Digester for the production of batch sulfite pulp with a volume of 320m3

Content

1. Sulphate pulping mechanism 3

1.1. Indicators of sulfite cellulose Zh-3 3

1.2. Schematic diagram of sulfite pulp production.  The composition of cooking acid. Cooking schedule 4

2. Description of the design of the digester 10

2.1. Brief description of the principle of operation and design of the bimetallic digester 10

2.2. Scheme of the boiler with fittings 13

3. Selection of boiler body material. Structural calculations 14

3.1. Calculation of the volume of individual parts of the boiler: cylindrical, conical, toroidal transitions, boiler body scheme. Selection of the ratio of height to diameter of the boiler. 15

3.2. Calculation of the wall thickness of the cylindrical, conical and toroidal parts of the body 17

3.3. Calculation and assignment of the executive thickness of the walls of the upper and lower neck. 18

3.4. Calculation of hole reinforcement  19

3.5. Calculation of the thickness of the flange of the upper neck of the boiler, the diameter and number of bolts fastening the cover to the flange of the boiler, from the conditions of strength and density of the bolted connection.  21

3.6. Calculation of the thickness of the flat cover 25

3.7. Calculation of bolts fastening the blow elbow to the lower neck of the boiler, the thickness of the flange of the lower neck, taking into account the action of the reactive force on the bolt connection during blowing with a pressure of P = 0.3 MPa 26

Bibliography 28