Acetic acid evaporator

Abstract

The present invention provides an acetic acid evaporator, which ensures stable and uniform gas delivery and uniform and reliable liquid distribution, thereby ensuring uniform and reliable heat energy utilization and evaporation effect. The evaporator comprises: an upper elliptical head; a first cylinder; a second cylinder; a conical shell; a third cylinder; a fourth cylinder; a lower elliptical head; a skirt; a double-row blade gas distributor; a packing assembly comprising a packing support, a packing, and a packing pressure plate; a liquid acetic acid distribution assembly comprising a downcomer assembly, a two-stage diversion channel, and a trough-type liquid distributor; a gas outlet is provided at the top center of the upper elliptical head, the lower outer ring of the upper elliptical head is fixedly connected to the upper outer ring of the first cylinder, the lower outer ring of the first cylinder is fixedly connected to the lower outer ring of the second cylinder, the lower outer ring of the second cylinder is fixedly connected to the upper small-diameter cylinder of the conical shell, and the lower large-diameter cylinder of the conical shell is fixedly connected to the upper outer ring of the third cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporator structures, in particular to an acetic acid evaporator. Background Art

[0002] In an existing acetic acid evaporator, raw gas is fed into the evaporator from the bottom, and liquid acetic acid is fed into the evaporator from the middle and upper part. In the middle of the evaporator, the raw gas passes through a filler and is mixed with the liquid acetic acid. Due to the large tower diameter, the existing structure results in uneven distribution of the raw material, which in turn causes uneven evaporation of the subsequent acetic acid and relatively low thermal energy utilization. Therefore, there is an urgent need to develop an acetic acid evaporator with uniform material distribution. Summary of the Invention

[0003] In response to the above problems, the present invention provides an acetic acid evaporator, which ensures stable and uniform gas delivery and uniform and reliable distribution of liquid, thereby ensuring uniform and reliable utilization of heat energy and guaranteeing evaporation effect.

[0004] The acetic acid evaporator is characterized in that it comprises:

[0005] Upper elliptical head;

[0006] a first cylinder;

[0007] a second cylinder;

[0008] cone shell;

[0009] The third cylinder;

[0010] Fourth cylinder;

[0011] Lower elliptical head;

[0012] Skirt seat;

[0013] Double-row blade type gas distributor;

[0014] A packing assembly, comprising a packing support, a packing, and a packing pressure plate;

[0015] A liquid acetic acid distribution assembly, comprising a downcomer assembly, a two-stage diversion channel, and a trough-type liquid distributor;

[0016] An air outlet is provided at the top center position of the upper elliptical head, the lower outer ring surface of the upper elliptical head is fixedly connected to the upper outer ring of the first cylinder, the lower outer ring of the first cylinder is fixedly connected to the lower outer ring of the second cylinder, the lower outer ring of the second cylinder is fixedly connected to the upper small-diameter cylinder of the conical shell, the lower large-diameter cylinder of the conical shell is fixedly connected to the upper outer ring of the third cylinder, the lower outer ring of the third cylinder is fixedly connected to the upper outer ring of the fourth cylinder, the lower outer ring of the fourth cylinder is fixedly connected to the upper outer ring of the lower elliptical head, a drain port is provided at the lower center position of the lower elliptical head, the drain port is provided with a lower convex drain pipe, and the lower elliptical head is supported on the skirt seat;

[0017] The two-stage diversion open channel includes an upper diversion open channel and a lower diversion open channel. The upper diversion open channel is arranged in the inner cavity of the first cylinder and is connected to an external first liquid inlet. A downcomer assembly is arranged below the upper diversion open channel. A lower diversion open channel is provided at the bottom of the lower end output of the downcomer assembly. The lower diversion open channel is arranged in the upper area of ​​the third cylinder. The lower diversion open channel is externally connected to an exposed feed inlet. A trough-type liquid distributor is provided below the lower diversion open channel. A packing pressure plate is provided below the trough-type liquid distributor. The packing is located in the height area between the packing pressure plate and the packing support. The packing pressure plate and the packing support are fixedly arranged.

[0018] The double-row blade type gas distributor is arranged in the fourth cylinder, and its feed port is externally connected to the gas feed port, and the packing support is located above the double-row blade type gas distributor.

[0019] It is further characterized by:

[0020] An anti-vortex baffle is provided above the drain port;

[0021] A number of lifting parts are arranged around the cylinder sections of the first cylinder and the second cylinder, and the lifting parts are used to lift the entire evaporator to ensure convenient and fast transportation;

[0022] A manhole is arranged at the front end of the integral cylinder composed of the first cylinder, the second cylinder, the cone shell, the third cylinder and the fourth cylinder from top to bottom. The manhole is provided with a flange cover and a hanging column. The manhole is opened through the hanging column to enter the interior of the tower for maintenance activities.

[0023] After adopting the present invention, a double-row blade-type gas distributor is set at the raw gas inlet. The gas material enters the tower radially. There are two rows of guide arc-shaped blades on both sides of the inlet. The top and bottom are closed. The airflow is separated left and right along the two rows of blades, rushes to the tower wall and turns upward. It first distributes the radial gas in the horizontal direction, and then uses the effect of the tower wall to make the horizontally separated gas turn and flow upward. The double-row blade-type gas distributor has excellent gas uniformity performance, and its low position in the tower allows the gas to be distributed horizontally, avoiding disturbance of the tower liquid and making the tower liquid level relatively stable during operation. Acetic acid flows from a higher point into the lower diversion channel through the downcomer. The lower diversion channel allows the incoming liquid to enter the tower plate evenly and at a constant speed, thereby improving work efficiency. The trough-type liquid distributor is a liquid distributor with excellent comprehensive performance. It makes the liquid evenly distributed, has a high density of spray points, and has an extremely low pressure drop. The equipment also adopts a cone-shell transition, which can effectively prevent the grading of catalyst particles along the axial direction. In summary, it makes the gas transportation stable and uniform, and the liquid distribution uniform and reliable, which ensures the uniform and reliable utilization of heat energy and the evaporation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0025] The names corresponding to the serial numbers in the figure are as follows:

[0026] Upper elliptical head 10, air outlet 11, first cylinder 20, first liquid inlet 21, second cylinder 30, conical shell 40, third cylinder 50, fourth cylinder 60, lower elliptical head 70, drain port 71, skirt 80, grounding plate structure 81, double-row blade gas distributor 90, gas feed port 91, packing support 100, packing 110, packing pressure plate 120, downcomer assembly 130, trough liquid distributor 140, lower convex drain pipe 150, upper diversion open channel 160, lower diversion open channel 170, feed port 171, anti-vortex baffle 180, lifting part 190, manhole 200. DETAILED DESCRIPTION

[0027] Acetic acid evaporator, see Figure 1 , which includes an upper elliptical head 10, a first cylinder 20, a second cylinder 30, a conical shell 40, a third cylinder 50, a fourth cylinder 60, a lower elliptical head 70, a skirt 80, a double-row blade type gas distributor 90, a packing assembly, and a liquid acetic acid distribution group;

[0028] The packing assembly includes a packing support 100, a packing 110, and a packing pressure plate 120; the liquid acetic acid distribution assembly includes a downcomer assembly 130, a two-stage diversion channel, and a trough-type liquid distributor 140;

[0029] An air outlet 11 is provided at the top center of the upper elliptical head 10. The lower outer ring surface of the upper elliptical head 10 is fixedly connected to the upper outer ring of the first cylinder 20. The lower outer ring of the first cylinder 20 is fixedly connected to the lower outer ring of the second cylinder 30. The lower outer ring of the second cylinder 30 is fixedly connected to the upper small-diameter cylinder of the cone shell 40. The lower large-diameter cylinder of the cone shell 40 is fixedly connected to the upper outer ring of the third cylinder 50. The lower outer ring of the third cylinder 50 is fixedly connected to the upper outer ring of the fourth cylinder 60. The lower outer ring of the fourth cylinder 60 is fixedly connected to the upper outer ring of the lower elliptical head 70. A drainage port 71 is provided at the lower center of the lower elliptical head 70. The drainage port 71 is provided with a lower convex drainage pipe 150. The lower elliptical head 70 is supported on the skirt 80. In specific implementation, the lower convex drainage pipe 150 is a bent pipe. The height of the skirt 80 ensures operation and use, and the bottom ring of the skirt 80 is provided with a grounding plate structure 81 to ensure stable and reliable support.

[0030] The two-stage diversion open channel includes an upper diversion open channel 160 and a lower diversion open channel 170. The upper diversion open channel 160 is arranged in the inner cavity of the first cylinder 20 and is connected to the external first liquid inlet 21. A downcomer assembly 130 is arranged below the upper diversion open channel 160. The lower diversion open channel 170 is provided at the bottom of the lower end output of the downcomer assembly 130. The lower diversion open channel 170 is arranged in the upper area of ​​the third cylinder 50. The lower diversion open channel 170 is externally connected to an exposed feed inlet 171. A trough-type liquid distributor 140 is provided below the lower diversion open channel 170. A packing pressure plate 120 is provided below the trough-type liquid distributor 140. The packing 110 is located in the height area between the packing pressure plate 120 and the packing support 100. The packing pressure plate 120 and the packing support 100 are fixed in position.

[0031] The double-row blade-type gas distributor 90 is disposed in the fourth cylinder 60 , and its feed port is externally connected to the gas feed port 91 . The packing support 100 is located above the double-row blade-type gas distributor 90 .

[0032] During specific implementation, both ends of the upper diversion open channel 160 , the lower diversion open channel 170 , and the double-row blade-type gas distributor 90 are supported by welding brackets to ensure quick and convenient assembly.

[0033] During specific implementation: an anti-vortex baffle 180 is provided above the drain port 71; a number of hoisting parts 190 are arranged around the cylinder sections of the first cylinder 20 and the second cylinder 30, and the hoisting parts 190 are used to hoist the entire evaporator to ensure convenient and quick transportation; a manhole 200 is arranged on the front end surface of the integral cylinder composed of the first cylinder 20, the second cylinder 30, the cone shell 40, the third cylinder 50, and the fourth cylinder 60 from top to bottom, and a flange cover and a hanging column are provided at the manhole 200, and the manhole is opened through the hanging column to enter the interior of the tower for maintenance activities.

[0034] Its working principle is as follows: a double-row blade gas distributor is set at the raw gas inlet. The gas material enters the tower radially. There are two rows of guide arc blades on both sides of the inlet. The top and bottom are closed. The airflow is separated left and right along the two rows of blades, rushes to the tower wall and turns upward. It first distributes the radial gas horizontally, and then uses the effect of the tower wall to make the horizontally separated gas turn and flow upward. The double-row blade gas distributor has excellent gas uniformity performance. It occupies a low position in the tower. The gas is distributed horizontally, avoiding disturbance of the tower liquid and making the tower liquid level relatively stable during operation. Acetic acid flows from a higher point into the lower diversion channel through the downcomer. The lower diversion channel allows the incoming liquid to enter the tower plate evenly and at a constant speed, thereby improving work efficiency. The trough-type liquid distributor is a liquid distributor with excellent comprehensive performance. It makes the liquid evenly distributed, has a high density of spray points, and has an extremely low pressure drop. The equipment also adopts a cone-shell transition, which can effectively prevent the grading of catalyst particles along the axial direction. In summary, it makes the gas transportation stable and uniform, and the liquid distribution uniform and reliable, which ensures the uniform and reliable utilization of heat energy and the evaporation effect.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0036] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Acetic acid evaporator, characterized in that, It includes: Upper elliptical head; a first cylinder; a second cylinder; cone shell; The third cylinder; fourth cylinder; Lower elliptical head; Skirt seat; Double-row blade type gas distributor; A packing assembly, comprising a packing support, a packing, and a packing pressure plate; A liquid acetic acid distribution assembly, comprising a downcomer assembly, a two-stage diversion channel, and a trough-type liquid distributor; An air outlet is provided at the top center position of the upper elliptical head, the lower outer ring surface of the upper elliptical head is fixedly connected to the upper outer ring of the first cylinder, the lower outer ring of the first cylinder is fixedly connected to the lower outer ring of the second cylinder, the lower outer ring of the second cylinder is fixedly connected to the upper small-diameter cylinder of the conical shell, the lower large-diameter cylinder of the conical shell is fixedly connected to the upper outer ring of the third cylinder, the lower outer ring of the third cylinder is fixedly connected to the upper outer ring of the fourth cylinder, the lower outer ring of the fourth cylinder is fixedly connected to the upper outer ring of the lower elliptical head, a drain port is provided at the lower center position of the lower elliptical head, the drain port is provided with a lower convex drain pipe, and the lower elliptical head is supported on the skirt seat; The two-stage diversion open channel includes an upper diversion open channel and a lower diversion open channel. The upper diversion open channel is arranged in the inner cavity of the first cylinder and is connected to an external first liquid inlet. A downcomer assembly is arranged below the upper diversion open channel. A lower diversion open channel is provided at the bottom of the lower end output of the downcomer assembly. The lower diversion open channel is arranged in the upper area of ​​the third cylinder. The lower diversion open channel is externally connected to an exposed feed inlet. A trough-type liquid distributor is provided below the lower diversion open channel. A packing pressure plate is provided below the trough-type liquid distributor. The packing is located in the height area between the packing pressure plate and the packing support. The packing pressure plate and the packing support are fixedly arranged. The double-row blade type gas distributor is arranged in the fourth cylinder, and its feed port is externally connected to the gas feed port, and the packing support is located above the double-row blade type gas distributor; An anti-vortex baffle is provided above the drain port; A plurality of hanging parts are arranged around the cylinder sections of the first cylinder and the second cylinder, and the hanging parts are used to hang the entire evaporator.

2. The acetic acid evaporator according to claim 1, wherein: A manhole is arranged on the front end surface of the integral cylinder composed of the first cylinder, the second cylinder, the cone shell, the third cylinder and the fourth cylinder from top to bottom.

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