Modified pitch cooling system for byproduct high-pressure steam

Abstract

The utility model relates to the technical field of coal tar processing, in particular to a modified pitch cooling system for byproduct high-pressure steam. Boiler water is stored in the degasser, a water outlet pipe is arranged at the bottom of the degasser and connected with a circulating return pipe and a cooling water pipe, the cooling water pipe is connected with a shell inlet of the primary cooler, and a shell outlet of the primary cooler is connected with a high-pressure steam pipe network through a steam outlet pipe. A top tube pass inlet of the primary cooler is connected with the modified pitch inlet; a bottom tube pass outlet of the primary cooler is connected with the modified pitch outlet; a first pressure gauge is arranged on the degasser, the degasser is connected with a steam inlet pipe, a first steam adjusting valve is arranged on the steam inlet pipe, and the first pressure gauge is electrically connected with the first steam adjusting valve. According to the utility model, the use amount of cooling water is reduced, the heat recovery rate is increased, the byproduct high-pressure steam is obtained, and the problems of instability and easiness in blockage of the existing vaporization cooler are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal tar processing, in particular to a modified asphalt cooling system with by-product high-pressure steam. Background Art

[0002] At present, the specific process flow of the continuous heating polymerization and vacuum flash evaporation process in the heating furnace in the production of modified asphalt is as follows:

[0003] After the medium-temperature asphalt and hot asphalt are mixed in the asphalt mixer, they enter the asphalt heating furnace and are heated to 385°C before entering the reactor. The oil and gas escaping from the top of the reactor are sent to the flash oil buffer tank at 365°C and then flow to the flash oil tank by gravity; the asphalt at the bottom of the reactor is extracted by the asphalt circulation pump, most of which is mixed with the medium-temperature asphalt from the asphalt tower through the asphalt mixer, sent to the asphalt heating furnace for heating, and then returned to the reactor as the heat source of the reactor. The remaining asphalt is sent to the flash tank to adjust its softening point. The modified asphalt with the softening point adjusted at the bottom of the flash tank is pumped to the asphalt vaporization cooler by the modified asphalt pump to cool to 230°C and then flows into the modified asphalt tank by gravity. The vaporization cooler is a very important process equipment in this process system, and its operating stability directly affects the normal production of the system.

[0004] like Figure 1 As shown, the modified asphalt enters the vaporizer cooler for condensation cooling (temperature drops from 350-380℃ to 230-300℃), and most of the heat is indirectly taken away by cooling water in the vaporizer cooler. The vaporizer cooler consists of an upper heat exchanger and a lower heat exchanger. The modified asphalt to be cooled enters from the modified asphalt inlet 1, and the boiler water in the lower heat exchanger exchanges heat with the modified asphalt; the cooled modified asphalt is sent out from the modified asphalt outlet 2, and the boiler water after heat exchange becomes water vapor and enters the upper heat exchanger from the water vapor riser 3. The water vapor entering the upper heat exchanger exchanges heat with the cooling water and is condensed. The cooling water enters from the circulating water inlet 5, is discharged from the circulating water outlet 6, and flows from the condensed water lower liquid pipe 4 to the lower heat exchanger. The boiler water is recycled and replenished regularly. Feedback from field use shows that the evaporative cooler uses a relatively large amount of cooling water. In addition, the water supply to the lower heat exchanger is in a closed-loop circulation, and long-term circulation is prone to scaling and clogging of the equipment, resulting in poor cooler effect. It also consumes a large amount of cooling water, causing most of the heat to be wasted. Utility Model Content

[0005] The technical problem to be solved by the utility model is to propose a modified asphalt cooling system with by-product high-pressure steam, which reduces the use of cooling water, increases the heat recovery rate, obtains by-product high-pressure steam, and solves the problems of instability and easy clogging of existing vaporization coolers.

[0006] The modified asphalt cooling system with by-product high-pressure steam described in the utility model comprises a degasser and a primary cooler. Boiler water is stored in the degasser. A water outlet pipe is provided at the bottom of the degasser. The water outlet pipe is connected to a circulating reflux pipe and a cooling water pipe. The cooling water pipe is connected to the shell inlet of the primary cooler. The shell outlet of the primary cooler is connected to the high-pressure steam network through a steam outlet pipe. The top pipe inlet of the primary cooler is connected to the modified asphalt inlet, and the bottom pipe outlet of the primary cooler is connected to the modified asphalt outlet.

[0007] A pressure gauge 1 is provided on the degasser, the degasser is connected to a steam inlet pipe, a steam regulating valve 1 is provided on the steam inlet pipe, and the pressure gauge 1 is electrically connected to the steam regulating valve 1;

[0008] A pressure gauge 2 and a steam regulating valve 2 are provided on the steam outlet pipe, and the pressure gauge 2 and the steam regulating valve 2 are electrically connected.

[0009] Preferably, the deaerator is connected to a desalted water pipe, and a water replenishment regulating valve is provided on the desalted water pipe.

[0010] Preferably, a boiler water level gauge is provided on the deaerator.

[0011] Preferably, a water pump is provided on the water outlet pipe.

[0012] Preferably, the primary cooler shell is provided with a cooler level gauge, and the cooling water pipe is provided with a cooling water regulating valve.

[0013] Preferably, the degasser and the steam outlet pipe are both provided with safety valves.

[0014] Valves can be installed on the pipeline according to control needs, and the flow of materials in the corresponding pipeline can be conveniently controlled and adjusted by opening and closing the valves.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. Greatly reduce the amount of cooling water, realize the waste heat recovery, increase the heat recovery rate, and increase the amount of by-product steam;

[0017] 2. Solve the problem of boiler water closed-loop circulation in the existing vaporizing cooler, which is prone to scaling and clogging due to long-term circulation;

[0018] 3. The problem of unstable operation of existing vaporizing coolers in production, which affects normal production, is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a vaporizing cooler in the prior art;

[0020] Figure 2 It is a schematic diagram of the structure of the utility model;

[0021] In the figure: 1. Modified asphalt inlet; 2. Modified asphalt outlet; 3. Steam riser; 4. Condensate submerged liquid pipe; 5. Circulating water inlet; 6. Circulating water outlet; 7. Degasser; 8. Primary cooler; 9. Water outlet pipe; 10. Circulating reflux pipe; 11. Cooling water pipe; 12. Steam outlet pipe; 13. Pressure gauge 1; 14. Steam inlet pipe; 15. Steam regulating valve 1; 16. Pressure gauge 2; 17. Steam regulating valve 2; 18. Demineralized water pipe; 19. Make-up water regulating valve; 20. Boiler water level gauge; 21. Water pump; 22. Cooling water regulating valve; 23. Cooler level gauge. DETAILED DESCRIPTION

[0022] The present invention will be described clearly and completely below with reference to the accompanying drawings.

[0023] like Figure 2 As shown, the modified asphalt cooling system with by-product high-pressure steam described in the utility model comprises a degasser 7 and a primary cooler 8. Boiler water is stored in the degasser 7. A water outlet pipe 9 is provided at the bottom of the degasser 7. The water outlet pipe 9 is connected to a circulation reflux pipe 10 and a cooling water pipe 11. The cooling water pipe 11 is connected to the shell inlet of the primary cooler 8. The shell outlet of the primary cooler 8 is connected to the high-pressure steam network through a steam outlet pipe 12. The top pipe inlet of the primary cooler 8 is connected to the modified asphalt inlet 1, and the bottom pipe outlet of the primary cooler 8 is connected to the modified asphalt outlet 2.

[0024] A pressure gauge 13 is provided on the degasser 7, the degasser 7 is connected to a steam inlet pipe 14, a steam regulating valve 15 is provided on the steam inlet pipe 14, and the pressure gauge 13 and the steam regulating valve 15 are electrically connected;

[0025] A second pressure gauge 16 and a second steam regulating valve 17 are provided on the steam outlet pipe 12, and the second pressure gauge 16 and the second steam regulating valve 17 are electrically connected.

[0026] The deaerator 7 is connected to a desalted water pipe 18 , and a water replenishment regulating valve 19 is provided on the desalted water pipe 18 .

[0027] The deaerator 7 is provided with a boiler water level gauge 20 .

[0028] The water outlet pipe 9 is provided with a water pump 21 .

[0029] The shell of the primary cooler 8 is provided with a cooler level gauge 23 , and the cooling water pipe 11 is provided with a cooling water regulating valve 22 .

[0030] The degasser 7 and the steam outlet pipe 12 are both provided with safety valves.

[0031] The working process is as follows:

[0032] The boiler water in the degasser 7 enters the shell of the primary cooler 8 under the action of the water pump 21, where it exchanges heat with the modified asphalt from the bottom of the flash tank. The modified asphalt enters the tube side of the primary cooler 8 from the modified asphalt inlet 1, exchanges heat with the boiler water, and is cooled to 280-300°C, and flows into the modified asphalt storage tank from the modified asphalt outlet 2 by gravity;

[0033] The boiler water after heat exchange in the primary cooler 8 is partially vaporized, and the pressure gauge 16 on the steam outlet pipe 12 detects the steam pressure in the pipe. When the pressure reaches the set upper limit, the steam regulating valve 17 is interlocked and opened, and the steam enters the high-pressure steam network and is discharged regularly; when the pressure drops to the set lower limit, the steam regulating valve 17 is interlocked and closed, and the steam is not discharged. If it exceeds the set safety value, the pressure is released through the safety valve to ensure the safe operation of the system; the unvaporized boiler water in the primary cooler 8 is concentrated in the lower part of the shell layer, and the liquid level of the shell layer is detected by the cooler liquid level meter 23. The opening of the cooling water regulating valve 22 is controlled according to the liquid level to control the amount of boiler water in the shell layer of the primary cooler 8;

[0034] The deaerator 7 is replenished with desalted water through the desalted water pipe 18, and the boiler water level in the deaerator 7 is detected by the boiler water level meter 20. The opening of the water replenishment regulating valve 19 is controlled according to the boiler water level to control the amount of desalted water entering the boiler water level meter 20; the pressure in the deaerator 7 is controlled at 20-30kPa through the interlocking control of the steam regulating valve 15 and the pressure gauge 13 to ensure the low oxygen content of the boiler water.

Claims

1. A modified asphalt cooling system with by-product high-pressure steam, characterized in that: The deaerator (7) and the primary cooler (8) are provided. The deaerator (7) stores boiler water. A water outlet pipe (9) is provided at the bottom of the deaerator (7). The water outlet pipe (9) is connected to a circulating reflux pipe (10) and a cooling water pipe (11). The cooling water pipe (11) is connected to a shell inlet of the primary cooler (8). The shell outlet of the primary cooler (8) is connected to a high-pressure steam network through a steam outlet pipe (12). The top pipe inlet of the primary cooler (8) is connected to a modified asphalt inlet (1), and the bottom pipe outlet of the primary cooler (8) is connected to a modified asphalt outlet (2). A pressure gauge (13) is provided on the degasser (7), the degasser (7) is connected to a steam inlet pipe (14), a steam regulating valve (15) is provided on the steam inlet pipe (14), and the pressure gauge (13) and the steam regulating valve (15) are electrically connected; A second pressure gauge (16) and a second steam regulating valve (17) are provided on the steam outlet pipe (12), and the second pressure gauge (16) and the second steam regulating valve (17) are electrically connected.

2. The modified asphalt cooling system with by-product high-pressure steam according to claim 1, characterized in that: The degasser (7) is connected to a desalted water pipe (18), and a water supply regulating valve (19) is provided on the desalted water pipe (18).

3. The modified asphalt cooling system with by-product high-pressure steam according to claim 2, characterized in that: The deaerator (7) is provided with a boiler water level gauge (20).

4. The modified asphalt cooling system with by-product high-pressure steam according to claim 1, characterized in that: A water pump (21) is provided on the water outlet pipe (9).

5. The modified asphalt cooling system with by-product high-pressure steam according to claim 1, characterized in that: The shell of the primary cooler (8) is provided with a cooler liquid level gauge (23), and the cooling water pipe (11) is provided with a cooling water regulating valve (22).

6. The modified asphalt cooling system with by-product high-pressure steam according to claim 1, characterized in that: The degasser (7) and the steam outlet pipe (12) are both provided with safety valves.

Images