CN102980308B - All-weather solar-powered grooved heat collecting and electric heating coupled system - Google Patents

Abstract

The invention provides an all-weather solar trough heat collection and electric heating coupling system, which includes a solar trough heat collection area, an electric heating area, a high temperature reaction area and a system control area. Driven by the fan, the purified cold air is pumped into the solar vacuum heat collecting tube, and under the action of the solar trough heat collecting plate, the air is heated rapidly. If the temperature of the heated air reaches the temperature required by the high temperature reaction zone, it will be directly used For high-temperature reactions, if the air temperature after heating is lower than the required temperature in the high-temperature reaction zone, an air heater is required to make up for the temperature difference, so as to form a constant medium-high temperature temperature field in the high-temperature reaction zone. The effect of the invention is that the high-temperature thermal field can be used for mesoscopic separation of brine and mesoscopic drying of surplus sludge. Under the coupling control of the solar trough heat collecting area and the electric heating area, the system can provide hot air in the range of 100°C-400°C required by the high-temperature reaction area around the clock, with a flow rate of 50m ³ /h-600m ³ /h air heat field.

Description

All-weather solar trough heat collection and electric heating coupling system

technical field

The invention relates to a heat supply system, in particular to a medium-high temperature all-weather solar trough heat collection and electric heating coupling system. The invention is a heating and heating system not affected by the weather. The system can provide a constant medium-high temperature air heat field and can be applied to the mesoscopic separation of brine and the mesoscopic drying of excess sludge.

Background technique

Energy shortage is a very serious problem facing the world. As a clean and pollution-free new energy source, solar energy has a very broad development prospect. With the research on the large-scale development and utilization of solar energy, it is found that the daylighting rate and The light-to-heat conversion rate is low; the use of solar automatic tracker can make the solar lighting panel always perpendicular to the sunlight, and maintain the maximum light energy collection rate and heat accumulation rate.

Solar concentrating heating technology is a relatively mature solar energy utilization technology, but due to the limitation of meteorological conditions, solar concentrating heating technology has the disadvantages of unstable temperature and easy loss, which limits the application of solar concentrating heating technology. Industrial application. Electric heating technology has a stable heating mode, but because of its high energy consumption, it is difficult to apply it in actual production on a large scale. The invention integrates the advantages of the solar heat collection technology and the electric heating technology, and couples the two together, aiming to provide a stable medium-high temperature thermal field around the clock.

Contents of the invention

In order to solve the problems existing in the above technologies, the present invention provides an all-weather solar trough heat collection and electric heating coupling system, which organically couples solar trough heat collection devices, sunlight automatic tracking technology and electric heating technology together , which not only improves the utilization rate of solar energy and maximizes the utilization of natural energy, but also provides a stable medium-high temperature air thermal field around the clock.

In order to achieve the above purpose, the present invention needs to provide an all-weather solar trough heat collection and electric heating coupling system, wherein: the system includes a solar trough heat collection area, an electric heating area, a high temperature reaction area, and a system control area. Driven by the fan, the purified cold air is pumped into the solar vacuum heat collecting tube, and under the action of the solar trough heat collecting plate, the air is heated rapidly. If the temperature of the heated air reaches the temperature required by the high temperature reaction zone, it will be directly used For high-temperature reactions, if the air temperature after heating is lower than the required temperature in the high-temperature reaction zone, an air heater is required to make up for the temperature difference, so as to form a constant medium-high temperature temperature field in the high-temperature reaction zone.

The solar vacuum heat collecting tube in the solar trough heat collecting area is fixed on the central axis of the groove of the solar trough heat collecting plate, and a solar automatic tracker is arranged on the fixed shaft on the back of the solar trough heat collecting plate. The cold air enters the solar heat collection vacuum tube through the air pump and air purifier, and the air heated by the solar energy is transported to the high temperature reaction area by the heat preservation tube. A temperature sensor is installed at the inlet end of the high-temperature reaction zone. If the air temperature does not reach the required temperature of the high-temperature reaction zone, the air heater in the electric heating zone will heat the air out of the solar energy to continue to heat up to the required temperature. In this way, a medium-high temperature all-weather solar trough heat collection and electric heating coupling system is formed. The system control area controls the working state of the system through the adjustment device of the system control panel. The high-temperature reaction area can provide a high-temperature reaction heat field for salt water mesoscopic observation. Applications such as separation and excess sludge drying.

The solar trough-type heat collecting area includes a solar vacuum heat-collecting tube, a solar trough-type heat-collecting plate, and an automatic sunlight tracker; Control the sunlight catcher and motor of the solar automatic tracker to drive the solar trough heat collecting plate to follow the sunlight to rotate, and the solar vacuum heat collecting tube is fixed on the center line of the focusing focus of the solar trough heat collecting plate; the solar vacuum heat collecting tube The outer layer is a vacuum insulation layer;

The electric heating area includes an air heater and an air overflow pipe; the air heater is connected to the solar trough heat collecting area through a communication insulation pipe, and a temperature sensor is arranged in the communication insulation pipe;

The system control area includes a main switch for system operation on the power bus and a sub-switch on the power supply bus of each functional area, a system operation control center, a system operation status display screen, and an air flow control panel on the system operation control panel. Controller, solar heating temperature regulator, solar automatic tracker controller, valve opening and closing control system, electric heating temperature and flow controller; through the sensor set in the system, the system operation data is transmitted to the system operation control center, The current system operation status is displayed on the system operation status display screen through the electrical signal transformation, and the system operation control is performed.

Effect of the present invention:

1. The solar trough heat collecting panels of the system are placed in the north-south direction, driven by the automatic sunlight tracker, they can track sunlight all day long, and have high light energy utilization rate and light-to-heat conversion efficiency, making the light energy utilization rate reached the maximum.

2. The system controls the opening of valves in different positions through the system control area, and can change different heating modes. The heating temperature is variable, the flow of hot air is controllable, and the scale of the medium and high temperature heat field is controllable. The system has automation and multiple modes. , Comprehensive features.

3. The system can provide a stable medium and high temperature air temperature field through the mutual coupling of the solar trough heat collecting plate and the air heater in the operating state, which can be used for the mesoscopic separation of brine and the mesoscopic drying of excess sludge and other applications.

4. According to different climate conditions, the system can realize the series-parallel structure of solar collector tubes and the series-parallel structure of solar collector area and electric heating area by controlling the opening of butterfly valves in different positions, so as to realize different heating modes and maintain medium and high temperature The air temperature in the thermal field is constant.

5. The system can provide hot air in the range of 100°C-400°C under the action of the solar heat collecting area and the air electric heating area, and the flow rate is 50m ³ /h-600m ³ /h.

Description of drawings

Fig. 1 is a schematic structural diagram of a medium-high temperature all-weather solar trough heat collection and electric heating coupling system of the present invention;

Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8 are diagrams of different heating modes of different connection modes of the structure of the solar trough heat collecting area of the present invention.

In the picture:

1. No. 1 fan 2. No. 2 fan 3. Solar vacuum heat collector 4. Solar trough heat collector 5. Air heater 6. Cold air inlet pipe 7. Hot air discharge pipe 8. Air overflow pipe 9. High temperature heat field 10, air purifier 11, solar automatic tracker 12, heat preservation tube

Detailed ways

The medium-high temperature all-weather solar trough heat collection and electric heating coupling system of the present invention will be described in detail below in conjunction with the accompanying drawings.

The medium and high temperature all-weather solar trough heat collection and electric heating coupling system of the present invention, the system includes a solar trough heat collection area, an electric heating area, a high temperature reaction area, a system control area, a system control area and a trough heat collection area, an electric The heating zone and the high temperature reaction zone are electrically connected.

The structure of the solar trough heat collecting area includes a solar vacuum heat collecting tube 3, and the solar vacuum heat collecting tube 3 is fixed on the central axis of the groove of the solar trough heat collecting plate 4, and the back of the solar trough heat collecting plate 4 The fixed shaft is provided with a solar automatic tracker 11, which drives the solar trough heat collecting plate 4 to follow the sunlight to rotate, one end of the solar vacuum heat collecting tube 3 is provided with a cold air inlet pipe 6, and the other end of the solar vacuum heat collecting tube 3 is provided with a heat sink. Air outlet tube 7.

The electric heating area includes an air heater 5 and an air overflow pipe 8; the air heater 5 is connected with the solar trough heat collecting area through a heat preservation pipe 12, and a temperature sensor is arranged in the heat preservation pipe 12.

The high-temperature reaction zone includes a medium-high temperature heat field 9 and is connected to the electric heating zone through a hot air discharge pipe 7 .

The solar trough heat collecting area, the electric heating area, and the high temperature reaction area are all connected by pipelines, and butterfly valves are arranged on the pipelines.

The system control area includes a system operation control panel, which is provided with a system operation control center electrically connected to each other, a system operation status display screen, an air flow controller, a solar heating temperature regulator, and an automatic sunlight tracking Instrument controller, valve opening and closing control system, electric heating temperature and flow controller; through the temperature sensor and pressure sensor set in the system, the system operation data is transmitted to the system operation control center, and the system operation status is displayed after the electrical signal transformation The current system operation status is displayed on the screen, and the system operation control is carried out.

The solar trough heat collecting area structure formed by connecting the solar vacuum heat collecting tube 3 with the solar trough heat collecting plate 4 can be arranged in parallel or in series, and can also be fixed on the solar trough heat collecting plate 4 with the solar vacuum heat collecting tube 3 On the central axis of the groove, and form a group of independent settings.

The medium-high temperature all-weather solar trough heat collection and electric heating coupling system structure of the present invention is realized in this way:

The system includes a solar trough heat collecting area, an electric heating area, a high temperature reaction area, and a system control area; the solar vacuum heat collecting tube 3 in the solar trough heat collecting area is fixed on the central axis of the groove of the solar trough heat collecting plate 4 On the fixed shaft at the back of the solar trough heat collecting plate 4, a solar automatic tracker 11 is arranged. The cold air enters the tube 6 through the No. 2 fan 2, and the air cleaner 10 enters the solar heat collection vacuum tube 3, and the air heated by the solar energy is transported to the high temperature reaction zone by the heat preservation tube. The intake end of the high temperature reaction zone insulation pipe 12 is provided with a temperature sensor, if the air temperature at the intake end does not reach the required temperature of the high temperature reaction zone, then the air heated by the solar energy will continue to heat up to the required temperature by the air heater 5 in the electric heating zone. Need temperature. In this way, a medium-high temperature all-weather solar trough heat collection and electric heating coupling system is formed. The system control area controls the working state of the system through the adjustment device of the system control panel. The high-temperature reaction area can provide a high-temperature reaction heat field 9, which can be used for Applications such as mesoscopic separation of brine and drying of excess sludge.

The solar trough heat collecting area includes a solar vacuum heat collecting tube 3, a solar trough heat collecting plate 4, and an automatic sunlight tracker 11; The tracker 11, by controlling the sunlight catcher and the motor of the automatic sunlight tracker 11, drives the solar trough heat collecting plate 4 to follow the sunlight to rotate, and the solar vacuum heat collecting tube 3 is fixed on the focusing focus of the solar trough heat collecting plate 4 on the center line; the outer layer of the solar vacuum heat collecting tube 3 is a vacuum insulation layer.

The electric heating area includes an air heater 5 and an air overflow pipe 8; the air heater 5 is connected to the solar trough heat collecting area through a communication insulation pipe 12, and a temperature sensor is arranged in the communication insulation pipe 12.

The high-temperature reaction zone includes a medium-high temperature heat field 9 formed by a common hot air storage tank, an air intake valve, a pressure reducing valve, and an air flow meter. The medium-high temperature heat field 9 passes through the hot air discharge pipe 7 and Electric heating zone is connected. The hot air storage tank in the high-temperature reaction zone is provided with a pressure sensor and a temperature sensor, and an insulation layer is provided on the outer layer. Air intake valves, pressure reducing valves and air flow meters are installed at the front and rear of the hot air storage tank, and the hot air enters the high temperature reaction zone through the pressure reducing valve to form a medium and high temperature thermal field 9 .

The system control area includes a main switch for system operation on the power bus and a sub-switch on the power supply bus of each functional area, a system operation control center, a system operation status display screen, and an air flow control panel on the system operation control panel. Controller, solar heating temperature regulator, solar automatic tracker controller, valve opening and closing control system, electric heating temperature and flow controller; through the sensor set in the system, the system operation data is transmitted to the system operation control center, The current system operating status is displayed on the system operating status display screen through the electrical signal transition. The system operation control is carried out by adjusting each controller.

The system described above can provide a stable medium-high temperature air heat field through the mutual coupling of the solar trough heat collecting plate and the air heater in the running state. The said system can realize constant air temperature by controlling the opening of butterfly valves at different positions according to different climatic conditions. The system can realize the series-parallel structure of the solar heat collection area by controlling the opening of the butterfly valves at different positions. The system can realize controllable flow of hot air by controlling the opening of butterfly valves at different positions. The said system can provide hot air in the range of 100°C-400°C under the action of the solar heat collecting area and the electric air heating area, and the flow rate is 50m ³ /h-600m ³ /h.

It works as follows:

As shown in Figure 1, turn on the automatic sunlight tracking 11, make the solar trough heat collecting plate 4 rotate under the drive of the sunlight automatic tracker 11, until the solar trough heat collecting plate 4 is perpendicular to the sunlight; then turn on the No. 1 fan 1. After purification, the cold air is drawn into the solar vacuum heat collecting tube 3 through the drive of the fan, and under the action of the solar trough heat collecting plate 4, the air is heated rapidly, such as the temperature of the heated air reaches the temperature required by the high temperature reaction zone , then directly pass through the air flow pipe 8 for high-temperature reaction, if the air temperature after heating is lower than the temperature required in the high-temperature reaction zone, then the air heater 5 is required to make up the temperature difference, so as to form a constant medium-high temperature in the high-temperature reaction zone hot field9. According to different climate conditions, through the opening and closing control of butterfly valve a, butterfly valve b, butterfly valve c, butterfly valve d, butterfly valve e, butterfly valve f, butterfly valve g, butterfly valve h, butterfly valve n, butterfly valve m, butterfly valve x, butterfly valve y, the system is always A constant temperature field can be provided, and the flow of hot air in the scale of the temperature field is controllable, and the scale of the temperature field is controllable.

Different heating modes that can be realized by this system:

Mode 1; as shown in Figure 1, open butterfly valve a, butterfly valve b, butterfly valve c, butterfly valve f, butterfly valve m, butterfly valve n, butterfly valve x, close butterfly valve d, butterfly valve e, butterfly valve h, butterfly valve g, butterfly valve y, and realize the In the heating mode shown in Figure 2, the butterfly valve is omitted in Figure 2, which does not affect the heating principle. This mode is parallel connection of solar vacuum heat collecting tubes, and parallel connection of solar heat collecting area and electric heating area. This mode is a large flow air constant temperature control mode. The air flow rate reaches 400-600m ³ /h, and the temperature field can be kept constant at a temperature between 100°C and 300°C. It is suitable for situations where there is insufficient sunlight, a medium-high temperature thermal field is provided, and the scale of the medium-high temperature thermal field is large.

Mode 2: As shown in Figure 1, open butterfly valve a, butterfly valve b, butterfly valve c, butterfly valve f, butterfly valve m, and butterfly valve y, and close butterfly valve d, butterfly valve e, butterfly valve h, butterfly valve g, butterfly valve n, and butterfly valve x. For the heating mode shown in Figure 3, the butterfly valve is omitted in Figure 3, which does not affect the heating principle. This mode is that the solar vacuum heat collecting tubes are connected in parallel, and the solar heat collecting area is connected in series with the electric heating area. This mode is the medium flow air constant temperature control mode. The air flow rate is between 200-400m ³ /h, and the temperature of the temperature field can be kept constant at a certain temperature between 100°C and 300°C. It is suitable for situations where there is insufficient sunlight and a medium-high temperature thermal field is provided, and the scale of the medium-high temperature thermal field is generally large.

Mode 3: As shown in Figure 1, open butterfly valve a, butterfly valve b, butterfly valve c, butterfly valve f, butterfly valve m, and butterfly valve n, and close butterfly valve d, butterfly valve e, butterfly valve h, butterfly valve g, butterfly valve y, and butterfly valve x. For the heating mode shown in Figure 4, the butterfly valve is omitted in Figure 4, which does not affect the heating principle. This mode is parallel connection of solar vacuum heat collector tubes, without electric heating for heating. This mode is the medium flow air constant temperature control mode. The air flow rate is between 200-400m ³ /h, and the temperature of the temperature field can be kept constant at a certain temperature between 100°C and 300°C. It is suitable for strong sunlight and high temperature weather in summer, and the medium and high temperature heat field is generally large in scale.

Mode 4: As shown in Figure 1, open butterfly valve a, butterfly valve b, butterfly valve d, butterfly valve g, butterfly valve m, and butterfly valve y, and close butterfly valve c, butterfly valve e, butterfly valve f, butterfly valve h, butterfly valve n, and butterfly valve x. The heating mode shown in 5; or open butterfly valve a, butterfly valve c, butterfly valve e, butterfly valve h, butterfly valve m, butterfly valve y, close butterfly valve b, butterfly valve d, butterfly valve g, butterfly valve f, butterfly valve n, butterfly valve x, can also be realized In the heating mode shown in Figure 5, the butterfly valve is omitted in Figure 5, which does not affect the heating principle. This mode is that the solar vacuum heat collecting tubes are connected in series, and the solar heat collecting area is connected in series with the electric heating area. This mode is low flow air thermostatic control mode. The air flow rate is between 50-200m ³ /h, and the temperature of the temperature field can be kept constant at a certain temperature between 200°C and 400°C. This mode can provide a strong high-temperature thermal field in summer when the sun is sufficient, and the sun is weak, and secondary sunlight heating is required to supplement the heat. It is suitable for the case of a small temperature field.

Mode 5: As shown in Figure 1, open butterfly valve a, butterfly valve b, butterfly valve d, butterfly valve g, butterfly valve m, and butterfly valve n, and close butterfly valve c, butterfly valve e, butterfly valve h, butterfly valve f, butterfly valve x, and butterfly valve y. The heating mode shown in 6; or open butterfly valve a, butterfly valve c, butterfly valve e, butterfly valve h, butterfly valve m, butterfly valve n, close butterfly valve b, butterfly valve d, butterfly valve g, butterfly valve f, butterfly valve x, butterfly valve y, can also be realized In the heating mode shown in Figure 6, the butterfly valve is omitted in Figure 6, which does not affect the heating principle. This mode is a series connection of solar vacuum heat collecting tubes without electric heating. This mode is low flow air thermostatic control mode. The air flow rate is between 50-200m ³ /h, and the temperature of the temperature field can be kept constant at a certain temperature between 200°C and 300°C. This mode can provide high-temperature heat field in summer when the sun is sufficient and the sun is weak, and secondary sunlight heating is needed to supplement the heat. It is suitable for the case of a small temperature field.

Mode 6: As shown in Figure 1, open butterfly valve a, butterfly valve b, butterfly valve d, butterfly valve g, butterfly valve m, butterfly valve n, butterfly valve x, close butterfly valve c, butterfly valve e, butterfly valve h, butterfly valve f, butterfly valve y, and realize the The heating mode shown in 7 or open butterfly valve a, butterfly valve c, butterfly valve e, butterfly valve h, butterfly valve m, butterfly valve n, butterfly valve x, close butterfly valve b, butterfly valve d, butterfly valve g, butterfly valve f, butterfly valve y, can also be realized In the heating mode shown in Figure 7, the butterfly valve is omitted in Figure 7, which does not affect the heating principle. This mode is that the solar vacuum heat collecting tubes are connected in series, and the solar heat collecting area is connected in parallel with the electric heating area. This mode is the medium flow air constant temperature control mode. The air flow rate is between 200-400m ³ /h, and the temperature of the temperature field can be kept constant at a certain temperature between 200°C and 400°C. This mode can provide high-temperature heat field in summer when the sun is sufficient and the sun is weak, and secondary sunlight heating is required to supplement the heat. It is suitable for situations where the temperature field is generally large in scale.

Mode 7: As shown in Figure 1, open butterfly valve x, close butterfly valve a, butterfly valve b, butterfly valve c, butterfly valve d, butterfly valve e, butterfly valve f, butterfly valve g, butterfly valve h, butterfly valve m, butterfly valve n, butterfly valve y, and realize the In the heating mode shown in Figure 8, the butterfly valve is omitted in Figure 8, which does not affect the heating principle. This mode is fully electric heating air. This mode is low flow air thermostatic control mode. The air flow rate is between 50-200m ³ /h, and the temperature of the temperature field can be kept constant at a certain temperature between 100°C and 300°C. This mode can provide a high-temperature thermal field in cloudy and rainy days without sunshine, and is suitable for situations where the temperature field is small.

Claims (5)

1. An all-weather solar trough heat collecting and electric heating coupling system is characterized in that: the system includes a solar trough heat collecting area, an electric heating area, a high temperature reaction area, and a system control area; the system control area and the trough heat collecting zone, electric heating zone, and high temperature reaction zone are electrically connected; The structure of the solar trough heat collecting area includes a solar vacuum heat collecting tube (3), and the solar vacuum heat collecting tube (3) is fixed on the central axis of the groove of the solar trough heat collecting plate (4). The fixed shaft on the back of the heat collecting plate (4) is equipped with a solar automatic tracker (11), which drives the solar trough heat collecting plate (4) to follow the sunlight to rotate, and one end of the solar vacuum heat collecting tube (3) is provided with cold air to enter Tube (6), the other end of the solar vacuum collector tube (3) is provided with a hot air discharge tube (7); The electric heating area includes an air heater (5) and an air overflow pipe (8); the air heater (5) is connected to the solar trough heat collecting area through a communication insulation pipe (12), and the connection insulation pipe ( 12) There are temperature sensors and pressure sensors inside; The high-temperature reaction zone includes a medium-high temperature thermal field (9) composed of a hot air storage tank, an air intake valve, a pressure reducing valve, and an air flow meter. There are pressure sensors and temperature sensors inside the tank, an insulation layer on the outer layer, inlet valves, pressure reducing valves and air flow meters on the front and back of the hot air storage tank, and the hot air enters the high temperature reaction zone through the pressure reducing valve. high temperature heat field; The solar trough heat collecting area, the electric heating area, and the high temperature reaction area are all connected by pipelines, and butterfly valves are installed on the pipelines; The system control area includes a system operation control panel, which is provided with a system operation control center electrically connected to each other, a system operation status display screen, an air flow controller, a solar heating temperature regulator, and an automatic sunlight tracking Instrument controller, butterfly valve opening and closing control system, electric heating temperature and flow controller; through the temperature sensor and pressure sensor set in the system, the system operation data is transmitted to the system operation control center, and the system operation status is displayed after the electrical signal transformation The current system operation status is displayed on the screen, and the system operation control is carried out. 2. The all-weather solar trough heat collection and electric heating coupling system according to claim 1, characterized in that: the solar trough heat collection tube (3) is connected with the solar trough heat collector (4) to form a solar trough The heat collecting area structure can be arranged in parallel or in series, and can also be arranged separately with the solar trough heat collecting area structure formed by connecting the solar vacuum heat collecting tube (3) and the solar trough heat collecting plate (4). 3. The all-weather solar trough heat collection and electric heating coupling system according to claim 1 or 2, characterized in that: the outer layer of the solar vacuum heat collection tube (3) is provided with a vacuum insulation layer. 4. The all-weather solar trough heat collection and electric heating coupling system according to claim 1, characterized in that: the butterfly valve opening and closing control system realizes the series and parallel connection of solar vacuum heat collection tubes by controlling the opening and closing of butterfly valves at different pipeline positions The structure and the series-parallel structure of the solar trough heat collecting area and the electric heating area. 5. The all-weather solar trough heat collection and electric heating coupling system according to claim 1, characterized in that: the all-weather solar trough heat collection and electric heating coupling system is located between the solar trough heat collection area and the electric heating area Under action, it can provide hot air in the range of 100°C-400°C, with a flow rate of 50m ³ /h-600m ³ /h.

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