# US 9,518,358 B2 · Assembly of nozzles and valves as discharge ports of a pressurized vessel and method for switching and replacing the nozzles and valves

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- Number: US 9,518,358 B2
- Document ID: US9518358B2
- Status: Granted
- Kind: B2
- Application number: 13/029,801
- Filed: 2011-02-17
- Published: 2012-08-23
- Granted: 2016-12-13
- Earliest claimed: 2011-02-17
- Assignees: Andritz Inc.
- Applicants: Thomas Pschorn; Bertil Stromberg; Peter Mraz
- Inventors: Thomas Pschorn; Bertil Stromberg; Peter Mraz
- Web page: https://patentgrep.com/patent/US9518358B2

## CPC

- D21C 7/08: Discharge devices
- B01J 4/002: {Nozzle-type elements (nozzle-type reactors B01J19/26)}
- B01J 2204/005: the outlet side being of particular interest
- D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

A discharge assembly including: a chamber having an sidewall extending around a perimeter of the chamber, an open upper region, an flange coupling at an upper region of the sidewall and extending around the upper region and a bottom, wherein the chamber receives a rotating impeller; a plurality of discharge openings in at least one of the sidewall and bottom of the chamber; a plurality of valves each coupled to one of the discharge openings, and a plurality of nozzles each coupled to one of the discharge openings and downstream in the opening to the valve for the opening.

## Claims

### Claim 1

A discharge assembly comprising:
a pressurized steam explosion vessel;
a chamber at a bottom of the pressurized steam explosion vessel, the chamber having a sidewall extending around a perimeter of the chamber, an open upper region, a flange coupling at an upper region of the sidewall and extending around the upper region and a bottom;
a plurality of discharge openings in the sidewall and the bottom of the chamber;
a plurality of valves;
a plurality of nozzles, wherein a nozzle is disposed in a housing coupled to one of the discharge openings, wherein the plurality of nozzles includes a first nozzle and a second nozzle having a greater flow capacity than the first nozzle; and
a pipe disposed downstream of each nozzle, wherein each pipe and each nozzle is configured to withstand a substantial change in internal pressure, such that steam explosion occurs, wherein each valve is disposed between the nozzle and the pipe, and wherein the plurality of nozzles each have an internal flow passage with a throat having a cross-sectional area different than that of the throat of at least one of the other nozzles.

### Claim 2 (depends on 1)

The discharge assembly of claim 1 wherein the valves are each an on-off valve having a full on position and a full off position, and lacking intermediate positions.

### Claim 3 (depends on 1)

The discharge assembly of claim 1 wherein the plurality of nozzles each have an internal passage with a venturi shape.

### Claim 4 (depends on 1)

The discharge assembly of claim 1 wherein the plurality of nozzles each have a replaceable nozzle liner.

### Claim 5 (depends on 1)

The discharge assembly of claim 1 wherein the plurality of nozzles are laval type nozzles.

### Claim 6 (depends on 1)

The discharge assembly of claim 1 wherein each of the openings receives an annular housing having a passage within which are mounted the valve and nozzle.

### Claim 7 (depends on 1)

The discharge assembly of claim 1 wherein the chamber further comprises a rotating impeller.