CN1115188C - Dehumidifying method for compressed gas and its apparatus - Google Patents

Abstract

The present invention relates to a dehumidifying method for compressed gas and its apparatus. In a method for dehumidifying compressed air: a drying process, in which gas is adsorbed and dried in one of two adsorbing cylinders 3, 4 each charged with adsorbents, and a regenerating process, in which a part of the obtained dried gas is led to the other adsorbing cylinder to desorb the moisture from the adsorbents concurrently performed, and these processes are alternately performed by switching from one cylinder to the other to continuously supply dry gas; under predetermined conditions, if the relationship between the dew point Ta and a set dew point Ts is Ta <= Ts in dried gas, the drying process is continued alternately between both cylinders, while a process for purging of desorbed moisture from each cylinder that is suspended is provided.

Description

The dehumanization method of Compressed Gas and device thereof

The present invention relates to a kind ofly wet Compressed Gas be carried out the dehumanization method and the device thereof of adsorption and dehumidification and in addition dry Compressed Gas, relate in particular to preventing the energy-saving operation of adsorbent premature ageing with adsorbent.

In existing dehydrating unit,, prepare two absorbing cylinders of in container, filling adsorbents such as activated alumina, silica gel, synthetic zeolite and lithium chloride for supplying with dry air continuously.

The absorbing cylinder that wet contractive pressure air is imported a side carries out adsorption dry, supplies with given supply place.Simultaneously, a resulting dry gas part is imported the opposing party's absorbing cylinder, by in moisture absorption previous stage and the adsorbent that adsorption capacity descends is separated the moisture absorption branch, and then should wet by absorbing cylinder and minute to remove regeneration.In this step for regeneration, resulting dry air has 20% to put into atmosphere approximately.

When the adsorbent reactivation of the compressed air drying of this side's absorbing cylinder and the opposing party's absorbing cylinder carried out concurrently, through after preset time, the switching valve that conversion is located between two absorbing cylinders was supplied with dry air continuously.

But dehydrating unit is to be reference design with environment temperature or the intake air temperature the harshest condition in summer that rises, therefore, as use winter or during supply place load reduction etc., the suction-operated of adsorbent alleviated and seek its prolongation in service life, be desirable.

Figure 11 shows existing energy-saving operation situation.That is to say, stop the running action of switching valve and the air bleeding valve that is connected with each absorbing cylinder and all become closure state.For example, only import wet air for continuous adsorption and dehumidification drying, interrupt two regeneration of A, B simultaneously to the B tube.

When energy-saving operation, stop the switching motion of switching valve and under all closed state of the scavenging valve that is connected with absorbing cylinder, reduce the discharge rate of removing dry air.Yet because the difference of condition, above-mentioned energy-saving operation can carry out for a long time continuously,, have only the adsorbent in side's absorbing cylinder to play suction-operated, and the adsorbent in the opposing party's absorbing cylinder does not have any effect around here.

Therefore, returning under the standard operation state, the adsorbents adsorb amount of moisture in the absorbing cylinder of removal moisture drying degenerates with the balance that adds the adsorbents adsorb amount of moisture in side's absorbing cylinder of no any effect continuously.In fact, the dew-point temperature of the dry air of supplying with from a side of continuous removal moisture drying is than the dew-point temperature height of the dry air of being supplied with by the opposing party.

As a result, continuously long-time suction-operated one side's adsorbent has been compared premature ageing, the adsorbent that generation need more renew with another main adsorbent.In general, if any one takes place to wear out in the adsorbent, then both all need change, and this is a kind of waste to another adsorbent, brings extremely bad influence to operating cost.

The present invention makes for solving above-mentioned problem, its purpose is, a kind of removing amount that can suppress the dry air through removing when so-called energy-saving operation slightly is provided, can make simultaneously the adsorbent in two absorbing cylinders that impartial wearing out takes place, dew-point temperature when suppressing to return to standard operation between each absorbing cylinder changes, and make time that adsorbent changes for carrying out simultaneously, the replacing that avoids waste and helping reduces the dehumanization method and the device thereof of the Compressed Gas of operating cost.

In order to reach the purpose that solves above-mentioned problem, the dehumanization method of Compressed Gas of the present invention and device thereof have following formation.

(1) dehumanization method of the present invention, be to make wet Compressed Gas import the drying process that a side in two absorbing cylinders of filling adsorbent carries out adsorption and dehumidification, separate by adsorbent with importing in the opposing party's that wettability power descends in the drying process of previous stage the absorbing cylinder that moisture absorption divides and the step for regeneration the wet branch of desorb removed by absorbing cylinder carries out concurrently by the part of the resulting dry gas of this drying process, this drying process and step for regeneration alternately change and provide continuously the dehumanization method of dry gas between two absorbing cylinders, it is characterized in that, has under specified criteria continuous drying operation alternately between two absorbing cylinders, stop the operation of the wet branch of desorb simultaneously by each absorbing cylinder removing.

(2) be the dehumanization method of above-mentioned (1) described Compressed Gas, it is characterized in that described specified criteria is set dew-point temperature (dew point under the pressure) Ts (Ta≤Ts) for being equal to or less than by dew-point temperature (dew point under the pressure) Ta of the resulting dry gas of drying process.

(3) dehydrating unit of the present invention, be to comprise two absorbing cylinders and access that is communicated with two absorbing cylinders by translation building block and removing member of filling adsorbent, the absorbing cylinder adsorption and dehumidification that wet Compressed Gas is imported a side carries out drying, the part of this dry gas is imported the opposing party's absorbing cylinder, separate the moisture absorption branch and eliminate regeneration side by side by absorbing cylinder by the adsorbent that adsorption capacity descends in previous stage by the wet branch of exhaust component desorb, by between two absorbing cylinders, alternately changing dry according to the conversion of above-mentioned translation building block and regenerating and also supply with the dehydrating unit of the Compressed Gas of dry gas continuously, it is characterized in that, have under specified criteria, conversion translation building block and the alternately removal moisture drying continuously of Compressed Gas to wetting between two absorbing cylinders continuously, control simultaneously stops the control member to the removing member of each absorbing cylinder.

The described means in above-mentioned by taking (1)-(3), when under specified criteria, beginning so-called energy-saving operation, can control the removing amount slightly, also can make the adsorbent in two absorbing cylinders aging equably, and the variation of the dew-point temperature between each absorbing cylinder can suppress to return to standard operation the time, and time of the replacing of adsorbent become simultaneously carry out.

(4) a kind of dehumanization method of Compressed Gas, be to make wet Compressed Gas import the drying process that a side in two absorbing cylinders of filling adsorbent carries out adsorption and dehumidification, separate the step for regeneration that the moisture absorption branch removes by adsorbent and carry out concurrently with importing in the opposing party's absorbing cylinder that adsorption capacity descends in the drying process of previous stage by the part of the resulting dry gas of this drying process, this drying process and step for regeneration be alternately conversion between two absorbing cylinders, and supply with the dehumanization method of dry gas continuously, it is characterized in that, under specified criteria, when stopping the energy-saving operation of described step for regeneration, in this energy-saving operation, carry out step for regeneration with the given cycle.

(5) be the dehumanization method of above-mentioned (4) described Compressed Gas, it is characterized in that in the step for regeneration under stopping described specified criteria, described drying process alternately carries out continuously between two absorbing cylinders, perhaps only carry out continuously at side's absorbing cylinder.

(6) dehydrating unit of the present invention, be to comprise two absorbing cylinders and access that is communicated with two absorbing cylinders by translation building block and removing member of filling adsorbent, the absorbing cylinder absorption that wet Compressed Gas is imported a side is coated with the wet drying of carrying out, the part of this dry gas is imported the opposing party's absorbing cylinder, separate the moisture absorption branch and the wet branch of desorb is removed regeneration concurrently by absorbing cylinder by the adsorbent that adsorption capacity descends in previous stage by removing member, conversion alternately conversion regeneration and the dry wet device of being coated with of dry gas of also supplying with continuously between two absorbing cylinders by above-mentioned translation building block, it is characterized in that, have under specified criteria, when stopping the energy-saving operation of described step for regeneration, in this energy-saving operation, the control member of step for regeneration is carried out in control with period demand.

The means of above-mentioned by adopting (4)-(6), under specified criteria, stop the so-called energy-saving operation of step for regeneration, because carry out Compulsory Removal to two square tubes in adsorbent with period demand this moment, can suppress the removing amount slightly and the aging of adsorbent carried out equably, the variation of dew-point temperature between each absorbing cylinder in the time of can suppressing to return to standard operation, and the time that adsorbent is changed become simultaneously carry out.

Below accompanying drawing is done simple declaration.

Fig. 1 is the stereoscopic figure of the dehydrating unit of one embodiment of the invention.

Fig. 2 analyses and observe sketch map for the dehydrating unit shown in the same embodiment.

Fig. 3 is the cutaway view, explanation of the dehydrating unit shown in the same embodiment and the figure of the different operations of Fig. 2.

Fig. 4 A-D is expressed as same embodiment illustrates exsiccation successively from the conversion of circulation flow path formation figure.

Fig. 5 is for being transformed into the flow chart of energy-saving operation by standard operation shown in the same embodiment.

Control key diagram when Fig. 6 is a standard operation shown in the same embodiment.

The first routine key diagram of energy-saving operation control when Fig. 7 is a few flow shown in the same embodiment.

The key diagram of energy-saving operation control when Fig. 8 is a middle flow shown in the same embodiment.

The second routine key diagram of energy-saving operation control when Fig. 9 is a few flow shown in shown in the same embodiment.

Figure 10 A, B be shown in the same embodiment few flow the time energy-saving operation control the 3rd routine key diagram.

The key diagram that Figure 11 controls during for existing energy-saving operation.

17-adsorbent in above-mentioned accompanying drawing, 3-absorbing cylinder (A tube), 4-absorbing cylinder (B tube), 26-switching valve (translation building block), 27-removing member (scavenging valve), 23-dew cell, 25-control circuit (control member), 30-importing road, 31-A tube access, 32-B tube access, 33-exhaust outlet access, 34-remove branch road.

Below in conjunction with description of drawings one embodiment of the invention.Fig. 1 is the stereoscopic figure of the dehydrating unit of Compressed Gas.

Two absorbing cylinders that this dehydrating unit comprises the stand 1 of bottom one side, the electric part box of installing on the top of these stand 1 one sides 2, install on the top of the opposite side of stand 1 are (for ease of explanation, below the absorbing cylinder that the absorbing cylinder in left side among the figure is called A tube, right side is called the B tube) 3,4 and the water outlet head of installing in A, B tube upper end and the not shown water inlet head of installing in whole A, B tube bottom constitute.

This water outlet head 5 is mounted and fixed on the stand 1 by many column support type bolts 6 and nut 7, so two 3 of A, B, 4 are kept regularly.Above-mentioned water inlet head is hidden by the cover plate 8 that is installed on the above-mentioned stand 1.

On a side of above-mentioned water outlet head 5, be provided with the gas of adsorption dry in the device is supplied with the air inlet 9 of usefulness to given supply place guiding, and the introducing port 10 of an opening is arranged on a side of stand 1.In wet Compressed Gas gatherer.

In addition, be provided with humidity indicator 11 at the middle body of water outlet head 5, contain and contact with the gas of adsorption dry, the state that surpasses given relative temperature at this gas issues the parts of the look that changes.That is to say that humidity indicator 11 is to detect two 3 of A, B, 4 interior adsorbent degree of agings of being accommodated.

Have, water outlet head 5 is provided with the discharge orifice 12 that is interconnected with two 3 of A, B, 4 upper ends again.Be provided with in the other side's one side of this discharge orifice 12 and connect a pair of connector 13 that air bleeding valve is as described later used.

Fig. 2 and Fig. 3 generally illustrate the cross section of identical adsorbent equipment, are the different states that interacts.

Two 3 of above-mentioned A, B, 4 cylindrical shells by the upper and lower end face opening constitute, and upper end open portion is by intercalation set recess 5a below water outlet head 5, and the lower end open portion by intercalation at the set recess 15a above the head 15 of intaking as previously mentioned.

So, be provided with porous plate 16 on the position at given interval leaving respectively by the upper end open of each A, B tube 3,4 and lower ending opening, and between these porous plates 16, fill adsorbent 17.As adsorbent 17, can use activated alumina, silica gel and zeolite etc.

On the position relative, form the clack box 19 of accommodating check valve 18A, 18B with each A, B tube 3,4 middle bodies of above-mentioned water outlet head 5.These check valves 18A, 18B allow that gas flows upward in the tube 3,4 of bottom one side, and stop gas to flow in last direction tube 3,4.

Also have, on water outlet head 5, be provided with the air inlet road 20 that is communicated with above-mentioned air inlet 9, each clack box 19, open check valve 18A, 18B and the gas channeling air inlet 9 that will come out from clack box 19.In addition, these air inlet road 20 top sets be provided with the branch road 21 that is communicated with above-mentioned humidity indicator 11.

Around each clack box 19, form depression in by the scope of intercalation and become and foregoing cleaning hole (referring to here be arranged on the water outlet head 5) the removing chambers 22 that are communicated with 12 at two 3 of A, B, 4.In other words, remove between the chamber 22,22 by cleaning hole 12 connections.

Be closed with the end of the air inlet 9 relative sides on above-mentioned air inlet road 20, connect ground dew cell 23 is installed.Only as shown in Figure 3, in above-mentioned electric part box 2, accommodate control member-control circuit 25, and be electrically connected with above-mentioned dew cell 23.Dew cell 23 detect air inlet roads 20 dry air temperature and its detection signal delivered to control circuit 25.

Below above-mentioned water inlet head 15, translation building block-switching valve 26 is installed.Sidepiece at water inlet head 15 is provided with above-mentioned introducing port 10, is connected in series with scavenging valve 27 and silencer 28 in the other side.

On above-mentioned switching valve 26, be provided with successively by the figure left side first exhaust outlet a, the second exhaust outlet b, the 3rd exhaust outlet c, the 4th exhaust outlet d, the 5th exhaust outlet e to the right.Valve body f carries out the mutual connection conversion of various exhaust outlet a-e by moving.

That is to say, on valve body f position as shown in Figure 2, when the first exhaust outlet a is communicated with the second exhaust outlet b, be communicated with the 3rd exhaust outlet c and the 4th exhaust outlet d.In addition, on valve body f position shown in Figure 3, when the second exhaust outlet b is communicated with the 3rd exhaust outlet c, be communicated with the 4th exhaust outlet d and the 5th exhaust outlet e.

Above-mentioned valve body f is driven by helix tube 26s.This helix tube 26s is electrically connected with foregoing circuit 25, and carries out driving control as described later.

The importing road 30 that is communicated with introducing port 10 and the 3rd exhaust outlet C of switching valve 26 is installed on above-mentioned water inlet head 15, be communicated with the lower open end of A tube 3 and the second exhaust outlet b A tube access 31, be communicated with the lower open end of B tube 4 and the 4th exhaust outlet d B tube access 32, be communicated with the big U font exhaust outlet access 33 of the first exhaust outlet a and the 5th exhaust outlet e, and by the mid portion branch of this exhaust outlet access 33 and the removing branch road 34 that is communicated with above-mentioned scavenging valve 27.

Above-mentioned scavenging valve 27 is the electromagnetic switch valves that constitute usually, and is electrically connected with above-mentioned control circuit 25.Open and close according to the control signal from this control circuit 25, conducting or cut-out are by removing the removing gas that branch road 34 is derived.Import muffler 28 noise reductions by the removing gas of deriving here, and to outside drain.

Above-mentioned control circuit 25 includes acceptance from the detection signal of above-mentioned dew cell 23 and be converted into the circuit of dew-point temperature (dew point under the pressure) Ta and the circuit that setting dew-point temperature (dew point under the pressure) Ts of this dew-point temperature Ta and storage is in advance compared, and according to this comparative result above-mentioned switching valve 26 is carried out the circuit that the switch of conversion and control and scavenging valve 27 is controlled.

The adsorbent equipment of Gou Chenging plays a part as described below like this.Have again, use compressed air to describe as Compressed Gas.

When the valve body f of switching valve 26 is positioned at position shown in Figure 2, carry out drying process, at A tube 3 boost operation or step for regeneration at B tube 4.

That is to say that the compressed air that wets to the dehydrating unit supply passes through to import the 3rd exhaust outlet c of road 30 importing switching valves 26 by the introducing port 10 of the head 15 of intaking, and then pass through the 4th exhaust outlet d by in the B tube access 32 importing B tubes 4.

Wet compressed air by B tube 4 in the bottom involve whole top during in, adsorb the dehumidification drying process by the adsorbent 17 of wherein being filled.Then, make the check valve 18B lift valve that is arranged on this top, with the air inlet road 20 of this compressed air importing water outlet head 5, and then by air inlet 9 supply supplies place.

In addition, the part of the dry gas that is come out by B tube 4 upper end open portions imports removes chamber 22, and then regulates flows by cleaning hole 12, and the exhaust chamber 22 by A tube 3 tops imports in the A tubes 3.Then, by the adsorbents 17 of being filled in the A tube 3, the wet branch that desorb adsorbent previous stage 17 is adsorbed.

Air-removing air that desorb should be wet and divide is derived by the first exhaust outlet a by the second exhaust outlet b by A tube access 31, is directed at exhaust outlet access 33.After the 5th exhaust outlet e is in blocked state, eliminates air and be directed at removing branch road 34 by exhaust outlet access 33.

When air bleeding valve 27 is in closure state, eliminates air and blocked, therefore, form the operation of boosting that A tube 3 internal pressures rise at this.When air bleeding valve 27 is in open state, eliminates air and import elimination sound device 28,, form step for regeneration to outside drain here by after the noise reduction by scavenging valve 27.

When the valve body f of switching valve 26 is position shown in Figure 3, in A tube 3, forms drying process, and form boost operation or step for regeneration at B tube 4.

That is to say that the wet compressed air of supplying with to dehydrating unit imports the 3rd exhaust outlet c of switching valves 26 by the introducing port 10 of water inlet head 15 by importing road 30, and then is imported by A tube access 31 by the second exhaust outlet b in A tube 3.

Wet compressed air by in the A tube 3 by the bottom during the top, carry out being undertaken the drying process of drying by adsorbent 17 adsorption and dehumidifications of wherein being filled.Then, the check valve 18A that top is provided with drives valve, imports the air inlet road 20 of water outlet head 5, and then supplies with supply place by air inlet 9.

In addition, the part of the dry gas of being derived by A tube 3 upper end open portions imports exhaust chamber 22, regulates flows by cleaning hole 12, and the removing chamber 22 by B tube 4 tops imports in the B tubes 4.

This dry air is by the wet branch of adsorbent 17 desorbs of filling in the B tube 4 adsorbent 17 absorption in the last period drying process.Desorb should be derived by the 5th exhaust outlet e by the 4th exhaust outlet d by B tube access 32 by the wet air-removing air that divides, and then imports exhaust outlet access 33.

After the first exhaust outlet a is in blocked state, removes air and import removing branch road 34 by exhaust outlet access 33.When scavenging valve 27 is in closure state, removes air and be cut off, form the operation of boosting that B tube 4 internal pressures rise at this.When scavenging valve 27 is in open state, remove air and import muffler 28 by scavenging valve 27, form the step for regeneration of emitting after the noise reduction here to the outside.

Secondly, shown in Fig. 4 (A) to (D), the conversion aspect that constitutes from stream in turn illustrates above-mentioned exsiccation.

Among Fig. 4 (A), wet compressed air imports B tube 4 by switching valve 26, is adsorbed drying by the adsorbent 17 of being filled here.Dry compressed air is supplied with supply place by check valve 18B.

In addition, the part of the dry air that is come out by B tube 4 imports A tubes 3 by cleaning hole 12, but scavenging valve 27 makes and boosts to running pressure in the A tube 3 when closed.That is to say, in B tube 4, form drying process, in A tube 3, form the operation of boosting.

In Fig. 4 (B), in the time of switching valve 26 conversions, scavenging valve 27 becomes open state.Wet compressed air imports A tube 3 by switching valve 26, carries out adsorption dry by adsorbent 17.

Dry compressed air provides by check valve 18, and the part of the dry air that is provided by A tube 3 imports B tubes 4 by cleaning hole 12, by the wet desorb of branch of adsorbent.

This removes air by open scavenging valve 27, imports muffler 28, emits to the outside thus.That is to say, carry out drying process, carry out step for regeneration at B tube 4 at A tube 3.

In Fig. 4 (C), switching valve 26 keeps its original state, and 27 of scavenging valves become closure state simultaneously.Therefore, carry out drying process continuously, and in B tube 4, boost to the operation of boosting of running pressure at A tube 3.

In Fig. 4 (D), in the time of switching valve 26 conversions, scavenging valve 27 becomes open state.Wet compressed air imports B tube 4 by switching valve 26, by final reproducing adsorbent 17 adsorption dries.

Dry compressed air provides by check valve 18B.In addition, the part of the dry air that is come out by B tube 4 imports A tubes 3 by cleaning hole 12, becomes by adsorbent 17 and separates the elimination air that moisture absorption divides, and is emitted to the outside by muffler 28 by scavenging valve 27.That is to say, carry out drying process, carry out step for regeneration at A tube 3 at B tube 4.

After this, convert the state of Fig. 4 (A) again to, more than four kinds of operations carry out repeatedly successively.

When standard operation, carry out control as shown in Figure 6.

That is to say that above-mentioned control circuit 25 controls were changed switching valve 26 at interval with two minutes, therefore, carried out the conversion of the drying process of adsorption and dehumidification with about two minutes interval at A tube 3.

So, the conversion that control circuit 25 will be controlled to the opening that makes scavenging valve 27 and switching valve 26 substantially the time consistent, and the closure of scavenging valve 27 will be before changing switching valve 26 next time.

For example, in order to carry out the drying process of adsorption and dehumidification in A tube 3, after 26 back several seconds, control scavenging valve 27 is open at the conversion switching valve, and the pressure when beginning is removed in 4 regeneration of inhibition B tube changes.

Above-mentioned air bleeding valve 27 is set at only about 90 seconds opening, around here the step for regeneration of B tube 4 continuously.Then, after the removal moisture drying of A tube 3 began, after about 90 seconds, therefore scavenging valve 27 closures, became the operation of boosting in B tube 4.

Continuous approximately 30 seconds of the operation of boosting in B tube 4 is amounting to about 120 seconds (2 minutes) afterwards, conversion switching valve 26, at the drying process of B tube 4 adsorption and dehumidifications continuous 120 seconds.After this conversion several seconds, control scavenging valve 27 is open, and after A tube 3 carried out step for regeneration in continuous 90 seconds, scavenging valve 27 about 30 seconds closures became the operation of boosting in A tube 3 one sides.

As a result, about 120 seconds (2 minutes) continuously after, become drying and the regeneration of B tube 4 one sides and the operation of boosting of foregoing adsorption and dehumidification in A tube 3 one sides once more, and by carrying out with a reiteration ground.

Above-mentioned dew cell 23 detects through adsorption and dehumidification and dry compressed-air actuated humidity, and detection signal is sent to control circuit 25, is calculated to be dew-point temperature (dew point under the pressure) Ta here, and its result is exported with the sensing element output voltage.

For example, the air capacity that needs in the place of being supplied with by air inlet 9 is few and even do not had etc., under the little situation of so-called load or extremely low and under the dry situation, carry out the transition to energy-saving operation in the compressed-air actuated humidity that is imported by introducing port 10.

In fact, according to the flow chart shown on Fig. 5, the standard operation of full flow is changed to the energy-conservation transportation of few flow.

That is to say, from beginning to begin standard operation to step S1.Carry out the transition to step S2 by this standard operation, the humidity of the dry air that detection dew cell 23 provides.

In step 3, acceptance is calculated to be dew-point temperature (dew point under the pressure) Ta from the control circuit 25 of the detection signal of dew cell 23.Then, at step S4, the dew-point temperature Ta of the setting dew-point temperature that control circuit 25 will be stored in advance (dew point under the pressure) Ts and calculating compares.

Being less than or equal at the dew-point temperature Ta that calculates and setting dew-point temperature Ts, is "Yes" during Ta≤Ts promptly, to step S5 transition, and beginning energy-saving operation as described later.If the dew-point temperature Ta that calculates is a "No" then greater than setting dew-point temperature Ts, turn back to the standard operation of step S1.

Fig. 7 illustrates first example of energy-saving operation control.

For example, the setting dew-point temperature Ts of storage in advance in the control circuit 25 is decided to be dew point under the pressure-40 ℃, the dew-point temperature Ta of calculating is equal to or less than this setting dew-point temperature Ts, then exports the commencing signal of energy-saving operation.

Switching valve 28 picture carries out the conversion of the removal moisture drying of the removal moisture drying of A tube 3 and B tube 4 as described above with two minutes intervals.Then, with to the conversion of the removal moisture drying of A tube 3 substantially the time consistent, open scavenging valve 27 carries out the regeneration of B tube 4 and removes, and after this, makes scavenging valve 27 closures, boosts.After two minutes, with to the conversion of the removal moisture drying of B tube 4 substantially the time consistent, carry out the regeneration of A tube 3 and remove, after this boost.

Because load is minimum or to import compressed-air actuated humidity extremely low, so dew-point temperature drops to-45 ℃ by-40 ℃.And then, the conversion and control of switching valve 26 was carried out with the interval in 2 minutes continuously, and air bleeding valve 27 is kept closed.After this, Shi compressed air imports A tube 3 and B tube 4 substantially equably.Each 3,4 interior adsorbent 17 plays suction-operated with being equal to mutually.The degree of drying of the dry air that therefore, provides does not change and keeps constant.

Because the closure of scavenging valve 27, the removing of being separated the moisture absorption branch by adsorbent 17 has not had, so dew-point temperature Ta gently rises by-45 ℃.After the conversion of this switching valve 26 was carried out with period demand (for example 3 cycles: 12 minutes), scavenging valve 27 was open.

This scavenging valve 27 is open, for example only carries out with 1 cycle of switching valve 26.That is to say,, carry out the regeneration of B tube 4 and remove in that to change substantially the time consistent with the removal moisture drying of A tube 3; In that to change substantially the time consistent with the removal moisture drying of B tube 4, carry out the regeneration of A tube 3 and remove.

Therefore, by carrying out the removal moisture drying in the energy-saving operation repeatedly, then each 3,4 interior wet branch that are detained of A, B are eliminated, and the adsoptivity of adsorbent 17 has recovery to a certain degree.After this, recover the conversion of the above-mentioned switching valve 26 of continuous control and the closure of the scavenging valve in the period demand 27 once more.

By the conversion to this energy-saving operation, the removing amount has reduced, and energy dissipation has reduced.So, owing to carry out each removing of 3,4, so with the aging Min. that controls to of adsorbent 17 by each period demand.

When the compressed-air actuated humidity that imports to original state at load restoration rises once again, compare with setting dew-point temperature Ts, the dew-point temperature of calculating has uprised.Therefore control circuit 25 controls return to the standard operation of the above-mentioned full flow that has illustrated once more.

Even return to standard operation, but since in the energy-saving operation A, B each in 3,4 with removal moisture drying continuously equably, so almost not variation of resulting dry gas dew point in each removal moisture drying operation.

In addition, each the aging of adsorbent 17 in 3,4 of A, B carries out equably in energy-saving operation, therefore when needs are changed, then can change each adsorbent in 3,4 of A, B simultaneously.

Illustrated more than that load is minimum and energy-saving operation that compressed air removal moisture drying can be supplied with on a small quantity, the energy-saving operation of flow in the what is called between the standard operation of the full flow of the energy-saving operation of this few flow and above explanation will be described below.

As shown in Figure 8, with per two minutes conversion switching valves 26, alternately carry out each removal moisture drying operation in 3,4 of A, B continuously.On the other hand, when having judged that the dew-point temperature Ta that is calculated is equal to or less than setting dew-point temperature Ts, enter energy-saving operation.That is to say, with the conversion of the removal moisture drying of A tube 3 substantially the time consistent, make scavenging valve 27 closures, the regeneration of interrupting B tube 4 is removed.

But because load be to a certain degree big, so 4 remove by interrupting regeneration, dew-point temperature Ta compares with setting dew-point temperature Ts and uprises.Therefore, make with the conversion of the removal moisture drying of B tube 4 substantially the time consistent, open scavenging valve 27 carries out the regeneration of A tube 3 and removes.

Do like this, make dew-point temperature Ta compare step-down once more with setting dew-point temperature Ts, institute so that with the conversion of the removal moisture drying of A tube 3 substantially the time consistent, make scavenging valve 27 closures, interrupt the regeneration removing of B tube 4.

Below, the energy-saving operation of middle flow is changed in 4 cycles in each 3,4 the removal moisture drying of A, B to switching valve 26, when dew-point temperature Ta compares rising with setting dew-point temperature Ts, decontrols scavenging valve 27, carries out corresponding each regeneration of 3,4 and removes.Thus, do one's utmost to control dew point variation when turning back to standard operation etc., identical with few flow energy-saving operation discussed above.

Have again, though do not illustrate especially in the drawings, even according to condition in the energy-saving operation of few flow, also can carry out according to the order of sequence.

That is to say, more than said a spot of energy-saving operation, though each removal moisture drying of 3,4 of the A of switching valve 26, B conversion all is that to carry out switching valve 26 by per 4 cycles open, be not limited to this point.

With the setting dew-point temperature Ts of storage in advance, especially with low value as depressing dew point-60 ℃ or-80 ℃ etc. in standard, the removal moisture drying of switching valve 26 conversion also can per 6 cycles or open scavenging valve 27 of 8 cycles and then carry out the energy-saving operation of few flow.

Fig. 9 illustrates second example of energy-saving operation control.Identical with above-mentioned situation, provide the commencing signal of energy-saving operation.

Switching valve 28 is to change the removal moisture drying of A tube 3 and the removal moisture drying of B tube 4 every two minutes.So, make with to the conversion of the removal moisture drying of A tube 3 substantially the time consistent, open scavenging valve 27 carries out the regeneration of B tube 4 and removes, and after this, makes scavenging valve 27 closures, boosts.After two minutes, with the conversion of the removal moisture drying of B tube 4 substantially the time consistent, carry out the regeneration of A tube 3 and remove, after this boost.

Because load is minimum or to import compressed-air actuated humidity extremely low, so dew-point temperature is reduced to-45 ℃ by-40 ℃.And then, the conversion and control of switching valve 26 is carried out continuously with two minutes interval, but scavenging valve 27 is kept closed.Thus, wet compressed air imports A tube 3 and B tube 4 substantially equably, and each 3,4 interior adsorbent 17 plays suction-operated mutually equably.The degree of drying of the dry air that therefore, provides does not change and keeps constant.

Wet branch owing to the closure of scavenging valve 27 by adsorbent 17 desorbs has not had, so dew-point temperature Ta slowly rises by-45 ℃.After the conversion of such switching valve 26 is carried out with period demand (for example 3 cycles: 12 minutes), in 1 cycle of conversion of two 3 of next A, B, 4 removal moisture drying, control scavenging valve 27.

That is to say, with beginning change-over period of switching valve 26 be benchmark, at the 4th periodic Control scavenging valve 27.Specifically, consistent in time substantially with the conversion of A tube 3 removal moisture drying, carry out the regeneration of B tube 4 and remove, consistent in time substantially with the conversion of the removal moisture drying of B tube 4, carry out the regeneration removing of A tube 3.

Thus, owing to carry out removal moisture drying in the energy-saving operation repeatedly, so remove each wet branch that is detained in 3,4 of A, B forcibly, the adsoptivity of adsorbent 17 returns to certain degree.

After this, the conversion and control of continuous once more above-mentioned switching valve 26 is carried out the control of the scavenging valve 27 in per 4 cycles.Carrying out in the above-mentioned energy-saving operation variation of above-mentioned pattern not taking place continuously.

Carry out so-called energy-saving operation, the removing amount is reduced and the minimizing energy consumption.So, because every period demand is to each compulsory removing of adsorbent in 3,4, so can be with the aging Min. that controls to of adsorbent 17.

When the compressed-air actuated humidity that imports to original state at load restoration rises once more, compare, calculate dew-point temperature and uprise, so control circuit 25 returns to the standard operation of the full flow of above explanation once more with the dew-point temperature Ts that sets.

Even return to standard operation, carried out the step for regeneration to A, B wet branch each 3,4 adsorbent, 17 equalization, the Compulsory Removal desorb in energy-saving operation, therefore the dew point of resulting dry air does not almost change.

In addition, in energy-saving operation,, when therefore needing to change, then can change each adsorbent 17 in 3,4 of A, B simultaneously because each the aging of adsorbent 17 in 3,4 of A, B is that equalization is carried out.

Also have, in stopping the energy-saving operation of step for regeneration discussed above, to each removal moisture drying of 3,4 conversion of A, B of switching valve 26 with the open scavenging valve 27 of per 4 periodic Control, but not office in being limited to this.

The 3rd illustration of control when Figure 10 A, (B) change for expression is energy-conservation.

Shown in Figure 10 (A), per 5 cycles are changed in removal moisture drying, also can control open scavenging valve 27, and this periodicity for example can judge that the corresponding with it various conditions of load condition can change aptly according to the air dew point after the adsorption dry.

Also have, in energy-saving operation, may not be limited to the conversion of each removal moisture drying of 3,4 of switching valve 26A, B is alternately carried out.For example, also can be shown in Figure 10 (B), closed scavenging valve 27 stops step for regeneration, simultaneously switching valve 26 is changed to B tube 4 by A tube 3, directly keeps this state to carry out energy-saving operation.

But, even in this state, also must be with the open scavenging valve 27 of period demand control, each adsorbent 17 in 3,4 is carried out Compulsory Removal equably, this also is natural.

The 1-3 according to the present invention is in so-called energy-saving operation, by two absorbing cylinder continuous dehumidifying dryings Conversion, and after the regeneration that stops each removing, suppress on a small quantity the dry air of removing simultaneously Discharge rate, and make equably the adsorbent of two absorbing cylinders aging. Control returns to standard fortune The variation of the dew-point temperature between each absorbing cylinder when turning to has improved reliability. Make simultaneously two absorption The adsorbent replacing time in the tube becomes simultaneously carries out, and has avoided invalid replacing, has played helping In the effect that reduces operating cost.

The 4-6 according to the present invention in so-called energy-saving operation, carries out each absorption with period demand After the compulsory removing of adsorbent of tube, keep on a small quantity the discharge rate of the dry air of removing, with The time adsorbent that carries out equably in two absorbing cylinders aging, each absorption when suppressing to return to standard operation Dew-point temperature between the tube changes and improves reliability, and the adsorbent in two absorbing cylinders is changed Time is for carrying out simultaneously, thereby avoided wasteful replacing, plays to help to reduce operating cost Deng effect.

Claims (4)

1. the dehumanization method of a Compressed Gas, be to make wet Compressed Gas import the drying process that a side in two absorbing cylinders of filling adsorbent carries out adsorption and dehumidification, separate by adsorbent with importing in the opposing party's that wettability power descends in the drying process of previous stage the absorbing cylinder that moisture absorption divides and the step for regeneration the wet branch of desorb removed by absorbing cylinder carries out concurrently by the part of the resulting dry gas of this drying process, this drying process and step for regeneration alternately change and provide continuously the dehumanization method of the Compressed Gas of dry gas between two absorbing cylinders, it is characterized in that, has under specified criteria continuous drying operation alternately between two absorbing cylinders, stop the operation of the wet branch of desorb simultaneously by each absorbing cylinder removing; And described specified criteria is set dew-point temperature (dew point under the pressure) Ts for dew-point temperature (dew point under the pressure) Ta by the resulting dry gas of drying process is equal to or less than.

2. the dehydrating unit of a Compressed Gas, be to comprise two absorbing cylinders and access that is communicated with two absorbing cylinders by translation building block and removing member of filling adsorbent, the absorbing cylinder adsorption and dehumidification that wet Compressed Gas is imported a side carries out drying, the part of this dry gas is imported the opposing party's absorbing cylinder, separate the moisture absorption branch and the wet branch of desorb is removed regeneration side by side by absorbing cylinder by the adsorbent that adsorption capacity descends in previous stage by removing member, by between two absorbing cylinders, alternately changing dry according to the conversion of above-mentioned translation building block and regenerating and also supply with the dehydrating unit of the Compressed Gas of dry gas continuously, it is characterized in that, have under specified criteria, conversion translation building block and alternately removal moisture drying continuously of Compressed Gas between two absorbing cylinders continuously to wetting, control simultaneously stops the control member to the removing member of each absorbing cylinder, and described specified criteria is set dew-point temperature (dew point under the pressure) Ts for dew-point temperature (dew point under the pressure) Ta by the resulting dry gas of drying process is equal to or less than.

3. the dehumanization method of a Compressed Gas, be to make wet Compressed Gas import the drying process that a side in two absorbing cylinders of filling adsorbent carries out adsorption and dehumidification, separate by adsorbent with importing in the opposing party's absorbing cylinder that adsorption capacity descends in the drying process of previous stage that moisture absorption divides and the step for regeneration the wet branch of desorb removed by absorbing cylinder carries out concurrently by the part of the resulting dry gas of this drying process, this drying process and step for regeneration be alternately conversion between two absorbing cylinders, and supply with the dehumanization method of dry gas continuously, it is characterized in that, under specified criteria, when stopping the energy-saving operation of described step for regeneration, in this energy-saving operation, carry out step for regeneration with the given cycle; And described specified criteria is set dew-point temperature (dew point under the pressure) Ts for dew-point temperature (dew point under the pressure) Ta by the resulting dry gas of drying process is equal to or less than.

4. the dehydrating unit of a Compressed Gas, be to comprise two absorbing cylinders and access that is communicated with two absorbing cylinders by translation building block and removing member of filling adsorbent, the absorbing cylinder absorption that wet Compressed Gas is imported a side is coated with the wet drying of carrying out, the part of this dry gas is imported the opposing party's absorbing cylinder, separate the moisture absorption branch and remove regeneration concurrently by absorbing cylinder by the adsorbent that adsorption capacity descends in previous stage by the wet branch of exhaust component desorb, alternately conversion is dry with regeneration and supply with the dehydrating unit of dry gas continuously between two absorbing cylinders in conversion by above-mentioned translation building block, it is characterized in that, have under specified criteria, when stopping the energy-saving operation of described step for regeneration, in this energy-saving operation, control is carried out the controller member of step for regeneration with period demand, and described specified criteria is set dew-point temperature (dew point under the pressure) Ts for dew-point temperature (dew point under the pressure) Ta by the resulting dry gas of drying process is equal to or less than.

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