CN110173890A - The electrode heating apparatus of glass steel box - Google Patents

Abstract

The invention relates to an electrode heating device for a glass fiber reinforced plastic box body. A box cover is sealed with the heating box body; a heat exchange tube; the heat exchange tube is placed in the heating box, and is fixedly connected with the diverter and the water collector to play the role of secondary heat exchange, transferring the heat of the steam to the circulating water in the pipeline; the There is an electrode at the bottom of the heating box, and the electrode is connected to the box cover through a conductive screw rod; the side of the heating box is equipped with a normal water level electrode, a low water level alarm electrode and a high water level alarm electrode; The heater is connected with the external pipeline to form a closed circulation system; the electrodes are connected to 220V/380V alternating current through a conductive screw rod, which converts the water in the electrolyte solution in the heating box into steam, and then converts the water in the electrolytic solution in the heating box into steam by means of phase change heat. The heat of the steam is transferred to the circulating water in the heat exchanger to achieve the purpose of secondary heat exchange for heating.

Description

Electrode heating device for glass fiber reinforced plastic box

technical field

The invention relates to an electrode heating device, in particular to an electrode heating device made of high temperature resistant glass fiber reinforced plastic.

Background technique

Every autumn and winter heating season, coal is burned in large quantities, and air pollution becomes extremely serious. Coal combustion not only consumes a lot of non-renewable resources, but also causes serious pollution to the environment. The state attaches great importance to the prevention and control of air pollution. According to the policy directive of the "Plan for Clean Heating in Winter in Northern Regions (2017-2021)" jointly issued by ten ministries and commissions, the "coal-to-clean energy" projects in all parts of the north will be completed by the end of 2021. Clean energy is the main trend for future heating.

At present, "coal-to-gas" has three major drawbacks: insufficient supply, high price and poor safety. In contrast, "coal-to-electricity" is much more reliable. From the perspective of environmental protection, most of the electricity in my country comes from thermal power. Although coal is also consumed, thermal power plants are much less polluting than civilian coal. Because civil coal has not taken environmental protection measures such as dust removal and desulfurization, the pollution is even greater. The amount of pollutants emitted by the combustion of 1 ton of loose coal is 5 to 10 times that of coal fired by thermal power. Therefore, the promotion of electric heating can effectively reduce environmental pollution.

Electrode heating equipment has the characteristics of simple structure, high efficiency, long life and no pollution, and is a safe and reliable heating and heating device. Electrode heating is a technology in which an electrolyte solution with a certain conductivity is used as a resistor to generate heat when an alternating current passes through the electrolyte solution to heat the water in the electrolyte solution to generate steam. At present, the use of large-scale electrode boilers for central heating faces the problems of high voltage and high construction cost of heating pipeline systems. In contrast, using low voltage (AC 220V/380V) to directly arrange small low-voltage electrode heating devices in local areas for heating nearby, not only can the advantages of electrode heating technology be better played, but also the application of this advanced heating method can be better. Expansion of the range over a large area. At present, in the field of low-voltage (AC 220V/380V) civil electricity, heating devices, systems and products using electrode heating have not yet appeared. Therefore, research and development of electrode heating and heating devices suitable for local areas has important economic and social value. However, the electrode heating device imposes strict requirements on the materials used for the heating box and the box cover, and the high temperature resistant FRP material has good insulation, does not absorb water, is resistant to electrolyte solution corrosion, has high strength, is convenient for electrode layout and has good overall sealing. Advantages, it is very suitable for the production of heating box and box cover.

In view of this, an electrode heating device for a FRP box is invented, which is composed of a FRP heating box and a FRP integrated box cover. The FRP heating box is a container for the process of electrically heating the water in the electrolyte solution into steam, and circulating water to take away the heat of the steam into condensed water. The FRP box body and the FRP integrated box cover are sealed and combined to form an effective insulating structure and ensure the normal operation of the electrode heating device.

SUMMARY OF THE INVENTION

The present invention is to provide an electrode heating device for a glass fiber reinforced plastic box, the purpose of which is to rely on electrode heating technology: insert electrodes into an electrolyte solution, and use an electrolyte solution with a certain conductivity as a resistance. The high-resistance characteristics of the battery generate heat, the electrolyte solution is heated to generate steam, and a small low-voltage (AC 220V/380V) electrode heating device is arranged in a local area for heating nearby.

For achieving the above object, technical scheme of the present invention is as follows:

An electrode heating device for a glass fiber reinforced plastic box body, comprising a heating box body, a shunt and a water collector, a heat exchange tube, and a box cover, the box cover is sealed with the heating box body; the box cover is integrated with a shunt and a box cover. Water collector, negative pressure valve, exhaust valve, pressure gauge, water injection port and heat exchange pipe; the heat exchange pipe is placed in the heating box and is fixedly connected with the diverter and the water collector for secondary heat exchange The function of the heating box is to transfer the heat of the steam to the circulating water in the pipeline; the bottom of the heating box is provided with an electrode, and the electrode is connected to the box cover through a conductive screw rod; the side of the heating box is equipped with a normal water level electrode and a low water level alarm The electrode and the high water level alarm electrode; the heat exchange tube is connected with the external pipeline through the shunt and the water collector to form a closed circulation system; the electrode is connected to the 220V/380V alternating current The water in the electrolyte solution becomes steam, and then the heat of the steam is transferred to the circulating water in the heat exchanger by means of phase change heat, so as to achieve the purpose of secondary heat exchange for heating.

Further, the box cover is tightly and sealedly connected to the heating box body through a silicone gasket and stainless steel screws, gaskets and nuts.

Further, the conductive screw rod and the box cover are threadedly connected and fastened with a sealing gasket and a sealing nut, and the conductive screw rod and the electrode on the bottom of the heating box are fixed by welding or screw connection.

Further, the bottom center of the heating box is provided with a sewage outlet, and the sewage outlet is provided with a sewage discharge valve made of polytetrafluoroethylene, and the sewage valve is connected with the heating box by threads.

Further, the heat exchange tube is fixed on the tank cover by means of pre-embedding.

Further, the negative pressure valve, the exhaust valve and the pressure gauge are connected to the tank cover through a screw seal, and the functions of the negative pressure valve and the exhaust valve are to maintain the pressure in the tank stable; There is an internal thread in the nozzle, which is usually sealed with a plug to prevent air leakage.

Further, the heating box body and the box cover are made of glass fiber reinforced plastic, and the high temperature resistant glass fiber reinforced plastic material is used to make the box body and box cover of the electrode heating device, so that the electric water heating process is insulated from the outside world and the safety of the electrode heating device is ensured.

Further, an exhaust valve and a negative pressure valve are installed on the box cover to maintain the pressure balance in the box, and the exhaust valve also plays the role of removing non-condensable gas so that the heating box can Maintaining a semi-vacuum state in the body is conducive to enhancing heat transfer; the pressure gauge is used for real-time monitoring of pressure changes in the device.

Further, the normal water level electrode, the low water level alarm electrode and the high water level alarm electrode installed on the heating box are used to monitor whether the water level in the box is normal, and give an alarm when it is high or low.

Further, after the electrolyte solution in the heating box is heated by electricity, a large amount of steam is generated, and the steam rises to contact the heat exchange tube, and the heat exchange tube transfers heat to the circulating water in the pipeline, and condenses into liquid and returns to the electrolyte solution, The circulating water in the pipeline is heated and heated up and then flows out of the heating box, and reaches the radiator through the pipeline to transfer the heat to the air. The temperature of the circulating water is lowered, so that 100% of the electric energy is converted into heat, and the secondary heat exchange heating method is adopted to ensure that the steam and the Separation of circulating water to avoid loss of electrolyte solution.

The electrode heating device of the glass fiber reinforced plastic box of the present invention has the following beneficial effects:

1) Low working voltage: the power supply voltage is 220V/380V for civil use;

2) Fast heating speed: the boiling temperature of the water electrolyte solution in the vacuum state is reduced, the boiling time is reduced, and the rapid heating of the electrode heating device can be realized;

3) The condensing phase conversion heat method is adopted, so that the heat transfer efficiency is greatly improved, and the energy saving effect is remarkable;

4) The heating method of secondary heat exchange is adopted, so that the generated steam can directly exchange heat with the circulating water through the phase change heat, thus avoiding the loss of the electrolyte solution;

5) High safety: when the pressure in the heating box is less than 10kPa during normal operation, the electrolyte solution drying device in the heating box will automatically power off. Equipped with overvoltage, overheating, overcurrent protection and water level monitoring to ensure safe operation;

6) Easy installation and maintenance: The integrated box cover and the heating box are designed separately. The exhaust valve, pressure gauge, negative pressure valve, heat exchange tube and electrode are all installed on the box cover.

Description of drawings

Fig. 1 is the structural representation of the electrode heating device of the glass fiber reinforced plastic material box of the present invention;

Fig. 2 is the schematic diagram of the glass fiber reinforced plastics box body involved in the present invention;

3 is a schematic diagram of a box cover of the electrode heating device involved in the present invention;

In the figure: 1—negative pressure valve; 2—water injection port; 3—exhaust valve; 4—pressure gauge; 5—diverter and water collector; 6—box cover; 7—silicone pad; 8—heating box; 9—heat exchange tube; 10—sealing gasket; 11—stainless steel screw; 12—stainless steel gasket; 13—stainless steel nut; 14—conductive screw rod; 15—electrode; 16—sewage outlet; 17—sealing nut; 18— Normal water level electrode; 19—low water level alarm electrode; 20—high water level alarm electrode.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIGS. 1 to 3 , the electrode heating device of the FRP box of the present invention includes a heating box 8 , a shunt and a water collector 5 , a heat exchange tube 9 , a box cover 6 , a conductive screw 14 , and an electrode 15 , Normal water level electrode 18, low water level alarm electrode 19, high water level alarm electrode 20, etc. The sewage outlet 16 in the center of the bottom of the heating box 8 is equipped with a sewage valve made of polytetrafluoroethylene, and the sewage valve is connected with the heating box through a thread. The box cover 6 and the heating box body 8 adopt a separate design, and are fastened and sealed by the silicone gasket 7 and the stainless steel screw 11 , the gasket 12 and the nut 13 . A negative pressure valve 1 , an exhaust valve 3 , a pressure gauge 4 , a water injection port 2 and a heat exchange tube 9 are integrated on the tank cover 6 . The heat exchange tube 9 is fixed on the tank cover 6 by pre-embedding. The functions of the negative pressure valve 1 and the exhaust valve 3 are to keep the pressure in the heating box 8 stable. Another function of the exhaust valve 3 is to discharge the non-condensable gas in the heating box 8 , maintain the weak vacuum state in the heating box 8 , and strengthen the heat exchange between the steam and the circulating water in the heat exchange tube 9 . The pressure gauge 4 shows the pressure in the heating box 8 . The negative pressure valve 1 , the exhaust valve 3 and the pressure gauge 4 are connected with the tank cover 6 through screw sealing. The water injection port 2 plays the role of replenishing water, and the car has internal threads, which are usually sealed with a plug to prevent air leakage. The heat exchange tube 9 is placed in the heating box 8, and the heat exchange tube 9 is connected with the shunt and the water collector 5 by electric welding, which plays the role of secondary heat exchange, and transfers the heat of the steam to the circulating water in the pipeline. The functions of the diverter and the water collector 5 are the diversion and confluence of the circulating water in the external pipeline. The conductive screw 14 is connected with the box cover 6 by screws, and is fastened by a sealing gasket 10 and a sealing nut 17. The conductive screw 14 is fixed with the electrode 15 on the bottom of the heating box 8 by welding or screwing. The normal water level electrode 18 , the low water level alarm electrode 19 and the high water level alarm electrode 20 are installed on the box body 8 by screw connection.

As shown in FIG. 2 , the heating box 8 of the electrode heating device according to the present invention is integrally made of high-temperature resistant glass fiber reinforced plastic, and has the shape of a hollow cube.

The heating box 8 and the box cover 6 are made of FRP. FRP has the following advantages: (1) Light weight and high strength: the relative density is between 1.5-2.0, only 1/4-1/5 of carbon steel, but the tensile strength is close to, or even exceeds, carbon steel, while the specific strength can be Compared with high-grade alloy steel; (2) Corrosion resistance: It has better resistance to the atmosphere, water and general concentrations of acids, alkalis, salts, and various oils and solvents; (3) Good electrical properties: excellent Insulating material, used to make insulators; (4) Good thermal performance: low thermal conductivity, 1.25-1.67kJ/(m·h·K) at room temperature, only 1/100-1/1000 of metal, which is excellent Thermal insulation material. By selecting high temperature resistant resin, the long-term working temperature of the material can reach 200-300 °C; (5) Good designability: various structural products can be flexibly designed according to needs to meet the requirements of use, and materials can be fully selected to meet the performance of the product , such as: corrosion resistance, instantaneous high temperature resistance, special high strength in a certain direction of the product, good dielectric properties, etc.; Quantity to flexibly choose the molding process.

The electrode heating device is connected with the shunt, the water collector and the external pipeline through the heat exchange tube installed on the tank cover to form a closed circulation system. The electrolyte solution in the heating box generates a large amount of steam after being heated by electricity. The steam rises to contact the heat exchange tube, transfers heat to the circulating water in the pipeline, and condenses into a liquid back into the electrolyte solution. The circulating water in the pipeline is heated and heated up and then flows out of the heating box, and reaches the radiator through the pipeline to transfer the heat to the air, and the temperature of the circulating water decreases. The whole heat transfer process reciprocates and does not cause any energy loss, so 100% of the electric energy is converted into heat, and the utilization rate of electric energy is high. This secondary heat exchange heating method ensures the separation of steam and circulating water and avoids the loss of electrolyte solution.

The electrode heating device involved in the present invention heats a room of 50 square meters. Assuming that the power requirement per square meter is 80W, the required power for heating the entire room is P=80W/m ² ·50m ² =4kW. According to 220V voltage (single-phase) power supply, I=4kW/220V=18.2A. In the closed circulation system formed by the heating device and the radiator pipeline, the radiator inlet temperature is maintained at 70-75°C, the outlet temperature (circulating water temperature) can be maintained at 55-60°C, and the outdoor ambient temperature is 5°C.

Table 1 Water temperature detection record table

The following characteristics can be summarized from the performance investigation and component arrangement of the above-mentioned device. One is that the device is small and flexible, the box cover and the heating box are designed separately, and the installation and disassembly are convenient. Low voltage (AC 220V/380V) is used to directly Electrode heating device power supply, heating effect is good, suitable for home heating. The second is that the electrode heating device adopts the heating method of secondary heat exchange, so that the generated steam can directly exchange heat with the circulating water through the phase change heat, so as to avoid the loss of the electrolyte solution. The third is to maintain a weak vacuum state in the heating box to enhance heat transfer and fast boiling.

Claims (10)

1. a kind of electrode heating apparatus of glass steel box, including heating compartment, current divider and water collector, heat exchanger tube, case lid, Be characterized in that: the case lid and heating compartment are tightly connected；Current divider and water collector, negative pressure valve, row are integrated on the case lid Air valve, pressure gauge, water filling port and heat exchanger tube；The heat exchanger tube is placed in heating compartment, and is fixed with current divider and water collector Connection, plays the role of secondary heat exchange, by the heat transfer of steam to the recirculated water in pipeline；The heating compartment bottom is equipped with Electrode, electrode pass through conductive screw rod connecting box lid；The heating compartment side is equipped with ordinary water level electrode, low-water alarm electrode With high water-level alarm electrode；The heat exchanger tube is connected by current divider, water collector with exterior line, and closed cycle system is formed System；The electrode passes through conductive screw rod and connects 220V/380V alternating current, and the water in the intracorporal electrolyte solution of heater box is become Steam, then by way of phase-change heat-exchange by the heat transfer of steam to the recirculated water in heat exchanger, realize secondary heat exchange heating Purpose.

2. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: the case lid passes through silica gel Pad, CARBURIZING FURNACE FOR STAINLESS FASTENER, gasket and nut and heating compartment are fastened and connected.

3. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: the conduction screw rod and case Lid is connected through a screw thread, and is fastened using gasket seal and sealing nut, the electricity on the conduction screw rod and heating compartment bottom Pole is by welding or is threadedly coupled fixation.

4. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: the heating compartment bottom Center is equipped with sewage draining exit, the blowdown valve of polytetrafluoroethylene (PTFE) material is housed, and blowdown valve and heating compartment pass through screw thread on sewage draining exit Connection.

5. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: the heat exchanger tube passes through pre- The mode buried is fixed on case lid.

6. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: the negative pressure valve, exhaust Valve and pressure gauge are connect with case lid by thread seal, and the effect of the negative pressure valve and exhaust valve is to maintain the intracorporal pressure of case steady It is fixed；The water filling port is used for moisturizing, is equipped with internal screw thread in water filling port, usually sealing using plug prevents gas leakage.

7. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: the heating compartment and case Lid is made of glass reinforced plastic, using the cabinet and case lid of pyroceram Steel material production electrode heating apparatus, so that electric-heating water Process and external insulation guarantee the safety of electrode heating apparatus.

8. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: be equipped on the case lid Exhaust valve and negative pressure valve, for maintaining the intracorporal pressure balance of case, the exhaust valve also acts as the effect for excluding incoagulable gas So that maintaining semi-vacuum state in heating compartment in entire diabatic process, being conducive to augmentation of heat transfer；The pressure gauge is for real-time Pressure change in monitoring device.

9. the electrode heating apparatus of glass steel box according to claim 1, it is characterised in that: pacify on the heating compartment Ordinary water level electrode, low-water alarm electrode and the high water-level alarm electrode of dress, it is whether normal for the intracorporal water level of monitoring case, Alarm is given when occurring higher or relatively low.

10. the electrode heating apparatus of -9 any glass steel box according to claim 1, it is characterised in that: the heating It is produced after the intracorporal electrolyte solution electrified regulation of case into a large amount of steam, steam rising touches heat exchanger tube, by heat exchanger tube by heat Recirculated water in pipeline is passed to, and is condensed into liquid and returns in electrolyte solution, outflow adds after circulating water heating heating in pipeline Hot tank body reaches radiator by the road and transfers heat to air, and circulating water temperature reduces, so that electric energy 100% is converted to heat, adopt With the mode of this secondary heat exchange heating, it is ensured that the separation of steam and recirculated water avoids the loss of electrolyte solution.