Waste heat recovery system of hydrogenation device

Abstract

The utility model discloses a waste heat recovery system of a hydrogenation device, which comprises a first heat exchanger for replacing a 100N base oil air cooler, a second heat exchanger for replacing a 150N base oil air cooler, a third heat exchanger for replacing a 500N base oil air cooler and a fourth heat exchanger arranged behind a heating furnace smoke window, an inlet of the cold water pump is connected with a primary water tank, and a water inlet of the primary water tank is connected with a water outlet of the water cooler through a cold water feeding pipe. Hot water outlets of the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger and the original heat exchanger of the hydrogen production device unit are connected with a hot water tank and a refrigerating unit through two pipelines. The device is simple and practical, not only can realize heat exchange between base oil and flue gas exhausted by the heating furnace, but also can use hot water after heat exchange for heating, selling, vacuum systems and the like, and is high in energy utilization efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery system for a hydrogenation device. Background Art

[0002] Hydrogen is the key development direction of clean energy in the future. As hydrogenation technology becomes more mature and perfect, the capacity of hydrogenation is also gradually increasing.

[0003] Existing hydrogenation units consist of a hydrogen production unit and a hydrogenation unit. The hydrogen production unit typically dissipates heat through heat exchangers, while the hydrogenation unit includes a crude oil buffer tank, a vacuum tower, and a water cooler. A heating furnace is connected to the rear of the crude oil buffer tank, while a 100N base oil air cooler, a 150N base oil air cooler, and a 500N base oil air cooler are connected in parallel to the rear of the vacuum tower, dissipating heat through the water cooler and air cooler. However, as hydrogenation capacity increases, a significant amount of heat is still wasted during the hydrogen production and hydrogenation processes, resulting in low energy efficiency. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a waste heat recovery system for a hydrogenation device to solve the problems raised in the background technology.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0006] A waste heat recovery system for a hydrogenation unit includes a first heat exchanger replacing a 100N base oil air cooler, a second heat exchanger replacing a 150N base oil air cooler, a third heat exchanger replacing a 500N base oil air cooler, and a fourth heat exchanger arranged behind a heating furnace smoke stack, wherein the cold water inlet of each heat exchanger is connected to the outlet of a cold water pump, the inlet of the cold water pump is connected to a primary water tank, the water inlet of the primary water tank is connected to the water outlet of the water cooler via a cold water supply pipe; and the hot water outlets of the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger, and the original heat exchanger of the hydrogen production unit are connected to the hot water tank and the refrigeration unit via two pipelines.

[0007] Preferably, the outlet of the fourth heat exchanger is provided with a fan for introducing high-temperature flue gas into the fourth heat exchanger and leading the low-temperature flue gas after heat exchange back to the smoke window of the heating furnace for discharge.

[0008] Preferably, the fourth heat exchanger is connected to a condensation water tank for collecting flue gas condensate, and the condensation water tank is connected to a condensation water pump for drawing out the condensation water for use as water for cleaning the floor.

[0009] Preferably, there are two cooling water pumps.

[0010] Preferably, the first heat exchanger, the second heat exchanger and the third heat exchanger are all spiral plate heat exchangers.

[0011] Preferably, the water outlet of the hot water tank is provided with two hot water pumps for pumping out hot water.

[0012] Preferably, the refrigeration unit is provided with a plurality of low-temperature hot water outlets for outputting low-temperature hot water of different temperatures.

[0013] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is as follows.

[0014] The utility model is simple and practical. The newly added first heat exchanger, second heat exchanger and third heat exchanger replace the original 100N base oil air cooler, 150N base oil air cooler and 500N base oil air cooler, thereby realizing heat exchange of various base oils; the newly added fourth heat exchanger can realize heat exchange of exhaust gas outside the heating furnace; through the set hot water tank and refrigeration unit, the hot water after heat exchange can be finally used for heating, sales, vacuum system, etc., effectively reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a principle block diagram of the utility model;

[0016] Figure 2 This is an implementation flow chart of the utility model (refrigeration unit is not shown).

[0017] Among them: 1. First heat exchanger, 2. Second heat exchanger, 3. Third heat exchanger, 4. Fourth heat exchanger, 5. Primary water tank, 6. Hot water tank, 7. Fan, 8. Condensate tank, 9. Condensate pump, 10. Hot water pump, 11. 100N base oil air cooler, 12. 150N base oil air cooler, 13. 500N base oil air cooler. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] A waste heat recovery system for a hydrogenation unit, combined with Figures 1 to 2As shown, it includes a first heat exchanger 1, a second heat exchanger 2, a third heat exchanger 3, and a fourth heat exchanger 4. The first heat exchanger 1, the second heat exchanger 2, and the third heat exchanger 3 are all spiral plate heat exchangers that can be connected in series or in parallel, occupy a small space, and are easy to install. The cold water inlet of the first heat exchanger 1, the second heat exchanger 2, the third heat exchanger 3, the fourth heat exchanger 4, and the original heat exchanger of the hydrogen production unit is connected to a primary water tank 5. The water inlet of the primary water tank 5 is connected to the water outlet of the water cooler via a cold water supply pipe. The primary water tank 5 is used to hold primary water cooled by the water cooler. Two cold water pumps are installed at the water outlet of the primary water tank 5. The two cold water pumps are used to pump the primary water into the first heat exchanger 1, the second heat exchanger 2, the third heat exchanger 3, the fourth heat exchanger 4, and the original heat exchanger of the hydrogen production unit.

[0020] The first heat exchanger 1 replaces the 100N base oil air cooler 11, the second heat exchanger 2 replaces the 150N base oil air cooler 12, and the third heat exchanger 3 replaces the 500N base oil air cooler 13, so that the hot materials originally entering the 100N base oil air cooler 11, the 150N base oil air cooler 12 and the 500N base oil air cooler 13 in the hydrogenation unit enter the first heat exchanger 1, the second heat exchanger 2 and the third heat exchanger 3 in a one-to-one correspondence to exchange heat with primary water, and obtain high-temperature hot water after heat exchange.

[0021] The fourth heat exchanger 4 is located behind the furnace chimney, allowing the hot flue gas discharged from the furnace chimney to be directed to the fourth heat exchanger 4 for heat exchange with primary water, producing high-temperature hot water. Specifically, a fan 7 is provided at the outlet of the fourth heat exchanger 4, which is used to direct the high-temperature flue gas into the fourth heat exchanger 4 and return the low-temperature flue gas after heat exchange to the furnace chimney for discharge. The fourth heat exchanger 4 is connected to a condensate tank 8, which is used to collect condensate from the flue gas. This condensate tank 8 is connected to a condensate pump 9, which is used to discharge the condensate for use as floor cleaning water.

[0022] The hot water outlets of the first heat exchanger 1, the second heat exchanger 2, the third heat exchanger 3, the fourth heat exchanger 4 and the original heat exchanger of the hydrogen production device unit are connected to the hot water tank 6 and the refrigeration unit through two pipes, so that the high-temperature hot water obtained by heat exchange in each heat exchanger flows into the hot water tank 6 and the refrigeration unit; the high-temperature hot water flowing back from the hot water outlet of the original heat exchanger of the hydrogen production device unit can also be connected to the original hydrogen production hot water tank, thereby providing hot water for the area in the hydrogen production device unit that transports hot water to the outside.

[0023] The water outlet of the hot water tank 6 is provided with two hot water pumps 10, which are used to pump out hot water. The pumped hot water can be led to heating users, thereby realizing heating for users; it can also be led to tank trucks, thereby realizing loading of hot water for external sale; it can also be led to the storage tanks that need to be heated in the original tank area tank group for heating, and after heat exchange with the storage tanks, it returns to the water tank 5 for recycling.

[0024] The water inlet of the refrigeration unit is also connected to the low-temperature hot water of the vacuum pump of the hydrogenation unit's vacuum system. The refrigeration unit is equipped with several low-temperature hot water outlets, which are used to output low-temperature hot water at different temperatures. The relatively high-temperature low-temperature hot water can be sent to heating users, while the relatively low-temperature hot water can be sent to the vacuum pump, thereby serving as the refrigerant medium of the vacuum system to achieve heat exchange and cooling of the vacuum pump, thereby improving the efficiency of the vacuum pump.

[0025] When the utility model is in use, the newly added first heat exchanger 1, the second heat exchanger 2 and the third heat exchanger 3 replace the original 100N base oil air cooler 11, the 150N base oil air cooler 12 and the 500N base oil air cooler 13, so as to realize the heat exchange of each base oil; the newly added fourth heat exchanger 4 can realize the heat exchange of the exhaust gas outside the heating furnace; through the provided hot water tank 6 and the refrigeration unit, the hot water after heat exchange can be finally used for heating, selling, vacuum system, etc., thereby effectively reducing energy consumption.

Claims

1. A waste heat recovery system for a hydrogenation unit, characterized by: The invention comprises a first heat exchanger (1) for replacing a 100N base oil air cooler (11), a second heat exchanger (2) for replacing a 150N base oil air cooler (12), a third heat exchanger (3) for replacing a 500N base oil air cooler (13), and a fourth heat exchanger (4) arranged behind a smoke window of a heating furnace, wherein the cold water inlet of each heat exchanger is connected to the outlet of a cold water pump, the inlet of the cold water pump is connected to a primary water tank (5), and the water inlet of the primary water tank (5) is connected to the water outlet of the water cooler through a cold water upper water pipe; and the hot water outlets of the first heat exchanger (1), the second heat exchanger (2), the third heat exchanger (3), the fourth heat exchanger (4), and the original heat exchanger of the hydrogen production device unit are connected to a hot water tank (6) and a refrigeration unit through two pipelines.

2. The waste heat recovery system of a hydrogenation device according to claim 1, characterized in that: The outlet of the fourth heat exchanger (4) is provided with a fan (7) for introducing high-temperature flue gas into the fourth heat exchanger (4) and guiding the low-temperature flue gas after heat exchange back to the smoke window of the heating furnace for discharge.

3. The waste heat recovery system of a hydrogenation device according to claim 1, characterized in that: The fourth heat exchanger (4) is connected to a condensation water tank (8) for collecting flue gas condensation water, and the condensation water tank (8) is connected to a condensation water pump (9) for drawing out the condensation water for use as water for cleaning the floor.

4. The waste heat recovery system of a hydrogenation device according to claim 1, characterized in that: There are two cold water pumps.

5. The waste heat recovery system of a hydrogenation device according to claim 1, characterized in that: The first heat exchanger (1), the second heat exchanger (2) and the third heat exchanger (3) are all spiral plate heat exchangers.

6. The waste heat recovery system of a hydrogenation device according to claim 1, characterized in that: The water outlet of the hot water tank (6) is provided with two hot water pumps (10) for pumping out hot water.

7. The waste heat recovery system of a hydrogenation device according to claim 1, characterized in that: The refrigeration unit is provided with a plurality of low-temperature hot water outlets for outputting low-temperature hot water of different temperatures.

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