A vertical quench heat exchanger for preventing dirt accumulation on the first baffle

Abstract

The present invention relates to the technical field of vertical rapid cooling heat exchangers, and specifically to a vertical rapid cooling heat exchanger that prevents dirt from accumulating on the first baffle. The lower end of the cylinder is provided with a water inlet pipe and a guide plate. The guide plate and the partial inner wall of the cylinder together form a guide channel for guiding the liquid entering from the water inlet pipe downward. Multiple baffles are arranged axially along the cylinder. The lowest first baffle corresponds to the guide plate. The first baffle is arranged radially and tilted relative to the horizontal direction of the cylinder and is located at a low position close to the guide plate. The cylinder is penetrated by a first sewage pipe. The inner port of the first sewage pipe is in the shape of an elongated hole and passes through the guide plate to connect to the low position of the first baffle. During use, dirt on the first baffle will flow to the low position where the baffle is tilted and then be discharged through the first sewage pipe, thereby avoiding the problem of active dirt on the first baffle and overheating and overburning at this position.

Description

Technical Field

[0001] The invention relates to the technical field of vertical rapid cooling heat exchangers, in particular to a vertical rapid cooling heat exchanger capable of preventing dirt accumulation on a first baffle. Background Art

[0002] The quench heat exchanger is a critical piece of equipment in an ethylene cracker, requiring high process control. It performs two primary tasks: first, rapidly cooling the high-temperature cracked gas (around 800°C) to below the secondary reaction temperature, minimizing olefin losses; and second, recovering as much of the high-grade heat energy from the cracked gas as possible, generating high-pressure steam at approximately 12.0 MPa. The gas side of the quench heat exchanger consists of three major components: the inlet distributor, heat exchange tubes, and the outlet header. The cracked gas passes through the inlet distributor, where it is decelerated (generally <10 m / s) and expanded, converting as much kinetic energy as possible into static pressure. This minimizes uneven flow distribution at the inlet of the heat exchange tubes, caused by high and uneven gas velocity and unequal inlet airflow angles. The distributor should evenly distribute the gas to each heat exchange tube. Generally, the maximum possible flow rate deviation should be less than ±10%. The residence time of the gas within the distributor should be minimized, and dead-end vortex zones should be avoided to suppress secondary reactions in the cracked gas and ensure ethylene product yields.

[0003] like Figure 6 The figure shows a partial structure of a rapid cooling heat exchanger proposed by the inventor. This technology has not yet been made public. It shows a partial cylinder 01, a lower tube sheet 02 and a plurality of heat exchange tubes 03. The connection relationship between these three is the same as that of the prior art. The lower tube sheet 02 is fixed to the lower end of the cylinder 01. The plurality of heat exchange tubes 03 are arranged in parallel in the shell side of the cylinder 01 and pass through the lower tube sheet 02 to connect to the lower tube side. The cylinder 01 is provided with a water inlet pipe 04. The water inlet pipe 04 is at a distance from the lower tube sheet 02. In order to avoid the accumulation of dirt on the lower tube sheet 02, the rapid cooling heat exchanger is provided with a guide plate 05. The guide plate 05 is arranged in an arc shape inside the cylinder 01. Between the guide plate 05 and the inner wall of the cylinder 01: the top and the sides are sealed, and the bottom has an opening. As shown Figure 5 As shown in the figure, after the water from the water inlet pipe 04 enters the cylinder 01, it first hits the lower tube plate 02 downward under the action of the guide plate 05, and then reflects and flows upward.

[0004] Problems:

[0005] This quench heat exchanger features multiple transversely arranged baffles 06 along the axial direction of the cylinder 01. Some of these baffles 06 correspond to guide plates 05, with the first baffle 06 at the bottom located at guide plate 05. Based on the direction of water flow entering through the water inlet pipe 04, a slow-flow zone exists on the upper surface of baffle 06 near guide plate 05. This slow-flow zone is prone to fouling on the upper surface of guide plate 05, potentially leading to overheating and overburning. Summary of the Invention

[0006] In view of the above technical problems in the prior art, the present invention provides a vertical quench heat exchanger which can prevent the first baffle from accumulating dirt.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] Provided is a vertical quench heat exchanger for preventing dirt accumulation on the first baffle, comprising a cylinder, an upper tube sheet, an upper tube box, a lower tube sheet, a lower tube box, and a plurality of heat exchange tubes. The upper tube sheet and the lower tube sheet are respectively fixed to the two ends of the cylinder and together form a shell-side space. The upper tube box is fixed to the upper tube sheet and together form an upper tube-side space. The lower tube box is fixed to the lower tube sheet and together form a lower tube-side space. The plurality of heat exchange tubes are located in the shell-side space, and their upper ends pass through the upper tube sheet to communicate with the upper tube-side space, while their lower ends pass through the lower tube sheet to communicate with the lower tube-side space. The invention is characterized in that:

[0009] A water inlet pipe and a guide plate are provided at the lower end of the cylinder. The guide plate and the local inner wall of the cylinder together form a guide channel for guiding the liquid entering from the water inlet pipe downward. A plurality of baffles are arranged along the axial direction of the cylinder. The first baffle at the bottom corresponds to the guide plate. The first baffle is arranged with an inclined radial direction relative to the horizontal direction of the cylinder, and its low position is close to the guide plate. A first sewage pipe is passed through the cylinder, and the inner port of the first sewage pipe is connected to the low position of the first baffle.

[0010] Furthermore, the first baffle is a straight plate, and its height gradually decreases towards the guide plate.

[0011] Furthermore, the first deflector plate is a stepped plate, the height of each step gradually decreases towards the guide plate, and the inclination angles of each step are the same or different.

[0012] Furthermore, the inner port of the first sewage pipe is flush with the lower position of the upper end surface of the first baffle.

[0013] Furthermore, the cylinder is also provided with a plurality of second sewage pipes connected to the top surface of the lower tube plate. The plurality of second sewage pipes are arranged circumferentially around the cylinder. The plurality of second sewage pipes are connected to a ring pipe outside the cylinder, and the first sewage pipe is connected to the ring pipe.

[0014] Furthermore, the first sewage pipe is a three-way pipe, the left sewage port of which is connected to the first baffle, the lower sewage port is connected to the ring pipe, and the right cleaning port is in a normally closed state.

[0015] Furthermore, the guide plate is an arc-shaped plate arranged in parallel with the inner wall of the cylinder, and the upper end and both sides of the guide plate are closed and connected to the inner wall of the cylinder, thereby forming the guide channel.

[0016] Furthermore, there are two water inlet pipes, and the two water inlet pipes are symmetrically arranged outside the cylinder, and the arc of the guide plate is greater than 180°, so that the two water inlet pipes are connected to the diversion channel.

[0017] Furthermore, the inner port of the first sewage pipe passes through the guide plate and is in an arc shape flush with the end surface of the guide plate. In practice, the first sewage pipe can be changed to pass through the first baffle from bottom to top and connect to its lower position.

[0018] Furthermore, the first baffle is located at the lower end of the guide plate and partially extends transversely and is fixed to the inner wall of the cylinder.

[0019] Preferably, the inner port of the first sewage pipe is in the shape of an elongated hole, a triangle, a square, a rectangular or a polygon.

[0020] Beneficial effects of the present invention:

[0021] The vertical rapid cooling heat exchanger of the present invention, which prevents dirt accumulation on the first baffle, solves the problem that dirt easily accumulates on the bottom first baffle. Since the baffle is arranged at an angle, the dirt on the first baffle will flow downward and be discharged through the first sewage pipe at a low position near the guide plate. Therefore, the problem of active dirt accumulation on the first baffle can be avoided, and overheating and overburning at this location can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional diagram of the local structure of the vertical quench heat exchanger in the embodiment, hiding the cylinder part and the upper tube plate and other structures.

[0023] Figure 2 for Figure 1 A sectional perspective view of .

[0024] Figure 3 It is a partial structural plan view of the vertical quench heat exchanger in the embodiment, mainly illustrating the horizontal radial inclined arrangement of the first baffle relative to the cylinder and the relative position of the first sewage pipe.

[0025] Figure 4 This is a diagram showing the matching relationship of the first baffle of the guide plate in the embodiment.

[0026] Figure 5 Schematic diagrams of several transverse projections of the first sewage pipe in the embodiment.

[0027] Figure 6 Schematic diagram of a heat exchanger according to background technology.

[0028] Figure 6 Reference numerals:

[0029] Cylinder 01, lower tube plate 02, heat exchange tube 03, water inlet pipe 04, guide plate 05, baffle 06.

[0030] Figures 1 to 5 Reference numerals:

[0031] Cylinder 1, lower tube plate 2, heat exchange tube 3, water inlet pipe 4, guide plate 5, baffle 6, first sewage pipe 7, second sewage pipe 8, and ring pipe 9. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to specific embodiments and accompanying drawings.

[0033] The vertical quench heat exchanger of this embodiment is as follows Figures 1 to 6 As shown, it includes a cylinder 1, an upper tube sheet, an upper tube box, a lower tube sheet 2, a lower tube box, and multiple heat exchange tubes 3. The upper tube sheet and the lower tube sheet 2 are respectively fixed to the two ends of the cylinder 1 and together enclose the shell-side space. The upper tube box is fixed to the upper tube sheet and together enclose the upper tube-side space. The lower tube box is fixed to the lower tube sheet 2 and together enclose the lower tube-side space. The multiple heat exchange tubes 3 are located in the shell-side space, and their upper ends pass through the upper tube sheet to connect to the upper tube-side space, and their lower ends pass through the lower tube sheet 2 to connect to the lower tube-side space. The above structure is the conventional structure of the existing quench heat exchanger. The improvements of this application are:

[0034] Two water inlet pipes 4 are symmetrically arranged and welded to the outer wall of the cylinder 1, serving as the inlet for the cooling medium. A deflector 5 is also located on the inner side of the lower end of the cylinder 1. The deflector 5 is an arc-shaped plate parallel to the inner wall of the cylinder 1. The upper end and both sides of the deflector 5 are sealed and connected to the inner wall of the cylinder 1, forming a diversion channel for guiding the liquid entering from the water inlet pipes 4 downward. The deflector 5 has an arc greater than 180°, so that both water inlet pipes 4 are connected to the diversion channel. During operation, the cooling medium enters the water inlet pipes 4, and under the guidance of the deflector 5, it strikes the upper end surface of the lower tube sheet 2 downward, then returns and flows upward.

[0035] In this embodiment, a plurality of baffles 6 are arranged axially along the cylinder 1, and the first baffle 6 at the bottom corresponds to the guide plate 5. Specifically, the first baffle 6 is located at the lower end of the guide plate 5, and is partially extended laterally and fixed to the inner wall of the cylinder 1. The first baffle 6 is arranged obliquely relative to the horizontal direction, and its low position is located near the guide plate 5. The cylinder 1 is penetrated by a first sewage pipe 7, and the inner port of the first sewage pipe 7 passes through the guide plate 5 and is connected to the low position of the first baffle 6, and the long axis of the long hole is arranged circumferentially. In order to solve the problem that the first baffle 6 at the bottom is prone to dirt accumulation, since the baffle 6 is arranged obliquely, the dirt on the first baffle 6 will flow to a lower position and be discharged through the first sewage pipe 7 at a low position near the guide plate 5, thereby avoiding the problem of active dirt on the first baffle 6 and overheating and overburning at this position. Furthermore, the inner port of the first sewage pipe 7 is in the shape of a long hole, a triangle, a square, a rectangle or a polygon, and has a large connecting area with the low position of the first baffle 6, so that sewage can be discharged smoothly to avoid blockage and the sewage discharge effect is better. Compared with small round holes, these shapes have a straight edge and can be straight and flush with the top surface of the first baffle 6.

[0036] In practice, the inner port of the first sewage pipe 7 is an arc-shaped port flush with the end face of the guide plate 5, and the port transition is smooth. The inner port of the first sewage pipe 7 is flush with the lower position of the upper end face of the first baffle 6, making it easier to discharge dirt.

[0037] In practice, the first baffle 6 can be a straight plate, the height of which gradually decreases as it approaches the guide plate 5. Alternatively, the first baffle 6 can be a stepped plate, the height of each step gradually decreases as it approaches the guide plate 5, the inclination angles of each step being the same or different, and the inclination amplitude of each step gradually decreases as it approaches the guide plate 5.

[0038] In this embodiment, the cylinder 1 is further provided with multiple second drain pipes 8 connected to the top surface of the lower tube sheet 2. These multiple second drain pipes 8 are arranged circumferentially around the cylinder 1 and are used to drain dirt from the end surface of the lower tube sheet 2. These multiple second drain pipes 8 are connected in parallel outside the cylinder 1 via an annular pipe 9. The first drain pipe 7 is a three-way pipe, with its left drain port connected to the first baffle 6, its lower drain port connected to the annular pipe, and its right cleaning port in a normally closed state. This normally closed port can be opened when needed to allow high-pressure water to be injected to clean the upper end surface of the first baffle 6.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0040] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A vertical quench heat exchanger for preventing dirt accumulation on the first baffle, comprising a cylinder, an upper tube sheet, an upper tube box, a lower tube sheet, a lower tube box, and a plurality of heat exchange tubes. The upper tube sheet and the lower tube sheet are respectively fixed to the two ends of the cylinder and together form a shell-side space. The upper tube box is fixed to the upper tube sheet and together form an upper tube-side space. The lower tube box is fixed to the lower tube sheet and together form a lower tube-side space. The plurality of heat exchange tubes are located in the shell-side space, and their upper ends pass through the upper tube sheet to communicate with the upper tube-side space, while their lower ends pass through the lower tube sheet to communicate with the lower tube-side space. The plurality of heat exchange tubes are characterized by: A water inlet pipe and a guide plate are provided at the lower end of the cylinder. The guide plate and the partial inner wall of the cylinder together form a guide channel for guiding the liquid entering from the water inlet pipe downward. A plurality of baffles are arranged along the axial direction of the cylinder. The first baffle at the bottom corresponds to the guide plate. The first baffle is arranged radially and tilted relative to the horizontal direction of the cylinder, and is located at a low position close to the guide plate. A first sewage pipe passes through the cylinder, and the inner port of the first sewage pipe is connected to the low position of the first baffle. The first baffle is a straight plate, and its height gradually decreases towards the guide plate.

2. A vertical quench heat exchanger for preventing dirt accumulation on the first baffle according to claim 1, characterized in that: The inner port of the first sewage pipe is flush with the lower position of the upper end surface of the first baffle.

3. The vertical quench heat exchanger for preventing dirt accumulation on the first baffle according to claim 1, characterized in that: The cylinder is also provided with a plurality of second sewage pipes connected to the top surface of the lower tube plate. The plurality of second sewage pipes are arranged circumferentially around the cylinder. The plurality of second sewage pipes are connected to a ring pipe outside the cylinder, and the first sewage pipe is connected to the ring pipe.

4. A vertical quench heat exchanger for preventing dirt accumulation on the first baffle according to claim 3, characterized in that: The first sewage pipe is a three-way pipe, the left sewage port of which is connected to the first baffle, the lower sewage port is connected to the ring pipe, and the right cleaning port is in a normally closed state.

5. The vertical quench heat exchanger for preventing dirt accumulation on the first baffle according to claim 1, characterized in that: The guide plate is an arc-shaped plate arranged in parallel on the inner wall of the cylinder. The upper end and both sides of the guide plate are closed and connected to the inner wall of the cylinder, thereby forming the guide channel.

6. A vertical quench heat exchanger for preventing dirt accumulation on the first baffle according to claim 5, characterized in that: There are two water inlet pipes, and the two water inlet pipes are symmetrically arranged outside the cylinder. The arc of the guide plate is greater than 180 degrees, so that the two water inlet pipes are connected to the diversion channel.

7. A vertical quench heat exchanger for preventing dirt accumulation on the first baffle according to claim 5, characterized in that: The inner port of the first sewage pipe passes through the guide plate and is in an arc shape that is flush with the end surface of the guide plate.

8. The vertical quench heat exchanger for preventing dirt accumulation on the first baffle according to claim 1, characterized in that: The inner port of the first sewage pipe is in the shape of an elongated hole, a triangle, a square, a rectangular or a polygon.

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