CN114440698A - Method for reducing burning-through of furnace door of tubular furnace by degreasing and alkali washing heat exchanger - Google Patents
Method for reducing burning-through of furnace door of tubular furnace by degreasing and alkali washing heat exchanger Download PDFInfo
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- CN114440698A CN114440698A CN202011220895.1A CN202011220895A CN114440698A CN 114440698 A CN114440698 A CN 114440698A CN 202011220895 A CN202011220895 A CN 202011220895A CN 114440698 A CN114440698 A CN 114440698A
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- Prior art keywords
- heat exchanger
- waste liquid
- rich
- rich oil
- alkali washing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/18—Door frames; Doors, lids, removable covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D2021/0057—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects
Abstract
The invention discloses a method for reducing burning-through of a tubular furnace door of a degreasing alkali washing heat exchanger, which relates to the field of oil-rich heat exchangers and adopts the technical scheme that the key points of the method are as follows: the inside water washing that carries out through circulation system of rich oil heat exchanger, the water washing time is 30~60min, circulation system includes the water pump, the water pump is connected with switch board and tetrafluoro groove, the tetrafluoro groove is connected with infusion hose and waste liquid hose, be equipped with first stop valve and second stop valve on infusion hose and the waste liquid hose respectively, infusion hose and waste liquid hose all communicate to rich oil heat exchanger inside, make the spiral plate of rich oil heat exchanger oil side and water side corrode and reduce, ensure that the heat exchanger normally works, and the furnace gate is difficult to be burnt through, extension heat exchanger life.
Description
Technical Field
The invention relates to the field of oil-rich heat exchangers, in particular to a method for reducing burning-through of a tubular furnace through a furnace door by a degreasing alkali washing heat exchanger.
Background
In the rich oil debenzolization process, as shown in fig. 4, as in the prior art, rich oil enters a rich oil tank, oil in the rich oil tank enters an oil-gas heat exchanger through a rich oil pump along a pipeline, the temperature is raised to 75 ℃ and enters a lean-rich oil heat exchanger, when the lean-rich oil heat exchanger exchanges heat to 155 ℃, the rich oil enters a tubular furnace along the pipeline for heating, and the temperature of the rich oil is raised to 185 ℃ and then enters a debenzolization tower.
However, in the prior art, when the rich oil heat exchanger is used for a period of time, the rich oil scale is connected, so that the spiral plates on the oil side and the water side inside the rich oil heat exchanger are corroded to form inner leakage, the heat exchange effect is poor after the material is mixed, the temperature of the pipeline along the line from the rich oil heat exchanger to the tubular furnace is increased, the temperature of the pipeline in the tubular furnace is increased, the temperature of the convection section is always high at about 325-.
Disclosure of Invention
The invention aims to provide a method for reducing the burning-through of a tubular furnace door of a degreasing alkali-washing heat exchanger, which reduces the corrosion of spiral plates on the oil side and the water side of an oil-rich heat exchanger, ensures the normal work of the heat exchanger, ensures that the tubular furnace door is not easy to burn-through and prolongs the service life of the heat exchanger.
The technical purpose of the invention is realized by the following technical scheme: a method for reducing burning-through of a furnace door of a tube furnace by a degreasing alkali washing heat exchanger comprises the following steps: (1) the interior of the oil-rich heat exchanger is washed by water through a circulating system, and the water washing time is 30-60 min;
(2) NaOH degreasing alkali liquor is added into the interior of the rich oil heat exchanger through a circulating system, and primary alkali washing is carried out, wherein the primary alkali washing time is 120 min;
(3) adding an aqueous solution into the rich oil heat exchanger through a circulating system for washing, and simultaneously displacing the washed waste liquid out of the rich oil heat exchanger, wherein the water washing time is 60-90 min;
(4) adding a mixed solution containing NaOH degreasing alkali, sodium silicate and trisodium phosphate into the oil-rich heat exchanger through a circulating system, and performing secondary alkali washing for 6 hours;
(5) closing all valves, and soaking for 16 h;
(6) introducing water into the soaked rich oil heat exchanger, and simultaneously replacing the washed waste liquid out of the rich oil heat exchanger, wherein the water washing time is 2 hours;
(7) and standing the rich oil heat exchanger for 2-3 hours, and recovering normal use.
By adopting the technical scheme, through secondary water washing and secondary alkali washing, the rich oil accumulated scale in the heat exchanger is washed by alkali, the rich oil accumulated scale concentrated on a certain point is reduced, the corrosion of spiral plates on the oil side and the water side of the rich oil heat exchanger is reduced, the normal work of the heat exchanger is ensured, the furnace door is not easy to burn through, and the service life of the heat exchanger is prolonged.
Preferably, the circulating system comprises a draining pump, the draining pump is connected with a power distribution cabinet and a tetrafluoro tank, the tetrafluoro tank is connected with an infusion hose and a waste liquid hose, the infusion hose and the waste liquid hose are respectively provided with a first stop valve and a second stop valve, and the infusion hose and the waste liquid hose are communicated into the interior of the rich oil heat exchanger.
Through adopting above-mentioned technical scheme, the normal work of water pump is guaranteed to the switch board, and infusion hose and waste liquid hose all let in water and build Ye in to rich oil heat exchanger through the tetrafluoro groove, satisfy the operating requirement.
Preferably, the ratio of the NaOH degreasing alkali, the sodium silicate and the trisodium phosphate in the step (4) is 2: 1: 1.
by adopting the technical scheme, the alkali washing effect of the rich oil heat exchanger is ensured.
Preferably, the step (3) and the step (6) both replace the flushed waste liquid out of the rich oil heat exchanger through a waste liquid hose.
Through adopting above-mentioned technical scheme, satisfy the requirement of waste liquid discharge rich oil heat exchanger.
Preferably, the second stop valve is a three-way valve, the three-way valve is connected with a liquid discharge pipe, one end of the liquid discharge pipe is provided with a waste liquid tank through a water suction pump, the waste liquid tank is arranged on the ground through a support frame, the upper end and the lower end of the waste liquid tank are respectively provided with a purification port and a waste liquid outlet, and the lower end of the waste liquid tank is provided with a sealing part for sealing or opening the waste liquid outlet.
Through adopting above-mentioned technical scheme, concentrate the waste liquid and collect in the waste liquid case, add the scavenging solution to the waste liquid mouth through purifying the mouth, the environmental protection.
Preferably, the closing member includes a closing plate, the waste liquid tank lower extreme is equipped with the sliding tray that is located waste liquid outlet both sides, the closing plate both sides are through the equal sliding connection of sliding block in two sliding trays.
Through adopting above-mentioned technical scheme, the waste liquid is through purifying the back, and the operator removes the closing plate, simple structure, convenient operation.
Preferably, the lower end of the closing plate is provided with a pull ring.
By adopting the technical scheme, an operator can conveniently pull the closing plate.
Preferably, a circulating pipe which is introduced into the interior of the rich oil heat exchanger is arranged in the waste liquid tank, and a centrifugal water pump is arranged on the circulating pipe.
By adopting the technical scheme, the purified waste liquid can flow into the rich oil heat exchanger along the circulating pipe through the centrifugal water pump, so that water resources are saved, and the environment is protected.
In conclusion, the invention achieves the following beneficial effects: firstly, through secondary water washing and secondary alkali washing, the scale deposit of rich oil concentrated on a certain point is reduced, the corrosion of spiral plates on the oil side and the water side of the rich oil heat exchanger is reduced, the normal work of the heat exchanger is ensured, the furnace door is not easy to burn through, and the service life of the heat exchanger is prolonged.
Secondly, the purified waste liquid can flow into the rich oil heat exchanger along a circulating pipe through a centrifugal water pump, so that water resources are saved, and the environment is protected.
Drawings
Fig. 1 is a schematic view of the overall structure of the present embodiment 1 and the present embodiment 2;
FIG. 2 is a schematic structural view of the closing plate of the present embodiment 1;
FIG. 3 is a schematic structural view of the sliding groove of the embodiment 1
Fig. 4 is a schematic diagram of a prior art structure for embodying the background art of the present invention.
In the figure: 1. draining pump; 2. a power distribution cabinet; 3. a tetrafluoro tank; 4. a flexible infusion tube; 5. a waste liquid hose; 6. a first shut-off valve; 7. a second stop valve; 8. a liquid discharge pipe; 9. a waste liquid tank; 10. a purification port; 11. a waste liquid outlet; 12. a closing plate; 13. a sliding groove; 14. a pull ring; 15. a circulation pipe; 16. a centrifugal water pump; 17. a rich oil heat exchanger; 18. a tube furnace; 19. an oil rich tank; 20. an oil-rich pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
A method for reducing burning-through of a furnace door of a tube furnace by a degreasing alkali washing heat exchanger comprises the following steps: (1) the interior of the oil-rich heat exchanger 17 is washed by water through a circulating system, and the water washing time is 30-60 min;
(2) NaOH degreasing alkali liquor is added into the oil-rich heat exchanger 17 through a circulating system, and primary alkali washing is carried out, wherein the primary alkali washing time is 120 min;
(3) adding an aqueous solution into the rich oil heat exchanger 17 through a circulating system for washing, and simultaneously displacing the washed waste liquid out of the rich oil heat exchanger 17, wherein the water washing time is 60-90 min;
(4) adding a mixed solution containing NaOH degreasing alkali, sodium silicate and trisodium phosphate into the oil-rich heat exchanger 17 through a circulating system, and carrying out secondary alkali washing for 6 hours;
(5) closing all valves, and soaking for 16 h;
(6) after soaking, introducing water into the rich oil heat exchanger 17, and simultaneously replacing the washed waste liquid out of the rich oil heat exchanger 17, wherein the water washing time is 2 hours;
(7) and (3) standing the oil-rich heat exchanger 17 for 2-3 hours, and recovering normal use, wherein the proportion of NaOH degreasing alkali, sodium silicate and trisodium phosphate in the step (4) is 2: 1: 1, after secondary water washing and secondary alkali washing, alkali washing is carried out on rich oil scale inside the heat exchanger, so that the rich oil scale concentrated on a certain point is reduced, the corrosion of spiral plates on the oil side and the water side of the rich oil heat exchanger 17 is reduced, the normal work of the heat exchanger is ensured, a furnace door is not easy to burn through, and the service life of the heat exchanger is prolonged.
As shown in fig. 1, the circulating system includes a drain pump 1, the drain pump 1 is connected with a power distribution cabinet 2 and a tetrafluoro tank 3, the tetrafluoro tank 3 is externally connected with a water source, the tetrafluoro tank 3 is connected with an infusion hose 4 and a waste liquid hose 5, the infusion hose 4 and the waste liquid hose 5 are respectively provided with a first stop valve 6 and a second stop valve 7, the infusion hose 4 and the waste liquid hose 5 are communicated to the inside of an oil-rich heat exchanger 17, the flushed waste liquid in step (3) and step (6) is replaced out of the oil-rich heat exchanger 17 through the waste liquid hose 5, and the oil-rich heat exchanger 17 is a degreasing alkali-washing heat exchanger.
As shown in fig. 1-3, in order to collect the waste liquid in a centralized manner, the second stop valve 7 is a three-way valve, the three-way valve is connected with a liquid discharge pipe 8, one end of the liquid discharge pipe 8 is provided with a waste liquid tank 9 through a water pump, the waste liquid tank 9 is arranged on the ground through a support frame, the upper end and the lower end of the waste liquid tank 9 are respectively provided with a purification port 10 and a waste liquid outlet 11, the lower end of the waste liquid tank 9 is provided with a sealing part for sealing or opening the waste liquid outlet 11, the sealing part comprises a sealing plate 12, the lower end of the waste liquid tank 9 is provided with sliding grooves 13 positioned at two sides of the waste liquid outlet 11, two sides of the sealing plate 12 are connected in the two sliding grooves 13 in a sliding mode through sliding blocks, the lower end of the sealing plate 12 is provided with a pull ring 14 for collecting the waste liquid in the waste liquid tank 9 in a centralized manner, and purifying liquid is added to the waste liquid port through the purification port 10 for protecting the environment.
As shown in fig. 1, a circulating pipe 15 leading into the interior of the rich oil heat exchanger 17 is arranged in the waste liquid tank 9, a centrifugal water pump 16 is arranged on the circulating pipe 15, and the purified waste liquid can flow into the rich oil heat exchanger 17 along the circulating pipe 15 through the centrifugal water pump 16, so that water resources are saved, and the environment is protected.
Example 2
A method for reducing burning-through of a furnace door of a tube furnace by a degreasing alkali washing heat exchanger comprises the following steps: (1) the interior of the rich oil heat exchanger 17 is washed by water through a circulating system, and the water washing time is 60 min;
(2) 25kg of NaOH degreasing alkaline liquor is added into the oil-rich heat exchanger 17 through a circulating system, and first alkaline washing is carried out, wherein the first alkaline washing time is 120 min;
(3) adding water solution into the rich oil heat exchanger 17 through a circulating system for washing, and simultaneously displacing the washed waste liquid out of the rich oil heat exchanger 17, wherein the water washing time is 60 min;
(4) adding a mixed solution containing 50kg of NaOH degreasing alkali, 25kg of sodium silicate and 25kg of trisodium phosphate into the oil-rich heat exchanger 17 through a circulating system, and carrying out secondary alkali washing for 6 hours;
(5) closing all valves, and soaking for 16 h;
(6) water is introduced into the soaked rich oil heat exchanger 17, meanwhile, the washed waste liquid is replaced out of the rich oil heat exchanger 17, and the water washing time is 2 hours;
(7) the rich oil heat exchanger 17 is kept still for 3 hours and is recovered to be normally used, and rich oil scale inside the heat exchanger is washed with alkali through secondary water washing and secondary alkali washing, so that the rich oil scale concentrated on a certain point is reduced, the corrosion of spiral plates on the oil side and the water side of the rich oil heat exchanger 17 is reduced, the normal work of the rich oil heat exchanger 17 is ensured, a furnace door is not easily burnt through, and the service life of the rich oil heat exchanger 17 is prolonged.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A method for reducing burning-through of a furnace door of a tube furnace by a degreasing alkali washing heat exchanger is characterized by comprising the following steps: (1) the interior of the oil-rich heat exchanger is washed by water through a circulating system, and the water washing time is 30-60 min;
(2) NaOH degreasing alkali liquor is added into the interior of the rich oil heat exchanger through a circulating system, and primary alkali washing is carried out, wherein the primary alkali washing time is 120 min;
(3) adding an aqueous solution into the rich oil heat exchanger through a circulating system for washing, and simultaneously displacing the washed waste liquid out of the rich oil heat exchanger, wherein the water washing time is 60-90 min;
(4) adding a mixed solution containing NaOH degreasing alkali, sodium silicate and trisodium phosphate into the rich oil heat exchanger through a circulating system, and performing secondary alkali washing for 6 hours;
(5) closing all valves, and soaking for 16 h;
(6) water is introduced into the interior of the soaked rich oil heat exchanger, meanwhile, the washed waste liquid is replaced out of the rich oil heat exchanger, and the water washing time is 2 hours;
(7) and standing the rich oil heat exchanger for 2-3 hours, and recovering normal use.
2. The method for reducing the burning-through of the tubular furnace door of the degreasing alkali washing heat exchanger as recited in claim 1, wherein the method comprises the following steps: the circulating system comprises a draining pump (1), wherein the draining pump (1) is connected with a power distribution cabinet (2) and a tetrafluoro tank (3), the tetrafluoro tank (3) is connected with an infusion hose (4) and a waste liquid hose (5), the infusion hose (4) and the waste liquid hose (5) are respectively provided with a first stop valve (6) and a second stop valve (7), and the infusion hose (4) and the waste liquid hose (5) are communicated into the interior of the rich oil heat exchanger (17).
3. The method for reducing the burning through of the furnace door of the tube furnace by the degreasing alkali washing heat exchanger as claimed in claim 1, wherein the method comprises the following steps: the mixture ratio of NaOH degreasing alkali, sodium silicate and trisodium phosphate in the step (4) is 2: 1: 1.
4. the method for reducing the burning-through of the tubular furnace door of the degreasing alkali washing heat exchanger as recited in claim 1, wherein the method comprises the following steps: and (3) and (6) replacing the flushed waste liquid out of the oil-rich heat exchanger (17) through a waste liquid hose (5).
5. The method for reducing the burning through of the furnace door of the tube furnace by the degreasing alkali washing heat exchanger as claimed in claim 2, wherein the method comprises the following steps: second stop valve (7) are the three-way valve, the three-way valve is connected with fluid-discharge tube (8), fluid-discharge tube (8) one end is equipped with waste liquid case (9) through the suction pump, waste liquid case (9) set up subaerial through the support frame, waste liquid case (9) upper and lower end is equipped with purification mouth (10) and waste liquid export (11) respectively, waste liquid case (9) lower extreme is equipped with the closure that seals waste liquid export (11) or open.
6. The method for reducing the burning through of the furnace door of the tube furnace by the degreasing alkali washing heat exchanger as recited in claim 5, wherein: the closing member includes closing plate (12), waste liquid case (9) lower extreme is equipped with sliding tray (13) that are located waste liquid export (11) both sides, closing plate (12) both sides are through the equal sliding connection of sliding block in two sliding tray (13).
7. The method for reducing the burning through of the furnace door of the tube furnace by the degreasing alkali washing heat exchanger as recited in claim 6, wherein: the lower end of the closing plate (12) is provided with a pull ring (14).
8. The method for reducing the burning through of the furnace door of the tube furnace by the degreasing alkali washing heat exchanger as recited in claim 6, wherein: and a circulating pipe (15) which is introduced into the interior of the rich oil heat exchanger (17) is arranged in the waste liquid tank (9), and a centrifugal water pump (16) is arranged on the circulating pipe (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011220895.1A CN114440698A (en) | 2020-11-05 | 2020-11-05 | Method for reducing burning-through of furnace door of tubular furnace by degreasing and alkali washing heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011220895.1A CN114440698A (en) | 2020-11-05 | 2020-11-05 | Method for reducing burning-through of furnace door of tubular furnace by degreasing and alkali washing heat exchanger |
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|---|---|---|---|---|
| JPH037893A (en) * | 1989-06-06 | 1991-01-16 | Nkk Corp | Cleaning method of oil heat exchanger in recovery process of coarse light oil in coke oven gas |
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2020
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