Heat-conducting oil furnace device and control method thereof

Abstract

The invention discloses a heat-conducting oil furnace device and a control method thereof. The heat-conducting oil furnace device comprises a heat-conducting oil furnace, a combustor, an air preheater and a fan, the combustor is arranged below the heat-conducting oil furnace and heats the heat-conducting oil furnace through combustion; the heat conduction oil furnace is provided with a heat flow outlet which is connected with a first inlet of the air preheater through a heat flow conveying pipeline. Heat flow conveyed from the heat flow outlet is output through a first outlet of the air preheater; a second inlet of the air preheater is connected with a fan; air is preheated in the air preheater and then is fed into the combustor through a second outlet of the air preheater and an air conveying pipeline; a cavity is formed in the bottom of the heat-conducting oil furnace; the cavity is provided with a plurality of combustion ports, and stripping tail gas entering the cavity can be combusted at the combustion ports instead of being combusted in the combustor. According to the heat conduction oil furnace device and the control method thereof, stable operation of the heat medium furnace can be guaranteed, and it is guaranteed that indexes such as the nitrogen oxide content in flue gas emission of the heat medium furnace do not exceed the standard risk.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester production equipment and relates to a heat-conducting oil furnace, in particular to a heat-conducting oil furnace device and a control method thereof. Background Art

[0002] In the production process of polyester equipment, purified terephthalic acid (PTA) and ethylene glycol (EG) are used as raw materials, ethylene glycol antimony is used as catalyst, and a five-reactor process of direct esterification and continuous polycondensation is adopted to produce industrial yarn-grade polyester basic chips. The water generated by the esterification reaction of polyester PTA and EG enters the ethylene glycol separation tower together with the ethylene glycol vapor to separate the water and ethylene glycol in the mixed steam of the two esterification reactors. The top steam enters the condensate collection tank after condensation by the air cooler; a part of it is used as reflux liquid, and the rest is sent to the esterification water stripping treatment. The esterification water wastewater mainly contains acetaldehyde, ethylene glycol, 2-MD, pentane dioxide and other organic substances, with a content of 1-2%, and a chemical oxygen demand COD value of up to 30000-50000 mg / l. After stripping, the low-boiling organic substances such as acetaldehyde are sent to the heat medium furnace for combustion treatment along with the stripping tail gas; the stripping tail gas has a certain calorific value due to the organic matter. The wastewater after stripping has a chemical oxygen demand (COD) value of 2000-5000 mg / l and enters the sewage station for biochemical deep treatment.

[0003] At present, the treatment process of esterification water in the polyester industry is to use stripping treatment. The stripping tail gas is directly connected to the furnace of the heat medium furnace through a pipeline, or mixed with air in the hot air section before entering the furnace for combustion. Direct connection to the furnace for combustion is generally a coal furnace or a water-coal slurry furnace; the stripping tail gas is mixed with hot air in the hot air section and then enters the burner as combustion-supporting air for combustion. This type of heat medium furnace is generally a natural gas boiler.

[0004] In actual use, when the water content of the stripping gas is high, this type of access form can easily cause water to enter the flame detector set around the flame, resulting in a false alarm of flame extinction and alarm chain shutdown. The water inflow of the flame detector is due to the presence of a large number of water droplets around the flame, which can easily enter the flame detector set next to the flame; or cause the flame detector (usually a photosensitive device) to be blocked by water droplets and unable to detect the flame. If the water content of the stripping tail gas is high, the flame ignition will be unstable when entering the burner for combustion, resulting in an actual flameout image.

[0005] At the same time, the centralized and combustion-supporting air entering the furnace will also cause the center flame temperature to be high, the nitrogen oxide content to be high, and there is a risk of excessive flue gas nitrogen oxide content. In addition, since polyester is produced continuously, abnormal shutdown of the furnace will lead to abnormal heat, which will lead to unstable production, reduced product quality and other economic losses; abnormal heating and insufficient supply will seriously cause risks such as equipment damage.

[0006] In view of this, there is an urgent need to design a new thermal oil furnace device to overcome at least part of the above-mentioned defects of the existing thermal oil furnace devices. Summary of the invention

[0007] The present invention provides a heat transfer oil furnace device and a control method thereof, which can ensure the stable operation of the heat medium furnace, the heat medium furnace can stably burn and supply heat, and ensure stable production.

[0008] In order to solve the above technical problems, according to one aspect of the present invention, the following technical solution is adopted:

[0009] A thermal oil furnace device, comprising: a thermal oil furnace, a burner, an air preheater and a fan;

[0010] The burner is arranged below the thermal oil furnace, and the burner heats the thermal oil furnace by combustion; the thermal oil furnace is provided with a heat flow outlet, and the heat flow outlet is connected to the first inlet of the air preheater through a heat flow delivery pipeline; the heat flow delivered from the heat flow outlet is output through the first outlet of the air preheater;

[0011] The second inlet of the air preheater is connected to a fan, and the fan delivers air into the air preheater; after the air is preheated in the air preheater, it is delivered to the burner through the second outlet of the air preheater and the air delivery pipeline;

[0012] A cavity is provided above the burner and at the bottom of the thermal oil furnace, and the inlet of the cavity is connected to the stripping exhaust gas delivery end; the cavity is provided with a plurality of combustion ports, and the stripping exhaust gas entering the cavity can burn at the combustion ports instead of burning in the burner, thereby preventing the moisture contained in the stripping exhaust gas from affecting the flame combustion of the burner and / or avoiding affecting the detection of the flame by the flame detector.

[0013] As an embodiment of the present invention, a plurality of holes are provided on the upper portion of the cavity, each hole is respectively connected to a first end of a burner, and a second end of each burner serves as the burner port.

[0014] As an implementation mode of the present invention, the cavity is annular; each burner is a hollow cylinder, and each burner is longitudinally arranged at the upper part of the cavity.

[0015] As an embodiment of the present invention, the stripping tail gas delivery end is connected to the thermal oil furnace through a stripping tail gas delivery pipeline, and the stripping tail gas delivery pipeline is connected to the stripping tail gas exhaust pipeline; the stripping tail gas delivery pipeline is provided with a first valve group, and the stripping tail gas exhaust pipeline is provided with a second valve group.

[0016] As an embodiment of the present invention, the stripping tail gas delivery pipeline is provided with a first sensor group, the first sensor group includes a first pressure sensor, a first temperature sensor and a first flow sensor; the first pressure sensor, the first temperature sensor and the first flow sensor are used to sense the air pressure, temperature and gas flow in the stripping tail gas delivery pipeline respectively;

[0017] The stripping tail gas exhaust pipeline is provided with a second sensor group, the second sensor group includes a second pressure sensor and a second flow sensor; the second pressure sensor and the second flow sensor are used to sense the air pressure and gas flow in the stripping tail gas exhaust pipeline respectively;

[0018] The heat flow transport pipeline is provided with a third sensor group, and the third sensor group includes a third pressure sensor, a third temperature sensor and a third flow sensor; the third pressure sensor, the third temperature sensor and the third flow sensor are used to sense the air pressure, temperature and gas flow in the heat flow transport pipeline respectively;

[0019] The air delivery pipeline is provided with a fourth sensor group, which includes a fourth flow sensor, a fourth temperature sensor and a fourth pressure sensor; the fourth flow sensor, the fourth temperature sensor and the fourth pressure sensor are respectively used to sense the gas flow, temperature and air pressure in the air delivery pipeline.

[0020] As an embodiment of the present invention, the thermal oil furnace device further includes a stripping tower tail gas alarm module, a stripping tower tail gas interlocking module and a stripping tower tail gas cut-off protection module;

[0021] When the stripping pressure is too low or too high, the stripping tower tail gas alarm module will alarm; when it is detected that the stripping pressure exceeds the set high and low pressure interlocking value, the stripping tower tail gas interlocking module will interlock and shut down the stripping tail gas to ensure stable operation;

[0022] When the heat medium furnace load is lower than the set threshold, the stripping tower tail gas cut-off protection module cuts off the stripping tail gas from entering the furnace to protect the burner.

[0023] As an embodiment of the present invention, the stripping tail gas delivery pipeline passes through the burner and is connected to the cavity located above the burner.

[0024] According to another aspect of the present invention, the following technical solution is adopted: a control method of the above-mentioned thermal oil furnace device, the control method comprising:

[0025] When the operating load of the heat medium furnace is higher than the set threshold, the system automatically sends a signal to allow the stripping tail gas to be put into use;

[0026] After the signal is sent, the fully automatic control system of the stripping tail gas transmission pipeline controls the inlet valve to open; the pipeline and valve are self-checked for sealing. After the self-check is successful, the furnace cut-off valve is opened and the stripping tail gas is fed into the burner for combustion;

[0027] The load of the stripping tail gas entering the furnace is adjusted according to the valve opening to ensure the stability of the stripping tower process control and the stable combustion control of the heat medium furnace; at the same time, the stripping tail gas entering the furnace is burned as fuel to save fuel;

[0028] When the flue gas oxygen content probe is lower than the set value, the fan frequency is automatically adjusted and the fan air volume is automatically increased to maintain sufficient air volume for furnace combustion and maintain the oxygen content control index.

[0029] As an embodiment of the present invention, the thermal oil furnace device further includes a stripping tower tail gas alarm module, a stripping tower tail gas interlocking module and a stripping tower tail gas cut-off protection module;

[0030] When the stripping pressure is too low or too high, the stripping tower tail gas alarm module will alarm; when it is detected that the stripping pressure exceeds the set high and low pressure interlocking value, the stripping tower tail gas interlocking module will interlock and shut down the stripping tail gas to ensure stable operation;

[0031] When the heat medium furnace load is lower than the set threshold, the stripping tower tail gas cut-off protection module cuts off the stripping tail gas from entering the furnace to protect the burner.

[0032] As an implementation manner of the present invention, the threshold is set to 30%.

[0033] The beneficial effects of the present invention are as follows: the heat transfer oil furnace device and the control method thereof proposed in the present invention can ensure the stable operation of the heat medium furnace, and completely solve some problems of the original equipment such as abnormal flameout and shutdown of the heat medium furnace due to the water content in the stripping tail gas, water ingress corrosion and short circuit of the instrument, and water leakage and corrosion of the burner; the heat medium furnace can stably burn and supply heat, ensure stable production, and also ensure that indicators such as the nitrogen oxide content in the flue gas emitted by the heat medium furnace are not at risk of exceeding the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the layout of a thermal oil furnace device in one embodiment of the present invention.

[0035] Figure 2 It is a schematic structural diagram (top view) of a stripping tail gas combustion chamber in one embodiment of the present invention.

[0036] Figure 3 It is a structural schematic diagram (side view) of a stripping tail gas combustion chamber in one embodiment of the present invention. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0039] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced within the scope of the present invention.

[0040] The description of the steps in each embodiment in the specification is only for the convenience of explanation, and the implementation method of the present application is not limited by the order of implementation of the steps.

[0041] The term “connection” in the specification includes both direct connection and indirect connection.

[0042] The present invention discloses a thermal oil furnace device. Figure 1 This is a schematic diagram of the layout of a thermal oil furnace device in one embodiment of the present invention; please refer to Figure 1 The thermal oil furnace device includes: a thermal oil furnace 1, a burner 2, an air preheater 3 and a fan 4 (such as a blower).

[0043] The burner 2 is arranged below the thermal oil furnace 1 , and the burner 2 heats the thermal oil furnace 1 by combustion; a flame detector 201 may be arranged in the burner 2 to detect whether there is a flame and / or the flame intensity in the burner 2 .

[0044] The thermal oil furnace 1 is provided with a heat flow outlet 101, and the heat flow outlet 101 is connected to the first inlet 301 of the air preheater 3 through the heat flow delivery pipeline 16; the heat flow delivered from the heat flow outlet 101 is output through the first outlet 302 of the air preheater 3 (such as connected to the chimney 7 through the output pipeline). The first outlet 302 can be provided with a tenth sensor group 40; the tenth sensor group 40 can include a temperature sensor and an oxygen content sensor.

[0045] The second inlet 304 of the air preheater 3 is connected to the fan 4, and the fan 4 delivers air into the air preheater 3; after being preheated in the air preheater 3, the air is delivered into the burner 2 through the second outlet 303 of the air preheater 3 and the air delivery pipeline 15. The stripping tail gas delivery end 6 is connected to the thermal oil furnace 1 through the stripping tail gas delivery pipeline 11, and the stripping tail gas exhaust pipeline 12 is connected to the stripping tail gas delivery pipeline 11.

[0046] A cavity 5 is provided above the burner 2 and at the bottom of the thermal oil furnace 1 . Figure 2 , Figure 3This is a schematic diagram of the structure of the stripping tail gas combustion chamber in one embodiment of the present invention; please refer to Figure 2 , Figure 3 The inlet 54 of the cavity 5 is connected to the stripping exhaust gas delivery end 6; the cavity 5 is provided with a plurality of combustion ports 51, and the stripping exhaust gas entering the cavity 5 can burn at the combustion ports 51 instead of burning in the burner 2, so as to avoid the moisture contained in the stripping exhaust gas affecting the flame combustion of the burner 2 and / or avoiding affecting the detection of the flame by the flame detector.

[0047] In one embodiment of the present invention, the cavity 5 is annular; a plurality of holes 52 are provided at the upper portion of the cavity 5, each hole 52 is connected to a first end of a burner 53, and a second end of each burner 53 serves as the burner port 51. Each burner is a hollow cylinder, and each burner is longitudinally arranged at the upper portion of the cavity 5.

[0048] The thermal oil furnace device has several conveying pipelines. In one embodiment of the present invention, the several conveying pipelines include a heat fluid conveying pipeline 16, an air conveying pipeline 15, a stripping tail gas conveying pipeline 11 and a stripping tail gas exhaust pipeline 12, and may also include a second stripping tail gas exhaust pipeline 13 and a thermal oil conveying pipeline 14.

[0049] The second stripping tail gas exhaust pipeline 13 is connected to the thermal oil furnace 1, and can exhaust the stripping tail gas in the thermal oil furnace 1; the second stripping tail gas exhaust pipeline 13 is provided with a fifth sensor group 33, and the fifth sensor group 33 may include a temperature sensor, a pressure sensor, an airflow sensor, etc., which are respectively used to sense the temperature, air pressure and air flow in the second stripping tail gas exhaust pipeline 13.

[0050] The heat transfer oil delivery pipeline 14 is connected to the heat transfer oil furnace 1 and is used to deliver heat transfer oil to the heat transfer oil furnace 1. The heat transfer oil delivery pipeline 14 is provided with a sixth sensor group 34, which may include a temperature sensor and a flow sensor, respectively used to sense the temperature and flow of the heat transfer oil delivery pipeline 14. The different temperature sensors provided in the heat transfer oil delivery pipeline 14 can sense the inlet and outlet temperatures of the heat transfer oil, and the provided flow sensor senses the delivery volume of the heat transfer oil; the heat transfer oil furnace 1 is also provided with a temperature sensor to sense the temperature inside the furnace.

[0051] The stripping tail gas delivery pipeline 11 is provided with a first valve group 21 and a first sensor group 31, the stripping tail gas exhaust pipeline 12 is provided with a second valve group 22 and a second sensor group 32; the heat flow delivery pipeline 16 is provided with a third sensor group 36, and the air delivery pipeline 15 is provided with a fourth sensor group 37. The system can control the opening and closing of the first valve group 21 and the second valve group 22 as needed, so as to adjust the amount of stripping tail gas delivered to the thermal oil furnace 1.

[0052] The stripping tail gas delivery pipeline 11 is also connected to the burner 2 through the burner inlet pipeline 17, and the burner inlet pipeline 17 is provided with a third valve group 23 and a ninth sensor group 35. The third valve group 23 may include a valve that can automatically adjust the opening according to the pressure, an automatic drain valve, etc.; the ninth sensor group 35 may include a temperature sensor and a pressure sensor to sense the temperature and air pressure in the burner inlet pipeline 17.

[0053] The thermal oil furnace device may further include a stripper tail gas alarm module, a stripper tail gas interlocking module and a stripper tail gas cut-off protection module. When the first pressure sensor detects that the stripping pressure is too low or too high, the stripper tail gas alarm module will sound an alarm; when the first pressure sensor detects that the stripping pressure exceeds the set high and low pressure interlocking value, the stripper tail gas interlocking module will interlock and shut down the stripper tail gas to ensure stable operation. When the heat medium furnace load is lower than the set threshold value (such as 30%, of course, it can also be other values), the stripper tail gas cut-off protection module will cut off the stripper tail gas from entering the furnace to protect the burner.

[0054] The main control circuit 8 is respectively connected to the fan 4, the first valve group 21, the second valve group 22, the first sensor group 31, the second sensor group 32, the third sensor group 36 and the fourth sensor group 37. The output end of the first sensor group 31, the output end of the second sensor group 32, the output end of the third sensor group 36 and the output end of the fourth sensor group 37 are respectively connected to the input end of the main control circuit 8; the output end of the main control circuit 8 is respectively connected to the input end of the fan 4, the input end of the first valve group 21 and the input end of the second valve group 22. In one embodiment, the first valve group 21 includes a first solenoid valve, and the second valve group 22 includes a second solenoid valve.

[0055] In one embodiment of the present invention, the first sensor group 31 includes a first pressure sensor, a first temperature sensor and a first flow sensor; the first pressure sensor, the first temperature sensor and the first flow sensor are used to sense the air pressure, temperature and gas flow in the stripping tail gas delivery pipeline respectively. The second sensor group 32 includes a second pressure sensor and a second flow sensor; the second pressure sensor and the second flow sensor are used to sense the air pressure and gas flow in the stripping tail gas exhaust pipeline respectively.

[0056] The third sensor group 36 includes a third pressure sensor, a third temperature sensor and a third flow sensor; the third pressure sensor, the third temperature sensor and the third flow sensor are used to sense the air pressure, temperature and gas flow in the heat flow transmission pipeline respectively. The fourth sensor group 37 includes a fourth flow sensor, a fourth temperature sensor and a fourth pressure sensor; the fourth flow sensor, the fourth temperature sensor and the fourth pressure sensor are used to sense the gas flow, temperature and air pressure in the air transmission pipeline respectively.

[0057] The fan 4 may also include a seventh sensor group 38, which may include a temperature sensor, a pressure sensor and an air flow sensor, respectively sensing the temperature, air pressure and air flow of the delivery pipeline connected to the fan 4. In one embodiment, the fan is provided with a pressure sensor, an air flow sensor and an air valve controller.

[0058] The seventh sensor group 38 can be used to obtain the temperature of the cold air entering the air heat exchanger 3, and the fourth sensor group 37 can be used to obtain the temperature of the air flow output from the air heat exchanger 3. The third sensor group 36 can be used to obtain the temperature of the flue gas entering the air heat exchanger 3, and the tenth sensor group 40 can be used to obtain the temperature of the flue gas output from the air heat exchanger 3. In addition, the oxygen content sensor of the tenth sensor group 40 can also sense the oxygen content in the flue gas.

[0059] The chimney 7 may be provided with an eighth sensor group 39, which may include a temperature sensor and a pressure sensor, respectively sensing the temperature and air pressure in the chimney 7. In addition, the chimney 7 may also be equipped with an online monitoring sensor group for detecting substances such as VOC, oxides, sulfur dioxide, and smoke.

[0060] In one embodiment of the present invention, the setting area of ​​the thermal oil furnace 1 is provided with a first temperature sensor, the setting area of ​​the burner is provided with a second temperature sensor, and the setting area of ​​the air preheater is provided with a third temperature sensor; the first sensor group, the second sensor group, the third sensor group and the fourth sensor group respectively include a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor and a seventh temperature sensor. The output ends of the first temperature sensor, the second temperature sensor, the third sensor group, the fourth temperature sensor, the fifth temperature sensor, the sixth temperature sensor and the seventh temperature sensor are respectively connected to the input end of the main control circuit to send the sensed temperature data to the main control circuit.

[0061] The present invention further discloses a control method for the above-mentioned thermal oil furnace device, the control method comprising:

[0062] When the operating load of the heat medium furnace is higher than the set threshold (such as 30%, of course, it can also be other values), the system automatically sends a signal to allow the stripping tail gas to be put into use;

[0063] After the signal is sent, the fully automatic control system of the stripping tail gas pipeline controls the inlet valve to open; the pipeline and valve are self-checked for sealing. After the self-check is successful, the furnace cut-off valve is opened and the stripping tail gas is fed into the burner for combustion;

[0064] The stripping tail gas inlet load is adjusted according to the valve opening to ensure the stability of the stripping tower process control and the stable combustion control of the heat medium furnace; at the same time, the stripping tail gas is burned as fuel in the furnace to save fuel;

[0065] When the flue gas oxygen content probe is lower than the set value, the fan frequency is automatically adjusted and the fan air volume is automatically increased to maintain sufficient air volume for furnace combustion and maintain the oxygen content control index.

[0066] In one use scenario of the present invention, the thermal oil furnace device may further include a stripper tail gas alarm module, a stripper tail gas interlocking module, and a stripper tail gas shut-off protection module. When the stripper pressure is detected to be too low or too high, an alarm is issued through the stripper tail gas alarm module; when the stripper pressure is detected to exceed the set high and low pressure interlocking value, the stripper tail gas interlocking module is used to shut down the stripper tail gas to ensure stable operation. When the heat medium furnace load is lower than the set threshold value (such as 30%, of course, it can also be other values), the stripper tail gas shut-off protection module is used to cut off the stripper tail gas from entering the furnace to protect the burner.

[0067] In summary, the heat transfer oil furnace device and the control method thereof proposed in the present invention can ensure the stable operation of the heat medium furnace, and completely solve some problems of the original equipment caused by the water content of the stripping tail gas, such as abnormal flameout and shutdown of the heat medium furnace, water corrosion and short circuit of the instrument, and water leakage and corrosion of the burner; the heat medium furnace can stably burn and supply heat, ensure stable production, and also ensure that indicators such as the nitrogen oxide content in the flue gas emitted by the heat medium furnace are not at risk of exceeding the standard.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The description and application of the present invention here are illustrative, and it is not intended to limit the scope of the present invention to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and change of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent parts are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the present invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the present invention. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the present invention.

Claims

1. A thermal oil furnace device, It is characterized in that The thermal oil furnace device comprises: a thermal oil furnace, a burner, an air preheater and a fan; The burner is arranged below the thermal oil furnace, and the burner heats the thermal oil furnace by combustion; the thermal oil furnace is provided with a heat flow outlet, and the heat flow outlet is connected to the first inlet of the air preheater through a heat flow delivery pipeline; the heat flow delivered from the heat flow outlet is output through the first outlet of the air preheater; The second inlet of the air preheater is connected to a fan, and the fan delivers air into the air preheater; after the air is preheated in the air preheater, it is delivered to the burner through the second outlet of the air preheater and the air delivery pipeline; A cavity is provided above the burner and at the bottom of the thermal oil furnace, and the inlet of the cavity is connected to the stripping exhaust gas delivery end; the cavity is provided with a plurality of combustion ports, and the stripping exhaust gas entering the cavity can burn at the combustion ports instead of burning in the burner, thereby preventing the moisture contained in the stripping exhaust gas from affecting the flame combustion of the burner and / or avoiding affecting the detection of the flame by the flame detector.

2. The thermal oil furnace device according to claim 1, Features: A plurality of holes are arranged on the upper part of the cavity, each hole is respectively connected to a first end of a burner, and a second end of each burner serves as the burner port.

3. The thermal oil furnace device according to claim 2, Features: The cavity is annular; each burner is a hollow cylinder, and each burner is longitudinally arranged at the upper part of the cavity.

4. The thermal oil furnace device according to claim 1, Features: The stripping tail gas delivery end is connected to the thermal oil furnace through the stripping tail gas delivery pipeline, and the stripping tail gas delivery pipeline is connected to the stripping tail gas exhaust pipeline; the stripping tail gas delivery pipeline is provided with a first valve group, and the stripping tail gas exhaust pipeline is provided with a second valve group.

5. The thermal oil furnace device according to claim 4, Features: The stripping tail gas delivery pipeline is provided with a first sensor group, which includes a first pressure sensor, a first temperature sensor and a first flow sensor; the first pressure sensor, the first temperature sensor and the first flow sensor are used to sense the air pressure, temperature and gas flow in the stripping tail gas delivery pipeline respectively; The stripping tail gas exhaust pipeline is provided with a second sensor group, the second sensor group includes a second pressure sensor and a second flow sensor; the second pressure sensor and the second flow sensor are used to sense the air pressure and gas flow in the stripping tail gas exhaust pipeline respectively; The heat flow transport pipeline is provided with a third sensor group, and the third sensor group includes a third pressure sensor, a third temperature sensor and a third flow sensor; the third pressure sensor, the third temperature sensor and the third flow sensor are used to sense the air pressure, temperature and gas flow in the heat flow transport pipeline respectively; The air delivery pipeline is provided with a fourth sensor group, which includes a fourth flow sensor, a fourth temperature sensor and a fourth pressure sensor; the fourth flow sensor, the fourth temperature sensor and the fourth pressure sensor are respectively used to sense the gas flow, temperature and air pressure in the air delivery pipeline.

6. The control method according to claim 5, Features: The thermal oil furnace device further includes a stripping tower tail gas alarm module, a stripping tower tail gas interlocking module and a stripping tower tail gas cut-off protection module; When the stripping pressure is too low or too high, the stripping tower tail gas alarm module will alarm; when it is detected that the stripping pressure exceeds the set high and low pressure interlocking value, the stripping tower tail gas interlocking module will interlock and shut down the stripping tail gas to ensure stable operation; When the heat medium furnace load is lower than the set threshold, the stripping tower tail gas cut-off protection module cuts off the stripping tail gas from entering the furnace to protect the burner.

7. The thermal oil furnace device according to claim 1, Features: The stripping tail gas delivery pipeline passes through the burner and is connected to the cavity located above the burner.

8. A method for controlling the thermal oil furnace device according to any one of claims 1 to 7, It is characterized in that The control method comprises: When the operating load of the heat medium furnace is higher than the set threshold, the system automatically sends a signal to allow the stripping tail gas to be put into use; After the signal is sent, the fully automatic control system of the stripping tail gas transmission pipeline controls the inlet valve to open; the pipeline and valve are self-checked for sealing. After the self-check is successful, the furnace cut-off valve is opened and the stripping tail gas is fed into the burner for combustion; The stripping tail gas inlet load is adjusted according to the valve opening to ensure the stability of the stripping tower process control and the stable combustion control of the heat medium furnace; at the same time, the stripping tail gas is burned as fuel in the furnace to save fuel; When the flue gas oxygen content probe is lower than the set value, the fan frequency is automatically adjusted and the fan air volume is automatically increased to maintain sufficient air volume for furnace combustion and maintain the oxygen content control index.

9. The control method according to claim 8, Features: The thermal oil furnace device further includes a stripping tower tail gas alarm module, a stripping tower tail gas interlocking module and a stripping tower tail gas cut-off protection module; When the stripping pressure is too low or too high, the stripping tower tail gas alarm module will alarm; when it is detected that the stripping pressure exceeds the set high and low pressure interlocking value, the stripping tower tail gas interlocking module will interlock and shut down the stripping tail gas to ensure stable operation; When the heat medium furnace load is lower than the set threshold, the stripping tower tail gas cut-off protection module cuts off the stripping tail gas from entering the furnace to protect the burner.

10. The control method according to claim 8, Features: Set the threshold to 30%.

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