CN104773778B - Horizontal rotary paddle evaporator - Google Patents

Abstract

A horizontal rotary paddle evaporator, including a shell, a hollow shaft and multiple paddles connected to the hollow shaft, sends water vapor into the transmission shaft and jacket during operation, and heats the solution through the inner wall of the dryer and the paddles , the water in the solution is evaporated, multiple propulsion guide plates are set on the top of the paddle, and a scraper is set between the two paddles. The blades are all welded on the blade seat and communicate with the hollow shaft. On the left and right planes of the blade seat, there are sealing grooves for installing the blade sealing ring and a plurality of holes connected with the transmission rod. Through the transmission rod and the round nut and the hollow shaft The paddle sealing ring is used to realize the sealing between the paddles. The horizontal rotary paddle evaporator of the present invention has a large evaporation capacity of a single device, a small installed capacity, good heat transfer performance, low operating cost, and no knots on the heat exchange surface. Scale phenomenon, without chemical cleaning, without any secondary pollution.

Description

Horizontal rotary paddle evaporator

technical field

The invention belongs to an evaporator, which is especially used for evaporating salty waste water in chemical production.

Background technique

At present, in order to prevent the fouling of waste water on the heat exchange surface, the evaporators used for salty wastewater in chemical production usually use forced circulation evaporators and scraper evaporators; forced circulation evaporators need to be equipped with high-power circulation pumps, which exist Defects such as high power consumption, easy wear of pump blades, and long pipelines are easy to block; the scraper blade of the scraper evaporator rotates at a high speed, and for salty wastewater with crystallization, the scraper blade wears a lot and the equipment cannot operate normally; and The new type of evaporation concentrator (ZL201210285407.4) adopts the rotary motion of the heat exchange tube bundle, so that the outer tube and the waste water to be evaporated have a certain relative speed, and the fouling phenomenon is greatly reduced, but the side of the tube bundle in the rotary motion is opposite to the liquid The speed is high, due to the small distance between the tube bundles and the constant rotation speed, a certain amount of liquid is attached to the front and back of the tube bundle, the relative speed between the heat exchange surface and the liquid is small, the heat transfer performance is poor, and a certain amount of scaling will occur, so After a period of time, chemical cleaning is required, resulting in secondary pollution.

Contents of the invention

Technical problem: The present invention provides a horizontal rotary paddle evaporator with high heat transfer coefficient, high evaporation intensity, low equipment manufacturing cost, no fouling phenomenon, no secondary pollution, and used for saline wastewater.

Technical solution: The horizontal rotary paddle evaporator of the present invention includes a hollow shaft arranged in the casing, a scraper and a plurality of annular paddles arranged on the hollow shaft, and a plurality of propelling paddles are arranged on the top plate of the annular paddles. A guide plate, the scraper is fixed on the inner wall of the casing and arranged in the gap between two adjacent annular paddles. The annular blade is a hollow structure composed of a blade seat, two side plates installed on the blade seat and an annular top plate located on the outer edge. Inside the blade, there are reinforcing ribs and partitions installed on the side plates. plate and a water collecting plate, one end of the partition is connected to the top plate, the other end is connected to the paddle seat, and one end of the water collecting plate is connected to the paddle seat; in the hollow shaft, corresponding to each annular blade is provided There are paddle steam inlet and drain pipes, and the openings at both ends of the paddle steam inlet and drain pipes pass through the pipe wall of the hollow shaft and communicate with the inside of the paddle through the openings on the paddle seat. There is an intermediate blocking plate in the middle of the steam inlet and discharge pipes of the blades, which divides the steam inlet and discharge pipes of the blades into two separate pipe sections. And on the pipe wall adjacent to the middle blocking plate, there is a paddle discharge port connected with the hollow shaft; on the other pipe section of the paddle steam inlet and discharge pipe, there is a water outlet connected to the hollow shaft on the pipe wall adjacent to the middle blocking plate. Propeller air inlet.

In a preferred solution of the present invention, the paddle outlet is arranged perpendicular to the hollow shaft, and the paddle steam inlet is arranged parallel to the hollow shaft and facing away from the steam flow direction.

In the preferred solution of the present invention, the blade seats of the annular blades are sequentially set on the hollow shaft, the side of the blade seat is provided with a sealing groove and a plurality of installation holes, and the hollow shaft plug at the end is provided with corresponding installation holes. The top blade seat and the hollow shaft plug are fixedly connected by the transmission rod set in the installation hole, and the blade sealing ring is installed in the sealing groove between two adjacent blade seats to realize the sealing between the annular blades, and the two-phase The mounting holes on the adjacent paddle seat are corresponding, and are fixedly connected by the transmission rod arranged therein.

In a preferred solution of the present invention, one end of the hollow shaft is connected to the motor reducer, and the other end is connected to the fixed rotary joint of the inner tube.

In a preferred solution of the present invention, an inlet for a dilute solution is provided above the housing, and an outlet for a concentrated solution is provided below.

In the horizontal rotary paddle evaporator of the present invention, the waste water to be evaporated is outside the heat exchange surface, and the heat source is inside the heat exchange surface, so there is no need to use a high-power forced circulation pump to solve the scaling problem on the heat exchange surface; the difference is that To solve the problem of fouling and heat transfer difference between the front and back of the heat exchange tube bundle that may occur when the tube bundle is rotated (patent ZL201210285407.4), the present invention uses a set of vertical annular paddles as the heat exchange surface of the evaporator, and the heat source is placed on the paddle Internally, the waste water evaporates outside the paddle, and the rotational movement of the circular paddle makes the paddle and the waste water have a certain relative speed anywhere, and the heat transfer performance is improved. In addition, between the two vertical circular paddles, There is also a scraper, which greatly improves the descaling performance, and rotates once, and the scraper strongly disturbs the heat exchange surface once, which greatly improves the heat transfer coefficient. Generally speaking, if the annular blades are connected to the hollow shaft by welding, the distance between the blades is large, and the heat exchange area that can be set per unit volume is smaller than the area of the patent ZL201210285407.4 tube bundle, and the unit capacity of the equipment is large and the manufacturing cost is high. For this reason, according to the characteristic that the liquid has less rotational resistance to the annular blade, the connection between the annular blade and the hollow shaft of the present invention adopts a transmission rod and a round nut connection method, which can greatly reduce the distance between the blades, and the heat exchange rate that can be set in a unit volume The area can reach the tube bundle area of the patent ZL201210285407.4, and the sealing material can be added in the sealing groove on the blade seat to realize the sealing between the annular blade and the hollow shaft.

Beneficial effect: compared with the prior art, the present invention has the following advantages:

1. The forced circulation evaporator adopts tube evaporation, the heat source is outside the tube, and the evaporated wastewater is inside the tube. In order to prevent the wastewater from scaling in the tube, the wastewater needs a certain flow rate. Usually, a high-power circulation pump is installed, and the forced circulation evaporator In contrast, the present invention does not require a forced circulation pump, and can completely solve the fouling problem. Therefore, the installed capacity is small, the operating cost is low, and there are no defects such as easy wear of pump blades and long pipelines that are easy to block;

2. In the scraper evaporator, the heat source is set on the outer jacket of the shell, and the evaporated wastewater is arranged on the inner wall of the evaporator shell by high-speed centrifugal force to form a thin film. The scraper blade of the scraper evaporator rotates at a high speed, For salty waste water with crystallization, the scraper wears a lot. Compared with the scraper evaporator, the rotation speed of the present invention is greatly reduced, only 1/10---1/20 of the scraper evaporator, and there is no wear problem. At the same time, The scraper evaporator only has the outer wall as the heat exchange surface, and the heat exchange surface of a single unit is extremely small, generally up to 100m ² , which cannot be used for a large amount of wastewater treatment, but the heat exchange surface of a single unit of the present invention can reach 800m ² .

3. The new type of evaporation concentrator (ZL201210285407.4) also adopts tube evaporation, but the heat source is inside the tube, and the evaporated wastewater is outside the tube. The rotating motion of the heat exchange tube bundle is used to make the outer tube and the wastewater to be evaporated have a certain distance. Relative speed to reduce fouling phenomenon. Compared with it, the present invention adopts a set of vertical annular paddles as the heat exchange surface of the evaporator, and a scraper is arranged between the two vertical annular paddles, and the descaling performance is improved. Improvement, there is no waste liquid produced by chemical cleaning, and heat transfer is also enhanced. In addition, the invention designs the connection method between the annular blade and the hollow shaft, which greatly reduces the distance between the blades. .4 is equivalent, which makes up the deficiency that the vertical annular paddle of the present invention is used as the heat exchange surface area of the evaporator is small.

Description of drawings

Fig. 1 is a schematic diagram of the system of the present invention.

Fig. 2 is a schematic diagram of the structure of the hollow shaft and the paddle of the present invention.

Fig. 3 is a schematic diagram of the internal structure of the blade of the present invention.

Fig. 4 is a schematic diagram of the structure of the air intake and discharge pipe of the blade, Fig. 4a is the front view (projected from the right direction of Fig. 4b), and Fig. 4b is the left view.

Fig. 5 is a schematic diagram of transmission connection between blade seats, Fig. 5a is a front view, and Fig. 5b is a cross-sectional view of Fig. 5a (projected from the left direction arrow in Fig. 5a).

In the figure: 1 motor reducer, 2 hollow shaft, 3 annular paddle, 4 dilute solution inlet, 5 scraper, 6 steam exhaust port, 7 packing seal, 8 steam inlet, 9 drain port, 10 concentrated solution outlet, 11 jacket drain port, 12 jacket, 13 jacket steam inlet, 14 hollow shaft plug, 15 paddle steam inlet and drain pipe, 16 transmission rod, 17 propulsion guide plate, 18 paddle sealing ring, 19 paddle root seal Ring, 20 Gland, 21 Round Nut, 22 Right Joint of Hollow Shaft, 23 Fixed Rotary Joint of Inner Pipe, 24 Siphon Elbow, 25 Reinforcing Rib, 26 Separator, 27 Water Collecting Plate, 28 Blade Seat, 29 Blade Drainage Mouth, 30 paddle steam inlet and drain pipe middle blocking plate, 31 paddle steam inlet, 32 steam compressor, 33 side plate, 34 top plate, 35 shell.

detailed description

The present invention will be further described below in conjunction with embodiment and accompanying drawing.

Example 1

A horizontal rotary paddle evaporator is composed of a casing 35, a hollow shaft 2 and a plurality of annular paddles 3 connected to the hollow shaft 2, the hollow shaft 2 is placed horizontally, and each annular paddle is driven by the hollow shaft 2 Rotational movement, a scraper 5 is set between the two annular paddles 3, the scraper is fixed on the shell 35, a plurality of propulsion guide plates 17 are arranged on the top of the annular paddle 3, the hollow shaft 2 is connected with the hollow shaft plug 14, and the hollow shaft plug 14 It is connected with the motor reducer 1, and the other end of the hollow shaft 2 is connected with the fixed rotary joint 23 of the inner tube. The rotary joint 23 is provided with a steam inlet 8 and a condensation drain 9, and a dilute solution inlet 4 is provided above one end of the shell 35, and the other end is Concentrated solution outlet 10 is established below.

The annular paddle 3 connected on the hollow shaft 2 is composed of the left and right side plates 33, the top plate 34 and the paddle seat 28, and the reinforcing rib 25, the dividing plate 26 and the water collecting plate 27 are arranged inside. There are two holes between the plates 27 and the paddle seat 28 on the opposite side, which communicate with the paddle steam inlet and drain pipe 15 connected to the hollow shaft 2, and the paddle seal ring 18 is installed on the left and right planes of the paddle seat 28. The sealing groove and a plurality of holes connected with the transmission rod 16, the leftmost annular paddle 3 and the hollow shaft plug 14 are connected through the transmission rod 16, the rightmost annular paddle 3 is fixed with the hollow shaft 2 through the round nut 21, and the paddle The sealing ring 18 realizes the sealing between the annular paddles 3 to ensure that the water vapor in the hollow shaft 2 and the annular paddles 3 will not leak into the evaporated solution.

The paddle steam inlet and discharge pipe 15 is provided with a middle blocking plate 30 in the middle, and the top and bottom of the pipe close to the middle blocking plate 30 are respectively provided with a paddle discharge port 29 and a paddle steam inlet 31, and the paddle discharge port 29 is connected with the hollow The shaft 2 is vertical, and the paddle steam inlet 31 is parallel to the hollow shaft 2 and faces away from the direction of steam flow.

Example 2

It is sent into the evaporator from the inlet 4 of the dilute solution. In the evaporator, the solution is heated by the annular paddle 3 to be evaporated. The evaporated water vapor is discharged from the steam exhaust port 6 and enters the steam compressor 32. The water after boosting the pressure and temperature The steam is used as the heat source of the evaporator, and a part of it is sent into the jacket steam inlet 13 of the jacket 12 to heat the jacket 12, and the condensed water is discharged from the outlet 11 at the bottom of the jacket 12; the other part is passed through the rotary joint 23 The steam inlet 8 of the steam is sent into the hollow shaft 2, and enters each annular paddle 3 through the paddle steam inlet 31 to heat the dilute solution, and the concentrated solution (entrained with crystal salt) is discharged from the concentrated solution outlet 10, and one end of the hollow shaft 2 A shaft plug 14 (usually connected to the motor reducer 1) is provided, and the other end of the hollow shaft 2 is provided with a siphon elbow 24 and a condensed water outlet 9 to discharge the condensed water.

The steam compressor 32 is used to separate the dilute solution entering the evaporator into the concentrated solution discharged from the concentrated solution outlet 10 and the condensed water discharged from the water outlet 9 of the rotary joint 23 and the jacket water outlet 12, thereby realizing the evaporation and separation of the dilute solution. concentrate.

The concentrated solution discharged from the concentrated solution outlet 10 and the condensed water discharged from the outlet 9 of the rotary joint 23 and the outlet 12 of the jacket have a relatively high temperature, and the dilute solution at ambient temperature can be used for heat recovery to further improve thermal efficiency and reduce Operating costs.

The working process of the device of the present invention is as follows:

The hollow shaft 2 of the horizontal rotary paddle evaporator is driven by the motor reducer 1, and the dilute solution is sent into the evaporator from the dilute solution inlet 4. The evaporated water vapor is discharged from the steam exhaust port 6 and enters the steam compressor 32. The water vapor after boosting the pressure and temperature is used as the heat source of the evaporator, and a part of it is sent into the jacket steam inlet 13 of the jacket 12, and the jacket is heated. Heating, the condensed water is discharged from the outlet of the jacket; the other part is sent to the hollow shaft through the steam inlet 8 of the rotary joint 23, and enters each blade through the steam inlet 31 of the paddle to heat the dilute solution. When the blade blocking plate 26 is turned upward, the condensed water generated after the steam in the blade is cooled is discharged through the blade drain port 29; when the blade blocking plate 26 is turned downward, no condensed water is discharged from the blade drain port 29, Acts as the steam inlet for the paddle. The propulsion guide plate 17 arranged on the top of the annular paddle 3 pushes the crystallized salts in the solution forward, the concentrated solution (entrained with crystallized salt) is discharged from the concentrated solution outlet 10, and a shaft plug 14 is arranged at one end of the hollow shaft 2 (usually connected with the motor reducer 1), the other end of the hollow shaft 2 is provided with a siphon elbow 24 and a condensed water outlet 9 to discharge the condensed water. Between the two disk blades, a scraper 5 is provided to remove dirt or crystallized salt on the surface of the blades in time, and at the same time, disturb the fluid on the surface of the blades to enhance heat transfer.

The annular paddle 3 on the hollow shaft 2 is made up of left and right side plates 33, top plate 34 and paddle seat 28 airtight, and reinforcing rib 25, dividing plate 26 and water collecting plate 27 are arranged in the blade, between dividing plate 26 and water collecting plate There are two holes between the plates 27 and the paddle seat 28 on the opposite side, which communicate with the paddle steam inlet and drain pipe 15 connected to the hollow shaft 2, and the paddle seal ring 18 is installed on the left and right planes of the paddle seat 28. The sealing groove and a plurality of holes connected with the transmission rod 16, the leftmost annular paddle 3 and the hollow shaft plug 14 are connected through the transmission rod 16, the rightmost paddle 3 is fixed with the hollow shaft 2 through the round nut 21, and adopts the paddle seal The ring 18 realizes the sealing between the annular paddles 3; through the design of the transmission rod 16 and the seal 18, each annular paddle 3 is an independent component before being connected with the hollow shaft 2, that is, two side plates 33, a top plate 34, The paddle seat 28, the reinforcing rib 25, the dividing plate 26 and the water collecting plate 27 have been connected as a whole, so the distance between the paddles can be made very small (for example 70mm), but if the annular paddle 3 is directly welded on the hollow shaft 2. Due to the limitation of welding space, the distance between paddles is greater than 150mm, the number of paddles that can be set in a unit volume is more than doubled, the heat exchange area for evaporation is increased, and the evaporation capacity per unit volume and a single device is large.

A middle blocking plate 30 is arranged in the middle of the paddle steam inlet and discharge pipe 15, and a paddle discharge outlet 29 and a paddle steam inlet 31 are respectively arranged on the top and bottom of the pipe close to the middle blocking plate 30, and the paddle discharge outlet 29 and the hollow shaft 2 vertically, the paddle steam inlet 31 is parallel to the hollow shaft 2 and faces away from the steam flow direction. The drain outlet of the paddle is close to the center of the hollow shaft. Because the condensed water level in the hollow shaft will not reach the center of the shaft, the condensed water in the hollow shaft will not flow back into the paddle, and the water flowing out of the paddle will not appear directly. Into the paddle air inlet back to the paddle.

The horizontal rotary paddle evaporator of the present invention has high rigidity and strength of the hollow shaft, small installed capacity, low operating cost, no fouling on the heat exchange surface, good heat transfer performance, and large evaporation capacity of a single device.

The foregoing embodiments are only preferred implementations of the present invention. It should be pointed out that those skilled in the art can make several improvements and equivalent replacements without departing from the principle of the present invention. Technical solutions requiring improvement and equivalent replacement all fall within the protection scope of the present invention.

Claims (4)

1. a horizontal rotary blade vaporizer, it is characterized in that, hollow axle (2) that this vaporizer includes being arranged in shell (35), scraper plate (5) and multiple annulars blade (3) being arranged on described hollow axle (2), arranging multiple propelling guide plate (17) on the top board (34) of annular blade (3), described scraper plate (5) is fixed on shell (35) inwall and is arranged in the space between two adjacent annular blades (3)；

Described annular blade (3) is by blade seat (28), two side plates (33) being arranged on blade seat (28) and the airtight hollow-core construction formed of top board (34) being positioned at outer peripheral annular, the reinforcement (25), dividing plate (26) and the water collection sheet (27) that are arranged on side plate (33) it is internally provided with at blade (3), described dividing plate (26) one end is connected with top board (34), the other end is connected with blade seat (28), and described water collection sheet (27) one end is connected with blade seat (28)；In hollow axle (2), being provided with blade with each annular blade (3) corresponding position and enter vapour drain pipe (15), described blade enters the both ends open of vapour drain pipe (15) and both passes through the tube wall of hollow axle (2) and connect by the opening on blade seat (28) and blade (3) are internal；

Described blade enters vapour drain pipe (15) middle and is provided with middle closure plate (30), blade is entered vapour drain pipe (15) and is divided into two pipeline sections being isolated from each other, on the open-ended tube wall being positioned between dividing plate (26) and water collection sheet (27) of one of them pipeline section, and it is provided with, on the tube wall closing on middle closure plate (30), the impeller discharge mouth of a river (29) connected with hollow axle (2)；Blade enters on another pipeline section of vapour drain pipe (15), is provided with, on the tube wall closing on middle closure plate (30), the blade air intake (31) connected with hollow axle (2)；

The described impeller discharge mouth of a river (29) and hollow axle (2) are vertically arranged, and blade air intake (31) is parallel with hollow axle (2) and arranges back to steam flow.

2. horizontal rotary blade vaporizer according to claim 1, it is characterized in that, the blade seat (28) of described annular blade (3) is sequentially sleeved on hollow axle (2), blade seat (28) side is provided with seal groove and multiple installing hole, the hollow axle plug (14) of end is provided with the installing hole of correspondence, top blade seat (28) and hollow axle plug (14) are connected by the driving rod (16) that is arranged in installing hole is fixing, seal groove between two adjacent blades seats (28) is provided with blade sealing ring (18), realize the sealing between annular blade (3), installing hole on two adjacent blades seats (28) is corresponding, and the fixing connection of driving rod (16) by being disposed therein.

3. horizontal rotary blade vaporizer according to claim 1, it is characterised in that described hollow axle (2) one end is connected with motor reducer (1), the other end is connected with the fixing swivel joint (23) of interior pipe.

4. horizontal rotary blade vaporizer according to claim 1, it is characterised in that described shell (35) is arranged over weak solution entrance (4), is connected with concentrated solution outlet (10).