to solar thermal power generation, a large number of medium and high temperature heat sources are also required in the industrial production process. This is especially true for solar heat utilization devices that integrate heat collection, heat storage and heat supply, especially heat collection and heat storage that involve solar energy medium and high temperature heat utilization. A compact device that integrates heating and heating has put forward a realistic demand.

SUMMARY OF THE INVENTION A solar heat utilization device integrating heat collection, heat storage, and heat supply, which is intended to be used for solar energy medium and high temperature heat utilization, can greatly simplify the system composition of trough solar energy medium and high temperature heat utilization devices such as solar thermal power generation and reduce its cost. The device is composed of a trough-type concentrator, a heat-absorbing surface, a heat storage layer and a heat supply pipe; Heat storage layer and heat supply pipe; the heat storage material in the heat storage layer is molten salt or aluminum-silicon alloy; the thermal fluid in the heat supply pipe is air, water, water vapor or heat transfer oil.

The energy transfer process of the device is as follows: the trough-type concentrator reflects solar radiation to the heat-absorbing surface located outside the bottom of the heat storage layer, the absorbed heat heats the heat storage material in the heat storage layer, and the heat storage material heats and flows through the heat supply pipe The thermal fluid supplies heat to the outside. The heating temperature of the equipment is 100-500°C, the highest energy storage density can reach 2000MJ/m ³ , and the thermal efficiency can reach 90-95% according to the storage energy size and heating type. It has the advantages of small size, high efficiency, long life and Good value for money.

Compared with known technology, the present invention has advantages and positive effects:

(1) Compact structure and convenient processing;

(2) The working conditions can be adjusted, and one machine can be used for multiple purposes;

(3) The series-parallel connection mode of the device can be flexibly adjusted to meet the needs of heating temperature and flow.

BRIEF DESCRIPTION OF THE DRAWINGS The attached figure is a schematic diagram of a trough-type solar medium-high temperature heat utilization device integrating heat collection, heat storage and heat supply. It can be seen from the figure that the device is composed of the following main components: heat supply pipe 1, heat absorption surface 2, heat storage layer 3 and trough condenser mirror 4; heat absorption surface, heat storage layer and heat supply pipe are concentrically arranged Drum-shaped structure, from the outside to the inside is the heat absorption surface, heat storage layer and heat supply pipe; the heat storage material in the heat storage layer is molten salt or aluminum-silicon alloy; the heat fluid in the heat supply pipe is air, water , water vapor or heat-conducting oil; the trough-type concentrator adopts a single-axis tracking method to always gather solar radiation on the heat-absorbing surface at the bottom of the heat storage layer, and the absorbed heat heats the heat storage material in the heat storage layer, and the heat storage material heats up The thermal fluid flowing through the heat supply pipe supplies heat to the outside.

Detailed ways

Example 1: Using molten salt as an energy storage material, design, process and install a trough-type solar medium-high temperature heat utilization device integrating heat collection, heat storage and heat supply according to the key points in the description of the attached drawings. The thermal capacity is equivalent to 35.5kWh. The device is composed of the following main components: heat supply pipe 1, heat absorption surface 2, heat storage layer 3 and trough-type concentrator 4; From the outside to the inside, there are heat absorbing surface, heat storage layer and heat supply pipe; the heat storage material in the heat storage layer is molten salt; the thermal fluid in the heat supply pipe is air; Radiation always gathers on the heat-absorbing surface at the bottom of the heat storage layer, and the absorbed heat heats the molten salt in the heat storage layer, and the molten salt heats the air flowing through the heat supply pipe to supply heat to the outside. The device uses a trough concentrator with a concentration ratio of 12 times and a concentration area of 15m ² , and the molten salt is heated to 336°C after irradiation for about 5.5 hours. The heating power of the device is 2.5-4.0kW, and it can continuously supply high-temperature air at a flow rate of 1000 liters per minute for 11 hours at a temperature rise of 200°C. Running tests show that the thermal efficiency of the device reaches 88.5%.

Embodiment 2: Using molten salt as an energy storage material, design, process and install according to the key points described in the accompanying drawings to form a trough-type solar energy medium and high temperature heat utilization device integrating heat collection, heat storage and heat supply. The thermal capacity is equivalent to 52kWh. The device is composed of the following main components: heat supply pipe 1, heat absorption surface 2, heat storage layer 3 and trough-type concentrator 4; From the outside to the inside, there are heat absorbing surface, heat storage layer and heat supply pipe; the heat storage material in the heat storage layer is molten salt; the thermal fluid in the heat supply pipe is water; Radiation always gathers on the heat-absorbing surface at the bottom of the heat storage layer, and the absorbed heat heats the molten salt in the heat storage layer, and the molten salt heats the water flowing through the heat supply pipe to supply heat to the outside. The device uses a trough concentrator with a concentration ratio of 16 times and a concentration area of 20m ² , and the molten salt is heated to 356°C after irradiation for about 6 hours. The heating power of the device is 35-45kW, and it can continuously supply high-temperature hot water for 1.6 hours at a flow rate of 5-10 liters per minute when the water temperature rises at 125°C. Running tests show that the thermal efficiency of the device reaches 90.5%.

Embodiment 3: Using aluminum-silicon alloy as energy storage material, design, process and install according to the key points described in the accompanying drawings to form a trough-type solar medium-high temperature heat utilization device integrating heat collection, heat storage and heat supply. The heat storage capacity is equivalent to 103kWh. The device is composed of the following main components: heat supply pipe 1, heat absorption surface 2, heat storage layer 3 and trough-type concentrator 4; From the outside to the inside, there are heat absorbing surface, heat storage layer and heat supply pipe; the heat storage material in the heat storage layer is aluminum-silicon alloy; the thermal fluid in the heat supply pipe is heat transfer oil; the trough condenser adopts a single-axis tracking method, The solar radiation is always concentrated on the heat-absorbing surface at the bottom of the heat storage layer, and the absorbed heat heats the aluminum-silicon alloy in the heat storage layer, and the aluminum-silicon alloy heats the heat transfer oil flowing through the heat supply pipe to supply heat to the outside. The device uses a trough concentrator with a concentration ratio of 24 times and a concentration area of 35m ² , and the aluminum-silicon alloy is heated and melted to 606°C after irradiation for about 6.5 hours. The heating power of the device is 80-91kW, and it can continuously supply high-temperature heat-transfer oil for 1.5 hours at a flow rate of 6-8 liters/minute when the temperature rise of the heat-transfer oil is 225°C. Running tests show that the thermal efficiency of the device reaches 92.5%.

Embodiment 4: Using aluminum-silicon alloy as energy storage material, design, process and install according to the key points described in the accompanying drawings to form a trough-type solar medium-high temperature heat utilization device integrating heat collection, heat storage and heat supply. The heat storage capacity is equivalent to 196kWh. The device is composed of the following main components: heat supply pipe 1, heat absorption surface 2, heat storage layer 3 and trough-type concentrator 4; From the outside to the inside, there are heat absorbing surface, heat storage layer and heat supply pipe; the heat storage material in the heat storage layer is aluminum-silicon alloy; the thermal fluid in the heat supply pipe is steam; Solar radiation always gathers on the heat-absorbing surface at the bottom of the heat storage layer, and the absorbed heat heats the aluminum-silicon alloy in the heat storage layer, and the aluminum-silicon alloy heats the steam flowing through the heat supply pipe to supply heat to the outside. The device uses a trough concentrator with a concentration ratio of 24 times and a concentration area of 52m ² , and the aluminum-silicon alloy is heated and melted to 601°C after irradiation for about 7.5 hours. The heating power of the device is 40-53kW, and it can continuously supply high-temperature and high-pressure steam at a flow rate of 25-30 liters/minute for 4.5 hours. Running tests show that the thermal efficiency of the device reaches 93.8%.

Claims (3)

1. elevated temperature heat use device in the integrated groove type solar of thermal-arrest, heat accumulation and heat supply, form by slot light collection mirror, heat-absorbent surface, reservoir and heating tube, it is characterized in that: heat-absorbent surface, reservoir and heating tube are the drum-shaped structure of arranged concentric, are followed successively by heat-absorbent surface, reservoir and heating tube from outside to inside.

2. elevated temperature heat use device in thermal-arrest according to claim 1, heat accumulation and the integrated groove type solar of heat supply is characterized in that: the heat accumulating in the reservoir is fused salt or alusil alloy.

3. elevated temperature heat use device in thermal-arrest according to claim 1, heat accumulation and the integrated groove type solar of heat supply is characterized in that: the hot fluid in the heating tube is air, water, steam or conduction oil.