CN1018465B - Recovery apparatus by digesting waste gas to extract and separate raw black liquid - Google Patents

Abstract

The present invention provides a recovery device for boiling waste steam capable of extracting and separating raw black liquid, which relates to a separation technique for solid and liquid as well as steam and liquid, the processing of pulping waste steam and the recovery of the heat of the waste steam. The recovery device is composed of a rotary spherical digester, a liquid rotating device, a black liquor separator tank, a steam and liquid reactor, a heat exchanger, a heat recovery tank, etc., wherein an upper filter casing, a lower filter casing, an upper bent pipe, a lower bent pipe and a mixing chamber are arranged in the spherical body of the rotary spherical digester; jet flow is used for sucking and extracting raw black liquor; the separation of steam and liquid is realized through cyclone sedimentation. When the present invention is carried out, the boiling waste steam can be fully recovered, the treatment of malodour achieves a discharge standard, 30 to 40% of raw black liquor can also be extracted, and no energy consumption is increased in the whole technical process.

Description

Recovery apparatus by digesting waste gas to extract and separate raw black liquid

The recycling of waste steam cooking equipment that separates raw black liquid be can extract and the processing of solid vapor-liquid separation technology and slurrying waste vapour and the recovery of heat related to.

Directly extracting raw black liquid in the boiling vessel is the problem that the slurrying industry need solve for a long time, because it is higher that this black liquor recovery is worth, once the black liquor that produces in the wash engine was injected in the digester with the displacement high concentration black liquor according to JP60-104590 document record Japan, and be used for production technology with this method and can reduce steam consumption 40-50%.At present domestic have methods such as the band of employing pressure liquid and ball lower storage reservoir vacuum filtration to extract black liquor.Rotary spherical digester band pressure liquid is to adopt the low temperature valve of putting that will double-edged fine-toothed comb be housed in the ball to turn to the below that the black liquor pressurized is discharged, and stops discharge opeing and change the ball steam discharge when the ball internal pressure drops to 0.4MPa.Ball lower storage reservoir vacuum filtration is to adopt after the steam bleeding batch turning under the ball lower storage reservoir pond to extract black liquor with pump, more than these newer methods, complicated, the easy obstruction of technology, the enforcement difficulty is big, and the medium-sized and small enterprises of at present a large amount of slurrying industries take the steam bleeding discharge opeing to get the way of slurry, not only cause waste, and serious environment pollution and harm people's is healthy.

The objective of the invention is to utilize the pressure energy of boiling waste vapour, in rotary spherical digester release steam discharge, reach the purpose of in ball, separating raw black liquid outside extraction, the ball, simultaneously the boiling waste vapour is reached the recycling of effective improvement and heat energy, reduce the waste vapour environmental pollution.

The overall schematic of this equipment is seen accompanying drawing 1, the mixing chamber schematic diagram is seen accompanying drawing 2, vapour-liquid reactor schematic diagram is seen accompanying drawing 3, it can be divided into black liquid extraction, black liquid separation, boiling handles and reclaims three parts, the black liquid extraction part mainly refer in the rotary spherical digester 1 last filter bowl 2, go up bend pipe 3, following filter bowl 4, following bend pipe 5 and mixing chamber 6.Upper and lower filter bowl is 180 ° and is arranged symmetrically in the rotary spherical digester inwall, is connected with mixing chamber 6 by upper and lower bend pipe.Mixing chamber 6 wherein is made up of last elbow 6-1, positioning pipe 6-2, following elbow 6-3, tapering pipe 6-4 and accelerating tube 6-5.The top diameter of accelerating tube 6-5 is generally the 0.6-0.8 of diameter at butt end, and the media outlet end of last elbow 6-1 inserts down in the elbow 6-3 tube chamber, forms Y shape structure, up and down the port of export central axis of elbow all with the positioning pipe central axes.Also can save accelerating tube in addition, allow elbow prolong insert down in the elbow tube chamber, these two kinds of structures can be selected in implementing.

The black liquid separation part mainly is made of two movable flow devices 9 at black liquid separation groove 11 and two ends, it is communicated with by the water sealing (sealing water) pipe in technology water conservancy diversion elbow 10 and the groove 12, the medium inlet end of the blast pipe of movable flow device 9 internal upper part central axis is a pyramidal structure, and tapering is between 0.8: 1 to 1: 1.

The waste vapour recovery section is mainly by vapour-liquid reactor 16, vapor-liquid separation groove 17, heat energy reclaiming groove 18 and heat exchanger 19 are formed, and vapour-liquid reactor 16 mainly is made up of accelerating tube 16-1, variable section diffuser 16-2, trunnion 16-3, feed tube 16-4, turbulated tube 16-5 and anemostat 16-6, and its structure is seen accompanying drawing 3.Variable section diffuser 16-2 gos deep into the 1/3-1/4 that trunnion is about length of throat, and the assembly that can be made into different taperings is with flexible craft.Vapor-liquid separation groove 17 is an enclosed type metal trough-shaped container, top and vapour-liquid reactor 16 are communicated with, 180 ° of elbow 17-1 are set in the groove, port down, wherein an end communicates with outside draining connector 17-2, and other end actinal surface is about the distance of the 20-30% of cell body total height from groove bottom, is provided with flow guiding screen 18-1 and heat exchanger 19 in the heat energy reclaiming groove 18, this is known and conspicuous equipment, no longer describes in detail.

Narrate the boiling waste vapour recovery technology that whole extraction separates raw black liquid below: boiling finishes, rotary spherical digester needs the release steam discharge, breakdown relief valve 7, the boiling waste vapour is by last filter bowl 2, last bend pipe 3 enters mixing chamber and sprays at a high speed through positioning pipe 6-2, and make mixing chamber 6 formation negative pressure make the raw black liquid that comes together in the rotary spherical digester bottom pass through filter bowl 4 down simultaneously, following bend pipe 5 enters mixing chamber, linking pipeline together with waste vapour by relief valve 7 and seal nipple 8 and technology then is tangential direction and enters two movable flow devices 9, waste vapour is separated with raw black liquid, and waste vapour enters upper pipe through the taper mouth of pipe and is delivered to the waste vapour recovery section.In addition, black liquor enters the black liquid separation groove along movable flow device 9 wall backspins through water conservancy diversion elbow 10, water sealing (sealing water) pipe 12.The part waste vapour that enters in the groove with black liquor then also imports the waste vapour recovery section by control valve 13 and pipeline.The waste vapour that top two parts are sent here enters in the vapour-liquid reactor 16 through three-way connection 14 major parts, being converted to aqueous water by waste vapour behind the heat absorption liquid turbulent-flow heat-exchanging of feed tube 16-4 injection discharges through 180 ° of elbow 17-1, because the effect of 180 ° of elbow 17-1 can be eliminated a large amount of foams that produce in anemostat 16-4 and the groove.For guaranteeing safety, technology valve 15 does not allow contract fully, and its effect also can be regulated the gas ratio that enters vapour-liquid reactor 16 and heat energy reclaiming groove 18 and the technological balance of overall network is regulated in addition.

In sum: the present invention is a suction power with the pressure conversion jet flow negative pressure of boiling waste vapour scientifically, the raw black liquid technology is extracted in the malleation press filtration that has changed prior art, like this, both solved original blockage problem, can make whole steam bleeding process can both extract raw black liquid again, the raw black liquid that slurry does not adsorb and part is adsorbed in the rotary spherical digester is proposed.Utilize liquid steam pressure energy and negative pressure-pumping power in the mixing chamber 6, the input piece-rate system, realize vapor-liquid separation through centrifugation and black liquor groove dilatation settlement action, waste vapour is handled and energy recovery through recovery system, raw black liquid can be done multiple processing and recovery, the dense high temperature raw black liquid allotment of this height cooking liquor, can save alkali and fall the steam consumption about 10%, and can improve the fibrous raw material penetrant action, raw black liquid can be made industry adhesive in addition, burns in agrochemical or other chemical products or the adding raw material etc., invention producer uses this equipment to extract and handled raw black liquid, improve the ambient atmosphere environment, reduced nuisance in this water, improved product quality simultaneously.

Invention producer implements by Fig. 1, with a 25m ³Rotary spherical digester, boiling raw material are cotton linter, bath raio 1: 3.6, and the black liquor of proposition accounts for 30% of total liquid measure, and the slurry moisture reduces about 9% than original, has not only controlled original black liquor outflow, has also administered airborne stench and has made the waste vapour heat obtain reclaiming.

Claims (5)

1, a kind of recycling of waste steam cooking equipment that can extract the separation raw black liquid, mainly by black liquid extraction, black liquid separation, the boiling waste vapour is handled three parts and is formed, on black liquid extraction partly includes and has in rotary spherical digester 1 and the spheroid, following filter bowl (2,4) and last, following bend pipe (3,5) and mixing chamber 6, black liquid separation partly mainly contains black liquid separation groove 11 and movable flow device 9, water conservancy diversion elbow 10 and water sealing (sealing water) pipe 12, boiling waste vapour processing section mainly comprises vapor-liquid separation groove 17 and vapour-liquid reactor 16 and heat energy reclaiming groove 18, it is characterized in that: in rotary spherical digester 1 spheroid, following filter bowl is on 180 ° of circumference that are arranged in the ball umbilical region, on, following bend pipe comes together in mixing chamber 6, movable flow device 9 is installed in the two ends of black liquid separation groove, its underpart communicates by the water sealing (sealing water) pipe 2 in water conservancy diversion elbow 10 and the black liquid separation groove, the medium inlet end of the blast pipe in the movable flow device 9 is a pyramidal structure, and 180 ° of elbows in the vapor-liquid separation groove 17 constitute sealing structure for water.

2, the recycling of waste steam cooking equipment that can extract the separation raw black liquid according to claim 1, it is characterized in that: mixing chamber 6 is made up of last elbow 6-1, positioning pipe 6-2, following elbow 6-3, tapering pipe 6-4 and accelerating tube 6-5, and last elbow 6-1 inserts down and forms Y shape structure in the elbow tube chamber.

3, the recycling of waste steam cooking equipment that can extract the separation raw black liquid according to claim 1, it is characterized in that: the gland steam exhauster bottoms in the movable flow device 9 are tapered structure, and tapering is generally between 0.8: 1 to 1: 1.

4, the recycling of waste steam cooking equipment that can extract the separation raw black liquid according to claim 1, it is characterized in that: vapour-liquid reactor 16 is made up of accelerating tube 16-1, variable section diffuser 16-2, trunnion 16-3, turbulated tube 16-5 and anemostat 16-6, and it is the 1/3-1/4 of length of throat that variable section diffuser gos deep into the trunnion tube chamber degree of depth.

5, the recycling of waste steam cooking equipment that can extract the separation raw black liquid according to claim 1 is characterized in that: be provided with the 20%-30% distance that 180 ° of elbow 17-1, medium inlet end face and bottom land keep accounting for the cell body total height in the vapor-liquid separation groove 17.

Images