CN103842723B

CN103842723B - Without separator boiler

Info

Publication number: CN103842723B
Application number: CN201380003243.4A
Authority: CN
Inventors: 增田幸一; 田中孝典
Original assignee: Miura Co Ltd
Current assignee: Miura Co Ltd
Priority date: 2012-03-16
Filing date: 2013-02-27
Publication date: 2015-09-09
Anticipated expiration: 2033-02-27
Also published as: US20160084496A1; JP2013194950A; JP5534253B2; WO2013136988A1; US20150047580A1; CA2867455A1; CA2867455C; CN103842723A

Abstract

The invention provides one without separator boiler, it can obtain desired aridity, and anti-antipriming pipe is overheated, and then reduces the corrosion risk of boiler drum.Described possess without separator boiler: downcomer (84), and upper tank (24) interior bottom is communicated with bottom water tank (22) by it, controlling organization (70), it carries out the first control and second and controls, first control be when the sensed water level detected by external water level testing agency (50) more than during the first designated water level to make the mode of the reduction of water level in boiler drum control water supply mechanism (60), to make the mode that in boiler drum, water level rises control water supply mechanism (60) when second control is below the second designated water level that sensed water level becomes lower than the first designated water level, first designated water level is set as aridity boundary water level, and set the height of upper tank, make to utilize the first control to become more than setting aridity to make the aridity of the steam flowed out from upper tank, second designated water level to be set as more than degree of superheat boundary water level and the recycle ratio of the boiler water based on downcomer (84) to be set to the water level of more than setting value.

Description

Without separator boiler

Technical field

What the present invention relates to a kind of boiler drum possesses the few boiler of the water yield.No. 2012-060540, the Japanese Patent Application that the application filed an application to Japan based on March 16th, 2012 and CLAIM OF PRIORITY, and here cite its content.

Background technology

As described in Patent Document 1, link between upper tank and bottom water tank in the boiler (possessing water yield boiler less) of the boiler drum structure of the low state in the upper end that forms, become when the burning of burner stops the water table ratio water pipe in described water pipe at the multiple water pipes heated by burned device, when the water level in water pipe is too high, boiling in water pipe becomes fierce, many water droplets and steam are together discharged from upper tank, exist and cannot obtain the such problem of the high steam of aridity.On the other hand, when the water level in water pipe is too low, the aridity of boiler drum outlet rises, but the top that can produce water pipe because the heat of burning is overheated the problem of distortion etc.And then when the combustion load change of boiler, its water level is also different, therefore guarantees that aridity uprises, it is very difficult also can not to produce overheated water level.

And then the aridity of possessing less in water yield boiler is also subject to the concentrated impact of the water (boiler water) in water pipe.When because of evaporation, boiler water concentrates, increase with the water droplet amount that steam accompanies due to the foaming (foaming) of boiler water, under identical water level, aridity reduces further.

In order to tackle such problem, existing boiler possesses separator.The steam of low aridity flows into separator from upper tank, carries out the so-called carbonated drink of the moisture removing in low aridity steam to be separated in this separator.Then, from separator, steam high for aridity is supplied to load-side.

At first technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2010-78204 publication

Brief summary of the invention

Invent problem to be solved

But the making possessing the separator that structure is such disclosed in patent document 1 is more difficult, and then the position checked after making is more etc., therefore, when being formed as the structure possessing separator, producing cost and uprising such problem.On the other hand, when being formed as the structure not possessing separator, existing and cannot obtain the such problem of the steam of desired aridity.

Summary of the invention

The present invention completes based on above-mentioned situation, its object is to, there is provided a kind of do not possess separator without separator boiler, and provide a kind of and can obtain desired aridity, can anti-antipriming pipe overheated so that reduce boiler drum corrosion risk, possess the water yield few without separator boiler.

Solution

The present application completes in view of above-mentioned problem, the invention that first aspect is recorded provides a kind of without separator boiler, this possesses without separator boiler: boiler drum, its multiple water pipes heated by burned device link between upper tank and bottom water tank and form, when the burning of described burner stops, becoming the state that the upper end of water pipe described in the water table ratio in described water pipe is low; Water supply mechanism, it for supplying boiler feed water in described boiler drum; External water level testing agency, it is arranged on the outside of described boiler drum, be communicated with the inner space of described upper tank and the inner space of described bottom water tank respectively via communicating pipe and boiler drum inside and outside water level is detected, controlling organization, it controls the action of described water supply mechanism according to the sensed water level detected by described external water level testing agency, it is characterized in that

Described also possess the downcomer be communicated with described bottom water tank bottom in described upper tank without separator boiler,

Described controlling organization carries out the first control and second and controls, and the first control is: when the sensed water level detected by described external water level testing agency is more than the first designated water level, with the action making the mode of water level reduction in boiler drum control described water supply mechanism; Second control is: time below the second designated water level that described sensed water level becomes lower than described first designated water level, with the action making the mode of water level rising in boiler drum control described water supply mechanism,

Described first designated water level is set as aridity boundary water level, and set the height of described upper tank, make to utilize described first to control to make the aridity of the steam flowed out from described upper tank become more than setting aridity, described second designated water level to be set as more than degree of superheat boundary water level and the recycle ratio of the boiler water based on described downcomer to be set to the water level of more than setting value.It should be noted that, " will exceed " and replace with " more than " and " below " " deficiency " will be replaced with, be also contained in the present invention.

According to the invention that first aspect is recorded, described first designated water level is set as aridity boundary water level and sets the height of described upper tank, make to utilize described first to control to make the aridity of the steam flowed out from described upper tank become more than setting aridity, even if therefore be the aridity that also can maintain regulation without separator.In addition, described second designated water level to be set as more than degree of superheat boundary water level and the recycle ratio of the boiler water based on described downcomer to be set to the water level of more than setting value, thus can either anti-antipriming pipe overheated while can maintain again the recycle ratio of the boiler water of regulation by means of the circulation of the boiler water of described downcomer.

In addition, the invention that second aspect is recorded, on the basis of first aspect, is characterized in that, according to any one in the enrichment of described boiler cylinder pressure, supply water temperature, boiler water or multiplely adjust described first designated water level and/or the second designated water level.

According to the invention that second aspect is recorded, except the effect that the invention recorded except first aspect produces, also can realize following effect: even if the such effect of any one or multiple aridity that also can maintain regulation of changing in the enrichment of described boiler cylinder pressure, supply water temperature, boiler water and/or can either anti-antipriming pipe overheated while can maintain again the such effect of the recycle ratio of regulation.

In addition, the present invention that the third aspect is recorded is on the basis of first aspect, it is characterized in that, the detection of described first designated water level and described second designated water level is undertaken by the electrode shared, based on described first designated water level of described controlling organization judgement described electrode have water detect after carry out immediately or own water detect carry out after the first setting-up time, the judgement of described second designated water level is carried out immediately or carries out after the second setting-up time from anhydrous detection after the anhydrous detection of described electrode.

According to the invention that the third aspect is recorded, except the effect that the invention of first aspect record produces, also can realize following effect: by adjusting each setting-up time, can maintain the such effect of the aridity of regulation and/or can either anti-antipriming pipe overheated while can maintain again the such effect of the recycle ratio of regulation.

And then, the present invention that fourth aspect is recorded is on the basis of first aspect, it is characterized in that, described external water level testing agency possesses the first electrode of detection first designated water level and detects the second electrode of the second designated water level, based on described first designated water level of described controlling organization judgement described first electrode have water detect after carry out immediately or own water detect carry out after the 3rd setting-up time, the judgement of described second designated water level is carried out immediately or carries out after the 4th setting-up time from anhydrous detection after the anhydrous detection of described second electrode.

According to the invention that fourth aspect is recorded, except the effect that the invention of first aspect record produces, also can realize following effect: by the first electrode and second electrode of described external water level testing agency, can maintain the such effect of the aridity of regulation and/or can either anti-antipriming pipe overheated while can maintain again the such effect of the recycle ratio of regulation.

Invention effect

According to the present invention, can provide a kind of and can obtain desired aridity, can anti-antipriming pipe overheated so that reduce boiler drum corrosion risk, possess the water yield few without separator boiler.

Accompanying drawing explanation

Fig. 1 is the brief configuration figure of the longitudinal profile of the structure of the boiler represented involved by embodiments of the invention 1.

Fig. 2 is the flow chart of the control sequence that embodiment 1 is described.

Fig. 3 is the flow chart of another control sequence that embodiment 1 is described.

Fig. 4 is the brief configuration figure of the longitudinal profile of the structure of the boiler represented involved by embodiments of the invention 2.

Fig. 5 is the schematic diagram of the external water level checkout gear of boiler involved by embodiments of the invention 3.

Fig. 6 is the brief configuration figure of the longitudinal profile of the schematic construction of the boiler represented involved by embodiments of the invention 4.

Detailed description of the invention

Embodiment 1

Below, with reference to figure 1 for involved by embodiments of the invention 1, the boiler that do not possess separator (is called without separator boiler, below simply referred to as boiler.) 10 to be described.

The structure > of < embodiment 1

As shown in Figure 1, boiler 10 possesses: boiler drum 20; The burner 30 that can switch between height burning and low burning; Refractory piece 40; External water level checkout gear 50; Supply-water pump 60; Control part 70.Among these, boiler drum 20 using boiler barrel cover 21, bottom water tank 22, water pipe 23 and upper tank 24 as main structural element.

Among these, sheet material is formed as cylindrical shape and forms by boiler barrel cover 21, covers water pipe 23 and by this water pipe 23 and external isolation.Bottom water tank 22 is formed as the ring-type of hollow, is connected with feed pipe 80 at this bottom water tank 22 place, can supply boiler feed water via this feed pipe 80 lower portion water tank 22.In addition, at bottom water tank 22, place is also connected with main drainpipe 81, and this main drainpipe 81 is provided with main draining valve 82.By opening this main draining valve 82, the boiler water of the inner space 22A be present in bottom water tank 22 externally can be discharged.At this, boiler water is the boiler feed water that the inside (bottom water tank 22, water pipe 23 etc.) pointing to boiler drum 20 imports.

Further, bottom water tank 22 is connected with the lower end side of water pipe 23.This water pipe 23 is communicated with respectively with upper tank 24 with bottom water tank 22 and stores the tubular element of boiler water.In addition, by utilizing the burning of burner 30 to carry out heating pipe 23, the boiler water of the inside of this water pipe 23 is seethed with excitement.Each water pipe 23 vertically extends in FIG.In the present embodiment 1, water pipe 23 is configured with multiple.The center existed in the arrangement of above-mentioned water pipe 23 along the radial direction from boiler drum 20 is left outside water pipe row 23A that first of the first radius circumferentially configures and is left the inner side water pipe row 23B that second of second radius less than the first radius circumferentially configure along the center of the radial direction from boiler drum 20.But water pipe 23 is not limited to have outside water pipe row 23A and inner side these two row of water pipe row 23B, can only have row, also can have more than three row.

In addition, the upper end side of each water pipe 23 is connected to upper tank 24.Because under the effect of boiling phenomenon that produces in water pipe 23, the bubble that generates and steam together flow into upper tank 24.Upper tank 24 and above-mentioned bottom water tank 22 are identically formed the ring-type into hollow.At this, in the following description, the space of the inside of the formation hollow of upper tank 24 is set to inner space 24A.This inner space 24A is communicated with the opening portion 23s of water pipe 23, on the other hand, is communicated with the opening portion 83s of the main steam pipe 83 flowed out for steam.In addition, in the following description, the space of the inside of the formation hollow of bottom water tank 22 is called inner space 22A.

As mentioned above, the structure of the boiler drum 20 in the present embodiment 1 is linked multiple water pipe 23 by vertical between bottom water tank 22 with upper tank 24 and formed.

So, upper tank 24 in the present embodiment 1, by the combination of water lev el control (first controls) maintained with aridity described later, more will set larger by the size in vertical direction than bottom water tank 22 and existing upper tank 24 in the mode making the aridity of steam be set to more than setting aridity.That is, in the boiler 10 in the present embodiment 1, although do not arrange separator, the function that upper tank 24 is separated to the carbonated drink of carrying out described separator and playing is made.Therefore, in the inner space 24A of upper tank 24, in order to play the function that carbonated drink is separated, become inner space 22A than bottom water tank 22 more by the larger-size structure in vertical direction.

So, the size increased in the vertical direction of the inner space 24A of upper tank 24 refers to the distance of stream increased from the opening portion 23s to the opening portion 83s of the main steam pipe 83 be connected with the end face of upper tank 24 of the water pipe 23 of the bottom surface being positioned at upper tank 24.Further, between two opening portions the distance of the stream of (between opening portion 23s with opening portion 83s) expansion with realize the function that carbonated drink is separated and be associated.

At this, in existing upper tank 24, the size of the vertical direction of the size of the vertical direction of its inner space 24A and the inner space 22A of bottom water tank 22 becomes same degree.Correspondingly thereto, as shown in Figure 1, the upper tank 24 in the present embodiment 1 becomes more than the large structure of the size in the vertical direction of bottom water tank 22 space closer to the inner portion 24A.Specifically, the height of the inner space 24A of upper tank 24 becomes the height in order to obtain following distance (time), and described distance (time) is that the drop of diameter tens μm contained in steam overcomes the steam of rising and from steam, is consequently separated required distance (time) by gravitational settling.Such as, when the rate of climb of steam is about 0.1 ~ 0.5m/sec, in order to the height dimension obtaining the inner space 24A required for desired aridity (setting aridity) is bottom line 200mm.

But, typically, the performance that known carbonated drink is separated has following rule: the speed of the steam of rising is slower, performance more improves, if the height of inner space 24A is higher in addition, performance more improves, but in the present embodiment 1, when the height of inner space 24A is below 200mm, water droplet is separatory deficiency of time from steam, cannot obtain the aridity of desired steam at outlet (opening portion 83s) place of boiler drum 20.On the other hand, when the height of inner space 24A is more than 700mm, can with enrichment it doesn't matter ground obtain desired by aridity.But, because of the difference of the enrichment of boiler water, even if also desired aridity can be obtained when the height of inner space 24A is between 200mm to 700mm.Therefore, when the height of inner space 24A is set to more than 700mm, owing to making size cross quantitative change greatly, because weight increase etc. can not become compact structure, thus unfavorable in cost.

Thus, the size in the vertical direction of the inner space 24A of above-mentioned upper tank 24 needs for more than aridity height threshold or the size larger than aridity height threshold.At this, aridity height threshold refer to for make the steam (steam-water mixing fluid described later) of discharging from inner space 24A become desired aridity, the threshold value of size the vertical direction of inner space 24A.This aridity height threshold is obtained by experiment etc.

Further, the inner space 24A of ring-type among upper tank 24, hollow is provided with spoiler 25.Spoiler 25 in the present embodiment 1 to make direction, plate face be located at inner space 24A with the mode that the direction vertical with vertical direction is parallel.

At this, (in the following description, be steam-water mixing fluid by the moisture address contained by steam and steam there is not the moisture covered contained by steam and steam from opening portion 23s to opening portion 83s.) component when, there is moisture and steam together towards the possibility that the opening portion 83s of main steam pipe 83 linearly flows into property.But when inner space 24A is located at by spoiler 25, from opening portion 23s to opening portion 83s, steam-water mixing fluid is covered flowing by spoiler 25.Thus, the moisture contained by steam-water mixing fluid can not linearly flow on property ground, and steam and spoiler 25 collide, and then the moisture zoarium thus in steam falls.In addition, compared with there is not the situation of spoiler 25, be in the state of spended time till steam arrives opening portion 83.Therefore, there is gravity fall because of spended time till arrival opening portion 83s or be attached to the inwall etc. of spoiler 25 or upper tank 24 in the major part of the moisture contained by steam, becomes the state of the opening portion 83s not arriving main steam pipe 83 thus.That is, spoiler 25 forms the stream extending mechanism that the stream of advancing to steam-water mixing fluid extends.As mentioned above, spoiler 25 has the function improving the performance that carbonated drink is separated further.

To this, describe the details of the shape of spoiler 25, when top view spoiler 25, this spoiler 25 is set in the form of a ring.That is, spoiler 25 is arranged in the roughly whole region of the annular section of inner space 24A.Further, between the outer circumferential side and inwall 24c of spoiler 25, gap A is provided with.On the other hand, at the inner circumferential side place of spoiler 25, the methods such as welding are utilized to be installed on inwall 24c at multiple position along its circumference.Therefore, the inner circumferential side of spoiler 25 with among inwall 24c, the position that do not utilize the method such as to weld to install has gap B.Wherein, the interval of gap B is less than the interval of gap A.

But, also can replace the structure shown in Fig. 1, such as, be provided with the spoiler 25 along with tilting downward towards outer circumferential side from inner circumferential side.In this case, also preferably in spoiler 25, be provided with the gap same with above-mentioned gap A at the outer circumferential side of bottom with between inwall 24c, gap that also can be same by the gap B with above-mentioned is arranged between the inner circumferential side of spoiler 25 and inwall 24c.In addition, the spoiler 25 along with tilting downward from outer circumferential side towards inner circumferential side can be also provided with.In this case, also preferably in spoiler 25, be provided with the gap same with above-mentioned gap A between the inner circumferential side of bottom with inwall 24c, gap that also can be same by the gap B with above-mentioned is arranged between the outer circumferential side of spoiler 25 and inwall 24c.

And then replace above-mentioned structure, spoiler 25 is not structure in the form of a ring, is not namely present in the roughly whole region of annular section of inner space 24A, and can be the structure in arc-shaped yet.This structure is the structure making spoiler 25 be present in the part in the annular section of inner space 24A.In this case, also can in the end of circular arc, outer circumferential side or inner circumferential side arrange lack part.

So spoiler 25 is positioned at upper side in the inner space 24A of upper tank 24.Therefore, for the moisture in steam-water mixing fluid when arriving spoiler 25, compared with being positioned at the situation of lower side with this spoiler 25, the moisture being positioned at the situation of upper side become because of gravity fall, to the collision of inwall 24c the state that reduces.In addition, when the steam-water mixing fluid that moisture like this is reduced and spoiler 25 collide, steam-water mixing fluid can not flow towards opening portion 83s linearity, correspondingly becomes the state that cost arrives the time of opening portion 83s.As mentioned above, by spoiler 25 being located at the upper side of inner space 24A, the performance that the carbonated drink of spoiler 25 is separated improves further.

At this, installation site for spoiler 25 is described, in such a configuration, the upper side of inner space 24A is located at by spoiler 25, but the structure that the place of the threshold value of the size in the vertical direction of position, i.e. the inner space 24A of aridity height threshold illustrated in the first above-mentioned embodiment is located at by spoiler 25 is also suitable according to being embodied as.

On the other hand, the limit positions of upper side when being provided with spoiler 25 again can not be involved in (can not be attracted) such height dimension by the moisture of the upper surface being stranded in spoiler 25 and determine by the steam flowed out from opening portion 83s.That is, the upper limit position of the installation site of spoiler 25 is set in the position at the interval maintaining regulation between the top board face of inner space 24A.

So in FIG, the bottom of the inner space 24A of upper tank 24 is communicated with the upper end side of downcomer 84.This downcomer 84 makes boiler water (when this boiler water is in concentrated mostly) the lower portion water tank 22 being present in inner space 24A return.Therefore, the lower end side of downcomer 84 is communicated with the inner space 22A of bottom water tank 22.Further, be connected with concentrated drainpipe 85 at this downcomer 84, this concentrated drainpipe 85 is provided with concentrated draining valve 86.By opening this concentrated draining valve 86, the boiler water after concentrated externally can be discharged.At this, whether be condensed into need the judgement of the boiler water of the degree of discharging to carry out in the following way, namely utilize the electrical conductivity determination sensor (omitting diagram) to electrical conductivity measures to measure the electrical conductivity of the boiler water being present in downcomer 84.

Further, burner 30 is provided with in the upper side of boiler drum 20.Burner 30 is positioned at the annular distance (omission Reference numeral) of the formation ring-type of upper tank 24, and in the inside of boiler barrel cover 21, surrounded surrounding by water pipe 23 inner side (being set to combustion chamber 21A below) forms flame.In order to the burning in the 21A of this combustion chamber, supply the air of fuel and burning to burner 30.In addition, refractory piece 40 is provided with in the lower side of boiler drum 20.By the bottom of the inaccessible boiler drum 20 of refractory piece 40 (part (water pipe diameter shrinkage part) residing for the lower side of water pipe 23 and than its part in the inner part), make thus to become combustion chamber 21A than inner side water pipe row 23B by radial central side.Further, refractory piece 40 is also arranged on the part (water pipe diameter shrinkage part) residing for upper side in the upper side of the inner side of boiler barrel cover 21, water pipe 23.

Then, external water level checkout gear 50 is the devices detected the water level of the boiler water of the inside importing to boiler drum 20 (bottom water tank 22, water pipe 23 etc.).This external water level checkout gear 50 possesses: water lev el control cylinder 51; Multiple electrode, i.e. the first electrode 52M and the second electrode 52S.The water level that first electrode 52M is used for when burning to height controls, and the second electrode 52S is used for controlling water level during low burning.Water lev el control cylinder 51 utilize can conducting metal and be formed as the substantially cylindrical shape of closed at both ends.The upper end of this water lev el control cylinder 51 is connected with the lower end of communicating pipe 87a, and the upper end of communicating pipe 87a is connected with the inner space 24A of upper tank 24.In addition, the bottom of water lev el control cylinder 51 is connected with the upper end of communicating pipe 87b, and the lower end of communicating pipe 87b is connected with the inner space 22A of bottom water tank 22.Thus, the upper end of water lev el control cylinder 51 and bottom are communicated with water pipe 23 respectively via upper tank 24 and bottom water tank 22, thus realize the water level in the boiler identical with the boiler water imported to water pipe 23 in the inside of water lev el control cylinder 51.

Further, voltage is applied to the first electrode 52M and between the second electrode 52S and water lev el control cylinder 51.Further, according to the change of the voltage before boiler water and the first electrode 52M and the second electrode 52S during end in contact, the water level in water lev el control cylinder 51 is detected.

Then, supply-water pump 60 is connected with bottom water tank 22 via feed pipe 80, when under the control at control part 70 during action, starts lower portion water tank 22 and supplies water.Further, the feed pipe 80 between bottom water tank 22 and supply-water pump 60 is provided with check-valves 89, prevents the boiler water supplied from bottom water tank 22 side direction supply-water pump 60 side adverse current.

Control part 70 is transfused to the detection signal of the various sensors from external water level checkout gear 50 grade, and manages the action of the driving part of burner 30, supply-water pump 60 etc. according to this detection signal and based on the water lev el control order of preliminary election storage.This water lev el control order comprises high burning water level control sequence and the control sequence of low burning water level.

(control sequence of high burning water level)

High burning water level control sequence (Fig. 2 illustrates an example) is configured to carry out the first control and second and controls, this first control is: when the sensed water level that the first electrode 52M by external water level checkout gear 50 detects exceedes high combustion the first designated water level H1, (stopping) supply-water pump 60 is closed to make the mode that in boiler drum 20, water level reduces, this second control be: when sensed water level become than height fire the low height of the first designated water level H1 fire the second below designated water level H2 time, open (driving) supply-water pump 60 in the mode making water level in boiler drum 20 increase.

High combustion the first designated water level H1 is set as the water level (high burning aridity boundary water level) that cannot maintain setting aridity when height burns when water level rises above since then.In addition, the height of upper tank 24 is set as utilizing the first control to make the aridity of the steam flowed out from upper tank 24 become more than setting aridity.And then, high combustion the second designated water level H2 to be set as when height burns when water level reduces following since then as more than the overheated water level (high burned temperature boundary water level) of water pipe, the water level that the recycle ratio of the boiler water based on downcomer 84 is set to more than setting value (setting recycle ratio).It should be noted that, setting recycle ratio when height burn and low burning time be set as identical, but also can difference.

And, in the present embodiment 1, the judgement that height based on control part 70 fires the first designated water level H1 is carried out after too high combustion first setting-up time T1H in the water detection that has from the first electrode 52M, and the judgement of high combustion the second designated water level H2 is carried out after the anhydrous detection from the first electrode 52M after too high combustion second setting-up time T2H.

(control sequence of low burning water level)

Low burning water level control sequence (Fig. 3 illustrate one example) is configured to carry out the first control and second and controls in the same manner as high water level control sequence of burning, this first control be: when the sensed water level that the second electrode 52S by external water level checkout gear 50 detects exceed fire the high low combustion first designated water level L1 of the first designated water level H1 than height time, supply-water pump 60 is closed to make the mode that in boiler drum 20, water level reduces, this second control be: when sensed water level become lower than low combustion first designated water level L1 and the low combustion second designated water level L2 below higher than high combustion the second designated water level H2 time, supply-water pump 60 is opened to make the mode that in boiler drum 20, water level rises.

Low combustion first designated water level L1 is set as aridity boundary water level during low burning.In addition, the height of upper tank 24 is set as more than the setting aridity utilizing the first control to make when becoming low burning from the aridity of the steam of upper tank 24 outflow.And then low combustion second designated water level L2 is set as more than as described degree of superheat boundary water level, the recycle ratio of the boiler water based on downcomer 84 to be set to more than described setting value water level.

And, in the present embodiment 1, judgement based on the low combustion first designated water level L1 of control part 70 is carried out after too low combustion first setting-up time T1L in the water detection that has from the second electrode 52S, and the judgement of low combustion second designated water level L2 is carried out after the anhydrous detection from the second electrode 52S after too low combustion second setting-up time T2L.

(setting of recycle ratio)

At this, the setting for the second recycle ratio controlled is described.When recycle ratio is low, supply the pH step-down of the part of the water supply having pH low in bottom water tank 22, the risk of corrosion raises.Correspondingly thereto, when making recycle ratio uprise, the water supply that pH is low and by downcomer 84 lower portion water tank 22 supply pH high boiler water mixing can make remain suitable pH in boiler drum 20 and reduce corrosion risk.And then the mixing of the water supply low by temperature and the high boiler water of temperature, can be set to higher Temperature Distribution by boiler water entirety, thus can reduce the corrosion risk caused by dissolved oxygen.

Recycle ratio is defined by (evaporation capacity+precipitation)/(output).Evaporation capacity is the vapor stream output from upper tank, and precipitation is the amount of the boiler water (recirculated water) flowed down by downcomer.At this, when evaporation capacity=output, along with precipitation increase, recycle ratio becomes large.

Described second controls to be the structure for the purpose of the recycle ratio improving boiler water, is also by make mode that in boiler drum 20, water level rises be set to water level be reduced to the structure of target circulation than the sequential of designated water level to the sequential controlling supply-water pump 60, the sequential that is about to be judged as being reduced to after first controls the second designated water level of water level in boiler drum 20.Target circulation is set to the water level higher than the overheated overheated boundary water level prevented of water pipe 23 than designated water level.

As mentioned above, target circulation is the water level set for obtaining setting recycle ratio than designated water level, but recycle ratio is set to less than 2 in direct current cooker.Correspondingly thereto, in the boiler 10 of the present embodiment 1, target circulation is than suitably setting in the scope of the following stated.The corrosion risk that the lower limit of setting recycle ratio causes based on the pH in boiler drum 20 and dissolved oxygen concentration sets.In addition, when recycle ratio is excessive, aridity boundary water level is difficult to control, therefore the higher limit of setting recycle ratio is set by aridity boundary.Further, in the boiler 10 of the present embodiment 1, such as, when recycle ratio being set to below 2 as direct current cooker when the water high relative to corrosivity, corrosion risk uprises, therefore desirably is set to the as far as possible large value below more than the higher limit of 2.

< is about the action > of embodiment 1

First, the function that the carbonated drink for the boiler 10 with above such structure is separated is described, and is then described for based on the aridity of water lev el control and the control of recycle ratio.The explanation of the function that following carbonated drink is separated is to carry out the state of the water lev el control (first controls) of setting aridity described later maintenance as prerequisite.

(function that carbonated drink is separated)

Make supply-water pump 60 action, to water pipe 23, boiler water is supplied water to the height of regulation, burner 30 is burnt, now, boiler water boiling in water pipe 23, the steam containing water droplet (drop) flows into from the opening portion 23s of water pipe 23 to the inner space 24A of upper tank 24.This influx changes according to the water level controlled based on first.Further, steam the bubble produced because of boiling, bumping and curl up rising water droplet together with under the state of steam, the outlet (opening portion 83s) towards boiler drum 20 is flowed.

At this, in the present embodiment 1, size in its vertical direction is set to the height of following distance (time) by upper tank 24, and this distance (time) is that the water droplet (drop) in order to obtain diameter tens μm contained in steam overcomes the steam of rising and from steam, is consequently separated required distance (time) by gravitational settling.Because of the difference of the rate of climb of steam, size in the vertical direction needed needs to change, but in the present embodiment, when the rate of climb of steam is such as about 0.1 ~ 0.5m/sec, the size in the vertical direction of inner space 24A is set to 200mm ~ 700mm.Thus, the opening portion 83s from the opening portion 23s of water pipe 23 to main steam pipe 83, in the process that steam-water mixing fluid rises, under gravity, water droplet (drop) contained in steam falls, thus can obtain desired dryness fraction of steam.

In addition, upper tank 24 is compared with existing upper tank 24, and the size in the vertical direction of inner space 24A sets larger.Thereby, it is possible to elongated the path that the chien shih steam-water mixing fluid of the opening portion 83s from the opening portion 23s of water pipe 23 to main steam pipe 83 is advanced (stream is long).Therefore, the major part in the moisture contained by steam be attached to upper tank 24 inwall or because of the effect of gravity whereabouts etc., thus to be removed by from steam.

Further, by increasing the size in the vertical direction of the inner space 24A of upper tank 24, the steam and the spoiler 25 that remove ratio in the steam-water mixing fluid of the moisture in devaporation, regulation to a certain extent collide.Thus, the attachment of moisture in steam is in spoiler 25, and these moisture are fit and because of gravity fall, thus removed by moisture from steam.

In addition, because spoiler 25 is present in the inner space 24A of upper tank 24, in the inner space 24A of upper tank 24, steam-water mixing fluid linearly can not flow to property towards opening portion 83s, correspondingly becomes the state that cost arrives the time of opening portion 83s.Especially, want the steam-water mixing fluid of vertically linearly advancing to property from the opening portion 23s of water pipe 23 towards the opening portion 83s of main steam pipe 83 or want to become because of the existence of spoiler 25 avoiding spoiler 25 and the state be involved in towards during the opening portion 83s of main steam pipe 83 with the steam-water mixing fluid of advancing close to this linear state of advancing.Thus, steam-water mixing fluid becomes the state arriving opening portion 83s spended time, and therefore, the attachment of moisture contained by steam is in inwall 24c or fall because of the effect of gravity.So, the moisture in steam can be removed well by arranging spoiler 25.

As mentioned above, after the steam-water mixing fluid after most moisture removing is come the top of spoiler 25, and after locating also to be removed to a certain extent by moisture from steam above spoiler 25, the opening portion 83s of main steam pipe 83 is come.Then, when coming this opening portion 83s, become the steam of desired aridity, this steam via main steam pipe 83 to needing the supply destination of heat supply to carry.

(control of the aridity of water lev el control when burning based on height)

Then, the control of aridity when burning for height according to Fig. 2 is described.In the following description, burner 30 is set to and continues high burning.Step SN (below, is only called SN in step S1 by control part 70.) in determine whether to detect that anhydrous (water level not detected) is by too high combustion first setting-up time T1H (the second controlled condition) from the first electrode 52M.When being judged as YES in S1, in S2, open supply-water pump 60.So the water level in boiler drum 20 rises.

In S3, determine whether to be tested with water (water level being detected) by too high combustion second setting-up time T2H (the first controlled condition) from the first electrode 52M.Rise along with the water level in boiler drum 20, when being judged as YES in S3, being judged as reaching high combustion the first designated water level H1, moving to S4 and close supply-water pump 60.Consequently, prevent water level in boiler drum 20 from exceeding high combustion the first designated water level H1, therefore maintain the aridity (such as, more than 0.98) of regulation by the carbonated drink separation function of upper tank 24.

It should be noted that, fire when the second setting-up time T2H supposes high burning highly enriched to the height of closing supply-water pump 60 and be set.More specifically, when enrichment uprises, aridity reduces, therefore needs to reduce water level.Thus, it is expected that adjust the second setting-up time T2H according to the enrichment mode that setting-up time is shorter to make enrichment higher of boiler water.Enrichment can utilize the enrichment sensor (omitting diagram) to the enrichment of burning time or boiler water detects to detect.

(control of the recycle ratio of water lev el control when burning based on height)

Then, the control of recycle ratio when burning for height according to Fig. 2 is described.In S4 when closing supply-water pump 60, the water level in boiler drum 20 declines gradually.In S1, when use from height the first electrode 52M detect anhydrous after through too high combustion first setting-up time T1H time, be judged as YES, be namely judged as in boiler drum 20 that water level reaches high combustion the second designated water level H2, move to S2 and open supply-water pump 60.Consequently, the running of boiler 10 can be carried out with the recycle ratio of regulation.

(control during low burning running)

In addition, water lev el control when the low burning of boiler 10 operates controls according to the control sequence of Fig. 3.When low burning running, when burning with height, difference is, because the boiling of boiler water is more weak, therefore utilizes low the second electrode 52S used to flood on the whole, controls aridity, the water pipe degree of superheat, recycle ratio.Identically with the control sequence of Fig. 2, S1, S2, S3, S4 of Fig. 2 are corresponding with S11, S12, S13, S14 of Fig. 3 respectively for the flow process controlled, therefore it illustrates omission.

(effect of embodiment 1)

According to the boiler 10 of the embodiment 1 of structure such above, even if in the non-existent structure of separator, also upper tank 24 and described water lev el control can be utilized, by the steam of desired aridity (setting aridity) to the conveying of supply destination.Therefore, in boiler 10, with the Accessory Members of the pipeline that there is not separator and be connected with upper tank 24 by separator etc. correspondingly, the cost needed for making of cost that the material needed for these separators and Accessory Members is correlated with and separator and Accessory Members can be reduced.

In addition, in the boiler 10 of the present embodiment 1, the size in the vertical direction of the inner space 24A of upper tank 24 sets larger than bottom water tank 22 and existing upper tank 24.Thus, the path (stream is long) that steam-water mixing fluid can be made to advance the opening portion 83s from the opening portion 23s of water pipe 23 to main steam pipe 83 is elongated, therefore, it is possible to make the major part in the moisture contained by steam be attached to upper tank 24 inwall or because of gravity effect whereabouts etc. and remove.That is, by making the size in the vertical direction of upper tank 24 larger than bottom water tank 22 and existing upper tank 24, the function that carbonated drink is separated can be played thus well.

In addition, in the boiler 10 of the present embodiment 1, the inner space 24A of upper tank 24 is located at by spoiler 25.Therefore, steam-water mixing fluid and spoiler 25 collide, and the rate of climb due to the existence of spoiler 25 in the inner space 24A of steam-water mixing fluid is slack-off.Thereby, it is possible to by water droplet (drop) removing in steam-water mixing fluid, thus the aridity of steam can be improved.That is, due to the setting of spoiler 25, from steam-water mixing fluid, moisture can be removed further well.

And then, in the present embodiment 1, owing to second designated water level H2, L2 to be set as the water level higher than the overheated overheated boundary water level prevented and target circulation are than designated water level, thus can anti-antipriming pipe overheated so that with regulation recycle ratio carry out water lev el control.Consequently, the water supply that pH is low and the high boiler water of pH that lower portion water tank 22 supplies by downcomer 84 moderately mix will remain suitable pH in boiler drum 20 and can reduce corrosion risk.And then the mixing of the water supply low by temperature and the high boiler water of temperature, can be set to higher Temperature Distribution by boiler water entirety, thus the corrosion risk that dissolved oxygen causes can be reduced.

(variation of embodiment 1)

In embodiment 1, the detection of the first designated water level and the second designated water level is undertaken by electrode 52M, 52S of sharing, based on the first designated water level of control part 70 judgement self-electrode 52M, 52S have water to detect to carry out after setting-up time, the anhydrous detection of judgement self-electrode 52M, 52S of the second designated water level through setting-up time through after carry out.But, the judgement that also can be configured to the first designated water level electrode 52M, 52S have water to detect after carry out immediately or carry out immediately after the judgement of the second designated water level anhydrous detection at electrode 52M, 52S.

Embodiment 2

Then, according to Fig. 4, embodiments of the invention 2 are described.In the present invention, adjustment aim recycle ratio designated water level can be carried out according to any one in the enrichment of boiler cylinder pressure, supply water temperature, boiler water (water in boiler drum) or multiple (two or three).The more high maintenance being more conducive to aridity of its value of boiler cylinder pressure, but be unfavorable for the maintenance of the recycle ratio specified and overheated preventing.For supply water temperature and boiler water enrichment antithesis, the more high maintenance being more unfavorable for aridity of its value, but be conducive to the maintenance of the recycle ratio specified and overheated preventing.Thus, target circulation uprises during pressure increase in boiler drum than designated water level, the step-down when rising to the supply water temperature of boiler drum or the enrichment of boiler water.That is, decline (reduction) along with pressure increase in boiler drum and along with the enrichment of supply water temperature or boiler water, the first designated water level and the second designated water level are uprised.

In the present embodiment 2, as shown in Figure 4, utilize the pressure sensor 90 to pressure (steam pressure) in boiler drum 20 detects to detect, and utilization detect to the temperature sensor 100 that the temperature of the water supply in feed pipe 80 detects.Further, the first described setting-up time and the second setting-up time is adjusted according to detected pressures and detected temperatures.Specifically, along with pressure increase in boiler drum 20 and along with supply water temperature decline, in advance (shortening the first setting-up time), the sequential time delay (extending the second setting-up time) that supply-water pump 60 cuts out, makes water level rise to the sequential that supply-water pump 60 is opened thus.

In order to realize this structure, such as, by the change that is set with according to boiler cylinder pressure and supply water temperature and the target circulation changed is stored in memory in advance than the form of designated water level.Further, from this form, read the target circulation corresponding with the boiler cylinder pressure detected and supply water temperature than designated water level, and carry out based on the water lev el control of this target circulation than designated water level, thus can realize.It should be noted that, boiler water enrichment such as can detect at the bottom place of downcomer.

According to this embodiment 2, even if boiler cylinder pressure and supply water temperature change also can maintain the recycle ratio of regulation.

Embodiment 3

Then, according to Fig. 5, embodiments of the invention 3 are described.Embodiment 1 utilizes the electrode shared to carry out the detection of the first designated water level and the second designated water level, and embodiment 3 utilizes different electrodes to carry out the detection of the first designated water level and the second designated water level.Namely, height as external water level checkout gear 50 fires the first electrode 52M and possesses the first electrode 52M1 detecting high combustion the first designated water level H1 and the second electrode 52M2 detecting high combustion the second designated water level H2, based on the first designated water level H1 of control part 70 judgement from the first electrode 52M1 have water detect after carry out immediately or own water detect carry out after too high combustion the 3rd setting-up time, the judgement of the second designated water level H2 is carried out immediately or carries out after too high combustion the 4th setting-up time from anhydrous detection after the anhydrous detection of the second electrode 52M2.In addition, as external water level checkout gear 50 low combustion second electrode 52S and possess the first electrode 52S1 of detecting low combustion first designated water level L1 and detect the second electrode 52S2 of low combustion second designated water level L2, based on the low combustion first designated water level L1 of control part 70 judgement from the first electrode 52S1 have water detect after carry out immediately or own water detect carry out after too low combustion the 3rd setting-up time, the judgement of low combustion second designated water level L2 is carried out immediately or carrying out after too low combustion the 4th setting-up time from anhydrous detection after the anhydrous detection of the second electrode 52S2.

In this embodiment 3, also according to any one in the enrichment of boiler cylinder pressure, supply water temperature, boiler water or multiplely can adjust each setting-up time.By formation like this, even if any one or multiple change in the enrichment of boiler cylinder pressure, supply water temperature, boiler water also can maintain the recycle ratio of regulation.

Embodiment 4

Then, the boiler 10 of embodiments of the invention 4 is described according to Fig. 6.The present invention can not only as the above embodiments 1 ~ embodiment 3, be applicable to the boiler that multiple water pipe 23 is arranged in the boiler drum structure of the structure of ring-type, also similarly can be applicable to the boiler 10 shown in Fig. 6 like that, by multiple water pipe 23 with the boiler being the structure that the mode of rectangular shape arranges.In the explanation of following embodiment 4, be described centered by the structure different from embodiment 1, identical Reference numeral marked to the structural element corresponding with embodiment 1 and the description thereof will be omitted.

From the viewpoint of saving spatialization etc., boiler 10 shown in Fig. 6 possesses boiler drum 20, and this boiler drum 20 is by rectangular-shaped bottom water tank 22, identical rectangular-shaped upper tank 24 and be made up of the water pipe group formed based on the multiple water pipes 23 vertically arranged between this two water tank 22,24.In the water pipe group forming this boiler drum 20, for the water pipe 23 be configured in outside two on long side direction, adjacent water pipe 23 connects via coupling member (omitting diagram) and forms a pair water wall (omitting diagram) separately from each other.Thus, boiler drum 20 possesses the rectangular-shaped division room formed by bottom water tank 22, upper tank 24 and a pair water wall.This division room is equivalent to the combustion chamber 21A in above-mentioned each embodiment, and the flame of burner 30 from the end side being located at long side direction carries out combustion reaction and flows towards waste gas outlet 103 simultaneously.

In the boiler 10 shown in this Fig. 6, though omit diagram to be provided with the downcomer 84 identical with above-mentioned each embodiment.That is, be configured to have the bottom water tank 22 of new boiler feed water to be connected by downcomer 84 with supplying the hydropexic upper tank of boiler 24 after concentrated, thus make the boiler water Natural Circulation in upper tank 24.At this, the water lev el control of the boiler 10 shown in this Fig. 6 carries out in the same manner as the above embodiments 1, and description is omitted.

The present invention is not limited to the above embodiments 1 ~ 4.Such as, in the above-described embodiment, the situation of spoiler 25 is adopted to describe for as stream extending mechanism.But stream extending mechanism is not limited to spoiler 25.Such as, labyrinth mechanism can be set at the inner space 24A of upper tank 24, the inner space 24A of upper tank 24 also can be made fine to be divided into make entrance and exit from minizone and the stream in the advancing of steam-water mixing fluid is extended.In addition, in order to carry out carbonated drink separation, trickle cancellous filter also can be set.

In addition, also can be configured to, utilize not based on electrode can change setting water level level sensor (such as, differential pressure pick-up) carry out the water level detecting of external water level checkout gear 50, when making target circulation than designated water level change itself and water level is reduced to the target circulation after change than designated water level, open supply-water pump 60.

Description of reference numerals is as follows:

10 ... boiler

20 ... boiler drum

22 ... bottom water tank

23 ... water pipe

24 ... upper tank

25 ... spoiler

30 ... burner

50 ... external water level checkout gear (external water level testing agency)

52M ... first electrode

52S ... second electrode

60 ... supply-water pump (water supply mechanism)

70 ... control part (controlling organization)

80 ... feed pipe

84 ... downcomer

Claims

1. one kind without separator boiler, this possesses without separator boiler: boiler drum, its multiple water pipes heated by burned device link between upper tank and bottom water tank and form, and when the burning of described burner stops, becoming the state that the upper end of water pipe described in the water table ratio in described water pipe is low; Water supply mechanism, it for supplying boiler feed water in described boiler drum; External water level testing agency, it is arranged on the outside of described boiler drum, be communicated with the inner space of described upper tank and the inner space of described bottom water tank respectively via communicating pipe and boiler drum inside and outside water level is detected, controlling organization, it controls the action of described water supply mechanism according to the sensed water level detected by described external water level testing agency, it is characterized in that

Described first designated water level is set as aridity boundary water level, and sets the height of described upper tank, makes to utilize described first to control to make the aridity of the steam flowed out from described upper tank become more than setting aridity,

Described second designated water level to be set as more than degree of superheat boundary water level and the recycle ratio of the boiler water based on described downcomer to be set to the water level of more than setting value.

2. according to claim 1ly to it is characterized in that without separator boiler,

According to any one in the enrichment of described boiler cylinder pressure, supply water temperature, boiler water or multiplely adjust described first designated water level and/or the second designated water level.

3. according to claim 1ly to it is characterized in that without separator boiler,

The detection of described first designated water level and described second designated water level is undertaken by the electrode shared,

Based on described first designated water level of described controlling organization judgement described electrode have water detect after carry out immediately or own water detect carry out after the first setting-up time, the judgement of described second designated water level is carried out immediately or carries out after the second setting-up time from anhydrous detection after the anhydrous detection of described electrode.

4. according to claim 1ly to it is characterized in that without separator boiler,

Described external water level testing agency possesses the first electrode of detection first designated water level and detects the second electrode of the second designated water level,

Based on described first designated water level of described controlling organization judgement described first electrode have water detect after carry out immediately or own water detect carry out after the 3rd setting-up time, the judgement of described second designated water level is carried out immediately or carries out after the 4th setting-up time from anhydrous detection after the anhydrous detection of described second electrode.