CN202766913U - Paper for daily use single cylinder paper machine based on tail gas flow control and heat pump technology - Google Patents

Abstract

The utility model belongs to the technical field of papermaking equipment, and particularly relates to a paper for daily use single cylinder paper machine based on tail gas flow control and heat pump technology. The paper for the daily use single cylinder paper machine based on the tail gas flow control and the heat pump technology comprises a main drying cylinder and a control system. The paper for the daily use single cylinder paper machine based on the tail gas flow control and the heat pump technology is characterized in that the main drying machine is connected with a gas-liquid separator, after tail gas separated by the gas-liquid separator flows through a flow detecting device, the tail gas is compressed by an adjustable heat pump to be back into the main drying cylinder to recycle. The adjustable heat pump mainly comprises a movable device, a nozzle, a valve element, a pomum adami, a releaser, a tail gas inlet end and a middle-high pressure steam inlet end. The upper portion of the valve element is communicated with the middle-high pressure steam inlet end, the lower portion of the valve element is communicated with the tail gas inlet end, the front end of the valve element is connected with the nozzle, and the back end of the valve element is connected with the movable device. Middle-pressure steam flows from the middle-high pressure steam inlet end into the valve element and is ejected from the nozzle. And at the same time, a negative pressure formed in an outlet of the nozzle of the ejection of the middle-high pressure steam draws in the tail gas at the tail gas inlet end. The middle-high pressure steam and the tail gas are compressed in the pomum adami, and after the releaser increases the pressure, the middle-high pressure steam and the tail gas are ejected through the outlet. The paper for the daily use single cylinder paper machine based on the tail gas flow control and the heat pump technology solves the water draining problem, and solves another problem that the recycle of the tail gas and flashing steam, wherein the tail gas and the flashing steam are ejected as condensed water is ejected. And at the same time, the discharge of non-condensable gases in a system and the recycle of residual quantity of heat in condensed water are solved, and therefore steam consumption of the paper machine can be reduced to the utmost, and energy-saving and consumption-reducing purposes can be achieved to the utmost.

Description

Paper for daily use single cylinder paper machine based on the control of tail steam flow amount and heat pump techniques

Technical field

The utility model belongs to the paper making equipment technical field, is specifically related to a kind of paper for daily use single cylinder paper machine based on the control of tail steam flow amount and heat pump techniques.

Background technology

In field of papermaking, low grammes per square metre paper for daily use mainly refers to the grammes per square metre scope at 11-15g/m ²Paper because grammes per square metre is very low, thus paper dried easily, so often this type of paper machine only disposes 1 diameter and just can realize drying to paper at 2500mm, the fabric width drying cylinder about 2000mm.

Exist the low speed of a motor vehicle paper for daily use paper machine of a large amount of low grammes per square metres of this type of single cylinder paper machine speed below 300m/min in China, every day, the production capacity of separate unit machine productive life paper using only was 5-6 ton paper/sky.

This type of paper machine generally adopts drain valve to come the central condensed water that produces at drying cylinder of discharged steam dry paper process, some or even directly the discharging, caused the huge steam wasting of resources, so that the steam consumption of producing one ton of this type of low grammes per square metre paper for daily use is in 4.8-5.5 ton steam/sky, slightly low winter in summer is higher.

Utilizing tail steam flow amount to control heat pump techniques through us should be after the unit of reality be transformed, the ton paper gas consumption of the single cylinder paper machine of a daily output about 5 tons is reduced to 3.5 tons/day by 5.5 tons/day, be equivalent to reduce every day 10 tons/day steam consumption, the production cost of one ton of steam is in 150 yuan/tons, so can reducing steam consumption every day, the separate unit machine is worth 1500 yuan, if the separate unit machine just can save production cost 510,000 yuan according to production calculating in 340 days in 1 year.

Tradition single cylinder paper machine vapour system collocation form is illustrated in fig. 1 shown below, and there is following several problem in this type of vapour system configuration, causes steam consumption very high, is summarized as follows:

1, this type of vapour system often adopts the Pressure gauge that arranges above by observation steam inlet pressure piping, and the manual adjustments air intake valve is regulated what of amount of the steam that enters drying cylinder.The whole usefulness gas in paper mill is not a stable situation, steam came atmospheric pressure higher when whole station-service tolerance was low, steam came atmospheric pressure lower when whole station-service tolerance was high, so be the state that is in a fluctuation all the time with atmospheric pressure, can't predict and to control, so obviously can't satisfy constant drying capacity by hand valve regulation admission pressure, it is excessive to cause Paper Moisture to change, sometimes even because come atmospheric pressure to reduce too much, do not have enough time out large air intake valve and cause paper to dry and disconnected paper.

2, adopt the drain valve draining can't properly settle the problem that the trap leaking amount is large, incondensable gas adds up easily in drying cylinder.The drain valve of hot power is the row's of being with fixed gas device not, causes incondensable gas to add up in drying cylinder, causes the reduction of the drying cylinder thermal efficiency, and it is stifled on-the-spot and can't draining assemble to form on drain valve top simultaneously gas.The drain valve inside of float-ball type is with a bimetallic exhaust outlet, and service time one, long hair was given birth to the Probability maximum of fault, became soon normally open, had increased steam leakage.

3, the drying cylinder heat transference efficiency is had several main influence factors: the wall thickness of drying cylinder, the clean-up performance of dryer surface, be exactly in addition in the drying cylinder condensed water what etc.In the middle of these several major influence factors, what have the greatest impact is exactly what of condensed water in the drying cylinder, and condensed water is more, and to transmit transfer efficiency just lower for heat in the drying cylinder.The design of tradition single cylinder paper machine vapour system can't be satisfied in time unimpeded drainage requirement, causes the interior condensed water of drying cylinder too much, and greatly reduces the use amount that heat transference efficiency increases steam.Because come draining by drain valve in the middle of traditional Steam System Design, and the drain valve drainability is the situation of change that can't tackle condensed water generation in the drying cylinder of fixing.Because the drainability of drain valve is subject to the restriction of drain valve size, the starting differential pressure of the larger needs of displacement is larger, the leakage rate of the larger steam of displacement also can be larger simultaneously, so can unconfined amplification displacement when selecting drain valve, after type selecting is determined, the displacement of drain valve is exactly a fixing numerical value, just means that also drainability is certain.In the middle of the paper dry run, be subject to the impact of the factors such as the variation of paper mass dryness fraction, steam inlet pressure oscillation, often the admission pressure of drying cylinder is to be under the situation about constantly changing.When operating pressure changed, the variation of the condensed water generation in the drying cylinder was not equal proportion, but growth at double.

As shown in Figure 2, when operating pressure is increased to moment of 2.1bar from 1.7 bar, the condensation water quantity that produces in the drying cylinder is from 0.5m3, and moment is increased to about 1 m3.When operating pressure is increased to moment of 2.7bar from 1.7 bar, the condensation water quantity of output can be from 0.5m3 in the drying cylinder, and moment is increased to about 2m3.If the condensed water that these increase moments can in time be discharged, when reaching a new thermal equilibrium state under the operating pressure that drying cylinder is inherent new after 4 minutes, the generation of condensed water can tend towards stability again, and is slightly high during just than 1.7bar greatly.Because when drying cylinder is under the 1.7bar admission pressure, drying cylinder is in a thermally equilibrated state, when the paper mass dryness fraction inadequate, we will improve the drying cylinder admission pressure and then improve surface temperature of drier, we at first need to pass into a large amount of steam and come this large cast iron of heated drying cylinder, after being heated to our needed temperature, the temperature of drying cylinder just can bring paper heat, the process that drying cylinder heats up compares very fast, so can produce the condensed water of several times moment, when treating that surface temperature of drier is stabilized under the new operating pressure, the generation of condensed water just can tend to be steady.

So the condensed water that produces when the drying cylinder admission pressure changes becomes how much several grades of variations, the fixing drainability of drain valve obviously can't be tackled this kind situation, finally can cause condensed water elimination freely not reduce the interior thermal efficiency of drying cylinder, increase the consumption of steam.

4, drain valve need to be opened the atmospheric valve draining because frequent impeded drainage causes the paper baking not do, and also can take a large amount of live steams out of when atmospheric valve one meeting brings out the water in the drying cylinder, and these steam all can be discharged to atmosphere and waste.

5, the condensate temperature that emits through drain valve from drying cylinder is all more than 120, these heats are not utilized fully and directly are collected into uncovered condensed water collecting device, because pressure decreased, flash distillation occurs under atmospheric effect, the tail vapour that these flash-off steams and drain valve or exhaust-valve leak will be discharged in the middle of the atmosphere, causes suitable energy dissipation.

Sum up as above several problems, prior art paper for daily use single cylinder paper machine needs most problem and mainly contains two, and one is the drainage problem that solves drying cylinder, and another is to solve the tail vapour that ejects together along with condensed water and the reuse of flash-off steam.If solving on the basis of these two subject matters, the simultaneously reuse of amount of residual heat will in the discharging of on-condensible gas, the condensed water in the resolution system just can reduce the steam consumption of this type of paper machine to greatest extent, reaches energy-saving and cost-reducing to greatest extent.

Summary of the invention

The utility model provides a kind of paper for daily use single cylinder paper machine based on the control of tail steam flow amount and heat pump techniques for above-mentioned the deficiencies in the prior art,

Technology path of the present utility model is:

Paper for daily use single cylinder paper machine based on the control of tail steam flow amount and heat pump techniques, comprise main drying cylinder and control system, it is characterized in that described main drying cylinder connects a gas-liquid separator, through tail steam flow that gas-liquid separator separates goes out through returning main drying cylinder recycling after by adjustable heat pump compression behind the flow detector, described adjustable heat pump is mainly by mobile device, nozzle, spool, Adam's apple, release, tail vapour suction side and mesohigh steam suction side form, the top of spool is communicated with mesohigh steam suction side, the bottom is communicated with tail vapour suction side, front end connects nozzle, the rear end links to each other with mobile device, mesohigh steam therefrom high compressed steam suction side enters spool by being gone out by nozzle ejection, the negative pressure that is injected in nozzle exit formation of mesohigh steam is aspirated the tail vapour of tail vapour suction side simultaneously, mesohigh steam and tail vapour compress in the middle of Adam's apple, then increase behind the pressure from exporting central discharge by release.

Pipeline between described gas-liquid separator and the tail steam flow amount detecting device is provided with an incondensable gas tapping equipment, includes the keying that the temperature-sensing element sense temperature decides this tapping equipment.

The hot water that described gas-liquid separator separates goes out enters a heat exchanger that is used for the heat energy recycling through pipeline.

Described control system mainly comprises following part:

Pressure control loop: formed by control valve and pressure transmitter, be used for regulating the steam pressure that enters drying cylinder;

Pressure reduction shows and antiaircraft loop: be comprised of control valve and pressure difference transmitter, be mainly used in showing the inlet outlet pressure differential of drying cylinder under the auto state, the height of detected pressures control loop limit alarm signal simultaneously, in case operating pressure superelevation then control valve is opened release pressure automatically, the protection drying cylinder is installed; Discharge air when being mainly used in starting shooting warm cylinder under the manual state;

Tail steam flow amount rate control loop: by adjustable heat pump, tail vapour flowing test meter, and pressure difference transmitter form, the data communication device overpressure difference transmitter that tail steam flow orifice detects is converted to 4-20mA signal input DPIC controller, and then adjusting heat pump is kept the flow of the tail vapour of setting;

Liquid level control loop: be comprised of the fluid level transmitter of joining on control valve and the magnetic flap level gauge, it is constant to keep the steam-water separator liquid level by adjusting control valve.

One way of life paper using single cylinder paper machine steam method for recycling is characterized in that the method may further comprise the steps:

Step 1: low-pressure steam passes into main drying cylinder, the heat transferred wet paper, becomes condensed water and gets rid of outside the main drying cylinder by siphoning installation for the steam of doing heat exchange, and entering a gas-liquid separator carries out gas-liquid separation;

Step 2: a kind of isolated tail steam flow of step is through getting back to main drying cylinder recycling after by the compression of adjustable heat pump behind the flow detector.

The key equipment that transformation single cylinder paper machine vapour system is used is adjustable heat pump, and paper is adjustable heat pump concept and the effect in the middle of system once.The structural map of adjustable heat pump as shown in Figure 3, the major part that adjustable heat pump comprises has: mobile device, nozzle, spool, Adam's apple, release, tail vapour suction side and mesohigh steam suction side.

Heat pump is regulated mobile device by accepting the signal of telecommunication, and mobile device links to each other with spool, by change gap between spool and the nozzle regulate in/the introducing amount of high steam.In the middle of/at a high speed spouting in the middle of nozzle of high steam after, can form a negative pressure in the exit portion of nozzle, to tail vapour a swabbing action be arranged.In a small amount of/high steam compresses in the middle of the Adam's apple of rear end with tail vapour, then by behind the release increase pressure from exporting central discharge.

So adjustable heat pump can be realized above-mentioned two effects:

1, by in high-octane/high steam promotes the operating pressure of tail vapour;

2, under the effect of venturi phenomenon, the back pressure place of nozzle can form a negative pressure, and negative pressure can have strong swabbing action to tail vapour.

Technology Roadmap of the present utility model as shown in Figure 4, low-pressure steam passes into main drying cylinder, the wet paper of heat transferred, becomes condensed water.Condensed water and a part are not done the steam of heat exchange and are discharged outside the drying cylinder by siphoning installation, enter gas-liquid separator and separate.The steam of separating, we are referred to as " tail vapour ", and the tail steam flow is got back to main drying cylinder recycling after being compressed by heat pump behind the flow detector.An incondensable gas tapping equipment is set on the pipeline of tail steam flow warp, there is temperature-sensing element principle device inside, selects to open or close according to the difference of temperature, when fixed gas accumulates in around the incondensable gas tapping equipment, temperature reduces, and then opens; Treat incondensable gas discharge after steam replenish and come, temperature rises and then closes.Adjustable heat pump need to use a small amount of in/high steam is as the power source of compression tail vapour, simultaneously adjustable heat pump to open large and turn down be that signal according to tail steam flow amount detecting device gives is regulated.The hot water of discharging in the gas-liquid separator can exchange some hot water injection's woollen blankets at first through a little heat-exchanger rig, improves the temperature of woollen blanket or exchanges the moisture that some hot air blow an off line blanket part, helps to improve drying efficiency.

Through after the above-mentioned transformation, adjustable heat pump can be with the whole compression and back usefulness of the tail vapour of discharging in the drying cylinder, and adjustable heat pump can increase draining pressure reduction to the swabbing action of tail vapour simultaneously, and draining pressure reduction is the power of drying cylinder condensed water elimination, pressure reduction is larger, and the condensed water elimination effect is better.Draining pressure reduction can not be excessive, and excessive draining pressure reduction can cause along with condensed water elimination brings out a large amount of tail vapour, compress a large amount of tail vapour need more substantial in/high steam and cause waste.So we need to select a suitable flow rate ratio with tail vapour through a flow detector, namely can guarantee the whole compressed reuses of tail vapour, can provide again enough pressure difference-powered condensed waters that guarantees to discharge smoothly.Condensed water in the drying cylinder emits smoothly, can guarantee that the condensed water in the drying cylinder is few as much as possible, and the service efficiency that steam passes into after the drying cylinder can be high as much as possible, reduces the use amount of steam.

Description of drawings

Fig. 1 is prior art single cylinder paper machine configuration schematic diagram.

Fig. 2 be condensation water quantity and start-up time graph of a relation.

Fig. 3 is the adjustable heat pump structure schematic diagram of the utility model.

Fig. 4 is the utility model single cylinder paper machine configuration schematic diagram.

Fig. 5 is the utility model single cylinder paper machine system configuration flow chart.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further described.

As shown in Figure 4 and Figure 5, the dry parts of the trunk of single cylinder toilet paper machine are a drying cylinder 5, vapour system disposes in one/high steam pipeline 1, in/high steam detects pressure above the drying cylinder inlet manifold roads 4 by pressure transmitter 3, and regulates the operating pressure that enters drying cylinder 5 by control valve 2.Enter the steam of drying cylinder through heat exchange, become condensed water, condensed water is being discharged outside the drying cylinder by siphon device 6 under the effect of drying cylinder 5 inlet outlet pressure differentials, and inlet outlet pressure differential is detected by pressure difference transmitter 25, and pressure difference transmitter is by connecting pipe 37 pressures.Enter steam-water separator 8 from the tail vapour of drying cylinder 5 interior discharges and the mixture of condensed water by main sewer 7.Pressure gauge 9 and magnetic flap level gauge 10 are installed above the steam-water separator, magnetic flap level gauge 10 can by inside with fluid level transmitter 11 export control system to.

The tail vapour that steam-water separator is separated through behind the flowing test meter 21, enters the low pressure suction inlet of Adjustable Heat Pump by pipeline 18, and a check valve 26 was installed before tail vapour enters the low pressure suction inlet.In/high steam accesses the high pressure suction inlet of adjustable heat pump, in/to discharge after the tail vapour pressure contracting that high steam is separated steam-water separator, the tail vapour after the compression is got back to again reuse in the drying cylinder 5 by pipeline 30 after through a safety valve 29.

The condensed water that steam-water separator is separated enters heat exchanger 15 through behind the drainpipe 12.Be provided with control valve 13 above the drainpipe 12, can regulate drainability according to the liquid level of steam-water separator 8.After condensed water enters heat exchanger 15, can do heat exchange with air with pressure or cold water, the condensed water after temperature reduces drains into the condensation water collection district from pipeline 14.Low temperature air with pressure or cold water enter heat exchanger through piping 16, and the hot-air with pressure after the heating or hot water are discharged through piping 17, and hot-air can be used for blowing away the water smoke above the woollen blanket; Hot water can be used for the cleaning forming web or be used for paper pulp, and the temperature that improves forming web or paper pulp helps energy savings.

Adjustable heat pump is mainly by mobile device 50, nozzle 53, spool 52, Adam's apple 55, release 56, tail vapour suction side 52 and mesohigh steam suction side 51 form, the top of spool 52 is communicated with mesohigh steam suction side 51, the bottom is communicated with tail vapour suction side 51, front end connects nozzle 53, the rear end links to each other with mobile device 50, mesohigh steam therefrom high compressed steam suction side 51 enters spool 52 by spouting by nozzle 53, the negative pressure that is injected in the formation of nozzle 53 exits of mesohigh steam is aspirated the tail vapour of tail vapour suction side 52 simultaneously, mesohigh steam and tail vapour is compression in the middle of Adam's apple 55, then by discharging in the middle of exporting 57 behind the release 56 increase pressure.

The control section explanation:

Whole control system for paper machine mainly comprises 4 controls and show circuit:

1, the PIC pressure control loop 34: be comprised of control valve 2 and pressure transmitter 3, be used for regulating the steam pressure that enters drying cylinder.

2, DPI pressure reduction shows and emptying loop 33: be comprised of control valve 23 and pressure difference transmitter 25; be mainly used in showing the inlet outlet pressure differential of drying cylinder under the auto state; detect simultaneously the high limit alarm signal 35 of PIC pressure control loop; in case operating pressure superelevation then control valve 23 is opened release pressure automatically, the protection drying cylinder is installed.Discharging air when being mainly used in starting shooting warm cylinder under the manual state uses.

3, DPIC tail steam flow amount rate control 32: by adjustable heat pump 28, tail vapour flowing test meter 21, and pressure difference transmitter 22 form.The data communication device overpressure difference transmitter 22 that tail steam flow orifice 21 detects is converted to 4-20mA signal input DPIC controller, and then adjusting heat pump is kept the flow of the tail vapour of setting.

4, the LIC liquid level control loop 35: be comprised of the fluid level transmitter 11 of joining on control valve 13 and the magnetic flap level gauge.It is constant to keep the steam-water separator liquid level by adjusting control valve.

Because low speed single cylinder paper machine configuration is low, often and without control system, so consider for function cost performance factor, we select 4 Intelligence Regulator (the single table of PID) to realize the automatic control of 4 control loops.And 4 Intelligence Regulator are incorporated in the control cabinet 31 install concentratedly, power.Intelligence Regulator can realize the conversion of hand/automatic two kinds of state of a controls, and is easy to operate.

After transformation as above, the vapour system of single cylinder paper machine has following new characteristics:

1, increases automatic control, can replace manually doing exercises, reduced labor workload.Simultaneously automatic control can make the drying cylinder admission pressure steady, can overcome the fluctuation of external bleed pressure, fully guarantees into the paper dry mass.

2, condensed water elimination is smooth and easy, and whole system has adjustable drainability, how much regulates draining pressure reduction according to the condensed water in the drying cylinder at any time.

3, from the tail vapour of discharging in the drying cylinder again circulating and recovering in the middle of system, use, reduce steam consumption.

4, increase the on-condensible gas exhaust unit, invariably coagulate gas accumulative total in the middle of the assurance system, improve the heat transfer efficiency of drying cylinder heat exchange.

5, the high-temperature condensation water of discharging can pass through hot blast or Recovery of the hot water part heat, for reducing the energy resource consumption of other parts of single cylinder paper machine.

6, the drying cylinder draining is smooth and easy can obtain the highest hot transfer efficiency, improves the machine dried ability, reduces drying cylinder transmission load, reduces the siphon device probability of damage, creates conditions for improving output.

Therefore, the tail vapour cycle control system for heat pump design principle that is applied to low speed single cylinder paper for daily use paper machine is advanced, be in customer service utility model in the situation of original all disadvantages of steam-condensation water system, possess many advantages of introducing herein.Increase in few situation in equipment investment, can significantly reduce the production cost of enterprise, increase to greatest extent the profit margin of enterprise.

Claims (4)

1. based on the paper for daily use single cylinder paper machine of tail steam flow amount control and heat pump techniques, comprise main drying cylinder and control system, it is characterized in that described main drying cylinder connects a gas-liquid separator, through tail steam flow that gas-liquid separator separates goes out through returning main drying cylinder recycling after by adjustable heat pump compression behind the flow detector, described adjustable heat pump is mainly by mobile device, nozzle, spool, Adam's apple, release, tail vapour suction side and mesohigh steam suction side form, the top of spool is communicated with mesohigh steam suction side, the bottom is communicated with tail vapour suction side, front end connects nozzle, the rear end links to each other with mobile device, mesohigh steam therefrom high compressed steam suction side enters spool by being gone out by nozzle ejection, the negative pressure that is injected in nozzle exit formation of mesohigh steam is aspirated the tail vapour of tail vapour suction side simultaneously, mesohigh steam and tail vapour compress in the middle of Adam's apple, then increase behind the pressure from exporting central discharge by release.

2. the paper for daily use single cylinder paper machine based on tail steam flow amount control and heat pump techniques according to claim 1, it is characterized in that the pipeline between described gas-liquid separator and the tail steam flow amount detecting device is provided with an incondensable gas tapping equipment, includes the keying that the temperature-sensing element sense temperature decides this tapping equipment.

3. the paper for daily use single cylinder paper machine based on the control of tail steam flow amount and heat pump techniques according to claim 1 is characterized in that the hot water that described gas-liquid separator separates goes out enters a heat exchanger that is used for the heat energy recycling through pipeline.

4. the paper for daily use single cylinder paper machine based on tail steam flow amount control and heat pump techniques according to claim 1 is characterized in that described control system mainly comprises following part:

Pressure control loop: formed by control valve and pressure transmitter, be used for regulating the steam pressure that enters drying cylinder;

Pressure reduction shows and antiaircraft loop: be comprised of control valve and pressure difference transmitter, be mainly used in showing the inlet outlet pressure differential of drying cylinder under the auto state, the height of detected pressures control loop limit alarm signal simultaneously, in case operating pressure superelevation then control valve is opened release pressure automatically, the protection drying cylinder is installed; Discharge air when being mainly used in starting shooting warm cylinder under the manual state;

Tail steam flow amount rate control loop: by adjustable heat pump, tail vapour flowing test meter, and pressure difference transmitter form, the data communication device overpressure difference transmitter that tail steam flow orifice detects is converted to 4-20mA signal input DPIC controller, and then adjusting heat pump is kept the flow of the tail vapour of setting;

Liquid level control loop: be comprised of the fluid level transmitter of joining on control valve and the magnetic flap level gauge, it is constant to keep the steam-water separator liquid level by adjusting control valve.

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