A device for reusing flue gas from a para-ethylphenol alkali melting furnace to heat a sodium sulfonate tank

Abstract

The utility model provides a device for reusing flue gas from an ethylphenol alkali melting furnace to heat a sodium sulfonate tank, comprising an alkali melting furnace, an alkali melting kettle arranged in the alkali melting furnace, a burner arranged at the bottom of the alkali melting kettle in the alkali melting furnace, the burner connected to an induced draft fan pipeline and a natural gas pipeline, a heating chamber formed between the inner wall of the alkali melting furnace and the outer wall of the alkali melting kettle, and a flue gas channel opened on the furnace wall of the alkali melting furnace. The device recycles the flue gas generated in the heating process in the alkali melting kettle, thereby saving energy and reducing emissions.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas waste heat utilization, in particular to a device for reusing flue gas from a para-ethylphenol alkali melting furnace to heat a sodium sulfonate tank. Background Art

[0002] In the alkali melting section of the ethylphenol production process, it is necessary to heat the caustic soda flakes by burning natural gas, add sodium sulfonate solution, and perform alkaline hydrolysis. During this period, the sodium sulfonate tank needs to maintain a temperature of 80-90°C to make the sodium sulfonate liquefied and maintain the fluidity of the drop. The traditional method requires steam to be used for insulation through the built-in coil. Because it needs to be kept warm continuously, the amount of steam used is very large. The temperature of the flue gas generated by the combustion of natural gas in the alkali melting furnace is sufficient to keep it warm. However, the existing technology often directly discharges the flue gas generated by the combustion of natural gas in the alkali melting furnace, wasting a lot of energy. Utility Model Content

[0003] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0004] A device for reusing flue gas from an ethylphenol alkali melting furnace to heat a sodium sulfonate tank comprises an alkali melting furnace, wherein an alkali melting kettle is arranged in the alkali melting furnace, a burner is arranged at the bottom of the alkali melting kettle in the alkali melting furnace, the burner is connected to an induced draft fan pipeline and a natural gas pipeline, a heating chamber is formed between the inner wall of the alkali melting furnace and the outer wall of the alkali melting kettle, a flue gas channel is opened on the furnace wall of the alkali melting furnace, the flue gas channel branches into a flue gas branch channel 1 and a flue gas branch channel 2, the flue gas branch channel 1 is connected to a jacketed sodium sulfonate heat exchanger, the jacketed sodium sulfonate heat exchanger comprises an inner tank body and an outer tank body, the lower part of the outer tank body is connected to the flue gas branch channel 1, the upper part of the outer tank body is connected to a flue gas outlet pipe, the flue gas outlet pipe is connected to a flue gas spray device, and the flue gas branch channel 2 is connected to the flue gas outlet pipe.

[0005] The first smoke branch channel is provided with a first temperature control valve, and the second smoke branch channel is provided with a second temperature control valve.

[0006] The bottom of the inner tank body is connected with a sodium sulfonate dripping pipeline, and the discharge port of the sodium sulfonate dripping pipeline is placed in the alkali melting kettle.

[0007] A temperature sensor is provided in the inner tank body, and the temperature sensor is electrically connected to a signal input end of a controller, and a signal output end of the controller is electrically connected to a first temperature control valve and a second temperature control valve.

[0008] As a preferred solution, the induced draft fan duct is connected to the induced draft fan.

[0009] As a preferred solution, the natural gas pipeline is connected to a natural gas pressure regulating station.

[0010] As a preferred solution, a first motor stirrer is provided in the alkali melting kettle, and a second motor stirrer is provided in the inner tank body.

[0011] As a preferred solution, the bottom of the alkali melting kettle is connected to a discharge pipe.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the burner of the utility model is connected to the induced draft fan pipeline and the natural gas pipeline, oxygen and natural gas are mixed in the burner and then burned, the heat generated heats the alkali melting kettle, and a large amount of flue gas generated by the combustion enters the flue gas channel. The flue gas entering the flue gas channel contains a large amount of heat, and one branch enters the outer tank body of the jacketed sodium sulfonate heat exchanger through the flue gas branch channel, and heats the sodium sulfate solution contained in the inner tank body, so that the temperature in the inner tank body is maintained at 80-90°C, the sodium sulfonate is in a liquefied state, and the fluidity of the dripping is maintained. The heated sodium sulfate solution flows into the alkali melting kettle through the sodium sulfonate dripping pipeline at the bottom of the inner tank body, and reacts with the heated caustic soda flakes in the alkali melting kettle for alkaline hydrolysis. The flue gas generated during the heating process in the alkali melting kettle is reused for secondary use, which saves energy and reduces emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0014] Figure 1 It is a schematic diagram of the connection structure of the utility model. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0016] A device for reusing flue gas from an ethylphenol alkali melting furnace to heat a sodium sulfonate tank comprises an alkali melting furnace 1, wherein an alkali melting kettle 2 is arranged in the alkali melting furnace 1, a burner 3 is arranged at the bottom of the alkali melting kettle 2 in the alkali melting furnace 1, the burner 3 is connected to an induced draft fan pipeline 4 and a natural gas pipeline 5, a heating chamber 6 is formed between the inner wall of the alkali melting furnace 1 and the outer wall of the alkali melting kettle 2, a flue gas channel 7 is opened on the furnace wall of the alkali melting furnace 1, the flue gas channel 7 branches into a flue gas branch channel 1 71 and a flue gas branch channel 2 72, the flue gas branch channel 1 71 is connected to a jacketed sodium sulfonate heat exchanger 8, the jacketed sodium sulfonate heat exchanger 8 comprises an inner tank body 81 and an outer tank body 82, the lower part of the outer tank body 82 is connected to the flue gas branch channel 1 71, the upper part of the outer tank body 82 is connected to a flue gas outlet pipe 83, the flue gas outlet pipe 83 is connected to a flue gas spray device 9, and the flue gas branch channel 2 72 is connected to the flue gas outlet pipe 83.

[0017] The smoke branch channel 1 71 is provided with a temperature control valve 1 73 , and the smoke branch channel 2 72 is provided with a temperature control valve 2 74 .

[0018] A sodium sulfonate dripping pipe 10 is connected to the bottom of the inner tank body 81 , and a discharge port 11 of the sodium sulfonate dripping pipe 10 is placed in the alkali melting kettle 2 .

[0019] A temperature sensor 12 is disposed in the inner tank body 81 . The temperature sensor 12 is electrically connected to a signal input end of a controller 13 . A signal output end of the controller 13 is electrically connected to a temperature control valve 1 73 and a temperature control valve 2 74 .

[0020] Furthermore, the induced draft fan duct 4 is connected to the induced draft fan 14 .

[0021] Furthermore, the natural gas pipeline 5 is connected to a natural gas pressure regulating station 15 .

[0022] Furthermore, the alkali melting kettle 2 is provided with a motor stirrer 16, which ensures that the materials in the alkali melting kettle 2 are heated evenly, and the inner tank body 81 is provided with a motor stirrer 17, which ensures that the materials in the inner tank body 81 are heated evenly.

[0023] Furthermore, the bottom of the alkali melting kettle 2 is connected to a discharge pipe 18 .

[0024] The burner 3 is connected to the induced draft fan pipeline 4 and the natural gas pipeline 5. Oxygen and natural gas are mixed in the burner 3 and then burned. The heat generated heats the alkali melting kettle 2. At the same time, a large amount of flue gas generated by the combustion enters the flue gas channel 7. The flue gas entering the flue gas channel 7 contains a large amount of heat. One branch enters the outer tank body 82 of the jacketed sodium sulfonate heat exchanger 8 through the flue gas branch channel 1 71, and heats the sodium sulfate solution contained in the inner tank body 81, so that the temperature in the inner tank body 81 is maintained at 80-90°C, so that the sodium sulfonate is in a liquefied state and the fluidity of the dripping is maintained. The heated sodium sulfate solution flows into the alkali melting kettle 2 through the sodium sulfonate dripping pipeline 10 at the bottom of the inner tank body 81, and undergoes an alkaline hydrolysis reaction with the heated caustic soda flakes in the alkali melting kettle 2.

[0025] A part of the smoke entering the smoke channel 7 is sent to the smoke outlet pipe 83 through the smoke branch channel 2 72, and is discharged after being processed by the smoke spray device 9.

[0026] The amount of smoke sent to the smoke branch channel 1 71 and the smoke branch channel 2 72 is controlled by the temperature control valve 1 73 and the temperature control valve 2 74. The temperature sensor 12 in the inner tank body 81 uploads the temperature information of the inner tank body 81 to the controller 13, and the controller 13 controls the opening and closing amount of the temperature control valve 1 73 and the temperature control valve 2 74 according to the temperature of the inner tank body 81, thereby controlling the smoke flow. When the temperature of the inner tank body 81 is in the rising stage, the temperature control valve 1 73 is gradually closed, and the temperature control valve 2 74 is gradually opened.

[0027] Assuming the temperature of the inner tank body 81 is T, when T≤50℃, the temperature control valve 1 73 is fully opened, and the temperature control valve 2 74 is fully closed; when 50℃<T≤60℃, the temperature control valve 1 73 is closed by 1 / 5, and the temperature control valve 2 74 is opened by 1 / 5; when 60℃<T≤70℃, the temperature control valve 1 73 is closed by 2 / 5, and the temperature control valve 2 74 is opened by 2 / 5; when 70℃<T≤80℃, the temperature control valve 1 73 is closed by 3 / 5, and the temperature control valve 2 74 is opened by 3 / 5; when 80℃<T≤90℃, the temperature control valve 1 73 is closed by 4 / 5, and the temperature control valve 2 74 is opened by 4 / 5; when T≥95℃, the temperature control valve 1 73 is fully closed, and the temperature control valve 2 74 is fully opened.

[0028] The temperature in the inner tank 81 is ensured not to be overheated and the normal flow of the smoke channel 7 is not affected.

[0029] The specific implementation of the utility model is described in detail above, but it is only used as an example. The utility model is not limited to the specific implementation cases described above, and equivalent modifications to the utility model are also within the protection scope of the utility model.

Claims

1. A device for reusing flue gas from a para-ethylphenol alkali melting furnace to heat a sodium sulfonate tank, characterized in that: The invention comprises an alkali melting furnace (1), wherein an alkali melting kettle (2) is provided in the alkali melting furnace (1), a burner (3) is provided at the bottom of the alkali melting kettle (2) in the alkali melting furnace (1), the burner (3) is connected to an induced draft fan pipeline (4) and a natural gas pipeline (5), a heating chamber (6) is formed between the inner wall of the alkali melting furnace (1) and the outer wall of the alkali melting kettle (2), a flue gas channel (7) is opened on the furnace wall of the alkali melting furnace (1), and the flue gas channel (7) is branched into a flue gas branch channel 1 (71), a flue gas branch channel 2 (73), and a flue gas branch channel 3 (74). Second (72), the smoke branch channel one (71) is connected to a jacketed sodium sulfonate heat exchanger (8), the jacketed sodium sulfonate heat exchanger (8) comprises an inner tank body (81) and an outer tank body (82), the lower part of the outer tank body (82) is connected to the smoke branch channel one (71), the upper part of the outer tank body (82) is connected to a smoke outlet pipe (83), the smoke outlet pipe (83) is connected to a smoke spray device (9), and the smoke branch channel two (72) is connected to the smoke outlet pipe (83); The first smoke branch channel (71) is provided with a first temperature control valve (73), and the second smoke branch channel (72) is provided with a second temperature control valve (74); The bottom of the inner tank body (81) is connected to a sodium sulfonate dripping pipe (10), and the discharge port (11) of the sodium sulfonate dripping pipe (10) is placed in the alkali melting kettle (2); A temperature sensor (12) is provided in the inner tank body (81); the temperature sensor (12) is electrically connected to a signal input end of a controller (13); and a signal output end of the controller (13) is electrically connected to a first temperature control valve (73) and a second temperature control valve (74).

2. The device for reusing flue gas from an alkali-p-ethylphenol melting furnace to heat a sodium sulfonate tank according to claim 1, characterized in that: The induced draft fan pipeline (4) is connected to the induced draft fan (14).

3. The device for reusing flue gas from an alkali-p-ethylphenol melting furnace to heat a sodium sulfonate tank according to claim 1, characterized in that: The natural gas pipeline (5) is connected to a natural gas pressure regulating station (15).

4. The device for reusing flue gas from an alkali-p-ethylphenol melting furnace to heat a sodium sulfonate tank according to claim 1, characterized in that: The alkali melting kettle (2) is provided with a first motor stirrer (16), and the inner tank body (81) is provided with a second motor stirrer (17).

5. The device for reusing flue gas from an alkali-p-ethylphenol melting furnace to heat a sodium sulfonate tank according to claim 1, characterized in that: The bottom of the alkali melting kettle (2) is connected to a discharge pipe (18).

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