CN209108648U

CN209108648U - A kind of tail gas heat recovery equipment for nitric acid production

Info

Publication number: CN209108648U
Application number: CN201821604578.8U
Authority: CN
Inventors: 郭媛媛; 柴向阳; 赵瑞生; 张娟娟
Original assignee: TIANJIN HUAJING CHEMICAL NEW TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: Tianjin Huajing Engineering Technology Co.,Ltd.
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2019-07-16
Anticipated expiration: 2028-09-29

Abstract

The utility model provides a kind of tail gas heat recovery equipment for nitric acid production, including tail gas heat exchanging segment, it includes heat exchange pipeline, and surround the inner cylinder of heat exchange pipeline, upper outer shell is covered with outside the inner cylinder, the inner cylinder extends outward cold tail gas air inlet, and cold tail gas air inlet is in communication with the outside across upper outer shell, and cold tail gas gas outlet is also provided on the shell body sidewall；Condensed heat transfer fluid section comprising the lower shell body connecting with upper outer shell, the lower shell body is interior to be equipped with fin pipeline, and the fin pipe ends extend outward condensate liquid inlet tube and condensate liquid liquid outlet respectively；It is connected between the upper outer shell and lower shell body by a pipe nipple.The utility model gradually cools down to the hot exhaust gas in production system, is made full use of remaining thermal energy in hot exhaust gas using the tail gas heat exchanging segment and condensed heat transfer fluid section that are connected, heats to raw material stand-by in production equipment, reduces heat dissipation while saving the energy.

Description

A kind of tail gas heat recovery equipment for nitric acid production

Technical field

The utility model belongs to preheating recycling field, sets more particularly, to a kind of tail gas recuperation of heat for nitric acid production It is standby.

Background technique

In nitric acid production, the main energy with during tail gas turbine machine remanufacture, but and gas lower in air inlet pressure Tail gas turbine machine power is lower in the higher situation of temperature, and energy is caused not recycle efficiently, tail gas turbine machine Still it is discharged high-temperature tail gas, in existing technology, the high-temperature tail gas that usually tail gas turbine machine is discharged is recycled, and is deposited using it The heat stayed heats steam to be used or condensate liquid, but the usual figure of equipment for heating is larger, and to difference Heat medium need different heat exchangers to reach heat exchange purpose, increase hot fluid flows through tube side, leads to partial heat It scatters and disappears, and required plurality of devices increases pipeline arrangement difficulty and the resistance of ducting.

Utility model content

In view of this, the utility model is directed to a kind of tail gas heat recovery equipment for nitric acid production, to provide one The novel heat recovery equipment of kind, meets the heat exchange of gas medium and liquid medium, saves land occupation.

In order to achieve the above objectives, the technical solution of the utility model is achieved in that

A kind of tail gas heat recovery equipment for nitric acid production, including

Tail gas heat exchanging segment comprising heat exchange pipeline, and the inner cylinder of heat exchange pipeline is surrounded, it is covered with outside the inner cylinder Upper outer shell, the upper outer shell bottom are provided with tail gas air inlet, and the upper outer shell side wall upper part is also provided with cold tail gas outlet Mouthful；

Condensed heat transfer fluid section comprising the lower shell body connecting with upper outer shell, the lower shell body is interior to be equipped with finned tube Road, the fin pipe ends extend outward condensate liquid inlet tube and condensate liquid liquid outlet respectively；

It is connected between the tail gas heat exchanging segment and condensed heat transfer fluid section by a pipe nipple.

Further, the heat exchange pipeline is a plurality of, and every heat exchange pipeline is parallel to each other, and pipe ends are managed with one Plate is fixed, and the tube sheet edge is connect with upper outer shell.

Further, the upper outer shell extends upward hot exhaust gas air inlet, and the lower shell body extends downwardly out heat Tail gas gas outlet.

Further, the condensate liquid liquid outlet is set to above condensate liquid inlet tube.

Further, a desalination water inlet is provided in the middle part of the condensate liquid inlet tube.

Further, between the inner cylinder and upper outer shell there are gap, and gap is divided into and not being connected to mutually by a partition Air inlet section and air outlet section, the air inlet section is connected to cold tail gas air inlet, and air outlet section is connected to gas outlet.

Further, a tapping valve being in communication with the outside is equipped between two tube sheet.

Further, the tapping valve is disposed far from one end of hot exhaust gas air inlet.

Further, the inner cylinder extends inwardly multiple deflectors, and deflector is staggered.

Compared with the existing technology, a kind of tail gas heat recovery equipment described in the utility model has the advantage that

The utility model is using the tail gas heat exchanging segment and condensed heat transfer fluid section being connected, gradually to the hot tail in production system Gas cooling, makes full use of remaining thermal energy in hot exhaust gas, heats to raw material stand-by in production equipment, while saving the energy Reduce heat dissipation；

Using a plurality of heat exchanger tube, the contact area for increasing hot exhaust gas and cold tail gas guarantees heat exchange efficiency, using liquid medium The mode flowed in fin pipeline extends the time of contact of liquid and hot exhaust gas, guarantees that heat exchange sufficiently carries out；

Using a pipe nipple connection upper outer shell and lower shell body, the hot exhaust gas in heat exchanger tube is set to gather together, later It is passed through in lower shell body, exchanges heat with the liquid in finned tube；

It is mutually connected with condensed heat transfer fluid section by pipe nipple using tail gas heat exchanging segment, reduces accounting for for heat exchange equipment Ground.

Detailed description of the invention

The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.? In attached drawing:

Fig. 1 is heat recovery equipment overall schematic.

Description of symbols:

1- tail gas heat exchanging segment；11- heat exchange pipeline；12- inner cylinder；13- upper outer shell；The cold tail gas air inlet of 14-；15- is cold Tail gas gas outlet；16- deflector；17- hot exhaust gas air inlet；The gap 18-；181- air inlet section；182- air outlet section；183- partition； 19- tube sheet；2- condensed heat transfer fluid section；21- condensate liquid inlet tube；22- condensate liquid liquid outlet；23- desalination water inlet；24- fin Pipeline；25- hot exhaust gas gas outlet；4- tapping valve；26- lower shell body；3- pipe nipple.

Specific embodiment

It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can To be combined with each other.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower", The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand For limitations of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result, Feature can explicitly or implicitly include one or more of the features.It is in the description of the present invention, unless another It is described, the meaning of " plurality " is two or more.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition State the concrete meaning of term in the present invention.

The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

A kind of tail gas heat recovery equipment for nitric acid production, including tail gas heat exchanging segment 1 and condensed heat transfer fluid section 2；

The tail gas heat exchanging segment 1 includes set of heat exchange tubes, and the set of heat exchange tubes includes the more heat exchanger tubes being set side by side, described Set of heat exchange tubes both ends are provided with the tube sheet 19 for fixing heat exchanger tube, and inner cylinder 12, inner cylinder are covered with outside the set of heat exchange tubes 12 both ends end are not contacted with tube sheet 19, and the side wall of the inner cylinder 12 extends inwardly interlaced deflector 16, described interior It is covered with upper outer shell 13 outside cylinder 12,13 lower sidewall of upper outer shell is provided with cold tail gas air inlet 14, and top is provided with cold Tail gas gas outlet 15, the upper outer shell 13 extend hot exhaust gas air inlet 17, the tube sheet along heat exchanger tube length direction upwards 19 edge and upper outer shell 13 are tightly connected, there are gap 18 between the upper outer shell 13 and inner cylinder 12, and a partition 183 divide in gap 18 for mutual disconnected air inlet section 181 and air outlet section 182, and the air inlet section 181 connects with cold tail gas air inlet 14 Logical, air outlet section 182 is connected to gas outlet, when cold tail gas enters tail gas heat exchanging segment 1 from cold tail gas air inlet 14, is passed sequentially through Cold tail gas air inlet 14, air inlet section 181,12 inside of inner cylinder and air outlet section 182, are finally discharged from cold tail gas gas outlet 15；

The condensed heat transfer fluid section 2 includes finned tube, and lower shell body 26, the lower shell body are covered with outside the finned tube 26 extend downwardly out hot exhaust gas gas outlet 25, and the two sides of the lower shell body 26 each extend over out 21 He of condensate liquid inlet tube outward Condensate liquid liquid outlet 22, and condensate liquid import is set to the lower section of condensate liquid liquid outlet 22, the condensate liquid inlet tube 21 is in one Desalination water inlet 23 connects, and the lower shell body 26 extends upward 13 interface of upper outer shell；

The upper outer shell 13 extends downwardly out 13 interface of upper outer shell, 13 interface of upper outer shell and lower shell body 26 Between interface by a tubular pipe nipple 3 connect, and 3 upper end opening section of the pipe nipple be circle, lower ending opening section be it is rectangular, And 3 both ends of pipe nipple and two outer housings are welding.

The tail gas heat exchanging segment 1 between two tube sheets 19 be equipped with tapping valve 4, the tapping valve 4 be disposed far from hot exhaust gas into Port 17.

At work, which places vertically, and the hot exhaust gas generated in production equipment is passed through heat by pipeline Tail gas air inlet 17, hot exhaust gas enter in pipe nipple 3 by heat exchanger tube, in the process, the cold tail gas that equipment generates are passed through pipe Road is passed through in cold tail gas air inlet 14, and cold tail gas is by cold tail gas air inlet 14 through air inlet section 181 into inner cylinder 12 and to overflow The mode and heat exchanger tube of stream exchange heat, and flow out at the top of inner cylinder 12 until reaching, into air outlet section 182, finally from cold tail gas outlet Mouth 15 is discharged, and in the process, increases the process of cold tail gas by deflector 16, and so that cold tail gas and hot exhaust gas is exchanged heat makes hot exhaust gas Temperature reduces, and cold exhaust temperature increases, and after a period of operation, the condensation between two tube sheets 19 is discharged in openable tapping valve 4 Liquid；

Hot exhaust gas is flowed downward by pipe nipple 3, is entered through in the lower heat exchanging segment that lower shell body 26 surrounds, by condensate liquid with Desalted water is passed through in condensate liquid inlet tube 21 and desalination water inlet 23 according to ratio needed for producing, and two kinds of liquid enter finned tube And mixed in finned tube, and continue to exchange heat with the hot exhaust gas in lower heat exchanging segment, hot exhaust gas heat is further decreased, liquid is promoted Temperature efficiently uses the thermal energy in hot exhaust gas, reduces thermal loss and thermal pollution.

The hot exhaust gas is 230 degree of hot steams being discharged from turbine.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection scope within.

Claims

1. a kind of tail gas heat recovery equipment for nitric acid production, it is characterised in that: including

Tail gas heat exchanging segment (1) comprising heat exchange pipeline (11), and the inner cylinder (12) of heat exchange pipeline (11) is surrounded, it is described interior It is covered with upper outer shell (13) outside cylinder (12), upper outer shell (13) bottom is provided with tail gas air inlet (14), described outer Shell (13) side wall upper part is also provided with cold tail gas gas outlet (15)；

Condensed heat transfer fluid section (2) comprising the lower shell body (26) connecting with upper outer shell (13), the lower shell body (26) are interior Equipped with fin pipeline (24), fin pipeline (24) both ends extend outward condensate liquid inlet tube (21) respectively and condensate liquid goes out Liquid mouth (22)；

It is connect between the tail gas heat exchanging segment (1) and condensed heat transfer fluid section (2) by a pipe nipple (3).

2. a kind of tail gas heat recovery equipment for nitric acid production according to claim 1, it is characterised in that: the heat exchange Pipeline (11) is a plurality of, and every heat exchange pipeline (11) is parallel to each other, and pipe ends are fixed with a tube sheet (19), the pipe Plate (19) edge is connect with upper outer shell (13).

3. a kind of tail gas heat recovery equipment for nitric acid production according to claim 2, it is characterised in that: described outer Shell (13) extends upward hot exhaust gas air inlet (17), and the lower shell body (26) extends downwardly out hot exhaust gas gas outlet (25)。

4. a kind of tail gas heat recovery equipment for nitric acid production according to claim 1, it is characterised in that: the condensation Liquid liquid outlet (22) is set to above condensate liquid inlet tube (21).

5. a kind of tail gas heat recovery equipment for nitric acid production according to claim 1, it is characterised in that: the condensation A desalination water inlet (23) is provided in the middle part of liquid inlet tube (21).

6. a kind of tail gas heat recovery equipment for nitric acid production according to claim 1, it is characterised in that: the inner cylinder There are gap (18) between body (12) and upper outer shell (13), and gap (18) are divided into mutual disconnected air inlet section by a partition (181) it is connected to air outlet section (182), the air inlet section (181) with cold tail gas air inlet (14), air outlet section (182) and cold tail gas Gas outlet (15) connection.

7. a kind of tail gas heat recovery equipment for nitric acid production according to claim 3, it is characterised in that: two pipes A tapping valve (4) being in communication with the outside is equipped between plate (19).

8. a kind of tail gas heat recovery equipment for nitric acid production according to claim 7, it is characterised in that: the drain Valve (4) is disposed far from one end of hot exhaust gas air inlet (17).

9. a kind of tail gas heat recovery equipment for nitric acid production according to claim 1, it is characterised in that: the inner cylinder Body (12) extends inwardly multiple deflectors (16), and deflector (16) is staggered.