Heat exchange system of spiral plate heat exchanger of slurry bed device

Abstract

The utility model relates to the technical field of petrochemical engineering, in particular to a heat exchange system of a spiral-plate heat exchanger of a slurry bed device, which comprises a steam generation steam pocket, a circulating pump, a heat exchanger and a water supply pipeline, the water supply pipeline is communicated with the steam generation steam pocket, and an inlet of the circulating pump is communicated with the steam generation steam pocket through a pump water inlet pipeline. An outlet of the circulating pump communicates with the heat exchanger through a heat exchange water side inlet pipeline, the heat exchanger communicates with the steam generation steam pocket through a heat exchange water side outlet pipeline, and the heat exchanger is connected with a heat exchange oil inlet pipeline and a heat exchange oil return pipeline. The forced circulation of deoxygenated water at the water side inlet of the heat exchanger is realized through the circulating pump, the hot water circulation volume of the heat exchanger can be stably controlled, the water side flow rate and the circulation ratio are ensured, the heating surface of the heat exchanger is protected, the internal stress damage of the heat exchanger can be obviously reduced, the heat transfer effect is enhanced, and the risks of scaling and blocking are reduced; therefore, the operation efficiency and stability of the heat exchanger are improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a spiral plate heat exchanger heat exchange system for a slurry bed device. Background Technology

[0002] Slurry-bed residue hydrocracking is an important process for treating heavy oil, converting it into lighter, higher-quality oil products. It features strong feedstock adaptability, high conversion rate, high light oil yield, simple process, flexible operation, and a simple reactor structure. Slurry-bed residue hydrocracking technology has almost no limitations on feedstock properties, achieving liquid product yields of over 90%. The slurry-bed reactor uses both nano-particle and oil-soluble catalysts, both dispersed and suspended in the reactor, undergoing hydropyrolysis of the residue under high temperature and pressure. In this process, the spiral plate heat exchanger is a crucial piece of equipment in the slurry-bed residue hydrocracking unit. Due to the high temperature, high pressure, and corrosive media during operation, leaks are prone to occur. The proper functioning of the spiral plate heat exchanger is critical to the efficiency and stability of the entire process. Spiral plate heat exchangers are used for heat exchange and generate a large amount of steam. Their water-side circulation usually relies on natural circulation. However, the traditional natural circulation method cannot achieve a stable heat exchange effect over a long period under normal operating conditions. Internal leakage usually occurs after about a few months of operation. Natural circulation causes insufficient water flow velocity during water-side siphoning of the heat exchanger, resulting in steam resistance during the heat exchange process. Due to long-term steam resistance, fluctuations in operating conditions, and other reasons, internal leakage problems occur in spiral plate heat exchangers. This not only reduces the heat exchange efficiency of the heat exchanger but may also lead to safety hazards, increase the frequency of inspection and leak plugging, and increase maintenance costs.

[0003] Therefore, it is necessary to propose a spiral plate heat exchanger system for slurry bed devices to overcome the shortcomings of existing technologies. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the prior art and provide a spiral plate heat exchanger system for a slurry bed device.

[0005] The technical solution of this utility model is:

[0006] A spiral plate heat exchanger heat exchange system for a slurry bed device includes a steam generator drum, a circulating pump, a heat exchanger, and a feedwater pipeline. The feedwater pipeline is connected to the steam generator drum. The inlet of the circulating pump is connected to the steam generator drum via a pump inlet pipeline. The outlet of the circulating pump is connected to the heat exchanger via a hot water inlet pipeline. The heat exchanger is connected to the steam generator drum via a hot water outlet pipeline. A heat exchange oil inlet pipeline and a heat exchange oil return pipeline are connected to the heat exchanger.

[0007] Preferably, a pump outlet flow meter and a pump outlet pressure sensor are sequentially installed on the inlet pipeline of the hot water exchange side.

[0008] Preferably, a heat exchange outlet flow meter, a heat exchange outlet temperature sensor, and a heat exchange outlet regulating valve are sequentially installed on the hot water outlet pipeline.

[0009] Preferably, a pump outlet pressure gauge is also installed on the inlet pipeline of the hot water exchanger side, and a heat exchange outlet thermometer is also installed on the outlet pipeline of the hot water exchanger side.

[0010] Preferably, the steam generator drum is equipped with a steam discharge pipeline, and a pressure control regulating valve is installed on the steam discharge pipeline.

[0011] Preferably, the steam generator drum is equipped with a steam level sensor, a steam pressure sensor, and a level gauge.

[0012] Preferably, the system also includes a control system, and the circulating pump, pump outlet flow meter, pump outlet pressure sensor, heat exchange outlet flow meter, heat exchange outlet temperature sensor, steam level sensor, and steam pressure sensor are all electrically connected to the control system.

[0013] Preferably, a water supply regulating valve is installed on the water supply pipeline.

[0014] Preferably, the heat exchanger is a spiral plate heat exchanger.

[0015] Preferably, two sets of circulating pumps and heat exchangers are provided, with the circulating pumps and heat exchangers being divided into two groups, and the two groups of circulating pumps and heat exchangers being connected in parallel to the steam generator drum.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Improve heat exchange efficiency: The forced circulation by the circulating pump increases the flow rate on the water side of the heat exchanger, strengthens the heat transfer process, and enables the heat exchanger to transfer heat more effectively, thereby improving the energy utilization efficiency of the entire process.

[0018] 2. Enhanced stability: Controlling the stable water flow rate of the circulating pump helps reduce the temperature changes of the heat exchanger caused by flow fluctuations, reduces the thermal stress of the equipment, and enhances the operational stability of the heat exchanger.

[0019] 3. Reduced scaling and clogging: Higher flow rates can reduce the deposition of dirt on the inner surface of the heat exchanger, reduce the likelihood of clogging, and reduce the frequency of equipment maintenance and cleaning;

[0020] 4. Flexible adjustment: By controlling the flow meter and various sensors through the control system, the speed and flow rate of the circulating pump can be flexibly adjusted according to process requirements to adapt to different working conditions;

[0021] 5. Extended service life: It can stably control the hot water circulation volume of the heat exchanger, ensure the water flow rate and circulation ratio, protect the heat-receiving surface of the heat exchanger, and extend the service life of the heat exchanger. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the control system connection of this utility model.

[0024] The components include: 1. Steam generator drum; 2. Circulating pump; 3. Heat exchanger; 4. Feed water pipeline; 5. Pump inlet pipeline; 6. Hot water inlet pipeline on the hot water exchanger side; 7. Hot water outlet pipeline on the hot water exchanger side; 8. Heat exchanger oil inlet pipeline; 9. Heat exchanger oil return pipeline; 10. Pump outlet flow meter; 11. Pump outlet pressure sensor; 12. Pump outlet pressure gauge; 13. Heat exchanger outlet flow meter; 14. Heat exchanger outlet temperature sensor; 15. Heat exchanger outlet regulating valve; 16. Heat exchanger outlet thermometer; 17. Steam discharge pipeline; 18. Pressure control regulating valve; 19. Steam level sensor; 20. Steam pressure sensor; 21. Level gauge; 22. Control system; 23. Make-up water regulating valve. Detailed Implementation

[0025] To make the technical means, technical features, utility model purpose and technical effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.

[0026] like Figure 1 and Figure 2 As shown, a spiral plate heat exchanger system for a slurry bed device includes a steam drum 1, a circulating pump 2, a heat exchanger 3, a feed water pipeline 4, a pump inlet pipeline 5, a heat exchanger hot water side inlet pipeline 6, a heat exchanger hot water side outlet pipeline 7, a heat exchanger oil inlet pipeline 8, and a heat exchanger oil return pipeline 9. The feed water pipeline 4 is connected to the steam drum 1 and is used to supply deoxygenated water to the steam drum 1. The inlet of the circulating pump 2 is connected to the steam drum 1 through the pump inlet pipeline 5, and the outlet of the circulating pump 2 is connected through the heat exchanger hot water side inlet pipeline 9. Line 6 is connected to heat exchanger 3. The circulating pump 2 has the characteristics of high pressure resistance, high temperature resistance, and stable operation, and can adapt well to the harsh working environment of the slurry bed residue oil hydrogenation unit. It is connected between heat exchanger 3 and steam generator drum 1 through hot water outlet pipeline 7. Heat exchanger 3 adopts spiral plate heat exchanger 3, which has a compact structure, good heat transfer efficiency, high operating stability, and self-cleaning effect, and is not easy to scale. Heat exchange oil inlet pipeline 8 and heat exchange oil return pipeline 9 are connected to heat exchanger 3 to realize the circulation of heat transfer oil.

[0027] There are two circulating pumps 2 and two heat exchangers 3. The two circulating pumps 2 and two heat exchangers 3 are divided into two groups, each group consisting of one circulating pump 2 and one heat exchanger 3 connected in series. The two groups of circulating pumps 2 and heat exchangers 3 are connected in parallel to the steam generator drum 1, serving as redundant backups for each other. They can work simultaneously or independently. If one group of circulating pumps 2 and heat exchangers 3 fails and stops, the other can still ensure the normal operation of the system.

[0028] like Figure 1 As shown, deoxygenated water is introduced into the steam generator drum 1 through the water supply pipeline 4. A water supply regulating valve 23 is installed on the water supply pipeline 4. By opening the water supply regulating valve 23, deoxygenated water is introduced into the steam generator drum 1, and the pressure and flow rate of the deoxygenated water input can be regulated.

[0029] like Figure 1 As shown, the pump inlet pipeline 5 is connected between the steam generator drum 1 and the inlet of the circulating pump 2. The circulating pump 2 extracts deoxygenated water from the steam generator drum 1 through the pump inlet pipeline 5, pressurizes it, and then delivers it to the heat exchanger 3 through the heat exchanger side inlet pipeline 6. The heat exchanger side inlet pipeline 6 is equipped with a pump outlet flow meter 10, a pump outlet pressure sensor 11, and a pump outlet pressure gauge 12 in sequence. The pump outlet flow meter 10 is used to monitor the outlet flow of the circulating pump 2, the pump outlet pressure sensor 11 is used to realize the remote control of the outlet pressure of the circulating pump 2, and the pump outlet pressure gauge 12 is used to realize the on-site observation of the outlet pressure of the circulating pump 2. By monitoring the flow and pressure of the circulating pump 2, the speed of the circulating pump 2 can be adjusted in real time.

[0030] like Figure 1 As shown, the pressurized deoxygenated water enters the heat exchanger 3 through the inlet pipeline 6 on the hot water side. Inside the heat exchanger 3, it exchanges heat with the high-temperature heat transfer oil and is heated. The high-temperature heat transfer oil circulates through the heat exchange oil inlet pipeline 8 and the heat exchange oil return pipeline 9. The heated deoxygenated water flows back to the steam generator drum 1 through the outlet pipeline 7 on the hot water side. A heat exchange outlet flow meter 13, a heat exchange outlet temperature sensor 14, a heat exchange outlet regulating valve 15, and a heat exchange outlet thermometer 16 are installed sequentially on the outlet pipeline 7 on the hot water side. The heat exchange outlet flow meter 13 and the heat exchange outlet temperature sensor 14 are used to remotely monitor the water temperature and flow rate at the outlet of the heat exchanger 3 in real time to evaluate the heat exchange effect. The flow meter 13 and the heat exchange outlet temperature sensor 14 are used to regulate the flow rate and temperature at the outlet of the heat exchanger 3. The heat exchange outlet regulating valve 15 is used to regulate the flow rate and temperature. The heat exchange outlet thermometer 16 is used to facilitate on-site monitoring of the outlet temperature of the heat exchanger 3.

[0031] like Figure 1As shown, high-temperature and high-pressure deoxygenated water and steam enter the steam generator drum 1 together. Gas-liquid separation occurs inside the steam generator drum 1, and steam at a certain pressure is flashed out. A steam discharge pipeline 17 is connected to the top of the steam generator drum 1, and a pressure control regulating valve 18 is installed on the steam discharge pipeline 17. The flashed steam is discharged externally through the steam discharge pipeline 17 and the pressure control regulating valve 18. A steam level sensor 19, a steam pressure sensor 20, and a level gauge 21 are also installed on the steam generator drum 1. The steam level sensor 19 and the steam pressure sensor 20 enable remote monitoring and control of the liquid level and pressure inside the steam generator drum 1, and the level gauge 21 facilitates on-site observation of the liquid level inside the steam generator drum 1.

[0032] like Figure 1 and Figure 2 As shown, a heat exchange system for a spiral plate heat exchanger 3 in a slurry bed device also includes a control system 22. The circulating pump 2, pump outlet flow meter 10, pump outlet pressure sensor 11, heat exchange outlet flow meter 13, heat exchange outlet temperature sensor 14, steam level sensor 19, and steam pressure sensor 20 are all electrically connected to the control system 22. The control system 22 realizes remote control of speed, flow rate, pressure, temperature, and liquid level to achieve precise control and operation monitoring of the circulating pump 2, and to adjust the heat exchange effect and operating parameters of the heat exchanger 3 to ensure that the expected forced circulation effect is achieved.

[0033] The working principle of this utility model is as follows:

[0034] In use, open the water supply regulating valve 23 to input deoxygenated water into the steam generator drum 1 through the water supply pipeline 4, start the circulation pump 2 to achieve forced circulation and pressurization of the deoxygenated water, and the pressurized deoxygenated water enters the heat exchanger 3. After heat exchange with the high-temperature heat transfer oil flowing through the heat exchanger 3, the high-temperature and high-pressure deoxygenated water and steam return to the steam generator drum 1 together, where gas-liquid separation takes place. The steam generated by flash evaporation is transported out through the steam discharge pipeline 17 at the top of the steam generator drum 1. The unvaporized deoxygenated water and the newly added deoxygenated water are separated. The water continues to be pressurized by the circulating pump 2 and enters the water side of the heat exchanger 3, thus completing the working process cycle. During the process cycle, the operation of the circulating pump 2 is monitored and adjusted in real time by the control system 22. By setting the flow rate and pressure of the circulating pump 2, the heat exchange requirements of the heat exchanger 3 under different operating conditions are met, ensuring stable circulation on the water side of the heat exchanger 3. The temperature of the outlet pipeline of the heat exchanger 3 is monitored in real time to evaluate the heat exchange effect. Based on the heat exchange effect and the demand for flash steam, the operating parameters of the circulating pump 2 are adjusted to optimize the heat exchange efficiency and achieve closed-loop control.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made in accordance with the scope of the claims of this utility model should fall within the technical scope of this utility model.

Claims

1. A slurry bed unit screw plate heat exchanger heat exchange system characterized by: It includes steam generation drum (1), circulating pump (2), heat exchanger (3) and feed water pipeline (4), the feed water pipeline (4) is communicated with the steam generation drum (1), the inlet of the circulating pump (2) is communicated with steam generation drum (1) by pump water inlet pipeline (5), the outlet of circulating pump (2) is communicated with heat exchanger (3) by heat exchange water side inlet pipeline (6), heat exchanger (3) and steam generation drum (1) are communicated by heat exchange water side outlet pipeline (7), heat exchanger (3) is connected with heat exchange inlet oil pipeline (8) and heat exchange return oil pipeline (9).

2. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 1, wherein: The pump outlet flow meter (10) and pump outlet pressure sensor (11) are sequentially arranged on the heat exchange water side inlet pipeline (6).

3. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 2, wherein: The heat exchange outlet flow meter (13), heat exchange outlet temperature sensor (14) and heat exchange outlet regulating valve (15) are sequentially arranged on the heat exchange water side outlet pipeline (7).

4. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 3, wherein: The pump outlet pressure gauge (12) is further arranged on the heat exchange water side inlet pipeline (6), and the heat exchange outlet thermometer (16) is further arranged on the heat exchange water side outlet pipeline (7).

5. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 4, wherein: The steam discharge pipeline (17) is arranged on the steam generation drum (1), and the pressure control regulating valve (18) is arranged on the steam discharge pipeline (17).

6. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 5, wherein: The steam level sensor (19), steam pressure sensor (20) and liquid level meter (21) are arranged on the steam generation drum (1).

7. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 6, wherein: The control system (22) is further included, and the circulating pump (2), pump outlet flow meter (10), pump outlet pressure sensor (11), heat exchange outlet flow meter (13), heat exchange outlet temperature sensor (14), steam level sensor (19) and steam pressure sensor (20) are electrically connected with the control system (22).

8. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 1, wherein: The feed water pipeline (4) is provided with a water supply regulating valve (23).

9. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 1, wherein: The circulating pump (2) and heat exchanger (3) are both provided as two sets, and the circulating pump (2) and heat exchanger (3) are divided into two groups in one-to-one correspondence, and the circulating pump (2) and heat exchanger (3) of the two groups are connected in parallel on the steam generation drum (1).

10. The slurry bed unit spiral sheet heat exchanger heat exchange system of claim 1, wherein: The heat exchanger (3) adopts a spiral plate heat exchanger.

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