CN207176392U - A kind of paper machine gas hood tail gas condensing water EGR - Google Patents

A kind of paper machine gas hood tail gas condensing water EGR Download PDF

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Publication number
CN207176392U
CN207176392U CN201720527871.8U CN201720527871U CN207176392U CN 207176392 U CN207176392 U CN 207176392U CN 201720527871 U CN201720527871 U CN 201720527871U CN 207176392 U CN207176392 U CN 207176392U
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CN
China
Prior art keywords
wet
circulation evaporator
central circulation
hot steam
heat exchanger
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Application number
CN201720527871.8U
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Chinese (zh)
Inventor
李明辉
刘滨朝
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陕西科技大学
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Priority to CN201720527871.8U priority Critical patent/CN207176392U/en
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Publication of CN207176392U publication Critical patent/CN207176392U/en

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Abstract

A kind of paper machine gas hood tail gas condensing water EGR, including heat exchanger, heat exchanger upper end are respectively arranged with wet-hot steam import and are respectively arranged with dry hot air outlet with drying inlet of cold air, heat exchanger lower end and are exported with wet-hot steam;Wet-hot steam import is connected by adjustable heat pump with the gas outlet of gas hood, and the wet-hot steam gas outlet of exchanger base is connected in the heating chamber of Central circulation evaporator by water circulating pump one;Gas into heating chamber enters vaporization chamber all the way, and another way enters vapour compression machine by the flash tank with being connected below Central circulation evaporator, and the circulation of vapour compression machine gas outlet is connected in heating chamber;Central circulation evaporator is from top to bottom disposed with shower nozzle, vaporization chamber and heating chamber;Condensed water is connected on vaporization chamber by water circulating pump three caused by Central circulation evaporator bottom;Adjustable heat pump is connected by pipeline at the top of Central circulation evaporator, the utility model has the characteristics of simple in construction, efficient.

Description

A kind of paper machine gas hood tail gas condensing water EGR

Technical field

Pulp and paper technology field is the utility model is related to, more particularly to a kind of paper machine gas hood tail gas condensing water recycling dress Put.

Background technology

China's pulp and paper industry scale is increasing, up-to-dateness more and more higher, but the behind maximum discharge of high yield Amount, highly energy-consuming turn into the focus of people's growing interest.Paper-making industry sustainable development, energy-saving and emission-reduction are just particularly important.

The delay of caused damp-heat air in Dryer Section of Paper Machine closing gas hood, the energy that page evaporation moisture is taken away can be reduced Power, cause rate of drying to occur downward trend because of the reduction of evaporation rate, and be directly discharged to outdoor but caused damp and hot Contained amount of heat causes to waste in air.

The content of the invention

In order to solve the above problems, the utility model provides a kind of paper machine gas hood tail gas condensing water EGR, leads to Cross the wet-hot steam of heat exchanger, caused condensed water and the relatively low vapours of quality, Central circulation evaporator and pressure can be passed through Contracting machine is recycled to steam condensate (SC), and additional steam is not needed during condensate evaporation, only with a small amount of electric energy come Driving compressor obtains more heat energy, so as to reduce the demand to environment's heat, wet-hot steam that will be discharged out of gas hood Veritably accomplish that energy utilization maximizes, there is the characteristics of simple in construction, efficient.

To achieve the above object, the technical solution adopted in the utility model is:

A kind of paper machine gas hood tail gas condensing water EGR, including heat exchanger 2, the described upper end of heat exchanger 2 are set respectively Wet-hot steam import is equipped with drying inlet of cold air, the lower end of heat exchanger 2 is respectively arranged with dry hot air outlet 3 and damp and hot steaming Vapor outlet 4;

Wet-hot steam import is connected by adjustable heat pump 1 with the gas outlet of gas hood, the wet-hot steam outlet of the bottom of heat exchanger 2 4 are connected on the heating chamber inlet 6 of Central circulation evaporator 15 by water circulating pump 1;Into heating chamber 11 gas all the way Into vaporization chamber 13, another way enters vapour compression machine 10 by the flash tank 9 being connected with the lower section of Central circulation evaporator 15, steams The circulation of the gas outlet of vapour compressor 10 is connected in heating chamber 11;

Described Central circulation evaporator 15 is from top to bottom disposed with shower nozzle 14, vaporization chamber 13 and heating chamber 11;

Condensed water caused by the bottom of Central circulation evaporator 15 is connected on vaporization chamber 13 by water circulating pump 3 12;

The described top of Central circulation evaporator 15 connects adjustable heat pump 1 by pipeline.

The nozzle 16 of heat pump is provided between described adjustable heat pump 1 and gas hood.

Pneumatic operation valve 17 is provided with described adjustable heat pump 1.

The described lower section of flash tank 9 is provided with condensate water discharging valve 8, and water circulating pump two is provided with condensate water discharging valve 8 7。

The beneficial effects of the utility model:

Wet-hot steam in gas hood is used for heat exchanger by the utility model, and heating is supplemented fresh dry in gas hood by pressure fan The heat and quality of dry air, improve the utilization rate of wet-hot steam energy, and reduce the moisture in closing gas hood air, Page evaporation rate is improved, and then improves the production capacity and paper page drying position quality of paper machine, passes through the damp and hot steaming of heat exchanger Vapour, caused condensed water and the relatively low vapours of quality, can be by Central circulation evaporator and compressor to steam condensate (SC) Recycled, additional steam is not needed during condensate evaporation, only drive compressor with a small amount of electric energy to obtain More heat energy, so as to reduce the demand to environment's heat, the wet-hot steam discharged out of gas hood is veritably accomplished into energy profit With maximization.

Brief description of the drawings

Fig. 1 is the utility model structure diagram.

Embodiment

The utility model is elaborated below in conjunction with the accompanying drawings.

As shown in Figure 1:Wet-hot steam and indirect steam caused by Central circulation evaporator are right in the presence of adjustable heat pump Drying cold air in heat exchanger is heated.Vapours is dried caused by heat exchanger to be sent in the gas hood of paper machine closing, and Caused high-temperature condensation water, which is sent in Central circulation evaporator, to be recycled.High temperature in Central circulation evaporator is cold Condensate turns into indirect steam by the heating evaporation of vaporization chamber, and remaining condensed water is discharged Central circulation evaporator and enters flash distillation Tank carries out vapor-liquid separation, and the pressure and temperature of its steam is improved by vapour compression machine, and for heating what is come from heat exchanger High-temperature condensation water.

Circulating and evaporating is carried out to condensed water caused by Central circulation evaporator by flash tank and vapour compression machine.

Volume compression is carried out by the vapour compression machine steam relatively low to quality caused by flash tank, so as to quickly improve The pressure and temperature of steam, and be not passed through live steam again and save heat.

Indirect steam caused by Central circulation evaporator with out of gas hood directly caused by wet-hot steam in adjustable heat pump Mixed, and when working condition changes, can go to change the horizontal stroke at the nozzle of adjustable heat pump by pneumatic operation valve Sectional area, so as to obtain bigger mass ratio of induced-to-inducing air.

In recycled offgas condensed water evaporator, the condensed water in flash tank can pass through condensate water discharging valve and recirculated water Pump two is passed out among boiler, to control liquid level in flash tank, so as to keep the efficiency of vapor-liquid separation in flash tank.Condensed water is arranged Water valve carries out de-regulation, and water circulating pump two carries out thin tuning.

Heat exchanger is added in the dilution air plant of traditional paper machine closed hood, goes lifting to be inhaled from the external world with wet-hot steam The quality and temperature of the drying cold air entered, heat exchanger heat exchange efficiency will be lifted by the arrangement in heat exchanger internal steam pipe road, carried The high direct conduction surface of steam, maximizes thermal conductivity.

Wet-hot steam is by producing quality relatively low wet-hot steam and condensed water after heat exchanger, by the recirculated water in exit Pump one sucks center and followed in evaporator heating chamber.Condensed water passes through Central circulation evaporator by evaporation, the higher steam of quality Into vaporization chamber, and then turn into secondary wet-hot steam;The low steam of quality and condensed water are laggard by the steam-water separation of flash tank Enter vapour compression machine, its temperature can be lifted therewith after compressing thin vapour volume, so that the steam of low-temp low-pressure becomes high The vapours of warm high pressure, make it to go heating to need the condensed water evaporated as thermal source again, steaming is recycled so as to reach The purpose of vapour.

The condensed water of evaporator bottom is extracted out, passed through by water circulating pump by condensed water caused by Central circulation evaporator Shower nozzle in vaporization chamber reenters evaporator heating chamber (position) and carries out circulating-heating evaporation.

Entered by the indirect steam of Central circulation evaporator because pressure and temperature is relatively low, it is necessary to add adjustable heat pump, By the quality and pressure of adjustable heat pump fast lifting indirect steam, and reduce indirect steam and directly mix, because energy turns Change and caused energy dissipation.The wet-hot steam come from gas hood is passed through into the nozzle of adjustable heat pump, wet-hot steam flow speed wink Between lifted, pressure reduce, nozzle exit formed negative pressure band.In this region, the less indirect steam of pressure and temperature because Pressure differential is inhaled into adjustable heat pump, high steam compression and low pressure steam while expansion, is improved with the abundant pressure of high steam The quality of low-pressure steam, for mixed steam after the pressure loss is recovered, supply heat exchanger heats the drying cold air newly entered.

The major influence factors for influenceing the jet coefficient of adjustable heat pump are the structures of paper machine working condition and heat pump itself Design, when paper machine working condition changes, working steam is that the pressure of gas hood wet-hot steam improves, it will makes heat pump nozzle The negative pressure at place is reduced so that the ability of driving fluid reduces;And when working steam reduces, it is impossible to which formation effectively volleys energy Power, and the pressure in heat pump exit is relatively large, and may result in heat pump fluid can not normally work.Pass through pneumatic operation Valve promotes connecting rod so as to change sectional area at heat pump nozzle, to change working steam passes through the fluid velocity and pressure at nozzle Drop, so as to increase the mass ratio of induced-to-inducing air of heat pump.

The liquid level of flash tank is chain, and when paper machine operating mode changes, caused wet-hot steam increases in gas hood, substantial amounts of cold Condensate enters in flash tank, the characteristics of being not easy to emit for flash distillation pot liquid, if alone condensate water discharging valve is put It is excessively slow to go out the speed of condensed water, easily causing condensed water overfill in flash tank, flash evaporation effect reduction etc. influences, and uses condensed water Pump frequency conversion controls, and can cause the frequent start-stop of water pump, easily cause the damage of equipment.Arranged using water circulating pump 27 and condensed water Water valve chain control goes to avoid this undesirable element.Small model is carried out to liquid level in flash tank by PID by condensate water discharging valve Enclose regulation so that level stability is in a certain setting value;When paper machine working condition changes, liquid level is drastically lifted in flash tank, When reaching the liquid level upper limit, condensate water discharging valve PID is transferred to manually, and makes up to full-gear, and opens condensation Water pump, after liquid level in flash tank is rapidly reduced into lower limit, stops water circulating pump two and work, condensate water discharging valve PID regulations It is adjusted to automatically, section is finely adjusted to liquid level in flash tank.

In paper machine closing gas hood at nozzle of the high temperature wet-hot steam by adjustable heat pump, because the lifting of speed, pressure Reduce so that nozzle exit forms the state of negative pressure, jetting steam caused to pass through indirect steam caused by Central circulation evaporator Adjustable heat pump is sucked into, after the mixing chamber progress pressure of adjustable heat pump, temperature mixing, passes through vapor (steam) velocity in diffuser casing Reduce to recover the loss of pressure, and enter the wet-hot steam air inlet of heat exchanger.

Operation principle of the present utility model:

In heat exchanger 2, by the heating of wet-hot steam, the temperature from the extraneous drying cold air sucked is improved, and Drying hot-air after heating is blown into the gas hood of paper machine, to increase the temperature in gas hood and reduce humidity, so as to improve Machine dried page moisture evaporation rate, at the outlet 4 of the wet-hot steam of heat exchanger 2, by water circulating pump 1 by heat exchanger 2 Caused condensed water is pumped into the heating chamber 11 of Central circulation evaporator 15.In heating chamber 11, condensed water is evaporated again, vapour Steam after water separation turns into secondary wet-hot steam, and flows into the injecting chamber of adjustable heat pump 1, and caused condensation is evaporated in part Water, enter after leaving heating chamber 11 in flash tank 9, carry out gas-liquid separation;During partial condensation water is pumped into by water circulating pump 3 12 The vaporization chamber 13 of circulating evaporator 15 is entreated, circulating and evaporating is carried out to condensed water.The quality of caused indirect steam is too in flash tank 9 It is low, thus vapour compression machine 10 is used, the volume of indirect steam is reduced, to increase the pressure and temperature of steam so as to lead to again Enter in Central circulation evaporator 15, carry out evaporation condensed water and realize recycling for wet-hot steam energy.

Claims (4)

1. a kind of paper machine gas hood tail gas condensing water EGR, including heat exchanger (2), it is characterised in that described heat exchanger (2) upper end is respectively arranged with wet-hot steam import with drying inlet of cold air, and heat exchanger (2) lower end, which is respectively arranged with, dries heat sky Gas exports (3) and wet-hot steam outlet (4);
Wet-hot steam import is connected by adjustable heat pump (1) with the gas outlet of gas hood, the wet-hot steam outlet of heat exchanger (2) bottom (4) it is connected to by water circulating pump one (5) on the heating chamber inlet (6) of Central circulation evaporator (15);Into heating chamber (11) Gas enter vaporization chamber (13) all the way, another way is entered by the flash tank (9) with being connected below Central circulation evaporator (15) Enter vapour compression machine (10), the circulation of vapour compression machine (10) gas outlet is connected in heating chamber (11);
Described Central circulation evaporator (15) is from top to bottom disposed with shower nozzle (14), vaporization chamber (13) and heating chamber (11);
Condensed water caused by Central circulation evaporator (15) bottom is connected on vaporization chamber (13) by water circulating pump three (12);
Adjustable heat pump (1) is connected by pipeline at the top of described Central circulation evaporator (15).
2. a kind of paper machine gas hood tail gas condensing water EGR according to claim 1, it is characterised in that described is adjustable Heat pump (1) is provided with the nozzle (16) of heat pump between gas hood.
3. a kind of paper machine gas hood tail gas condensing water EGR according to claim 1, it is characterised in that described is adjustable Pneumatic operation valve (17) is provided with heat pump (1).
A kind of 4. paper machine gas hood tail gas condensing water EGR according to claim 1, it is characterised in that described flash distillation Condensate water discharging valve (8) is provided with below tank (9), condensate water discharging valve is provided with water circulating pump two (7) on (8).
CN201720527871.8U 2017-05-12 2017-05-12 A kind of paper machine gas hood tail gas condensing water EGR CN207176392U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107151937A (en) * 2017-05-12 2017-09-12 陕西科技大学 A kind of tail gas condensing water circle device
CN108917372A (en) * 2018-05-21 2018-11-30 亚太森博(山东)浆纸有限公司 A kind of flash vapor system
CN109453876A (en) * 2018-10-26 2019-03-12 四川大学 Flow of superheated steam ultra-fine grinding tail gas condensing-boil closed loop process again

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107151937A (en) * 2017-05-12 2017-09-12 陕西科技大学 A kind of tail gas condensing water circle device
CN107151937B (en) * 2017-05-12 2019-10-11 陕西科技大学 A kind of tail gas condensing water circle device
CN108917372A (en) * 2018-05-21 2018-11-30 亚太森博(山东)浆纸有限公司 A kind of flash vapor system
CN109453876A (en) * 2018-10-26 2019-03-12 四川大学 Flow of superheated steam ultra-fine grinding tail gas condensing-boil closed loop process again
CN109453876B (en) * 2018-10-26 2020-05-26 四川大学 Condensation-reboiling closed circulation method for tail gas generated by ultrafine grinding of superheated steam

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20180403

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