CN215027550U

CN215027550U - Hydrogen cyanide pretreatment equipment

Info

Publication number: CN215027550U
Application number: CN202120926156.8U
Authority: CN
Inventors: 秦中贤
Original assignee: CHONGQING SHANJU CHEMICAL MACHINERY CO LTD
Current assignee: CHONGQING SHANJU CHEMICAL MACHINERY CO LTD
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-12-07
Anticipated expiration: 2031-04-29

Abstract

The utility model belongs to the technical field of ammonia treatment for chemical product preparation, and discloses hydrogen cyanide pretreatment equipment, which comprises a pretreatment barrel, a flow guide pipe and a delivery pipe, wherein the flow guide pipe runs through the top of the pretreatment barrel and extends into the pretreatment barrel, the hydrogen cyanide pretreatment equipment also comprises a spray head arranged in the flow guide pipe, and a liquid inlet pipe is communicated on the spray head; a liquid outlet is arranged at the bottom of the pretreatment barrel, and a liquid outlet valve is arranged in the liquid outlet; the delivery pipe also penetrates through the upper part of the pretreatment barrel and is communicated with the pretreatment barrel. The utility model provides a prior art only carry out ammonia absorption through ammonia absorption tower, the effect is limited for still be mingled with the problem of ammonia in the hydrocyanic acid gas of derivation.

Description

Hydrogen cyanide pretreatment equipment

Technical Field

The utility model belongs to the technical field of the preparation of chemical products is with ammonia processing, concretely relates to hydrogen cyanide pretreatment equipment.

Background

Hydrocyanic acid, also known as formonitrile, hydrogen cyanide, is used mainly for the manufacture of nylon, pesticides, acrylonitrile, acrylic resins, etc. Production of hydrocyanic acid is generally carried out in a hydrocyanic acid reactor, and due to raw materials for preparing hydrocyanic acid, ammonia is entrained in gases after the reaction of hydrocyanic acid, so that ammonia is required to be absorbed by an ammonia absorption tower. However, when the production amount of hydrocyanic acid is large, the absorption effect of the ammonia absorption tower is limited, and ammonia is also included in the finally discharged hydrocyanic acid gas, which affects the subsequent use of hydrocyanic acid.

SUMMERY OF THE UTILITY MODEL

The utility model discloses it is anticipated to provide a hydrogen cyanide pretreatment of processes equipment to solve prior art and only carry out the ammonia through ammonia absorption tower and absorb, the effect is limited, makes still be mingled with the problem of ammonia in the hydrogen cyanide gas of deriving.

In order to achieve the purpose, the utility model provides the following technical scheme, a hydrogen cyanide pretreatment equipment, which comprises a pretreatment barrel, a flow guide pipe and a delivery pipe, wherein the flow guide pipe runs through the top of the pretreatment barrel and extends into the pretreatment barrel, the hydrogen cyanide pretreatment equipment also comprises a spray header arranged in the flow guide pipe, and the spray header is communicated with a liquid inlet pipe; a liquid outlet is arranged at the bottom of the pretreatment barrel, and a liquid outlet valve is arranged in the liquid outlet; the delivery pipe also penetrates through the upper part of the pretreatment barrel and is communicated with the pretreatment barrel.

The technical principle of the technical scheme is as follows:

the hydrocyanic acid gas after reaction in the hydrocyanic acid reactor is led into the pretreatment barrel through the honeycomb duct, and the hydrocyanic acid gas contacts with reaction liquid sprayed by the spray heads in the process of flow guide, so that the neutralization of partial ammonia in the hydrocyanic acid gas is completed, and the pretreatment of the hydrocyanic acid gas is realized. Then the pretreated hydrogen cyanate gas is guided into the ammonia absorption tower through a delivery pipe for ammonia treatment. After the hydrocyanic acid gas entering the ammonia absorption tower is pretreated, the ammonia content is reduced, and the effect of reabsorption by the ammonia absorption tower is good, so that the ammonia content in the hydrocyanic acid gas led out from the ammonia absorption tower can be reduced.

The beneficial effects of the technical scheme are as follows:

1. the hydrocyanic acid gas led out from the hydrocyanic acid reactor can carry out ammonia pre-absorption in the pretreatment barrel, and further can reduce the ammonia content in the hydrocyanic acid gas entering the ammonia absorption tower, so that the ammonia absorption tower can fully react and absorb the ammonia in the hydrocyanic acid gas;

2. after the hydrocyanic acid gas led out from the hydrocyanic acid reactor enters a flow guide pipe, a spray head is used for spraying neutralizing liquid, so that ammonia in the hydrocyanic acid gas can be neutralized, and the pretreatment of the hydrocyanic acid gas is realized; the neutralizing liquid is accumulated after entering the pretreatment barrel, and after the hydrocyanic acid gas enters the pretreatment barrel, the hydrocyanic acid gas contacts the neutralizing liquid again to complete ammonia absorption;

3. the hydrocyanic acid gas can contact with the neutralizing liquid after entering the draft tube, and can continuously contact with the hydrocyanic acid gas in the process of being led out from the draft tube, so that the contact reaction time of the hydrocyanic acid gas and the neutralizing liquid is long, and the absorption effect on ammonia is good;

4. hydrocyanic acid is after generating, and the temperature is higher, directly introduces into neutralization solution in the draught tube, can cool down the hydrocyanic acid gas, avoids appearing because of the problem that high temperature takes place to decompose.

Further, the pretreatment tank includes a tapered portion at an upper portion and a cylindrical portion at a lower portion, and the delivery pipe is provided on the tapered portion.

Has the advantages that: set up the upper portion of preliminary treatment bucket and become conical, can make when there is liquid to pile up at preliminary treatment bucket inner wall, the liquid drop can flow downwards along the toper portion of preliminary treatment bucket, and then accomplishes piling up of neutralization solution, and when the hydrocyanic acid gas of being convenient for got into the preliminary treatment bucket, with the contact of neutralization solution, carries out further ammonia processing, improves the effect of ammonia processing. And along with the accumulation of the neutralization solution, the liquid level rises, so that the time for contacting the liquid level of the neutralization solution is shortened after the hydrocyanic acid gas enters the pretreatment barrel, and the reaction is accelerated.

Furthermore, a float switch for controlling the opening and closing of the liquid outlet valve is arranged on the inner wall of the pretreatment barrel, and the floating head of the float switch is lower than the bottom end of the flow guide pipe.

Has the advantages that: when the liquid level in the pretreatment barrel rises to drive the float switch to move upwards, the liquid outlet valve in the liquid outlet pipe can be opened by the float switch, and then the reacted neutralization liquid is led out, so that the liquid level of the neutralization liquid is lowered, the flow guide pipe is prevented from being submerged by the neutralization liquid, and the resistance is increased.

Further, the delivery pipe is arranged in an upward inclined mode towards the direction far away from the pretreatment barrel.

Has the advantages that: the delivery pipe slope sets up to restrict the incline direction, can realize flowing along the delivery pipe along the neutralization liquid of the gaseous hydrocyanic acid entering delivery pipe after the preliminary treatment, flow back to in the preliminary treatment bucket.

Further, the inclination angle of delivery tube is 15 ~ 35.

Has the advantages that: the guiding air pipe is set to the angle, so that backflow of the neutralizing liquid can be realized, and the pretreated hydrocyanic acid gas can conveniently and quickly enter the ammonia absorption tower.

Furthermore, a sealing ring is arranged between the flow guide pipe and the pretreatment barrel.

Has the advantages that: through the setting of sealing washer, can reduce the probability that the hydrocyanic acid gas leaked.

Furthermore, the liquid outlet end of the spray header is obliquely arranged upwards.

Has the advantages that: the neutralizing liquid sprayed by the spray heads is inclined upwards, so that the flow path of the neutralizing liquid in the flow guide pipe is longer, the contact time of the neutralizing liquid and the hydrocyanic acid gas is prolonged, and the ammonia absorption effect is improved.

Furthermore, the spray headers are provided with a plurality of spray headers which are uniformly distributed on the inner ring of the flow guide pipe.

Has the advantages that: the volume of the neutralization liquid that a plurality of shower heads can increase to spray to shower head evenly distributed can improve the degree of consistency of neutralization liquid and the gaseous contact of hydrogen cyanate, thereby promotes the absorptive effect of ammonia.

Furthermore, the outer of the flow guide pipe is fixed with a coaxially arranged annular pipe, the spray heads are communicated with the annular pipe, and the liquid inlet pipe is communicated with the annular pipe.

Has the advantages that: set up the annular pipe, can utilize a feed liquor pipe just can accomplish leading-in neutralization solution with a plurality of shower heads intercommunication.

Furthermore, the top end of the upper surface of the delivery pipe is also provided with a spray head, and a liquid guide pipe is connected on the spray head.

Has the advantages that: the liquid is introduced through the liquid guide pipe and sprayed out through the spray head, the liquid can be contacted with the hydrogen cyanate gas again to absorb ammonia, and the neutralized liquid after reaction can flow along the inclined delivery pipe and enter the pretreatment barrel to be collected.

Drawings

Fig. 1 is a longitudinal sectional view of embodiment 1 of the present invention;

fig. 2 is a partial sectional view of embodiment 2 of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: pretreatment barrel 1, conical part 11, barrel part 12, liquid outlet 121, liquid outlet pipe 122, honeycomb duct 2, delivery pipe 3, shower head 4, float switch 5, annular pipe 6, liquid inlet pipe 7 and liquid guide pipe 8.

Example 1:

a hydrocyanic acid pretreatment apparatus, substantially as shown in figure 1, comprises a pretreatment barrel 1, a draft tube 2 and a delivery tube 3. The pretreatment barrel 1 comprises an upper conical part 11 and a lower cylindrical part 12, a communication hole is arranged at the top end of the conical part 11, and the guide pipe 2 is inserted into the pretreatment barrel 1 through the communication hole. Be provided with the sealing washer in the intercommunicating pore, the sealing washer can realize sealing honeycomb duct 2 and pretreatment barrel 1, reduces the probability that the hydrocyanic acid gas leaked.

A liquid outlet 121 is arranged at the lower part of the left side wall of the pretreatment barrel 1, a liquid outlet pipe 122 is communicated with the liquid outlet 121, a liquid outlet valve is arranged in the liquid outlet pipe 122, and the liquid outlet valve is an electromagnetic valve in the embodiment. The left side wall of the pretreatment barrel is provided with a float switch for controlling the on-off of the liquid outlet valve, and the floating head of the float switch 5 is lower than the bottom end of the flow guide pipe. Therefore, when the liquid level in the pretreatment barrel 1 rises to drive the floating head to move upwards, the float switch 5 controls the liquid outlet valve to be opened, and the neutralizing liquid in the pretreatment barrel 1 is led out; along with the liquid level descending, the float switch 5 drives the liquid outlet valve to close. The liquid level of the neutralization liquid in the pretreatment barrel 1 can be always lower than the bottom end of the draft tube 2.

A mounting hole is formed in the right side wall of the conical part 11 of the pretreatment barrel 1, the guide pipe 3 is inserted into the mounting hole, and the guide pipe 3 is communicated with the pretreatment barrel 1; also be provided with the sealing washer in the mounting hole, the sealing washer can realize sealing mounting hole and delivery tube 3, and then reduces the probability that the hydrocyanic acid gas leaked from the mounting hole.

The delivery tube 3 is inclined upward from left to right, and the inclination angle of the delivery tube 3 is 15 ~ 35 °, and the inclination angle of the delivery tube 3 in this embodiment is 20 °, so that the liquid can slide along the inclined delivery tube 3, and the inclination angle does not influence the flow of the hydrogen cyanate gas.

Be equipped with a plurality of shower heads 4 on the 2 inner walls of honeycomb duct, shower head 4 is equipped with 2 in this embodiment, and two 4 symmetry settings of shower head. An annular pipe 6 is coaxially fixed on the outer wall of the flow guide pipe 2, a guide pipe communicated with the spray heads 4 is arranged on the inner ring of the annular pipe 6, a liquid inlet pipe 7 is communicated with the outer ring of the annular pipe 6, and the liquid inlet pipe 7 is positioned between the two spray heads 4. The liquid outlet end of the spray head 4 is arranged in an upward inclined way, and the inclined angle is 15 degrees.

The specific implementation process is as follows:

when the device is used, the top of the draft tube 2 is communicated with the gas outlet end of the hydrocyanic acid reactor, and the right end of the draft tube 3 is communicated with the gas inlet of the ammonia absorption tower. In the preparation process of hydrocyanic acid, the hydrocyanic acid reactor leads generated hydrocyanic acid gas into the pretreatment barrel 1 through the guide pipe 2, and opens the spray header 4, so that the spray header 4 sprays neutralizing liquid into the guide pipe 2.

When the hydrocyanic acid gas flows in the guide pipe 2, the hydrocyanic acid gas contacts and reacts with neutralizing liquid sprayed by the spray head 4, so that ammonia is absorbed; and along with the flow of the hydrogen cyanate gas, the hydrogen cyanate gas is continuously contacted with the neutralizing liquid, so that the absorption effect of the ammonia is better. After the hydrogen cyanate gas enters the pretreatment barrel 1, the hydrogen cyanate gas contacts and reacts with the neutralizing liquid accumulated in the pretreatment barrel 1. And then introduced into the ammonia absorption tower through the lead-out pipe 3.

Neutralizing liquid sprayed by the spray header 4 is accumulated in the pretreatment barrel 1, so that the liquid level gradually rises, and after the liquid level rises to the floating head which drives the float switch 5 to move upwards, the liquid outlet valve is opened to lead out the neutralizing liquid in the pretreatment barrel 1. After the liquid level is lowered, the floating head of the float switch 5 is lowered, so that the liquid outlet valve is closed.

Example 2:

embodiment 2 differs from embodiment 1 only in that a shower head 4 is also provided on the top surface of the right end of the delivery pipe 3, and a liquid guide pipe 8 is connected to the shower head 4, as shown in fig. 2. Can realize spraying neutralization solution in the contact guide pipe 3, accomplish the continuous contact reaction to the hydrocyanic acid gas, absorb the ammonia that mingles with in the hydrocyanic acid gas. And the reacted neutralization solution can be guided to the pretreatment barrel 1 along the inclined delivery pipe 3 to be accumulated.

For those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the patent and the practicability of the patent.

Claims

1. A hydrocyanic acid pretreatment equipment, characterized in that: the pretreatment device comprises a pretreatment barrel, a flow guide pipe and a delivery pipe, wherein the flow guide pipe penetrates through the top of the pretreatment barrel and extends into the pretreatment barrel; a liquid outlet is arranged at the bottom of the pretreatment barrel, and a liquid outlet valve is arranged in the liquid outlet; the delivery pipe also penetrates through the upper part of the pretreatment barrel and is communicated with the pretreatment barrel.

2. The apparatus of claim 1, wherein: the pretreatment barrel comprises a conical part at the upper part and a round barrel part at the lower part, and the delivery pipe is arranged on the conical part.

3. The apparatus of claim 2, wherein: the inner wall of the pretreatment barrel is provided with a float switch for controlling the opening and closing of the liquid outlet valve, and the float head of the float switch is lower than the bottom end of the flow guide pipe.

4. The apparatus of claim 3, wherein: the delivery pipe is arranged in an upward inclined manner towards the direction far away from the pretreatment barrel.

5. The apparatus of claim 4, wherein: the inclination angle of delivery tube is 15 ~ 35.

6. The apparatus of claim 5, wherein: and a sealing ring is arranged between the flow guide pipe and the pretreatment barrel.

7. The apparatus of claim 6, wherein: the liquid outlet end of the spray header is obliquely arranged upwards.

8. The apparatus of claim 7, wherein: the shower head is equipped with a plurality ofly, and the equipartition is at the honeycomb duct inner circle.

9. The apparatus of claim 8, wherein: the outer of the diversion pipe is fixed with a coaxial annular pipe, the spray heads are communicated with the annular pipe, and the liquid inlet pipe is communicated with the annular pipe.

10. The apparatus of claim 9, wherein: the top end of the upper surface of the delivery pipe is also provided with a spray head, and the spray head is connected with a catheter.