According to its structure, standard heat exchanger can be divided into three categories: air-cooled heat exchanger, plate heat exchanger, tube heat exchanger, seal gasket of Shandong heat exchanger, expression method of standard heat exchanger model, standard heat exchanger can be divided into three categories according to its structure: air-cooled heat exchanger, plate heat exchanger, tube heat exchanger 1, air-cooled heat exchanger 1 Air flow part: blast air cooler (horizontal type and inclined top type); The tube bundle types of induced draft air cooler are: the tube bundle of plug type tube box, the tube bundle of detachable cap type tube box, the tube bundle of detachable cap type tube box and the tube bundle of header type tube box; Fan drive type: V-belt drive; Gear box reducer transmission; Direct drive of motor; Suspended V-belt drive, motor axial up; Suspended V-belt drive, motor axial lower shutter type: Shandong heat exchanger gasket manual adjustment shutter; Automatic adjustment shutter 2 Form and code of each part type and code of tube bundle type and code: Table 1 type code of tube bundle type box type code of finned tube type code of blast horizontal tube bundle GP plug type tube box s L type finned tube l inclined top tube bundle x removable cover plate tube box K1 double L type finned tube ll induced draft horizontal tube bundle YP removable cap type tube box K2 knurled finned tube KL header J bimetal rolled fin Finned tube Dr inlaid finned tube G 3. Expression method of tube bundle model: base tube heat exchange area m2 number of tube rows nominal size of tube bundle: length × Number of tube passes with width m, finned ratio / design pressure of finned tube type, MPa, tube box type, tube bundle type, 4. Expression method of fan type, 5. Expression method of frame type, 6. Expression method of sealing gasket of louver type heat exchanger, blade type and impeller diameter × ten × 10mm air volume regulation mode motor power fan transmission mode blade number ventilation mode frame nominal size long × Width (length for inclined roof frame) × wide × Inclined side length (m), open (closed) type air box type fan diameter × 10mm / set, frame type, nominal size, length × Width, m adjustment mode 7. Expression method of air cooler model: 2. Plate heat exchanger: 1. Common plate corrugated form code: Table 2 serial number corrugated form code 1 herringbone corrugated R 2 horizontal straight corrugated p 3 spherical corrugated Q 4 inclined corrugated x 5 vertical corrugated s 2 Common frame form codes: Table 3 serial number frame form code 1 double support frame type I 2 double support frame type II 3 three Shandong heat exchanger gasket support frame type III 4 cantilever type IV 5 ejector type V 6 ejector type with intermediate diaphragm type VI 7 movable compression plate floor type VIII shutter type, nominal size / number of frame type, Nominal size, open (closed) type / span, fan type, impeller diameter × ten × 10, mmm / number, tube bundle type, nominal size / piece number 3. Expression method of plate heat exchanger model 3. Tube heat exchanger: this expression method is applicable to horizontal and vertical heat exchangers. Frame structure code gasket material code heat exchanger heat exchange area design pressure veneer nominal heat exchange area plate corrugated form code plate heat exchanger code ××× Dn-pt / ps-a-ln / d-nt / NS I (or II) is made of carbon steel and low alloy steel cold drawn steel tubes. The tube bundles are divided into I and II types. The first grade tube bundle is made of * *, * *, cold drawn steel tubes, and the second grade is made of ordinary cold drawn steel tubes. The number of tube / shell side, in case of single shell side, only write NT. Ln - nominal length of heat exchange tube (m), D - outer diameter of heat exchange tube (mm). When Al, Cu and Ti heat exchange tubes are used, the material symbol should be added after ln / D, such as ln / D and Cu. Nominal heat exchange area (M2). Design pressure of tube / shell side (MPA), when the pressure is equal, only write Pt. The nominal diameter (mm) is expressed as a fraction for the kettle type RE whisk. The numerator is the diameter in the tube box and the denominator is the inner diameter of the cylinder** The first letter represents the type of front-end Tube Box * * the second letter represents the type of shell type, and the third letter represents the type of back-end structure