CN213433009U

CN213433009U - Anti-scaling evaporation concentration system with directional particle circulation

Info

Publication number: CN213433009U
Application number: CN202022030271.5U
Authority: CN
Inventors: 马啸阳; 韩志刚; 刘昱彤; 刘滨华; 钟子怡
Original assignee: Tianjin Tianda Qingneng Environmental Engineering Co ltd
Current assignee: Tianjin Tianda Qingneng Environmental Engineering Co ltd
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-06-15
Anticipated expiration: 2030-09-16

Abstract

The utility model relates to a directional granule endless prevents scale deposit evaporation concentration system, include: the device comprises a steam outlet, a steam-liquid separator, an evaporating pot, a guide cylinder, a baffle plate, a discharge pipe, a jet regulating valve, a particle circulating pipe, a one-way valve, a shell and tube heat exchanger, a particle regulating valve, a first mixer, a mixture, a mixed flow pipe, a gravity settling pipe, a regulating valve, a feed inlet, a discharge outlet, a solution circulating pipe, a discharge pipe, a second mixer and a forced circulation pump. The utility model discloses realize fundamentally and solve the difficult problem of evaporative concentration device scale deposit, and then reach the evaporative concentration device operation in-process not scale deposit, the non-staining is stifled, avoided the phenomenon of traditional fluidized bed heat exchanger granule cloth uneven and, the local long-pending material of granule simultaneously.

Description

Anti-scaling evaporation concentration system with directional particle circulation

Technical Field

The utility model relates to a chemical industry equipment field, concretely relates to directional granule circulation prevent scale deposit evaporative concentration system.

Background

In the chemical field of China and the like, evaporation and concentration equipment is used as common equipment and is very widely applied. The scale formation problem of the heat exchanger is the most difficult problem in the field of evaporation concentration in China at present, and as the aqueous solution to be evaporated contains calcium ions, magnesium ions, silicon ions and the like, calcium sulfate, calcium carbonate, insoluble silicon compounds and the like are easily formed on the surface of a heater, a pipeline and other parts during the operation of evaporation concentration equipment, and the formed scales further reduce the heat exchange efficiency of the evaporation concentration equipment, block the heater, the pipeline and the like, so that the series of problems of low equipment operation efficiency, blockage, high equipment shutdown maintenance frequency and the like are caused, and the loss to industrial production and the like is extremely large.

In order to avoid the scaling of a heat exchanger, deep research is carried out in the field of fluidized bed heat exchangers at home and abroad, and the fluidized bed heat exchanger has a remarkable effect in the aspect of preventing the scaling of the heat exchanger, but the conventional fluidized bed heat exchanger has the problems of uneven fluidized particles, local particle accumulation, and correspondingly reduced fluidization efficiency once the flow of heat exchange fluid fluctuates, so that the problems of high difficulty in controlling the fluidized particles and the like exist in the operation process, and the large-scale application of the fluidized bed heat exchanger is hindered.

Disclosure of Invention

An object of the utility model is to provide a directional granule endless prevents scale deposit evaporative concentration system realizes fundamentally and solves the evaporative concentration device scale deposit difficult problem, and then reaches the purpose that the evaporative concentration device operation in-process does not scale deposit, the non-staining is stifled, the operation is stable, easily adjusts.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

an anti-fouling evaporative concentration system with directional particle circulation, comprising: the device comprises a steam outlet 1, a steam-liquid separator 2, an evaporating pot 3, a guide cylinder 4, a baffle plate 5, a discharge pipe 6, a jet pipe 7, a jet regulating valve 8, a particle circulating pipe 9, a one-way valve 10, a tubular heat exchanger 11, a particle regulating valve 12, a first mixer 13, a mixture 14, a mixed flow pipe 15, a gravity settling pipe 16, a regulating valve 17, a feed inlet 18, a discharge outlet 19, a solution circulating pipe 20, a discharge pipe 21, a second mixer 22 and a forced circulating pump 23;

the steam outlet 1 is arranged at the top of the evaporation tank 3, the upper part of the evaporation tank 3, which is close to the steam outlet 1, is connected with the steam-liquid separator 2, the bottom of the evaporation tank 3 is connected with the upper port of the particle circulation pipe 9 and the upper ports of the branch pipes of the jet pipe 7, each branch pipe of the jet pipe 7 is connected with a one-way valve 10, the lower port of each branch pipe of the jet pipe 7 is connected with the inlet of the jet regulating valve 8 through a pipeline, and the outlet of the jet regulating valve 8 is connected with the upper part of the side wall of the gravity settling pipe 16 through a connected pipeline;

the upper end of the tubular heat exchanger 11 extends into the inner part of the evaporation tank 3 and is provided with a guide cylinder 4, the tube side of the tubular heat exchanger 11 is a metal round tube, steam is introduced into the shell side of the tubular heat exchanger, fluid flowing upwards through the tube side is introduced into the shell side of the tubular heat exchanger, the lower part of a tube bundle space at the bottom of the tubular heat exchanger 11 is connected with a conical structure, the side wall at the bottom of the conical structure is connected with a first mixer 13 through a pipeline, an inlet at the upper end of the first mixer 13 is connected with a lower port of a particle circulating tube 9, and the pipeline of; the first mixer 13 is connected with a mixed flow pipe 15, the outlet of the first mixer 13 is connected with the bottom end of a conical body connected with the bottom of the tubular heat exchanger 11, and the solution of mixed particles enters the bottom space; the lower part of the bottom conical body structure of the tubular heat exchanger 11 is connected with the top port of the mixture 14, the upper part of the mixture 14 is cylindrical, and the lower part is conical;

an opening of the upper side wall of the gravity settling tube 16 is connected with a tube opening of a solution circulating tube 20, a feed inlet 18 and a discharge outlet 19 are connected to the solution circulating tube 20, the bottom of the solution circulating tube 20 is connected with an inlet of a forced circulation pump 23, an outlet of the forced circulation pump 23 is connected with an inlet of a second mixer 22, and an outlet solution of the second mixer 22 is connected with an inlet at the bottom of a conical body at the lower part of the mixture 14; the bottom conical part of the gravity settling tube 16 is connected with a discharging tube 21, the pipeline of the discharging tube 21 is connected with an adjusting valve 17, and the bottom of the discharging tube 21 is connected with an inlet at the top end of a second mixer 22; one end of the discharge pipe 6 is connected with the side wall of the evaporation tank 3, the inside of the evaporation tank 3 extends and is connected with a baffle plate 5 with an upward opening, and the discharge pipe 6 extends to the bottom of the gravity settling tube 16.

The utility model has the advantages that:

1. specific inert solid particles which can resist acid and alkali corrosion are added into an evaporation concentration device to form mixed flow of the inert solid particles and a material solution in a heater of the evaporation concentration device, so that a multi-phase fluidized state of a solid phase, a vapor phase and a liquid phase is formed, the material solution containing the inert solid particles forms a comprehensive effect of boiling, impacting, disturbing and rubbing contact with a wall surface in a heating pipe, the critical state of scaling on the wall surface of the heating pipe of the tube array is damaged, the attachment of scaling substances is prevented, the cleanness of the wall surface of the heating pipe is kept, and the purposes of scaling prevention and heat transfer enhancement are achieved.

2. Through the research to the behavior of current fluidized bed heat exchanger, discover at heat exchanger bottom fluidization space, all have the granule misce bene, have the dead angle of long-pending material, lead to the granule to mix inhomogeneous, the phenomenon of stifled pipe is concentrated to local granule appears even, the utility model discloses a design granule mixed flow pipe, form the solution main fluid upwards fluidize, granule and the disturbance state of drawing the horizontal mixed flow of injection fluid, the granule is at fluidization space misce bene, does not have long-pending material dead angle, has solved the defect of current fluidized bed heat exchanger design, has avoided the granule effectively to flow back, the local long-pending material of granule, the double-phase inhomogeneous, the big problem of the control degree of difficulty.

3. The jet pipe is designed, and the disturbance and the local fluidization of particles at the bottom of the evaporation tank are realized through the pulse jet flow at the outlet of the jet pipe, so that the occurrence of local particle blockage is avoided.

4. Through the design of the gravity settling tube, a small amount of escaping particles are subjected to gravity separation and secondary recovery, so that the particle recovery rate is improved.

Drawings

Fig. 1 is a schematic diagram of the structure and process principle of an anti-scaling evaporation concentration system with directional particle circulation according to an embodiment of the present invention.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides an anti-scaling evaporation concentration system with directional particle circulation, including: the device comprises a steam outlet 1, a steam-liquid separator 2, an evaporating pot 3, a guide cylinder 4, a baffle plate 5, a discharge pipe 6, a jet pipe 7, a jet regulating valve 8, a particle circulating pipe 9, a one-way valve 10, a tubular heat exchanger 11, a particle regulating valve 12, a first mixer 13, a mixture 14, a mixed flow pipe 15, a gravity settling pipe 16, a regulating valve 17, a feeding hole 18, a discharging hole 19, a solution circulating pipe 20, a discharging pipe 21, a second mixer 22 and a forced circulating pump 23.

Steam outlet 1 sets up the top at evaporating pot 3, the upper portion of evaporating pot 3 is close to 1 department of steam outlet and connects vapour and liquid separator 2, and the bottom of evaporating pot 3 is connected with upper port of granule circulating pipe 9 upper port, the last port of each bleeder of efflux pipe 7, all is connected with check valve 10 on every bleeder of efflux pipe 7, and the lower port of each bleeder of efflux pipe 7 passes through the pipeline and is connected with the entry linkage of efflux governing valve 8, and the export of efflux governing valve 8 is connected with the lateral wall upper portion of gravity settling tube 16 through the pipeline of connecting.

The upper end of the tubular heat exchanger 11 extends into the inner part of the evaporation tank 3 and is provided with a guide cylinder 4, the tube side of the tubular heat exchanger 11 is a metal round tube, steam is introduced into the shell side of the tubular heat exchanger, fluid flowing upwards through the tube side is introduced into the shell side of the tubular heat exchanger, the lower part of a tube bundle space at the bottom of the tubular heat exchanger 11 is connected with a conical structure, the side wall at the bottom of the conical structure is connected with a first mixer 13 through a pipeline, an inlet at the upper end of the first mixer 13 is connected with a lower port of a particle circulating tube 9, and the pipeline of; the first mixer 13 is connected with a mixed flow pipe 15, the outlet of the first mixer 13 is connected with the bottom end of a conical body connected with the bottom of the tubular heat exchanger 11, and the solution of mixed particles enters the bottom space; the lower part of the bottom conical body structure of the tubular heat exchanger 11 is connected with the top port of the mixture 14, the upper part of the mixture 14 is cylindrical, and the lower part is conical.

The following description specifically describes each component:

1. a steam outlet 1:

and the steam is connected with a steam discharging pipeline of the evaporating pot 3.

2. An evaporation tank 3:

the material of the evaporation tank can be carbon steel, 304 type stainless steel, 316L stainless steel or titanium material, the tank body is of a cylindrical structure, the heated material solution realizes evaporation separation of material and water in the evaporation tank, a vapor-liquid separator 2 is arranged between the upper end of the evaporation tank and the steam outlet 1, the steam realizes vapor-liquid separation through the vapor-liquid separator 2, and the evaporation tank 3 can operate in a negative pressure, normal pressure or positive pressure evaporation state.

3. A vapor-liquid separator 2:

the liquid drop mist with the diameter more than or equal to 3-5 um in the steam can be removed by adopting the wire mesh demister, the liquid trapping efficiency reaches 98-99.8 percent, and the pressure drop loss of the steam passing through the demister is between 250-500 Pa.

4. Tubular heat exchanger 11:

the tubular heat exchanger mainly comprises a shell, a tube plate, a heat exchange tube, a seal head, a baffling baffle and the like. When heat exchange is carried out, materials enter from the connecting pipe of the end socket and flow in the pipe, and flow out from the outlet pipe at the other end of the end socket, which is called a pipe pass; the other fluid enters from a connecting pipe of the shell and flows out from the other connecting pipe on the shell, and the other fluid is called shell side. The technology is mature, the industrial application is wide, and particles enter from a tube side during operation to form a multiphase flow operation state in the tube side.

5. Particle circulation pipe 9:

the particle circulating pipe 9 can be a single or a plurality of vertical round pipes or special pipes, is used as a particle descending channel and is connected with an opening of an upper pipe plate of the top pipe orifice shell and tube heat exchanger, and the bottom of the particle circulating pipe is connected with the mixer through a connecting valve.

6. Forced circulation pump 23

The axial flow pump or the mixed flow pump is adopted, the flow passage of the forced circulation pump 23 can be made of stainless steel 304, stainless steel 316L, titanium materials and the like according to materials, and the circulation pump plays a role in increasing the fluid circulation speed.

7. Particle regulating valve 12

The flow-through piece can be made of stainless steel 304, stainless steel 316L, titanium materials and the like according to materials, and plays a role in adjusting the flow of descending particles.

8. And (3) a jet pipe 7:

the branch pipes of the jet pipe 7 are connected with the bottom opening of the tubular heat exchanger 11, each branch pipe is provided with a one-way valve X, the one-way valves X play a role of blocking particles from entering the branch pipes, and the fluid upwards forms a certain amount of fluid through the branch pipes to form a certain disturbance in the particle storage area 25, so that the local accumulation phenomenon of the particles is avoided, and the particles can be ensured to completely flow back into the particle circulating pipe 9.

9. A mixed flow pipe 15:

the mixed flow pipe 15 adopts a corrosion-resistant metal pipe, the mixed flow pipe 15 has the function of forming injection fluid and uniformly mixing solid and liquid in the first mixer 13, a pipe orifice fluid outlet of the mixed flow pipe 15 extends into the first mixer 13, the pipe orifice position is positioned in front of a connecting port of the particle circulating pipe 9 and the first mixer 13, the first mixer 13 is of a middle cylinder and two-end semi-cone structure, under the jet flow effect of the mixed flow pipe 15, particles and fluid from the particle circulating pipe 9 are quickly brought into a bottom space area of the column pipe heat exchanger 11, so that the possibility that the particles flow back upwards along the particle circulating pipe 9 is avoided, and meanwhile, the particles and the bottom space of the column pipe heat exchanger 11 are uniformly fluidized to form a disturbed mixing area, thereby thoroughly avoiding the possibility that the particles are not uniformly distributed and are locally stacked.

The utility model discloses a functional principle as follows:

the material solution firstly enters a solution circulating pipe 20 from the outside through a pipe route feeding port 18, the solution in the circulating pipe enters a second mixer 22 under the action of a forced circulating pump 23, the solid particles and partial solution from a discharging pipe 21 enter the top end of the second mixer 22, the solution is uniformly mixed in the second mixer 22 and then enters a connecting solution pipeline and enters a bottom conical inlet of a mixing body 14, the solution simultaneously shunts a part of the solution at a conical opening to enter a mixing pipe 15, a part of the solution upwards enters a bottom connecting area of a column pipe heat exchanger 11 from a space area of the mixing body 14, the mixing pipe 15 is connected with a first mixer 13, the mixing pipe 15 is connected with the first mixer 13 and is designed into a plurality of groups according to requirements, the solution mixed flow flows through the pipe 15 and enters the second mixer 22 to be mixed with the particles from a particle circulating pipe 9, the particles are guided to a lower space area of the column pipe heat exchanger 11 by the fluid of the mixing pipe 15 under the drive of fluid force, the particles are disturbed and mixed with a main fluid from a mixture body 14 to the upper part, uniform mixing of the particles and a solution is realized, no mixing dead angle is ensured, the particles descending from the particle circulating pipe 9 effectively sink under the injection effect of the mixed flow pipe 15, particle backflow does not occur, the particles can be effectively mixed with the circulating solution under the premise of ensuring any fluid flow rate and are uniformly distributed in the bottom space area of the tubular heat exchanger 11, the particles enter the tube pass of the tubular heat exchanger 11 under the action of fluid force, a three-phase fluid fluidization state is formed in the tube pass, the effects of boiling, impact and disturbance are formed, a thermal boundary layer on the wall surface of a heating tube and a critical generation state of scaling are damaged, adhesion of scaling substances is prevented, the cleaning of the wall surface of the heating tube is kept, and the purposes of enhancing heat transfer and preventing scaling are achieved.

The material fluid containing particles flows upwards in the heating pipe of the tubular heat exchanger K, passes through an outlet at the upper end of the heating pipe and enters a space area formed by a particle separation area 24 and a particle storage area 25 which are formed by a bottom pipe plate of the tubular heat exchanger 11, the bottom and a side wall part of the evaporation tank 3 under the action of the gravity of the particles under the action of the guide cylinder 4, the particles flow downwards into a particle circulating pipe 9, the particle circulating pipe 9 performs flow regulation through a particle regulating valve 12, enters a second mixer 22 and reciprocates in such a way, and the self-circulation fluidization mode of the particles in the tubular heater L and the particle circulating pipe 9 is realized.

The heated and evaporated liquid enters a discharge pipe 6 after passing through a baffle plate 5, the discharge pipe 6 is connected with a gravity settling tube 16, and a small part of escaping particles which are not collected are further collected in the gravity settling tube 16, enter a second mixer 22 and participate in the fluidization operation again.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An anti-fouling evaporative concentration system with directional particle circulation, comprising: the device comprises a steam outlet (1), a steam-liquid separator (2), an evaporating pot (3), a guide cylinder (4), a baffle plate (5), a discharge pipe (6), a jet pipe (7), a jet regulating valve (8), a particle circulating pipe (9), a one-way valve (10), a tubular heat exchanger (11), a particle regulating valve (12), a first mixer (13), a mixture (14), a mixed flow pipe (15), a gravity settling pipe (16), a regulating valve (17), a feed inlet (18), a discharge outlet (19), a solution circulating pipe (20), a blanking pipe (21), a second mixer (22) and a forced circulation pump (23);

the steam outlet (1) is arranged at the top of the evaporation tank (3), the upper part of the evaporation tank (3) close to the steam outlet (1) is connected with a steam-liquid separator (2), the bottom of the evaporation tank (3) is connected with the upper port of the particle circulating pipe (9) and the upper port of each branch pipe of the jet pipe (7), each branch pipe of the jet pipe (7) is connected with a one-way valve (10), the lower port of each branch pipe of the jet pipe (7) is connected with the inlet of the jet regulating valve (8) through a pipeline, and the outlet of the jet regulating valve (8) is connected with the upper part of the side wall of the gravity settling pipe (16) through a connected pipeline;

the upper end of the tubular heat exchanger (11) extends into the inner part of the evaporation tank (3) and is provided with a guide cylinder (4), the tube side of the tubular heat exchanger (11) is a metal round tube, steam is introduced into the shell side of the tubular heat exchanger, fluid flows upwards through the tube side, the lower part of a tube bundle space at the bottom of the tubular heat exchanger (11) is connected with a conical structure, the side wall at the bottom of the conical structure is connected with a first mixer (13) through a pipeline, an inlet at the upper end of the first mixer (13) is connected with a lower port of a particle circulating tube (9), and the pipeline of the particle circulating tube (9) is connected with a particle regulating valve (; the first mixer (13) is connected with the mixed flow pipe (15), the outlet of the first mixer (13) is connected with the bottom end of a conical body connected with the bottom of the tube heat exchanger (11), and the solution of the mixed particles enters the bottom space; the lower part of the bottom conical body structure of the tube heat exchanger (11) is connected with the top port of the mixture (14), the upper part of the mixture (14) is cylindrical, and the lower part of the mixture (14) is a conical body;

an opening of the upper side wall of the gravity settling tube (16) is connected with a tube opening of a solution circulating tube (20), a feed inlet (18) and a discharge outlet (19) are connected to the solution circulating tube (20), the bottom of the solution circulating tube (20) is connected with an inlet of a forced circulation pump (23), an outlet of the forced circulation pump (23) is connected with an inlet of a second mixer (22), and an outlet solution of the second mixer (22) is connected with a bottom inlet of a lower conical body of the mixture body (14); the bottom conical part of the gravity settling tube (16) is connected with a discharging tube (21), a pipeline of the discharging tube (21) is connected with an adjusting valve (17), and the bottom of the discharging tube (21) is connected with an inlet at the top end of a second mixer (22); one end of the discharge pipe (6) is connected with the side wall of the evaporation tank (3), the inside of the evaporation tank (3) extends and is connected with a baffle plate (5) with an upward opening, and the discharge pipe (6) extends to the bottom of the gravity settling pipe (16).

2. An anti-scaling evaporative concentration system with directional particle circulation as claimed in claim 1, wherein the evaporation tank (3) is formed by connecting an upper cylinder and a lower cylinder with different diameters, wherein the diameter of the lower cylinder is larger than that of the upper cylinder.

3. A directional particle circulation scale-preventing evaporative concentration system according to claim 1, wherein the particle circulation pipe (9) is a single or multiple vertical round pipes or shaped pipes and is connected with the first mixer (13) at the bottom.

4. An anti-scaling evaporative concentration system with directional particle circulation as claimed in claim 1, wherein the forced circulation pump (23) is an axial flow pump or a mixed flow pump.