CN2865845Y - Quenching mixer with symmetrical runners - Google Patents

Abstract

A quenching mixer with symmetrical interval channels. The mixer is composed of entrance 1a and 1b, outside interval channels 2a,2b,2c and 2d, inside interval channels 4a,4b,4c and 4d and center pipe 6. At the crossing of outside interval channels 2a and 2c, throttling hole 3a is set connected to inside interval channel. At the crossing of outside interval channels 2a and 2d, throttling hole 3b is set connected to inside interval channel. At the crossing of inside interval channels 4a and 4b, throttling hole 5a is set connected to center pipe 6. At the crossing of inside interval channels 4c and 4d, throttling hole 5b is set connected to center pipe 6. Center pipe 6 is opened on collecting board 7. At the part under opening, round baffle 9 is fastened with connecting strip 8. The quenching mixer can realize fully mixing of high temperature reactant flow and supplemented cold medium, reduce the radial temperature different at the next activator bed entrance and facilitate the functioning of activator activity and selection.

Description

A kind of quench mixer of runner symmetry

Technical field

The utility model relates to the interior a kind of member of reactor of a speciogenesis exothermic reaction, specifically a kind of reaction logistics and the additional well-mixed quench mixer of cold medium that can realize heat.

Background technology

Exothermic reaction is very general in petroleum refining and petrochemical process process, as hydrocracking reaction, hydrofining reaction and alkylated reaction etc. all are exothermic reactions, in some exothermal reaction process, if the temperature of reaction logistics is not controlled, catalyst in reactor bed temperature inside just might rise rapidly at short notice, and reach unmanageable degree, common " temperature runaway " phenomenon of indication that Here it is, therefore the thermal discharge when reaction is bigger, when the temperature rise of beds is higher, regulate and control the temperature of reaction logistics and what prevent " temperature runaway " phenomenon is very necessary by suitable cooling means.The heat-obtaining mode that can Gong select for use generally has non-direct heat-obtaining and directly adds the cooling medium dual mode, then a kind of mode is the better method that adopts usually, promptly the beds in the reactor is divided into two with upper bed layer, inner member is set between adjacent two beds and replenishes cold medium, reaching fully mixing of cold medium and thermal response logistics, and can be distributed to equably in next beds.

With the hydrogenation reaction is example, usually pass through beds with gas phase or gas, liquid two-phase in the logistics of hydrogenation reactor internal reaction, and exothermic reactions such as hydrocracking reaction, hydrofining reaction take place, in order to control the temperature of reaction logistics, prevent to take place in the beds " temperature runaway " phenomenon, usually cold medium is joined between two adjacent beds, and in the inner member of reactor with on the thermal response logistics that comes of a beds mix fully, and be distributed to equably in next beds.Mix logistics radially the position be very necessary with the top that the temperature and the composition of homogeneous enters next beds, because reaction stream temperature and composition gradient radially can further be aggravated owing to the carrying out of reaction, finally might cause hot-spot in the beds, improve and the selectivity reduction in hot-spot place activity of such catalysts, carbon deposit on the catalyst increases fast, particularly evident in hydrocracking process, this can cause the too early inactivation of catalyst, and because action of high temperature, the physical property of catalyst carrier is damaged, thereby causes the premature aging of catalyst.The inhomogeneous density of hydrogen of a certain part that also can make of reactant flow distribution is on the low side, and accelerates the carbon deposit speed of catalyst herein, and then the selectivity and the conversion ratio of influence reaction.

In hydrogenation reactor, the inner member between adjacent two beds generally comprises: cold medium inlet tube, quench mixer, pre-distribution grid and distribution grid.The effect of cold medium inlet tube is that the cold medium that temperature is lower is introduced in the reactor, be generally the structures such as straight tube, a shape pipe or loop pipe that have the rectangle perforate, cold medium is evenly sprayed by the opening of inlet tube, enter quench mixer with a last beds after next preliminary mixing of thermal response logistics, cold medium is generally the lower hydrogen of temperature, gaseous stream or liquid phase stream; The effect of quench mixer is to make the cold medium of introducing and the reaction logistics of heat realize the balance of mass transfer and heat transfer within it as far as possible, makes temperature and composition gradient in liquid phase or the gas phase very little; The effect of pre-distribution grid is that the mixture stream that comes out from quench mixer is distributed in advance, and arrives distribution grid, and pre-distribution grid is generally the sieve tray structure; The effect of distribution grid is to make to mix the top that logistics is distributed to next beds equably, and it is the platy structure of allocation units that distribution grid is generally with the bubble cap.

In hydrogenation process, the inner member of reactor mixes with the cold homogeneous media of replenishing except the reaction logistics with the heat of making and is evenly distributed to the effect of next beds, and the height of inner member also should be low as far as possible.Because the hydrogenation reactor great majority are high-pressure reactor, the diameter of reactor is big and wall is thicker, and a plurality of beds are arranged generally, also just need many group inner members, so the reduction of inner member height can make the total height of reactor reduce, thereby save the investment of reactor manufactured materials, and bring convenience for the transportation and the installation of reactor, can also save the investment of body supporting construction.

Quench mixer is the important component part of exothermic reactor inner member, the thermal response logistics that a last beds comes out mixes in quench mixer fully with the cold medium that replenishes into, in order to strengthen mixed effect, on the structural design of quench mixer, generally adopt the mechanism of throttling, collision and eddy flow.The disclosed quench mixer of US3502445 is that gas-liquid two-phase enters in the quench mixer through two throttle orifices on the collecting board, after the head-on collision of gas-fluid two-phase mixture stream process, is divided into two-way and goes out quench mixer.This structure has obtained extensive use on commercial plant, but its mixed effect is unsatisfactory, thereby cause next beds porch to have bigger radial temperature difference, carrying out along with reaction, radial temperature difference in the beds can further increase, and then influences the performance of catalyst performance.In addition, the complex structure of above-mentioned quench mixer, manufacturing and all relatively more difficult in the installation of inside reactor.

The utility model content

The purpose of this utility model is the quench mixer of a kind of runner symmetry of design, to avoid in next beds because the reaction logistics mixes localized hyperthermia that inequality causes increasing suddenly carbon deposit on the infringement of catalyst physical property and the catalyst with cold medium.

The quench mixer structure of the utility model design is as follows: quench mixer is by inlet 1a and 1b, outer side runner 2a, 2b, 2c and 2d, throttle orifice 3a and 3b, interior side runner 4a, 4b, 4c and 4d, throttle orifice 5a and 5b, and central tube 6 formations, central tube 6 is opened on the collecting board 7, is the circular baffle plate 9 of fixing with connection strap 8 below opening.

Described outer side runner 2a, 2b, 2c and 2d, interior side runner 4a, 4b, 4c and 4d cross section are square, rectangle, circle or semicircle.

The integral body of the quench mixer of the utility model design is made outside reactor and is installed at inside reactor with integral form; Also quench mixer can be divided into some assemblies and in the inside reactor assembly unit.

The quench mixer of the utility model design can be realized fully mixing of pyroreaction logistics and the cold medium that replenishes, and reduces the radial temperature difference of next beds porch, helps catalyst activity and optionally gives full play to.

Description of drawings

The schematic diagram of quench mixer inner flow passage that Fig. 1 designs for the utility model and logistics trend, Fig. 2 are that A-A among Fig. 1 is to view.

The specific embodiment

Beds in the exothermic reactor is divided into the multistage bed, be provided with one group of inner member in the space between the adjacent bed, the medium that the temperature of replenishing is lower is realized fully mixing in quench mixer with the pyroreaction logistics that a last beds comes, and has adopted mechanism such as throttling, collision on the structure of quench mixer.The mixture flow point does not enter by two inlets of quench mixer, per share logistics is divided into two strands again, advance along outer side runner, respectively through behind one section runner, four bursts of logistics bump in twos and mix, and enter interior side runner through two throttle orifices, and be divided into four bursts of logistics once more, after interior side runner expert advances a segment distance, and the collision in twos of logistics takes place once more, and translateral respectively throttle orifice enters central tube, the central tube perforate is on collecting board, below perforate, be provided with a circular baffle plate, make logistics before arriving pre-distribution grid, carry out initial distribution.

Because the temperature rise in the exothermic reactor in the different process has bigger difference, and the ratio of gas-liquid two-phase logistics also has bigger difference, therefore, this quench mixer is in being applied to different exothermic reactors the time, can change being provided with to some extent of runner, promptly the inboard of side runner increases by one to two circulation road again in above-mentioned, to prolong the time of staying of fluid in quench mixer, strengthens mixed effect.In addition, difform baffle plate can also be set,, make fluid realize repeatedly throttling to change the flow area of runner in the inside of runner.In addition,, the bubble cap structure with swabbing action can be set in central tube, below collecting board, install stream breaker additional, make fluid have certain initial distribution in order to strengthen the mixed effect of fluid in central tube.

Below in conjunction with accompanying drawing the quench mixer that the utility model designs is given further instruction, but therefore do not limit the utility model.

The schematic diagram of quench mixer inner flow passage that Fig. 1 designs for the utility model and logistics trend, Fig. 2 are that A-A among Fig. 1 is to view.

The quench mixer structure of the utility model design is as follows: quench mixer is by inlet 1a and 1b, outer side runner 2a, 2b, 2c and 2d, throttle orifice 3a and 3b, interior side runner 4a, 4b, 4c and 4d, throttle orifice 5a and 5b, and central tube 6 formations, central tube 6 is opened on the collecting board 7, is the circular baffle plate 9 of fixing with connection strap 8 below opening.

The method of operating of the quench mixer of the utility model design is as follows:

As shown in Figure 1, quench mixer is installed on the collecting board 7, seal between the outer rim of collecting board 7 and the reactor wall, the thermal response logistics that a last beds comes does not enter quench mixer by the inlet 1a and the 1b of quench mixer with the mixture flow point of the cold medium that replenishes, and be divided into two strands separately, two bursts of logistics that longshore current road 2a and 2c advance bump at throttle orifice 3a place and mix the back and enter interior side runner by throttle orifice 3a, two bursts of logistics that longshore current road 2b and 2d advance bump at throttle orifice 3b place and mix the back and enter interior side runner by throttle orifice 3b, two bursts of logistics are divided into two strands again separately in interior side runner, two bursts of logistics that longshore current road 4a and 4b advance bump at throttle orifice 5a place and mix the back and enter central tube 6 by throttle orifice 5a, two bursts of logistics that longshore current road 4c and 4d advance bump at throttle orifice 5b place and mix the back and enter central tube 6 by throttle orifice 5b, bump once more and mix in central tube 6 interior two bursts of logistics, and go out quench mixer through the opening of central tube 6 on collecting board 7, be provided with circular baffle plate 9 below quench mixer outlet, the mixture circular baffle plate 9 of flowing through carries out arriving after the initial distribution the pre-distribution grid of bottom.

Fig. 2 is that A-A among Fig. 1 is to view, the case structure that the main body of quench mixer is made up of runner 2a, 2b, 2c, 2d and runner 4a, 4b, 4c, 4d and central tube 6, the quench mixer of this case structure is installed on the collecting board 7, central tube 6 is opened on the collecting board 7, rush at pre-distribution grid in the concentrated area in order to prevent that mixture from flowing through, be provided with below the opening of central tube 6 with the fixing circular baffle plate 9 of connection strap 8, circular baffle plate 9 can be to mixing originally the begin effect that distributes of logistics.

The quench mixer that the utility model provides has following advantage:

1, the quench mixer main body is case structure, and is simple in structure, makes easily.

2, the overall structure of quench mixer can be finished manufacturing outside reactor, and directly installs at inside reactor, has saved the assembly unit process at inside reactor, is easy to install.

3, mix logistics in quench mixer inside through twice collision and twice throttling, strengthened the mixing of fluid, mixture stream has reached good mixed effect through mass transfer fully and after conducting heat, thereby has reduced the radial temperature difference of next beds porch effectively.

4, because the reaction logistics of heat and additional cold medium mainly are to mix in quench mixer, and quench mixer has mixed effect preferably, therefore, can reduce requirement, adopt the comparatively simple cold medium inlet tube of structure cold medium inlet tube structure.Particularly be gas phase when single-phase when the reaction logistics in the reactor and the cold medium that replenishes, cold medium inlet tube can directly be opened on the wall of reactor, saves the part that it stretches into inside reactor.

5, except the structure that can simplify cold medium inlet tube, cold medium inlet tube can also the as close as possible quench mixer that is installed on the collecting board at the aperture position on the wall of reactor, thereby can reduce the spatial altitude between the supreme beds supportive grid of collecting board, reduce the spatial altitude of inside reactor, help reducing the investment cost of equipment and materials, simultaneously because the reduction of reactor body weight, also help the transportation and the installation of reactor, reduce transportation and capital expenditure.

6, when the cross section of quench mixer runner is rectangle, under the certain situation of cross section of fluid channel, can reduce the height of runner by the width that increases runner, thereby make quench mixer have less height, the spatial altitude that takies reactor reduces, also the required spatial altitude of inside reactor be can effectively reduce, equipment investment and capital expenditure helped reducing.

Claims (4)

1, a kind of quench mixer of runner symmetry, it is characterized in that this quench mixer is by inlet (1a) and (1b), outer side runner (2a), (2b), (2c) and (2d), interior side runner (4a), (4b), (4c) and (4d), central tube (6) constitutes, wherein outer side runner (2a) has throttle orifice (3a) to communicate with interior side runner with the intersection of (2c), outer side runner (2b) has throttle orifice (3b) to communicate with interior side runner with the intersection of (2d), interior side runner (4a) has throttle orifice (5a) to communicate with central tube (6) with the intersection of (4b), interior side runner (4c) has throttle orifice (5b) to communicate with central tube (6) with the intersection of (4d), central tube (6) is opened on the collecting board (7), is with the fixing circular baffle plate (9) of connection strap (8) below opening.

2, according to the quench mixer of claim 1, it is characterized in that described outer side runner (2a), (2b), (2c) and (2d), interior side runner (4a), (4b), (4c) and (4d) cross section be square, rectangle, circle or semicircle.

3,, it is characterized in that the integral body of quench mixer is made and installed at inside reactor with integral form outside reactor according to the quench mixer of claim 1.

4,, it is characterized in that quench mixer is divided into some assemblies and in the inside reactor assembly unit according to the quench mixer of claim 1.

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