Gas and electricity combined heating device

Abstract

The utility model discloses a gas and electricity combined heating device which comprises a heating pipe, a heat exchanger and a resistance heater. The heat exchanger comprises an insulating shell, a combustible gas heat exchange channel and an air heat exchange channel are arranged in the insulating shell, an ejector is further arranged on the insulating shell, the combustible gas heat exchange channel and the air heat exchange channel are connected with the ejector, and a low-speed airflow inlet of the ejector is communicated with an inner cavity of the insulating shell. The resistance heater comprises an electrode connected to the insulating shell through an insulating sleeve and a heating plate connected with the electrode. According to the gas and electricity combined heating device, combustible gas heating can be independently adopted, electricity heating can be independently adopted, and combustible gas and electricity combined heating can also be adopted, so that an enterprise can reasonably select a heating mode according to the actual conditions such as the current electricity price, the natural gas price and the heating temperature requirement; the energy consumption cost of an enterprise is reduced, and peak load shifting of a power grid is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of heaters, in particular to a heater with both gas heating and electric heating. Background Art

[0002] Industrial kilns are common heating equipment in industrial production. They use the heat from fuel combustion or electric energy conversion to heat materials or workpieces. In the prior art, industrial kilns with special atmosphere requirements in the furnace are either heated by electricity or indirectly heated by burning combustible gas. There is no form that uses both electricity and combustible gas for heating.

[0003] Time-of-use electricity price means that 24 hours a day is divided into several time periods according to the system operation status, and the electricity fee for each time period is charged according to the average marginal cost of system operation. Under the implementation of time-of-use electricity price, during the low electricity consumption period, the cost of using electric heating for industrial kilns and other equipment is lower than the cost of using combustible gas heating; during the peak electricity consumption period, the cost of using electric heating for industrial kilns and other equipment is higher than the cost of using combustible gas heating.

[0004] However, the heaters used in existing industrial kilns and other equipment only have one mode of electric heating or combustible gas heating. It is not possible to reasonably choose electric heating or combustible gas heating according to the situation, which is not conducive to reducing the energy consumption cost of the enterprise. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a combined gas and electricity heating device to solve the technical problem that the heaters used in existing industrial kilns and other equipment only have electric heating or combustible gas heating, and cannot reasonably choose electric heating or burning combustible gas heating according to the situation, which is not conducive to reducing the energy consumption cost of the enterprise.

[0006] The utility model gas and electricity combined heating device comprises a heating tube, a heat exchanger and a resistance heater;

[0007] The heat exchanger comprises an insulating shell, the air inlet and the exhaust end of the heating tube are connected to the insulating shell, the insulating shell is also provided with a smoke inlet and a smoke outlet, and the smoke inlet is connected to the exhaust end of the heating tube;

[0008] A combustible gas heat exchange channel and an air heat exchange channel are arranged in the insulating shell, and the combustible gas heat exchange channel and the air heat exchange channel are isolated from each other. The insulating shell is also provided with a combustible gas interface connected with the air inlet of the combustible gas heat exchange channel and an air interface connected with the air inlet of the air heat exchange channel; the insulating shell is also provided with an ejector for ejecting gas into the heating tube, and the outlet of the combustible gas heat exchange channel and the outlet of the air heat exchange channel are respectively connected with the high-speed air flow inlet of the ejector, and the low-speed air flow inlet of the ejector is connected with the inner cavity of the insulating shell, and the ejection outlet of the ejector is located at the air inlet end of the heating tube; the insulating shell is also provided with an igniter, and the ignition end of the igniter is located in the air inlet end of the heating tube;

[0009] The resistance heater comprises an electrode connected to an insulating shell through an insulating sleeve and a heating plate connected to the electrode.

[0010] Furthermore, heat exchange fins are arranged on the outer side of the heating tube.

[0011] Furthermore, the heating plate is connected to the heat exchange fins.

[0012] Beneficial effects of the utility model:

[0013] 1. The utility model of the gas and electricity combined heating device can use combustible gas for heating alone, electricity for heating alone, or a combination of combustible gas and electricity for heating, so that enterprises can reasonably choose the heating method according to the actual needs such as the current electricity price, natural gas price, heating temperature requirements, etc., which is beneficial to reducing the energy consumption cost of the enterprise and also beneficial to the peak load shaving and valley filling of the power grid.

[0014] 2. The utility model gas and electric combined heating device is used in industrial furnaces such as carburizing furnaces and nitriding furnaces where the heating gas cannot affect the atmosphere in the furnace and the workpiece. Since the gas runs in the heating pipe, the heating gas is prevented from entering the industrial furnace, which can reliably ensure that the heating gas will not affect the quality of the workpiece.

[0015] 3. The utility model gas and electricity combined heating device, the combined structure of the heating tube and the heat exchanger, enables the hot gas discharged from the heat exchange tube to preheat the combustible gas and air, which can further reduce fuel consumption.

[0016] 4. The utility model gas and electricity combined heating device, by respectively arranging ejectors at the outlet ends of the combustible gas heat exchange channel and the air heat exchange channel, uses the ejectors to eject part of the low-temperature flue gas into the heating tube, which can reduce the temperature of the high-temperature combustion section in the heating tube, thereby reducing the amount of nitrogen oxides generated during combustion, making the heating device more environmentally friendly.

[0017] 5. The utility model gas and electricity combined heating device combines electric heating and combustible gas heating into one, has a compact structure, is easy to install, and is convenient for upgrading and transformation of existing industrial kilns and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a gas and electric combined heating device;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of a gas and electricity combined heating device. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] As shown in the figure, the gas and electricity combined heating device in this embodiment includes a heating tube 1, a heat exchanger and a resistance heater.

[0022] The heat exchanger comprises an insulating shell 2, the air inlet and the exhaust end of the heating tube are connected to the insulating shell, and the insulating shell is also provided with a smoke inlet 3 and a smoke outlet 4, and the smoke inlet is connected to the exhaust end of the heating tube.

[0023] The insulating shell is provided with a combustible gas heat exchange channel 5 and an air heat exchange channel 6, which are isolated from each other. The combustible gas heat exchange channel and the air heat exchange channel can be in the form of a serpentine tube, a row tube, a heat exchange plate, etc., which can be selected according to needs in the specific implementation. The insulating shell is also provided with a combustible gas interface 7 connected to the air inlet of the combustible gas heat exchange channel and an air interface 8 connected to the air inlet of the air heat exchange channel; the insulating shell is also provided with an ejector 9 for ejecting air into the heating tube, the outlet of the combustible gas heat exchange channel and the outlet of the air heat exchange channel are respectively connected to the high-speed airflow inlet of the ejector, the low-speed airflow inlet of the ejector is connected to the inner cavity of the insulating shell, and the ejection outlet of the ejector is located at the air inlet end of the heating tube; the insulating shell is also provided with an igniter 10, and the ignition end of the igniter is located in the air inlet end of the heating tube.

[0024] The resistance heater comprises an electrode 12 connected to an insulating housing through an insulating sleeve 11 and a heating plate 13 connected to the electrode.

[0025] The gas and electricity combined heating device in this embodiment can use combustible gas alone for heating, electricity alone for heating, or a combination of combustible gas and electricity for heating, so that the enterprise can reasonably choose the heating method according to the actual needs such as the current electricity price, natural gas price, heating temperature requirements, etc., which is beneficial to reducing the energy consumption cost of the enterprise and also beneficial to peak shaving and valley filling of the power grid.

[0026] As an improvement to the above embodiment, the outer surface of the heating tube is provided with heat exchange fins 14, which can accelerate the heat dissipation efficiency and improve the heating speed. In a specific implementation, high temperature resistant insulating coating can be sprayed on the outer surface of the electrode, the heating plate, the heat exchange fins and the heating tube to further improve the safety of the heating device.

[0027] As an improvement to the above embodiment, the heating plate is connected to the heat exchange fins. This improvement enables the heat exchange fins and the heating tubes to also become the heating elements of the electric heater, thereby improving the efficiency of electric heating.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Gas and electricity combined heating device, characterized in that: Includes heating tubes, heat exchangers and resistance heaters; The heat exchanger comprises an insulating shell, the air inlet and the exhaust end of the heating tube are connected to the insulating shell, the insulating shell is also provided with a smoke inlet and a smoke outlet, and the smoke inlet is connected to the exhaust end of the heating tube; A combustible gas heat exchange channel and an air heat exchange channel are arranged in the insulating shell, and the combustible gas heat exchange channel and the air heat exchange channel are isolated from each other. The insulating shell is also provided with a combustible gas interface connected with the air inlet of the combustible gas heat exchange channel and an air interface connected with the air inlet of the air heat exchange channel; the insulating shell is also provided with an ejector for ejecting smoke into the heating tube, and the outlet of the combustible gas heat exchange channel and the outlet of the air heat exchange channel are respectively connected with the high-speed air flow inlet of the ejector, and the low-speed air flow inlet of the ejector is connected with the inner cavity of the insulating shell, and the ejection port of the ejector is located at the air inlet end of the heating tube; the insulating shell is also provided with an igniter, and the ignition end of the igniter is located in the air inlet end of the heating tube; The resistance heater comprises an electrode connected to an insulating shell through an insulating sleeve and a heating plate connected to the electrode.

2. The gas and electricity combined heating device according to claim 1, characterized in that: Heat exchange fins are arranged on the outer side of the heating tube.

3. The gas and electricity combined heating device according to claim 2, characterized in that: The heating plate is connected to the heat exchange fins.

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