A medium-pressure waste heat recovery device

Abstract

The present invention provides a medium-pressure waste heat recovery device, which relates to the technical field of waste heat recovery. It aims to solve the problems existing in the existing waste heat recovery devices during use, such as low heat exchange efficiency, low quality of the produced steam, short equipment life, and easy large resistance caused by scaling and ash hanging. It includes a waste heat recovery device, a steam-water separation and pressure stabilization device, and a feed water system; the waste heat recovery device and the steam-water separation and pressure stabilization device are respectively connected through a riser pipe and a downcomer. In the waste heat recovery device of the present invention, it includes an inlet guide section and a heat exchange section. The inlet guide section adopts a flared guide cylinder. The shell side of the heat exchange section is connected to the riser pipe and the downcomer, which avoids the high-speed scouring of high-temperature flue gas at the tube sheet and reduces the resistance caused by the change of flue gas flow pattern. At the same time, according to the flue gas characteristics of different carbon black varieties, different flue gas flow velocities can be selected inside the tubes of the heat exchange section to balance reducing the adhesion of carbon black to the inside of the tubes due to temperature change while ensuring a certain pressure drop.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and more specifically, to a medium-pressure waste heat recovery device. Background Art

[0002] Carbon black enterprises have great potential for waste heat utilization, and waste heat utilization plays an important role in current energy conservation. The recycling of waste heat resources requires process needs, technical feasibility, economic rationality and environmental protection. The waste heat recovery devices used in the original carbon black industry have a series of problems in use, such as low heat exchange efficiency, low steam pressure (often less than 0.5MPa), short equipment life, and easy resistance due to scaling and ash hanging, which affects carbon black production, and low heat exchange efficiency. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a waste heat recovery device to solve the problems of low heat exchange efficiency, low quality of steam produced, short equipment life, and high resistance caused by scaling and dust accumulation in existing waste heat recovery devices.

[0004] The purpose and effect of the waste heat recovery device of the present invention are achieved by the following specific technical means:

[0005] A medium-pressure waste heat recovery device comprises a waste heat recovery device, a steam-water separation pressure stabilizing device and a water supply system; the waste heat recovery device and the steam-water separation pressure stabilizing device are connected to each other through an ascending pipe and a descending pipe respectively; a partition plate is horizontally installed in the inner cavity of the steam-water separation pressure stabilizing device, the front end of the partition plate is connected to the front end side wall of the inner cavity of the steam-water separation pressure stabilizing device, the rear end of the partition plate is an upwardly curved guide plate, and a gap is left between the guide plate and the rear end of the inner cavity of the steam-water separation pressure stabilizing device.

[0006] Optionally, the waste heat recovery device includes upper and lower inlet guide sections and a heat exchange section. The upper and lower inlet guide sections adopt flared guide tubes. The shell side of the heat exchange section is connected with the riser and the downcomer. Vertical honeycomb heat exchange tubes are installed in the heat exchange section.

[0007] Optionally, a water supply pipe is provided in the middle of the front end of the steam-water separation and pressure-stabilizing device, and the water supply pipe extends to the middle of the inner cavity of the steam-water separation and pressure-stabilizing device.

[0008] Optionally, a steam outlet is provided at the upper end of the steam-water separation pressure stabilizing device, the upper end of the steam outlet is merged into the steam main pipe, and a collecting hood with a narrow upper part and a wide lower part is provided at the lower end of the steam outlet.

[0009] Optionally, the inner cavity of the steam-water separation pressure stabilizing device, the ascending pipe, the descending pipe and the heat exchange section form an internal circulation.

[0010] Optionally, the steam-water separation pressure stabilizing device is installed at a position higher than the upper end of the waste heat recovery device.

[0011] Optionally, a liquid level meter is installed in the steam-water separation pressure stabilizing device.

[0012] Optionally, a heat-insulating layer is provided in the shell of the steam-water separation and pressure-stabilizing device, and the heat-insulating layer is filled with heat-insulating cotton.

[0013] Optionally, blocking ball columns are evenly spaced upward on the top plane of the partition plate, the upper ends of the blocking ball columns are ball head structures, and partition columns are symmetrically fixedly installed on the top plane of the partition plate, and the inner end of the water supply pipe is in the area between the front and rear partition columns.

[0014] Optionally, an arc-shaped condensation plate is provided at the top of the rear end of the inner cavity of the steam-water separation pressure stabilizing device, and the lower part of the condensation plate faces the gap between the rear end of the partition plate and the steam-water separation pressure stabilizing device.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The waste heat recovery device of the present invention includes an inlet guide section and a heat exchange section. The inlet guide section adopts a flared guide tube. The shell side of the heat exchange section is connected with the riser and the downcomer to avoid high-speed scouring of high-temperature flue gas at the tube sheet and reduce the resistance caused by changes in flue gas flow patterns. At the same time, different flue gas flow rates can be selected in the heat exchange section tube according to the flue gas characteristics of different carbon black varieties, so as to ensure a certain resistance drop while reducing the carbon black adhering to the inside of the tube due to temperature changes.

[0017] 2. In the present invention, the water supply pipe extends to the middle of the inner cavity of the steam-water separation pressure stabilizing device, which ensures efficient heat exchange while reducing the impact of water fluctuations on the heat exchange tubes, effectively avoiding the entrainment of water in the steam, effectively protecting the safety of the steam transmission pipeline, and reducing the risk of water hammer during steam transmission.

[0018] 3. In the present invention, the inner cavity, the riser, the downcomer and the heat exchange section of the steam-water separation pressure stabilizing device form an internal circulation, which increases the heat exchange efficiency and reduces the influence of the gas phase space in the heat exchange section on the scouring of the equipment.

[0019] 4. In the present invention, the partition plate can be used to make the hot water entering from the ascending pipe flow in the upper layer, which is convenient for the production of steam, and the guide plate is at the rear end, so that the hot water in the upper layer moves up along the guide plate when flowing to the rear end, so that part of the excess steam can be condensed under the action of the condensation plate, and the condensed water can slide into the gap at the rear end of the partition plate, and gather in the inner cavity of the steam-water separation pressure stabilizing device under the partition plate, and then flow back to the waste heat recovery device through the downcomer for heat exchange, so that the whole process is interconnected and does not affect each other, thereby ensuring the stable production of steam.

[0020] 5. In the present invention, blocking ball columns are evenly spaced upward on the top plane of the partition plate, and the upper ends of the blocking ball columns are ball head structures. Partition columns are symmetrically fixedly installed on the top plane of the partition plate. The inner end of the water supply pipe is located in the area between the front and rear partition columns, so that the hot water can stay above the partition plate for a long time after entering, so that the hot water in a high temperature state can evaporate more steam and achieve the highest waste heat recovery effect. The blocking ball columns can also provide a certain heat storage capacity, so that the equipment can always be in a high temperature state during use, reducing the thermal energy difference supplement after the hot water enters, and further improving the steam output and heat retention.

[0021] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0023] Figure 2 It is a main structural schematic diagram of the present invention.

[0024] Figure 3 It is a schematic diagram of the axial structure of the waste heat recovery device shell in a half-cut and separated state of the present invention.

[0025] Figure 4 The present invention Figure 3 A is a schematic diagram of the structure of the enlarged part.

[0026] Figure 5 It is a schematic diagram of the axial structure of a partial shell of the steam-water separation and pressure-stabilizing device of the present invention in a half-cut apart state.

[0027] Figure 6 It is a schematic diagram of the structure of the steam-water separation and pressure-stabilizing device of the present invention in a partially fully cut-away front axle view.

[0028] Figure 7 The present invention is a schematic diagram of the structure of the steam-water separation and pressure-stabilizing device in a partially fully cut-away axial view.

[0029] Figure 8 It is a schematic diagram of the axial structure of the steam-water separation and pressure-stabilizing device of the present invention with a partially half-sectioned shell removed.

[0030] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0031] 1. Waste heat recovery device; 101. Expanded guide tube; 102. Heat exchange tube; 2. Riser; 3. Downcomer; 4. Steam-water separation and pressure stabilizing device; 401. Steam outlet; 40102. Collecting hood; 402. Water supply pipe; 403. Insulation layer; 5. Partition plate; 501. Blocking ball column; 502. Guide plate; 503. Partition column; 6. Condensation plate. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0033] Example:

[0034] As attached Figure 1 To Attachment Figure 8 As shown:

[0035] The present invention provides a medium-pressure waste heat recovery device, comprising a waste heat recovery device 1, a steam-water separation pressure stabilizing device 4 and a water supply system; the waste heat recovery device 1 and the steam-water separation pressure stabilizing device 4 are connected through an ascending pipe 2 and a descending pipe 3 respectively; a partition plate 5 is horizontally installed in the inner cavity of the steam-water separation pressure stabilizing device 4, the front end of the partition plate 5 is in contact with the front end side wall of the inner cavity of the steam-water separation pressure stabilizing device 4, the rear end of the partition plate 5 is an upwardly curved guide plate 502, a gap is left between the guide plate 502 and the rear end of the inner cavity of the steam-water separation pressure stabilizing device 4, an arc-shaped condensing plate 6 is arranged on the top of the rear end of the inner cavity of the steam-water separation pressure stabilizing device 4, and the lower part of the condensing plate 6 is directly opposite to the rear end of the partition plate 5. The gap between the end and the steam-water separation and pressure-stabilizing device 4 can be made through the partition plate 5 so that the hot water entering from the riser 2 flows in the upper layer, which is convenient for the production of steam, and the guide plate 502 is at the rear end, so that the hot water in the upper layer moves up along the guide plate 502 when flowing to the rear end, so that part of the excess steam can be condensed under the action of the condensation plate 6, and the condensed water can slide to the gap at the rear end of the partition plate 5, and gather in the inner cavity of the steam-water separation and pressure-stabilizing device 4 under the partition plate 5, and then flow back to the waste heat recovery device 1 through the downcomer 3 for heat exchange, so that the whole process is interconnected and does not affect each other, thereby ensuring the stable production of steam.

[0036] Among them, the waste heat recovery device 1 includes an inlet guide section and a heat exchange section. The upper and lower inlet guide sections adopt an expanded guide tube 101. The shell side of the heat exchange section is connected with the riser 2 and the downcomer 3. A vertical honeycomb heat exchange tube 102 is installed in the heat exchange section to improve the heat exchange efficiency, avoid high-speed scouring of high-temperature flue gas at the tube sheet and reduce the resistance caused by changes in flue gas flow patterns. At the same time, different flue gas flow rates can be selected in the heat exchange section tube according to the flue gas characteristics of different carbon black varieties, so as to ensure a certain resistance drop while reducing the balance between the carbon black adhering to the inside of the tube due to temperature changes.

[0037] Among them, a water supply pipe 402 is provided in the middle of the front end of the steam-water separation and pressure-stabilizing device 4, and the water supply pipe 402 extends to the middle of the inner cavity of the steam-water separation and pressure-stabilizing device 4, ensuring efficient heat exchange while reducing the impact of water fluctuations on the heat exchange tubes, effectively avoiding the entrainment of water in the steam, effectively protecting the safety of the steam transmission pipeline, and reducing the risk of water hammer during steam transmission.

[0038] Among them, a steam outlet 401 is provided at the upper end of the steam-water separation pressure-stabilizing device 4, and the upper end of the steam outlet 401 is merged into the steam main pipe. A collecting hood 40102 which is narrow at the top and wide at the bottom is provided at the lower end of the steam outlet 401, which helps to guide the collected steam to discharge, avoids flow fluctuations affecting the water level changes inside the heat exchange section, and also stabilizes the water temperature entering the heat exchange section.

[0039] A heat-insulating layer 403 is provided in the shell of the steam-water separation and pressure-stabilizing device 4 , and the heat-insulating layer 403 is filled with heat-insulating cotton to reduce heat loss during the steam-water separation process.

[0040] Among them, the inner cavity of the steam-water separation pressure stabilizing device 4, the ascending pipe 2, the descending pipe 3 and the heat exchange section form an internal circulation, which increases the heat exchange efficiency and reduces the influence of the gas phase space in the heat exchange section on the scouring of the equipment.

[0041] The steam-water separation pressure stabilizing device 4 is installed at a position higher than the upper end of the waste heat recovery device 1, which can ensure that the inner cavity of the steam-water separation pressure stabilizing device 4, the riser 2, the downcomer 3 and the heat exchange section form an internal circulation.

[0042] Among them, a liquid level meter is installed in the steam-water separation pressure stabilizing device 4 to monitor the internal liquid level changes, thereby ensuring the liquid level fluctuation range in the steam-water separator and reducing the flow fluctuation range and outlet steam quality.

[0043] Among them, blocking ball columns 501 are evenly spaced upward on the top plane of the partition plate 5, and the upper ends of the blocking ball columns 501 are ball head structures. Partition columns 503 are fixedly installed symmetrically on the top plane of the partition plate 5. The inner end of the water supply pipe 402 is located in the area between the front and rear partition columns 503, so that the hot water can stay above the partition plate 5 for a long time after entering, so that the hot water in a high temperature state at this time can evaporate more steam and achieve the highest waste heat recovery effect. The blocking ball columns 501 can also provide a certain heat storage capacity, so that the equipment can always be in a high temperature state during use, reducing the thermal energy difference supplement after the hot water enters, and further improving the steam output and heat retention.

[0044] The specific usage and function of this embodiment are as follows:

[0045] Use 105 degrees Celsius desalted water for water replenishment. According to the evaporation amount, reselect the appropriate water replenishment pump. The design capacity of the pump is between 1.5 and 2.0 of the evaporation amount. The pressure is selected according to the design pressure. The maximum and minimum amounts are calculated according to the type of carbon black produced and the production capacity, and the optimal pump is selected. Different steam outlet pressures are controlled according to different types of carbon black to stabilize the water supply. The waste heat recovery device 1 and the steam-water separation pressure stabilizing device 4 are connected through the riser 2 and the downcomer 3 respectively. When the high-temperature airflow passes through the heat exchange section of the waste heat recovery device 1, the water in the heat exchange section can be heated, and the water in the heat exchange section is connected to the steam-water separation pressure stabilizing device 4 through the riser 2 and the downcomer 3, so that the hot water rises through the riser 2, and the cold water enters the heat exchange section through the downcomer 3 for heat exchange, and the steam is discharged through the steam outlet 40 to realize waste heat recovery.

Claims

1. A medium pressure waste heat recovery device, Features: The invention comprises a waste heat recovery device (1), a steam-water separation pressure stabilizing device (4) and a water supply system; the waste heat recovery device (1) and the steam-water separation pressure stabilizing device (4) are connected to each other through an ascending pipe (2) and a descending pipe (3) respectively; a partition plate (5) is horizontally installed in the inner cavity of the steam-water separation pressure stabilizing device (4); the front end of the partition plate (5) is in contact with the front end side wall of the inner cavity of the steam-water separation pressure stabilizing device (4); the rear end of the partition plate (5) is an upwardly curved guide plate (502); a gap is left between the guide plate (502) and the rear end of the inner cavity of the steam-water separation pressure stabilizing device (4); an arc-shaped condensing plate (6) is provided at the top of the rear end of the inner cavity of the steam-water separation pressure stabilizing device (4); the lower part of the condensing plate (6) is directly opposite to the gap between the rear end of the partition plate (5) and the steam-water separation pressure stabilizing device (4).

2. A medium-pressure waste heat recovery device as claimed in claim 1, Features: The waste heat recovery device (1) comprises upper and lower inlet guide sections and a heat exchange section. The upper and lower inlet guide sections adopt an expanded guide tube (101). The shell side of the heat exchange section is connected to the riser (2) and the downcomer (3). Vertical honeycomb heat exchange tubes (102) are installed in the heat exchange section.

3. A medium-pressure waste heat recovery device as claimed in claim 1, Features: A water supply pipe (402) is provided at the middle of the front end of the steam-water separation and pressure-stabilizing device (4), and the water supply pipe (402) extends to the middle of the inner cavity of the steam-water separation and pressure-stabilizing device (4).

4. A medium-pressure waste heat recovery device as claimed in claim 1, Features: The steam-water separation pressure stabilizing device (4) is provided with a steam outlet (401) at the upper end, the upper end of the steam outlet (401) is connected to the steam main pipe, and the lower end of the steam outlet (401) is provided with a collection cover (40102) that is narrow at the top and wide at the bottom.

5. A medium-pressure waste heat recovery device as claimed in claim 1, Features: The inner cavity of the steam-water separation pressure stabilizing device (4), the ascending pipe (2), the descending pipe (3) and the heat exchange section form an internal circulation.

6. A medium-pressure waste heat recovery device as claimed in claim 1, Features: The steam-water separation pressure stabilizing device (4) is installed at a position higher than the upper end of the waste heat recovery device (1).

7. A medium-pressure waste heat recovery device as claimed in claim 1, Features: A liquid level meter is installed in the steam-water separation pressure stabilizing device (4).

8. A medium-pressure waste heat recovery device as claimed in claim 1, Features: A heat-insulating layer (403) is provided in the shell of the steam-water separation and pressure-stabilizing device (4), and the heat-insulating layer (403) is filled with heat-insulating cotton.

9. A medium-pressure waste heat recovery device as claimed in claim 3, Features: Blocking ball columns (501) are evenly spaced and arranged upward on the top plane of the partition plate (5), the upper ends of the blocking ball columns (501) are ball head structures, and partition columns (503) are symmetrically fixedly installed on the top plane of the partition plate (5), and the inner end of the water supply pipe (402) is located in the area between the front and rear two partition columns (503).

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