CN208205873U - Shell-and-tube flue gas heat-exchange unit - Google Patents

Abstract

The utility model relates to a kind of shell-and-tube smoke heat replacing devices, including the tubular shell being laterally arranged, multiple heat exchanger tubes being axially arranged are equipped in the shell, the tube sheet being tightly connected with case inside wall is equipped with by two close end in the shell, several baffle plates are equipped between two tube sheets, the heat exchanger tube passes through the through-hole being arranged on the baffle plate and is sealedly connected in the through-hole being arranged on the tube sheet, the both ends of the shell are equipped with flue connector, the flue connector includes rectangular section matched with flue and the circle segments matched with the shell, described rectangular section is connect with the circle segments by conical section and junction rounding off, the heat transfer tube wall is equipped with multilayer inner rib plate in the axial direction.The utility model can be docked directly with flue, can effectively solve transducer wall's abrasion and fouling phenomenon, improve low-level (stack-gas) economizer operational reliability.

Description

Shell-and-tube flue gas heat-exchange unit

Technical field

The utility model relates to a kind of heat-exchanger rig, in particular to a kind of shell-and-tube cigarette that can be connected directly between on flue Gas heat exchanger.

Background technique

Low-level (stack-gas) economizer is a kind of heat-exchange apparatus that water supply is heated using the heat of boiler tail flue gas.It is mainly made With being to reduce exhaust gas temperature, boiler efficiency is improved, fuel is saved, and serves as part heating heating surface or evaporating heating surface.From low From the point of view of the dominant failure mode of warm economizer, abrasion is the common failure of low-level (stack-gas) economizer.When flue gas flows through heating surface, Flying dust in flue gas constantly impacts heat pipe, causes heated tube wall thinning, long-term frayed and leak.When the grey flue gas of band flows through respectively When heating surface, part fly ash granule will be deposited on heating surface because of a variety of causes, form dust stratification.In low-level (stack-gas) economizer entrance Place, because low-level (stack-gas) economizer inlet section increases, flue gas flow rate is reduced, and low-level (stack-gas) economizer has resistance to flue gas, therefore in low temperature Also dust stratification accumulation is easily formed before economizer, and low-level (stack-gas) economizer is caused to be not normally functioning and fail.

Utility model content

In order to solve the above technical problems, the utility model provides a kind of shell-and-tube flue gas heat-exchange unit, with effective solution Transducer wall's abrasion and fouling phenomenon improve low-level (stack-gas) economizer operational reliability.

The technical solution of the utility model is:

A kind of shell-and-tube smoke heat replacing device comprising lateral shell and that the shell is arranged in is intracorporal several lateral Heat exchanger tube, in a tubular form, air inlet side and out gas side are equipped with closed tube sheet to the shell, and the tube sheet is interior with the shell Wall is tightly connected, and several baffle plates are equipped between the tube sheet, and the heat exchanger tube passes through the pore on the baffle plate of corresponding site, The pore of its inlet end and air inlet side tube sheet is tightly connected, and the pore of outlet side and outlet side pipe plate is tightly connected.

Preferred distribution has several inner rib plates on the inner wall of the heat exchanger tube.

The distribution mode of the inner rib plate can be to be multiple rows of along being divided axially into, and the quantity positioned at the inner rib plate of same row is more It is a and be circumferentially uniformly distributed.

Preferably, stagger arrangement is distributed the inner rib plate of adjacent row in the circumferential.

The inner rib plate can be flute profile or tooth form, and windward side tilts backwards, and tilt angle is preferably 45 °.

The air side and inlet side of the shell can be equipped with heat-absorbing medium interface, such as inlet and outlet, described Space in pipe between heat-absorbing medium orifice inlet side tube sheet and air side tube sheet.

The baffle plate can be perpendicular scarce type baffle plate, and the notch preferred orientations of adjacent baffle are opposite.

It can be equipped on the shell for detecting medium temperature and pressure in each tube side section separated by baffle plate Temperature sensor and pressure sensor.

The shell is preferably cylindrical, and both ends can be equipped with the reducing connecting tube connected for same rectangular duct, The outer spout of the reducing connecting tube is in rectangle, by rectangle to circular reducer using smooth transition structure.

The lower part of the shell can be equipped with bracket (or pedestal), and the quantity of the bracket can be two, preferably divide Not Wei Yu inlet side tube sheet and air side tube sheet lower section.

The utility model has the following beneficial effects:

It is connected since shell-and-tube flue gas heat-exchange unit is rounded reducing connecting tube by side with flue, flue gas flow rate increases, flue gas It is very high by heat-exchanging tube bundle formula flow velocity, avoid the low caused sedimentation dust stratification of flue gas flow rate；Since flue gas is changed from stagger arrangement inner rib plate Heat pipe bundle passes through, and by fin in the form of crossing, dust particles are influenced flue gas by fin and surrounding flue gas, can deflecting to from Central area passes through in managing, and avoids wall surface dust stratification significantly, meanwhile, the degree of wear caused by flue gas in stagger arrangement inner rib plate heat exchanger tube Other heat exchanger tubes can be lower than；Water passes through in shell shell, and using the perpendicular scarce type baffle plate of multiple baffling, the flow field of water flow is more equal Even, circulation heat exchange is more evenly.

Detailed description of the invention

Fig. 1 is a kind of schematic diagram of embodiment of the utility model；

Fig. 2 is the side view of embodiment illustrated in fig. 1；

Fig. 3 is a kind of sectional schematic diagram of heat exchanger tube of the utility model；

Fig. 4 is the schematic diagram that the utility model relates to connect with flue variable diameter.

Specific embodiment

The utility model is described further with reference to the accompanying drawing.

As Figure 1-Figure 4, the utility model relates to a kind of shell-and-tube smoke heat replacing devices, including the tubulose being laterally arranged Shell 2, the shell 2 is interior to be equipped with multiple heat exchanger tubes 4 being axially arranged, and the heat exchanger tube 4 forms exhaust gases passes, the shell 2 It is interior to be equipped with the tube sheet 1 that is tightly connected with case inside wall by two close end, by space in the shell 2 and exterior space mutually every It opens, several baffle plates 3 is equipped between two tube sheets 1, the baffle plate 3 is used to support heat exchanger tube tube bank and by the shell Intracorporal space is divided into multiple shell side sections, flows water flow in the shell along broken line, flow direction is varied multiple times, mentions High flow rate, enhancing heat exchange, the heat exchanger tube 4 pass through the through-hole being arranged on the baffle plate 3 and are sealedly connected on the tube sheet 1 In the through-hole of setting, the both ends of the shell 2 are equipped with flue connector, and the flue connector can be for by rectangle to circular variable diameter Connecting tube, so as to shell using circular tube shaped and flue use rectangular flue when interconnection, by flue connector directly with Flue connection, easy to use, the flue connector includes rectangular section 11 matched with flue and matches with the shell Circle segments 13, described rectangular section 11 is connect and junction rounding off with the circle segments 13 by conical section 12, the hole of flue Diameter is greater than the aperture of the shell 2, and the conical section 12 of the flue connector forms the spray orifice form shunk, and increases flow velocity, avoids Dust stratification is settled caused by flue gas flow rate is low.

Preferably, the inner wall of the shell 2 is equipped with insulating layer, prevents thermal loss.

Preferably, 4 inner wall of heat exchanger tube is equipped with multilayer inner rib plate 17 in the axial direction, on the one hand increases radiating surface Product improves heat exchange efficiency, on the other hand, when flue gas flows through the inner rib plate 17, can cross each layer internal-rib in the form crossed Region between piece 17 and adjacent layer inner rib plate 17 generates turbulent area small one by one, and makes heat exchanger tube described in flue gas flow direction Central area, avoid generate dust stratification.

Preferably, each layer inner rib plate 17 is arranged circumferentially along the inner wall of the heat exchanger tube 4, guarantees air-flow and heat dissipation effect Uniformly.

Preferably, inner rib plate 17 described in adjacent layer is staggeredly arranged, and can make the raw effect rotated in the circumferential of flue gas miscarriage.

Preferably, the inner rib plate 17 is flute profile or tooth form, it is preferred to use with tangential (heat exchanger tube is at setting inner rib plate Tangentially) parallel surface plate or tangential middle part is convex to windward side and pole panel, the axis of the cylinder are located at heat exchanger tube radius With the plane where axis and relative to the plane mirror symmetry, the downward wind direction inclination in the windward side of at least described inner rib plate 17 (i.e. inner end retreats), reduces the resistance of flow of flue gas, and flue dust is made to flow to casing center region under the action of inertia, keeps away Exempt from nearby to deposit due to the effects such as air-flow is viscous on the inner wall of the housing, the tilt angle of the inner rib plate is (with diameter of the housing direction The angle of cut) it is preferably 45 °.

Preferably, 2 top of shell is equipped with water inlet 5, the shell 2 close to the side of 4 air outlet of heat exchanger tube Lower part is equipped with water outlet 8 close to the side of 4 air inlet of heat exchanger tube, and the mode water flow of upper entering and lower leaving is than smoother, and water flow Direction it is contrary with flow of flue gas, flue gas in pipe always all than pipe outside water flow temperature it is high, more fully carry out hot friendship It changes.

Preferably, the preferably perpendicular scarce type baffle plate of the baffle plate 3, relative to a circular slab and in vertical one side edge Place has equipped with notch, and notch size is rationally designed according to the gap between the internal diameter and adjacent baffle of the shell, phase The notch of adjacent baffle plate 3 it is contrary and close to water inlet side 3 notch direction of baffle plate upward, the number of the baffle plate 3 Amount preferably uses odd number, to optimize water flow tissue using the setting of upper lower intake, can make in the shell 2 full of water.

Preferably, each shell side section that the baffle plate 3 is separated to form is equipped with for detecting water temperature and hydraulic pressure in shell Temperature sensor and pressure sensor 6 prompt the heat exchanger to need to safeguard when temperature or pressure anomaly.

Preferably, the lower part of the shell 2 is equipped with bracket 7, and the quantity of the bracket 7 is two, respectively close to the shell The front-end and back-end of body 2 are preferably placed at the underface of two sides tube sheet, in favor of the support to tube sheet.

Preferably, the outer spout of the flue connector can be equipped with the flange of connection, will pass through flange connection It is connect with front and back side flue.

The annular for docking the flue connector can be equipped at inlet side (or upwind) port of the shell 2 Tongue-and-groove or annular concave mouth 15 can be equipped with the annular for docking the flue connector at air side (or lower wind direction) port Male half coupling 16 forms the company of imbricate between the flue connector of inlet side, the shell and the flue connector of air side It connects, connection relationship is simple and can prevent the leakage of flue gas, and the annular tongue-and-groove or annular concave mouth 15 and the convex annular stop It is equipped with sealing heat insulating washer at mouth 16, further functions as sealing function, and prevent the loss of heat, the shell enters the wind side ports Inside can be equipped with the small conical nozzle 14 of outer imperial palace, the quantity of the conical nozzle 14 can be one or more, for letter Just for the sake of and effect, typically one (referring to fig. 4) are taken into account, air inlet basically comprises whole air intake surfaces of shell Product, air outlet face the pore of the air inlet port of corresponding heat exchanger tube inlet side tube sheet in other words, and the same conical nozzle can be with Corresponding to a heat exchanger tube import, multiple or even whole heat exchanger tube imports can also be corresponded to simultaneously, from there through conical nozzle Play the role of acceleration and gradually transition to flue gas, avoids accumulating before leading to inlet side tube sheet because of the transformation of airflow direction moment Ash, the conical nozzle 14 are connected in the shell in a manner of fixed or is dismountable, are convenient for changing.

It is disclosed by the utility model it is each preferably with optional technological means, unless otherwise indicated and a preferred or optional skill Art means are that further limiting for another technological means is outer, can form several different technical solutions in any combination.

Claims (9)

1. a kind of shell-and-tube smoke heat replacing device, it is characterised in that including lateral shell and be arranged intracorporal several in the shell Lateral heat exchanger tube, in a tubular form, air inlet side and out gas side are equipped with closed tube sheet, the tube sheet and the shell to the shell The inner wall of body is tightly connected, and several baffle plates are equipped between the tube sheet, and the heat exchanger tube passes through on the baffle plate of corresponding site Pore, the pore of inlet end and air inlet side tube sheet is tightly connected, and the pore of outlet side and outlet side pipe plate is tightly connected, institute It states and several inner rib plates is distributed on the inner wall of heat exchanger tube, the both ends of the shell are equipped with flue connector, and the flue connector is served as reasons To circular reducing connecting tube, the flue connector includes rectangular section matched with flue and matches with the shell rectangle Circle segments, described rectangular section is connect with the circle segments by conical section and junction rounding off, the aperture of flue are greater than The aperture of the shell, the conical section of the flue connector form the spray orifice form shunk.

2. shell-and-tube smoke heat replacing device according to claim 1, it is characterised in that the distribution mode of the inner rib plate is Multiple rows of along being divided axially into, the quantity positioned at the inner rib plate of same row is multiple and is circumferentially uniformly distributed.

3. shell-and-tube smoke heat replacing device according to claim 2, it is characterised in that the inner rib plate of adjacent row is in week Upward stagger arrangement distribution.

4. shell-and-tube smoke heat replacing device according to claim 3, it is characterised in that the inner rib plate be flute profile or tooth form, Its windward side tilts backwards.

5. shell-and-tube smoke heat replacing device according to claim 1,2,3 or 4, it is characterised in that the baffle plate is perpendicular lacks The notch of type baffle plate, adjacent baffle is contrary.

6. shell-and-tube smoke heat replacing device according to claim 5, it is characterised in that the air side of the shell and air inlet Side is equipped with heat-absorbing medium interface, space in the pipe between heat-absorbing medium orifice inlet side tube sheet and air side tube sheet.

7. shell-and-tube smoke heat replacing device according to claim 6, it is characterised in that the shell is equipped with for detecting The temperature sensor and pressure sensor of the medium temperature and pressure in each tube side section separated by baffle plate.

8. shell-and-tube smoke heat replacing device according to claim 7, it is characterised in that the shell is cylindrical, both ends Be equipped with the reducing connecting tube connected for same rectangular duct, the outer spout of the reducing connecting tube is in rectangle, by rectangle to Circular reducer is using smooth transition structure.

9. shell-and-tube smoke heat replacing device according to claim 8, it is characterised in that the lower part of the shell is equipped with bracket, The quantity of the bracket is two, respectively close to the front-end and back-end of the shell.