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CN-224227550-U - Paper machine drier heat recovery device based on gas-steam double circulation

CN224227550UCN 224227550 UCN224227550 UCN 224227550UCN-224227550-U

Abstract

The utility model discloses a paper machine drying part heat recovery device based on gas-steam double circulation, and relates to the technical field of energy conservation in the paper industry. Aiming at the problems of direct discharge of high-temperature wet waste gas and high energy consumption of a paper machine drying part, the utility model provides the gas-steam double-circulation waste heat recovery device. The device is composed of an exhaust gas outlet vertical pipe, a cyclone dust collector, an evaporation heat exchange pipe, a compressor, an oil separator, a condenser, a connecting pipe, a flash tank, a waste heat recovery pipe, a preheater, a circulating air pipeline and the like in sequence, converts the latent heat of the exhaust gas into 0.2MPa secondary steam and 70 ℃ circulating hot air through closed loops of dust removal, evaporation, compression, condensation and flash evaporation, and synchronously preheats fresh air and cooling water.

Inventors

  • XU YOUBIN
  • YU ZHU
  • YIN YONGJUN
  • ZHANG LIANG
  • ZHOU JIAN

Assignees

  • 湖南晟明环保科技有限公司

Dates

Publication Date
20260512
Application Date
20250712

Claims (6)

  1. 1. The utility model provides a paper machine drier heat recovery device based on gas-steam dual cycle, includes cyclone (1), compressor (4), flash tank (8), waste heat recovery pipe (9), wherein cyclone (1) are located the low reaches of waste gas outlet riser (2) and communicate with waste gas outlet riser (2) through the flange, the bottom of cyclone (1) is equipped with ash discharging valve (3), the lateral wall of cyclone (1) communicates heat exchange tube (6) through sealed pipeline, compressor (4) are connected through the breathing pipe to the lower extreme of heat exchange tube (6), the exhaust end of compressor (4) communicates condenser (5) through high-pressure pipeline, the water outlet end of condenser (5) communicates flash tank (8) through connecting pipe (7), the export of flash tank (8) communicates waste heat recovery pipe (9) through horizontal pipeline, the lower extreme fixed connection pre-heater (10) of waste heat recovery pipe (9), and wherein the section is equipped with paper machine drier's air intake through circulating air pipeline (11), top (9) are equipped with two air-out devices (13) respectively, top (14) are blown and are equipped with pulse recovery valve (13), and a motor (15) and a pressure gauge (16) are respectively arranged above the pulse blowing device (14).
  2. 2. The heat recovery device for the drying part of the paper machine based on gas-steam double circulation according to claim 1, wherein the cyclone dust collector (1) is integrally formed by an upper cylinder section and a lower cone section, the inner diameter of the upper cylinder section is phi 450mm, and the cone angle of the lower cone section is 50 DEG + -2 DEG and is connected with the cylinder section through an annular butt weld.
  3. 3. The paper machine drying part heat recovery device based on gas-steam double circulation according to claim 1, wherein the high-pressure pipeline further comprises an oil separator, one end of the oil separator is connected with an exhaust port of the compressor (4) through a protruding surface flange of DN65 and PN2.5, and the other end of the oil separator is connected with an inlet of the condenser (5) through a flange of the same specification.
  4. 4. The paper machine drying part heat recovery device based on gas-steam double circulation according to claim 1 is characterized in that the flash tank (8) is of an upright cylinder structure, the inner diameter phi of the cylinder body is 600mm, the height is 1600mm, two injection interfaces with internal threads G1-1/2'' are symmetrically arranged at the top of the cylinder body, and the pulse injection device (14) is in sealing connection with the injection interfaces through threaded ports.
  5. 5. The heat recovery device for the drying part of the paper machine based on gas-steam double circulation according to claim 1 is characterized in that a plurality of temperature measurement and pressure measurement short pipes are welded and arranged on the waste heat recovery pipe (9) along the axial direction at intervals of 500mm, and each short pipe has external screw thread specification of M20×1.5 and is internally embedded with a K-type thermowell.
  6. 6. The heat recovery device of the paper machine drying part based on gas-steam double circulation according to claim 1, wherein the preheater (10) is a U-shaped tube bundle heat exchanger with a shell side diameter phi of 350mm, a shell of the preheater is connected with the lower end of the waste heat recovery tube (9) through a 45-degree steel elbow and flat welding flanges DN150 and PN1.6, and the tube bundle is a red copper U-shaped tube with an outer diameter phi of 19mm and a tube distance of 25 mm.

Description

Paper machine drier heat recovery device based on gas-steam double circulation Technical Field The utility model relates to the technical field of energy conservation in the paper industry, in particular to a paper machine drying part heat recovery device based on gas-steam double circulation. Background In modern high-speed paper machine, the drying part adopts saturated steam to heat the drying cylinder to evaporate the water content of the paper web, the steam consumption accounts for more than 60% of the energy consumption of the whole production line, and the high-temperature wet waste gas carried out along with the paper web is directly discharged into a vehicle or is discharged outdoors through a simple air duct, so that a great amount of sensible heat and latent heat are wasted, and the humidity and corrosion risk of a production workshop are increased. The existing dryer structure device (publication number: CN 207047604U) of the dryer of the paper machine has the following defects and needs to be further improved. The traditional heat recovery of the drying part mostly adopts a single gas heat exchange or heat pump system, wherein the gas heat exchanger only can utilize the high-temperature sensible heat of the waste gas, and is difficult to recover the latent heat; Although the single-cycle heat pump can raise the temperature for heating, the equipment efficiency is low, the operation and maintenance are frequent because the temperature difference at the evaporation side is too small and the heat exchanger Yi Jielou is scaled, and the low-pressure steam suitable for the drying cylinder and the fresh air hot air suitable for the gas hood are difficult to synchronously output, so that the double requirements of greatly reducing the steam consumption and improving the workshop environment cannot be met. Disclosure of utility model The utility model mainly aims to provide a paper machine drying part heat recovery device based on gas-steam double circulation, which can effectively solve the problems in the background technology. The technical scheme includes that the paper machine drying part heat recovery device based on gas-steam double circulation is characterized in that a cyclone dust collector is located at the downstream of a waste gas outlet vertical pipe and is communicated with the waste gas outlet vertical pipe through a flange, an ash discharging valve is arranged at the bottom of the cyclone dust collector, the side wall of the cyclone dust collector is communicated with a heat exchange pipe through a sealing pipeline, the lower end of the heat exchange pipe is connected with a compressor through an air suction pipe, the air discharging end of the compressor is communicated with a condenser through a high-pressure pipeline, the water outlet end of the condenser is communicated with a flash tank through a connecting pipe, the outlet of the flash tank is communicated with a waste heat recovery pipe through a transverse pipeline, the lower end of the waste heat recovery pipe is fixedly connected with a preheater, the middle section of the waste heat recovery pipe is communicated with an air inlet of a paper machine drying cover through a circulating air pipeline, a pressure relief valve and an air exhaust hole are respectively arranged at the top of the waste heat recovery pipe, two pulse spraying devices are arranged at the tops of the flash tank, and a motor and a pressure gauge are respectively arranged above the pulse spraying devices. Preferably, the cyclone dust collector is formed by integrally forming an upper cylinder section and a lower cone section, wherein the inner diameter of the upper cylinder section is phi 450mm, and the cone angle of the lower cone section is 50 degrees+/-2 degrees and is connected with the cylinder section through an annular butt weld. Preferably, the high-pressure pipeline further comprises an oil separator, one end of the oil separator is connected with the exhaust port of the compressor through a convex surface flange of DN65 and PN2.5, and the other end of the oil separator is connected with the inlet of the condenser through a flange with the same specification. Preferably, the flash tank is of an upright cylinder structure, the inner diameter phi of the cylinder body is 600mm, the height is 1600mm, two injection interfaces with internal threads G1-1/2'' are symmetrically arranged at the top of the cylinder body, and the pulse injection device is in sealing connection with the injection interfaces through threaded ports. Preferably, the waste heat recovery pipe is welded along the axial direction at intervals of 500mm and provided with a plurality of temperature measurement pressure taking short pipes, and the external thread specification of each short pipe is M20×1.5 and embedded with a K-type thermowell. Preferably, the preheater is a U-shaped tube bundle heat exchanger with the shell side diameter phi of 350mm, the shell of the heat exchanger is c