Protective gas waste heat recovery device

Abstract

The utility model relates to the technical field of glass manufacturing, in particular to a shielding gas waste heat recovery device which comprises an evaporator (1). The evaporator (1) comprises a shell (2) and a heating pipe (3); a cavity is formed between the shell (2) and the heating pipe (3); an input structure and an output structure are respectively arranged on the shell (2); high-temperature nitrogen is arranged in the heating pipe (3); the device can efficiently utilize waste heat of high-temperature nitrogen in a tin bath to process hot water or steam, the generated hot water can be used for heating a living quarter in winter, the generated steam can be used for heat tracing of a functional pipeline in a factory area, and the two modes are freely switched according to requirements; operation is convenient, and switching is convenient; meanwhile, heat energy is efficiently utilized, and energy waste is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of glass manufacturing, and in particular to a protective gas waste heat recovery device. Background Art

[0002] The tin bath is an indispensable and important part in the float glass industry. During the flattening, thinning and cooling process of the molten glass entering the tin bath from the melting furnace, in order to prevent the molten tin in the tin bath from being oxidized, nitrogen and hydrogen protective gas must be filled in the tin bath to a slightly positive pressure environment for protection. After the protective gas enters the top of the tin bath, it cannot be directly recycled due to contact with oxygen, sulfur dioxide and other impurity gases. The protective gas is burned in an open air at the top of the exhaust pipe at the high-temperature end of the tin bath, dispersing the high-temperature gas discharged from the chimney with continuity and stability; the gas burned in the air at the release point of the tin bath directly enters the workshop and cannot be recycled, resulting in a huge waste of energy.

[0003] After searching, the applicant found that the Chinese patent document with publication number 117735813A disclosed a float glass tin bath waste heat utilization device on March 22, 2024, including an exhaust pipe and a sleeve, wherein the exhaust pipe is used to be connected to the high-temperature exhaust gas pipe of the float glass tin bath, and the sleeve is sleeved on the exhaust pipe and defines a heat exchange cavity therewith, and the sleeve is provided with an air inlet and an air outlet, both of which are connected to the heat exchange cavity, the air inlet is used to transport cooling air into the heat exchange cavity, and the air outlet is used to discharge the gas in the heat exchange cavity for heat exchange with external components.

[0004] This device cannot realize efficient utilization of the heat energy of the high-temperature gas discharged from the tin bath exhaust pipe. Utility Model Content

[0005] The utility model aims to provide a protective gas waste heat recovery device which can realize efficient utilization of the heat energy of high-temperature gas discharged from a tin bath exhaust pipe.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a protective gas waste heat recovery device, including an evaporator; the evaporator includes a shell and a heating tube; a cavity is provided between the shell and the heating tube; an input structure and an output structure are respectively provided on the shell; and high-temperature nitrogen is provided in the heating tube.

[0007] The heating tube comprises an air inlet and an exhaust port; the air inlet is connected to a nitrogen air inlet pipe; the exhaust port is connected to a nitrogen exhaust pipe.

[0008] The input structure comprises a circulating water inlet; the circulating water inlet is connected to the shell and communicated with the cavity; a soft water inlet and a circulating water inlet pipe are respectively arranged on the circulating water inlet; the soft water inlet is connected to the soft water inlet pipe.

[0009] The circulating water inlet pipe is connected to a circulating water inlet valve; the soft water inlet pipe is connected to a soft water inlet valve.

[0010] The output structure comprises an output port; the output port is arranged on the shell and communicated with the cavity; the output port is respectively connected with a hot water output pipe and a steam output pipe.

[0011] The hot water output pipe is connected with a hot water output valve; the steam output pipe is provided with a steam output valve.

[0012] The shell is provided with a pressure gauge, which is communicated with the cavity; the pressure gauge is connected with a pressure controller; the nitrogen inlet pipe is provided with an electric air valve; the pressure controller is connected with the electric air valve; the nitrogen exhaust pipe is connected with an exhaust fan.

[0013] The soft water inlet pipe is connected with a booster pump; a water level monitor is arranged in the cavity; a thermometer is arranged on the shell; and the thermometer is communicated with the cavity.

[0014] The exhaust fan, the booster pump, the water level monitor and the temperature meter are all connected to a PLC controller.

[0015] A safety valve interface and a spare port are respectively provided on the shell; a drain valve interface is provided at the bottom of the shell; the safety valve interface, the spare port and the drain valve interface are all connected to the cavity; the safety valve interface is connected to a safety valve; and the drain valve interface is connected to a drain valve.

[0016] The beneficial effects of this application are:

[0017] The heating tube is a copper tube, which is installed in the shell, and both ends extend out of the shell; the input structure includes a circulating water inlet; the circulating water inlet is connected to the shell and communicated with the cavity; the circulating water inlet is respectively provided with a soft water inlet and a circulating water inlet pipe; the soft water inlet is connected with a soft water inlet pipe; the output structure includes an output port; the output port is provided on the shell and communicated with the cavity; the output port is respectively connected with a hot water output pipe and a steam output pipe;

[0018] A stainless steel cap (smoke hood) is installed 200-350mm above the top of the two smoke exhaust pipes for releasing the combustion smoke of the original tin bath, and a 304 stainless steel DN200 connecting pipe is used to lead out and collect the smoke duct, one end of the nitrogen intake pipe is connected to the collecting smoke duct, and the other end of the nitrogen intake pipe is connected to the air inlet of the heating pipe; the high-temperature nitrogen enters the heating pipe and is discharged from the nitrogen exhaust pipe;

[0019] When the device uses waste heat to process hot water, the soft water inlet valve is closed, and the circulating water inlet valve is opened; the steam output valve is closed, the hot water output valve is opened, and the output port is connected to the hot water output pipe; at this time, the circulating water enters the cavity from the circulating water inlet; the heating pipe heats the circulating water in the cavity, and the heated circulating water is sent to the user from the hot water output pipe, and is circulated and used through the circulating pump, so that it can be used for heating the living area in winter;

[0020] When the device uses waste heat to process steam, the circulating water inlet valve is closed, and the soft water inlet valve is opened; the hot water output valve is closed, and the steam output valve is opened, and the output port is connected to the steam output pipe; at this time, the soft water enters the cavity; the heating pipe heats the soft water in the cavity to generate steam, and the generated steam is output from the steam output pipe for heating the functional pipelines in the plant area;

[0021] This device can efficiently utilize the waste heat of the high-temperature nitrogen in the tin bath to process hot water or steam. The generated hot water can be used for heating the living area in winter, and the generated steam can be used for heating the functional pipelines in the factory area. The two modes can be switched freely according to needs; it is easy to operate and switch; at the same time, it efficiently utilizes thermal energy and effectively avoids energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the protective gas waste heat recovery device.

[0024] The marks in the above figure are:

[0025] The markings in the figure are:

[0026] 1. Evaporator,

[0027] 2. Shell,

[0028] 3. Heating pipe, 301, air inlet, 302, exhaust port,

[0029] 4. Nitrogen intake pipe, 401. Nitrogen exhaust pipe,

[0030] 5. Circulating water inlet, 501. Soft water inlet, 502. Circulating water inlet pipe, 503. Soft water inlet pipe,

[0031] 6. Circulating water inlet valve, 601, soft water inlet valve,

[0032] 7. Output port,

[0033] 8. Pressure gauge, 801. Pressure controller, 802. Electric air valve, 803. Exhaust fan,

[0034] 9. Booster pump, 901. Water level monitor,

[0035] 10. Thermometer,

[0036] 11. PLC controller,

[0037] 12. Safety valve interface, 121. Spare port, 122. Drain valve interface. DETAILED DESCRIPTION

[0038] The following is a further detailed explanation of the specific implementation methods of the utility model through the description of the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the utility model and facilitating its implementation.

[0039] Figure 1 The protective gas waste heat recovery device shown comprises an evaporator 1; the evaporator 1 comprises a shell 2 and a heating tube 3; a cavity is arranged between the shell 2 and the heating tube 3; an input structure and an output structure are respectively arranged on the shell 2; and high-temperature nitrogen is arranged in the heating tube 3. The input structure inputs circulating water or soft water into the cavity; the circulating water is heated by the heating tube 3 in the cavity and then outputs hot water from the output structure; the soft water is heated by the heating tube 3 in the cavity and then outputs steam from the output structure; the device can efficiently utilize the waste heat of the high-temperature nitrogen in the tin bath to process hot water or steam, and the generated hot water can be used for heating the living area in winter, and the generated steam can be used for heating the functional pipelines in the factory area, and the two modes can be switched freely according to demand; the operation is convenient and the switching is convenient; at the same time, the thermal energy is efficiently utilized, and energy waste is effectively avoided.

[0040] The heating tube 3 includes an air inlet 301 and an exhaust port 302; the air inlet 301 is connected to a nitrogen air inlet pipe 4; the exhaust port 302 is connected to a nitrogen exhaust pipe 401. The heating tube 3 is a copper tube, which is installed in the shell 2, and the two ends extend out of the shell 2; the air inlet 301 and the exhaust port 302 are respectively arranged at the two ends of the heating tube 3; a stainless steel cap (smoke hood) is installed 200-350mm above the top of the two exhaust pipes for dispersing the combustion smoke of the original tin bath, and a 304 stainless steel DN200 connecting pipe is used to lead out and aggregate the flue, one end of the nitrogen air inlet pipe 4 is connected to the aggregate flue, and the other end of the nitrogen air inlet pipe 4 is connected to the air inlet 301 of the heating tube 3; the high-temperature nitrogen enters the heating tube 3 and is discharged from the nitrogen exhaust pipe 401.

[0041] The input structure includes a circulating water inlet 5; the circulating water inlet 5 is connected to the housing 2 and communicated with the cavity; the circulating water inlet 5 is provided with a soft water inlet 501 and a circulating water inlet pipe 502; the soft water inlet 501 is connected with a soft water inlet pipe 503. Circulating water can enter the cavity from the circulating water inlet 5 through the circulating water inlet pipe 502; soft water can enter the circulating water inlet 5 through the soft water inlet pipe 503 and the soft water inlet 501, and then enter the cavity.

[0042] The circulating water inlet pipe 502 is connected to a circulating water inlet valve 6 ; the soft water inlet pipe 503 is connected to a soft water inlet valve 601 .

[0043] When processing hot water, close the soft water inlet valve 601 and open the circulating water inlet valve 6, and the circulating water enters the cavity from the circulating water inlet 5; when processing steam, close the circulating water inlet valve 6 and open the soft water inlet valve 601, and the soft water enters the cavity.

[0044] The output structure comprises an output port 7; the output port 7 is arranged on the shell 2 and communicated with the cavity; the output port 7 is respectively connected to a hot water output pipe and a steam output pipe.

[0045] The output port 7 is connected to the hot water output pipe and the steam output pipe respectively; when the device processes hot water, the output port 7 is controlled to be connected to the hot water output pipe; when the device processes steam, the output port 7 is controlled to be connected to the steam output pipe.

[0046] The hot water output pipe is connected with a hot water output valve; the steam output pipe is provided with a steam output valve. When the device processes hot water, the steam output valve is closed and the hot water output valve is opened, and the output port 7 is connected with the hot water output pipe; when the device processes steam, the hot water output valve is closed and the steam output valve is opened, and the output port 7 is connected with the steam output pipe.

[0047] The housing 2 is provided with a pressure gauge 8, which is connected to the cavity; the pressure gauge 8 is connected to a pressure controller 801; the nitrogen inlet pipe 4 is provided with an electric air valve 802; the pressure controller 801 is connected to the electric air valve 802; the nitrogen exhaust pipe 401 is connected to an exhaust fan 803. The pressure gauge 8 can detect the steam pressure in the cavity. When the pressure is too high, the pressure controller 801 controls the electric air valve 802 to close, stop the input of high-temperature nitrogen, and thus stop the production of steam in the cavity, which can ensure the stability of the pressure inside the evaporator 1 and avoid accidents; the exhaust fan 803 is a variable frequency fan, which can extract the high-temperature nitrogen from the heating tube 3, and can automatically adjust the frequency according to the internal temperature of the evaporator 1, so as to accurately control the heating efficiency of the heating tube 3.

[0048] A booster pump 9 is connected to the soft water inlet pipe 503; a water level monitor 901 is provided in the cavity; a thermometer 10 is provided on the housing 2; and the thermometer 10 is connected to the cavity. The booster pump 9 can pump soft water into the cavity to replenish water for the cavity when producing steam; the water level monitor 901 can measure the water level in the cavity in real time; and the thermometer 10 can measure the temperature in the cavity in real time.

[0049] The exhaust fan 803, the booster pump 9, the water level monitor 901 and the thermometer 10 are all connected to the PLC controller 11. When the water level monitor 901 detects that the water in the cavity is insufficient, the PLC controller 11 controls the booster pump 9 to replenish water in the cavity; when the thermometer 10 detects that the temperature in the cavity is too high or too low, the PLC controller 11 controls the exhaust fan 803 to increase or reduce the power to exhaust air, so as to maintain a stable temperature in the cavity.

[0050] The housing 2 is provided with a safety valve interface 12 and a spare port 121; the bottom of the housing 2 is provided with a drain valve interface 122; the safety valve interface 12, the spare port 121 and the drain valve interface 122 are all connected to the cavity; the safety valve interface 12 is connected to a safety valve; the drain valve interface 122 is connected to a drain valve. When the liquid level or air pressure in the cavity is too high, water or steam can be released through the safety valve interface 12; the spare port 121 has the same function as the output port 7, as an emergency plan; sewage or foreign matter deposited in the cavity can be discharged through the drain valve interface 122.

[0051] The specific working process of the utility model is as follows:

[0052] When the device uses waste heat to process hot water, the soft water inlet valve 601 is closed, and the circulating water inlet valve 6 is opened; the steam output valve is closed, the hot water output valve is opened, and the output port 7 is connected to the hot water output pipe; at this time, the circulating water enters the cavity from the circulating water inlet 5; the heating pipe 3 heats the circulating water in the cavity, and the heated circulating water is sent to the user from the hot water output pipe, and is circulated and used by the circulating pump, so that it can be used for heating the living area in winter;

[0053] When the device uses waste heat to process steam, the circulating water inlet valve 6 is closed, and the soft water inlet valve 601 is opened; the hot water output valve is closed, the steam output valve is opened, and the output port 7 is connected to the steam output pipe; at this time, the soft water enters the cavity; the heating pipe 3 heats the soft water in the cavity to generate steam, and the generated steam is output from the steam output pipe for heating the functional pipelines in the plant area.

[0054] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A protective gas waste heat recovery device, characterized in that: The invention comprises an evaporator (1); the evaporator (1) comprises a shell (2) and a heating tube (3); a cavity is provided between the shell (2) and the heating tube (3); an input structure and an output structure are respectively provided on the shell (2); and high-temperature nitrogen is provided in the heating tube (3).

2. A protective gas waste heat recovery device according to claim 1, characterized in that: The heating tube (3) comprises an air inlet (301) and an air outlet (302); the air inlet (301) is connected to a nitrogen air inlet pipe (4); and the air outlet (302) is connected to a nitrogen air outlet pipe (401).

3. A protective gas waste heat recovery device according to claim 2, characterized in that: The input structure comprises a circulating water inlet (5); the circulating water inlet (5) is connected to the housing (2) and communicates with the cavity; the circulating water inlet (5) is provided with a soft water inlet (501) and a circulating water inlet pipe (502); the soft water inlet (501) is connected to a soft water inlet pipe (503).

4. A protective gas waste heat recovery device according to claim 3, characterized in that: The circulating water inlet pipe (502) is connected to a circulating water inlet valve (6); the soft water inlet pipe (503) is connected to a soft water inlet valve (601).

5. A protective gas waste heat recovery device according to claim 4, characterized in that: The output structure comprises an output port (7); the output port (7) is arranged on the shell (2) and is in communication with the cavity; the output port (7) is respectively connected to a hot water output pipe and a steam output pipe.

6. A protective gas waste heat recovery device according to claim 5, characterized in that: The hot water output pipe is connected with a hot water output valve; the steam output pipe is provided with a steam output valve.

7. A protective gas waste heat recovery device according to any one of claims 3 to 6, characterized in that: The housing (2) is provided with a pressure gauge (8), the pressure gauge (8) being in communication with the cavity; the pressure gauge (8) is connected to a pressure controller (801); the nitrogen inlet pipe (4) is provided with an electric air valve (802); the pressure controller (801) is connected to the electric air valve (802); the nitrogen exhaust pipe (401) is connected to an exhaust fan (803).

8. A protective gas waste heat recovery device according to claim 7, characterized in that: The soft water inlet pipe (503) is connected to a booster pump (9); a water level monitor (901) is provided in the cavity; a thermometer (10) is provided on the housing (2); and the thermometer (10) is in communication with the cavity.

9. A protective gas waste heat recovery device according to claim 8, characterized in that: The exhaust fan (803), the booster pump (9), the water level monitor (901) and the temperature meter (10) are all connected to a PLC controller (11).

10. A protective gas waste heat recovery device according to claim 9, characterized in that: The housing (2) is provided with a safety valve interface (12) and a spare port (121), respectively; the bottom of the housing (2) is provided with a sewage valve interface (122); the safety valve interface (12), the spare port (121) and the sewage valve interface (122) are all in communication with the cavity; the safety valve interface (12) is connected to a safety valve; and the sewage valve interface (122) is connected to a sewage valve.

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