JPS59180271A - Air liquefying method utilizing cold heat of liquefied natural gas - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for liquefying carbon air by using the cold energy of liquefied natural gas (Jmeth, abbreviated as L-NG). Utilizes the cold energy of NG efficiently,
Liquefied air (hereinafter abbreviated as 1-Δ) is J, S4111.
-+S1~T: Gate to the manufacturing method (ru, 1 [-N How to liquefy air using the cold energy of G? Who is it? -J' T-Ni Special Report 1977 1'163726 ,
! However, these methods are
It is effective to make full use of the cold energy of GJl-N when the amount of G used is constant, but if it fluctuates during the use of LNG, it is effective to use the cold energy of LNG. Fully utilized: There are some drawbacks. In other words, such an air liquefaction method is suitable for, for example, Cascoupin power generation if'>
Always use air for auxiliary combustion 11.1 Combustion FI III 1. NG
(7) Cold heat wo f'J Kawa L/'Ciff II
? Torushi' (,13 ki, during the peak of electricity demand △
It is used when using air 11 to produce photoelectric power by intensively using air, but in this case, NO
The use of fA fJ almost corresponds to the power demand7, and as shown in the graph of Figure 1, it is large in the daytime from 9:00 to 1704, and is large at night at 20:00. The amount used is 330...40%, and the average value Pa is about 70%.9 If there is such a fluctuation, ING's 1a heat can be stably recovered. for,
Worst messenger! From l En P min *) -11
1-ka k 小いp ++ wo, lA'2MJ::i J
C is set as a constant amount to ensure that the daily average amount (1-)a
) is 70% C11]0 is taken as 35%, the cooling and heat consumption is 50% -C, which has the drawback that the production of I△1-λ1~ is expensive.

S1] Figure 2 shows C, 1, -N during JILA manufacturing.
The following is an example of a change in the power source for production (according to the ratio of G usage).
．． In the case of NG/kat A, the electric power original character I0 is approximately 0.
1 /+ 2 l<w II/'kgl△, this is 0, 8 kc+ L N G / kq l-△do f Rudo++ JO, 206Kw l-1/kgLA-
b/i) The importance of effectively recovering the cold energy of NO should be emphasized.

Therefore, 13min from Pmax in FIG.
In the case of recovering cold heat from l and C, the fluctuation of 65% is reduced to 1
! It is necessary to complete the bow. This is done by bypassing a part of the JIPM in this gas compressor [! Otherwise, it has to be discharged, resulting in a loss of power of 11゛). To absorb the loss of power without power loss, install multiple compressors and operate one of these compressors. °+L,
The disadvantage is that it requires 7J, 5J, and operation, and requires a lot of construction time.

This invention (,↓In view of the circumstances of article 1-(was made (゛,
LNG usage tβ at demand destinations such as thermal power plants
There is a fluctuation (-, but this fluctuation occurs.) It is possible to almost completely recover the cooling energy of the G ('J, (I℃=
It is possible to remove 1A with one stroke, and then 5H2 (5,
+", easy to apply 7: Utilize the cold energy of THRUING! Our purpose is to provide a method for converting air into D4.

A detailed description of the invention is given below with reference to the drawings.

Figure 3 shows an example of the air liquefaction method of this defense. 3 is sent to the LNG source air purification device 4, where it is removed from the moisture and carbon scum in the air. There is a method of transferring part of the cold heat to a heating medium such as gas, and using this to cool the raw material η1. , N
G is in contact with Pl! (C
Sa/+7J, Shiishino(-aru,.

The raw Fl air purified in this way is sent from the tube 5 to the pre-cooling heat exchanger 6, where a heating medium is added to (1) and
℃? :) i'+'s 11 (JF', "air exchanges heat, and the air from the intermediate stage of the 9ν air compressor 8 is passed through the C pipe 7 to the suction side of the 1F compressor 8. After passing through the pumped air (, L, ze, 194
Ly, IJ211
J: Re”+” Kiki l contraction fil! 80) Second stage k
It supply, rTi (y compressed 3, conventional liquefaction 711 method ((, I air (, 1, ] 5...25 ata to 11 width), but in this example (4; 1. l N G ) iu
In order to withstand the fluctuations of the river /i:, a natural waste compressor (a natural waste compressor) is used to withstand the fluctuations in the LNG is I-
, N G's demand destination) J is vaporized by silicon power and heated 1, Therefore, it is necessary to compress the air to a higher pressure in order to make the liquefied particles of the air in the IJ. l:I-shi, here I
This high-pressure air is compressed to about 5O-70aLa and is guided through the pipe 12 to the -C heat exchanger 1ζ3 (here), and is cooled by the heat medium described above, and a portion of the air from 1/l is passed through the pipe. 15
Through r l-N G heat Q 1% j to vessel 17! ,'＋
j) 1 will be. -ji, LNG heat exchanger 17 (J is l
NGI! A fabric corresponding to the average usage amount 1]a shown in FIG. will be sent. In the l-, NG heat exchanger 17, as shown in Fig. 4, the -C high-pressure air is heated to bl or (,)2 J, :) with ING heat. exchange and exchange heat Φ
Give and receive Q+ or IJ Q 2 (d1 attack α1251,
ζ Cold] 1. The heat exchange end point Δ of l-, NG is 1.
Set to match the saturated product 1rLt/＼ of 11 forces, f'B 4;
31, Δ2 points i'J- (gas chemistry determines 1). This heat exchanger is 2 kI N (shoulder) 2, tube 7'I8/J eyes I NO ha...l-Noah/I 9 to 3
9, -11 is stored. Zoshi [, Konori, NG
Saved on 7/19 7. : LNG is
Demand destination 1. - N (3) The flow rate of the liquid component is adjusted by the valve 51 according to the flow rate of the liquid, and the liquid component is transferred to the LNG vaporizer 5/I via the O, J 2, and the gas component is armpit 53
The LNG is led to the vaporizer 54 through the
No, did you warm yourself? ') From 57? lff will be sent to the required destination.

INO) The high-pressure air that was pumped by the cold 7J1 with the AC 1st attack device 17 was
↑U through τ'19, T'F', from 16 to heat exchanger 18, join to 1F air (〈t), connect tube 21 and connect to heat exchanger 22't-further (cooled, Through the tube 23,
1lij Closure valve 2/I expands the air 11 to the intermediate stage pressure of the compressor 8 and partially liquefies it! I will. Then, in the C1 gas-liquid separator 26, this air is separated into gas and liquid, and the gaseous air is passed through the pipe 27.
, heat exchanger 22.1τ2ε), heat exchanger 18.1°τ2
9, 1△ joins the raw stone air through pipe 3o, and L/
\Supercooling and superheating 1, where it is superheated by 7ff+,'
i′ ore 32. ,33.3)5), through valve 3/l
ΔStorage IW'j /I3), and the storage is reduced. .

Also, part of this 1-Δ is ('j 30 (' 1
Sent to lti water valve ζ17, popular here near Ir N1
, (-l1ii'!, WtX ICf decreases and LA
It is sent to superheating 31, where C above 1△ is cooled with hot water I L,
It vaporizes and passes through the heat exchanger 22, tube 40, heat exchanger 18, and tube 11, and the temperature is about 0℃ in the cold heat exchanger 6. JJI is discharged. This JJI discharged air is used as a regeneration gas for the raw material 1'; 1 air 1'^ manufacturing neck 1.

Therefore, the demand destination's usage L NG , 7+ is 1-, the average speed is 1''aJ: Sub, L NG B-) i'
L N G is stored in /l 9 and conversely used L N a
When the early speed is high, it is L N G buffer '19i was crushed.
G. Vaporization? jg 5 /Iwo sutra (demand!; nilj,
i*c'! 4' Do. Then, like this, LNG
・Vaporizer5. Although the LNG m produced by I L,:j9 varies, the amount of heat medium commensurate with this variation is supplied to the LNG vaporizer 54. Despite the cover,
Heat storage tank 5F) to pipe j)9, circulation 1ζ''; Bon f I;
0, tube [31 through 'Ct, N O vaporizer 5'l l
J) Heat that can be entered 1! Iho (,1, circulation pump 6 C1
By adjusting the discharge flow rate of +I, the flow rates of J and C are adjusted, and the heat storage tank 58 is adjusted to correspond to the fluctuation of ING: β.
The I-NG gas is placed in a 5/l tank, the temperature changes, the cold heat of the NG is removed, and 100% of the l is recovered.
G1L i1 (thirsty) - (through tube 62 (storage!)
Returned to 4+M 58. This causes C to fluctuate L-N
The cold heat of G is stored in the heat storage tank 58.

The low-temperature 41(
N 63, circulation tube 164, tube 6
5 is red (3:j (exchanger 13, pre-cooling heat exchanger 6, original 1'
l Cold heat is distributed and supplied to the air viscous device 4, and when the temperature reaches room temperature, it is passed from the pipe 7F5 to the pipe 4? It is returned to the heat tank 58. , In this case, if the humidity of the heat medium of the heat exchanger jφZ413 is close to the heat storage tank 58, the temperature of the body (4J tube 68,
The pipe 72 and valve 7 are connected without passing through the pipe 70 and 'i'τ71 system.
3. C7: Return the heat medium to the heat tank 58 via n74.

According to the 1st L of 3'', Uf air liquefaction]) method, the demand destination's I
I-NG usage will be introduced into LNG Batsunoa 49
When exceeding the NG (Pa) limit, the LNG is stored in the LNG buffer 49, or the NG is sent to the customer at the same time.
It is C' to supply, and the coldness of ING of many mothers is heat 911
J, -)' (stored in the heat storage tank 58, L, N G
The convenience character is 塘, and the cold energy supplied to the heat medium has decreased 1
It is easy to use the stored cold energy of C11-A manufacturing process 1], N G heat exchanger 17, heat exchanger 13, The cold heat exchanger 6 is always supplied with +1:'1-:1 cold heat.
Each heat exchanger 17. 'lC1゜6 operates stably in a constant state and is a great tool! 1 ((Raccoon) , this fluctuation, N (Ko's cold crab I4 (Ko, it is possible to recover almost 100%, 1Δ electric power generator (0 can be reduced).

Figure 5 shows the 11. ) quantitative 1
2 motion and corresponding L N C, buffer: i' 49
LNGI! From the change in fluid level a3 and the change in thermal storage tank 58 (fU heating element 1 x wood, heat exchanger 1 - thermal medium 1 (graph C 1, this graph)), the l-NG usage amount is the average (When the temperature drops below a, 1., N G is stored in the INO buffer 49, the low-temperature heat medium in the diluted heat tank 58 decreases, and 1; 1 heat medium F11?) 11 is added. 3. Also, when 1NGfffi Kawahaya goes around the average value Pa once, )φ
1-, IsuG decreases, the low temperature heat medium Φ of the heat storage tfli 58 increases, and the room temperature heat medium decreases 3゜Figure 6 shows the air liquefaction of this invention. The second example of the ll method (・1, this example rlJ, I-NG buffer/
The diagram shows the system for sending LNG from I9 to the demand destination, LNG pressure pump 51', and expansion turbine ε.
) 0, generator 81, heater 83 make up 4M, I-N Q
i+',,i li! It is possible to recover the power by cycle. The expansion turbine 80
It is possible to adjust the capacity in the range of 10% to 140% by adopting a variable nosultizoone.
7 shows a modification of the embodiment shown in FIG. 3, in which intermediate cooling of the air compressor 8 is possible. The number of stages is increased and the power of the air compressor 8 is reduced.

J Meg below shows examples i' L: 1. 1〕　　〔　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　” -Rus de', next article! Liquefied air was produced under 1C. .

Maximum usage of LNG (pmax) 61 T on, Minimum usage of old NG (RIltin) 22, 2 Ton/br Average usage of LNG (Pa) 4 'I, ', 'J T'(ill/'Original Fl Air Q 26,0OONTl'/l+r Air liquefaction m 20.00ONTn'/l+r Air liquefaction temperature -180℃ Capacity of ING buffer 49 1ε3 Q T on heat medium) [1-12 Heat storage tank 58 -110TC heat storage tank 5 for low temperature heat medium
Room temperature heat medium temperature of 8 - 9℃ LNG vaporizer 54
Amount of heat medium sent to 95 to 26 O-T-on/hr Amount of heat medium sent to air liquefaction process 192 tons/hr average 1
, 7/Ikaz example qC, liquefied air power atom I'
I was 0.1,',3 K w Ll/kg.

1 of this invention explained below. , N Due to the air liquefaction method that does not use cooling heat (J, LNG (7) at the demand site, there is a temporal fluctuation in the use of L N (,, ll), and this fluctuation, It is possible to almost completely recover the cold heat generated by G4I, and this can be used in the right column without air liquefaction.
It has the ability to significantly reduce the cost of 1 to 1,
In addition, 1-1'J (J to absorb the fluctuations in the cooling/heating ratio due to the fluctuations in 15 to the
The movable parts that can respond to the large fluctuations in L and NG are the near i and c of the heating medium circulation cylinder 1, and the equipment J3 and Easy to drive and construction

[Brief explanation of the drawing]

Figure 1 is a graph showing the fluctuation of ING usage over time;
The figure shows ΔElectric Power Source and L゛NG I#i''17/[
Graph showing the relationship between ΔA and liquefaction eddy current by changing -C, 3rd
(Figure 4 is a system diagram showing m pieces of air liquefaction method of this invention, Figure 4 is a graph showing the heat exchange between LNG and air (color stripes 1'l), Figure 5 is a graph showing the variation in the use of NG. and the corresponding L N
Figure 6 shows another example of this invention; , FIG. 7 shows a modification of the method shown in FIG. 3 (it is a system diagram of the main parts).
Air purification device, 6... Pre-cooling heat exchanger, 8...
... Air Y1 condensation PQ, 133 ... Heat exchanger,
17...ING heat exchange 1 so:), I B...
... Heat exchanger, 22 ... Heat exchanger, 2/l.
...inflation, ) valve, 26... gas-liquid separator,
31...1-△Superheater, 37...Expansion valve, 43...LA storage tank, '14...N G vaporizer, 57... ...Tube, 58...
Heat storage tank, 60... Circulation ponzo, 61...
・Tube, 62...Tube, 6/l...tb
'i-ring pump, 67... pipe, 038...
・Pipe, 70... Suga, 71... Arm, 75
······tube. Applicant Chubu Electric Power Co., Inc.]-1 Water Oxygen Co., Ltd. Figure 1

Claims (1)

[Claims] Geno'11 Using the cold energy of liquefied natural gas to convert air to 'C+f
1.'! Condensed, then cooled with liquefied natural gas to avoid liquefaction, liquefied air was heated for 1 hour, and the vaporized liquefied natural gas was supplied to the destination for H'1 liquefaction. In the air liquefaction method that uses the cold energy of natural gas (-1) If there are fluctuations in the amount of liquefied natural gas used at the consumption destination, the average value of the fluctuating amount of liquefied natural gas is received in the storage tank (). The raw air is liquefied into this liquefied natural gas at J, ), and the amount of liquefied natural gas requested by the consumer is delivered from the storage tank to B, and this liquefied natural gas is transferred to a liquefied natural gas vaporizer. C Avoid heat exchange with the heat medium and transfer cold energy to the second heat medium!j
In addition, by supplying and circulating this low-temperature heat medium to a heat storage tank (which stores the window) as a cooling source to the cold energy utilization part of the liquefied air production process, the consumption destination is vaporized. The average FI for 1φ of liquefied natural gas is -
The liquefied natural waste is stored in the above heat storage tank, and when the temperature during use is below the average value, the surplus cold stored in the heat storage tank is used. Dororo Liquefied Man? ((Air liquefaction method using the cold energy of waste.