CN115106133A - Movable ion exchange resin regeneration vehicle - Google Patents
Movable ion exchange resin regeneration vehicle Download PDFInfo
- Publication number
- CN115106133A CN115106133A CN202210902420.3A CN202210902420A CN115106133A CN 115106133 A CN115106133 A CN 115106133A CN 202210902420 A CN202210902420 A CN 202210902420A CN 115106133 A CN115106133 A CN 115106133A
- Authority
- CN
- China
- Prior art keywords
- ion exchange
- valve
- column
- hydrochloric acid
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008929 regeneration Effects 0.000 title claims abstract description 35
- 238000011069 regeneration method Methods 0.000 title claims abstract description 35
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000003456 ion exchange resin Substances 0.000 title claims abstract description 17
- 229920003303 ion-exchange polymer Polymers 0.000 title claims abstract description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000002253 acid Substances 0.000 claims abstract description 17
- 238000005342 ion exchange Methods 0.000 claims abstract description 17
- 239000011347 resin Substances 0.000 claims description 31
- 229920005989 resin Polymers 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 238000011001 backwashing Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000005341 cation exchange Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 210000001508 eye Anatomy 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
- B01J49/50—Regeneration or reactivation of ion-exchangers; Apparatus therefor characterised by the regeneration reagents
- B01J49/53—Regeneration or reactivation of ion-exchangers; Apparatus therefor characterised by the regeneration reagents for cationic exchangers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
- B01J49/60—Cleaning or rinsing ion-exchange beds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention discloses a movable ion exchange resin regeneration vehicle which comprises a hydrochloric acid tank and a shell, wherein an acid-resistant pump is mounted on the hydrochloric acid tank, a manual valve is mounted between the acid-resistant pump and the hydrochloric acid tank, the acid-resistant pump is connected with a check valve through a pipeline, the check valve is connected with a flowmeter, an ion exchange column, an intelligent conductivity meter and an external regeneration column through pipelines, an electric valve is arranged on the pipeline, a handle is arranged in the middle of the shell, a movable wheel is arranged at the bottom of the shell, a perspective window is arranged on the side face of the shell, and a control panel is arranged on one side far away from the handle. Compared with the prior art, the invention has the advantages that: greatly reduces the damage to the human body, improves the monitoring efficiency and has good market prospect.
Description
Technical Field
The invention relates to the field of thermal power generation, in particular to a movable ion exchange resin regeneration vehicle.
Background
The 'hydrogen conductivity' index needs to be detected in the monitoring of the steam-water quality of the boiler in the thermal power plant, namely, cation exchange is carried out by adding cation exchange resin at the front stage of the specific conductivity, which is called as 'hydrogen conductivity', and is called as 'hydrogen conductivity' for short. However, the ion exchange resin will be naturally disabled after exchanging for a period of time, and the resin losing the exchange capacity is soaked in 3-5% hydrochloric acid liquid for 40-60 minutes, which is called resin regeneration. The regenerated resin recovers the cation exchange capacity.
The current regeneration process is generally to discharge the resin in the ion resin column into a large plastic basin, and then add a prepared 3-5% HCL solution for soaking and stirring. The method is easy to be burnt by hydrochloric acid, volatile HCL gas is very pungent, respiratory tract, lung, eyes and the like are damaged, and the method is a hidden trouble of safe production.
Disclosure of Invention
The invention aims to solve the technical problem of providing a mobile ion exchange resin regeneration vehicle.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the utility model provides a portable ion exchange resin regeneration car, including sour case of shui acid and casing, install the acid-resistant pump on the sour case of shui acid, install manual valve between acid-resistant pump and the sour case of shui acid, the acid-resistant pump passes through the tube coupling check valve, the check valve passes through the tube coupling flowmeter, the ion exchange post, intelligent conductivity meter and external regeneration post, be equipped with electric valve on the pipeline, the casing middle part is equipped with the handle, the bottom is equipped with removes the wheel, the casing side is equipped with perspective window, the one side of keeping away from the handle is equipped with control panel.
As an improvement, the bottom of the hydrochloric acid tank is provided with an outlet, the periphery of the outlet is provided with a support, the top of the hydrochloric acid tank is provided with an upper cover, and the hydrochloric acid tank is provided with a concentration ratio indicating plate.
As the improvement, the top of the ion exchange column is provided with a backwashing port, the bottom of the ion exchange column is provided with a liquid inlet, the outer side of the top of the ion exchange column is provided with a resin funnel, and the outer side of the bottom of the ion exchange column is provided with a resin outlet.
As the improvement, the outer side of the external regeneration column is provided with an upper lantern ring, and the bottom of the external regeneration column is provided with a lower tray.
Compared with the prior art, the invention has the advantages that: the monitoring process of the steam-water quality of the whole boiler is fully automatically completed in the boiler, so that the damage to a human body is greatly reduced, the monitoring efficiency is improved, and the boiler has a good market prospect.
Drawings
Fig. 1 is a schematic structural diagram of a mobile ion exchange resin regeneration vehicle.
Fig. 2 is an external structural schematic diagram of a mobile ion exchange resin regeneration vehicle.
Fig. 3 is an external side view of a mobile ion exchange resin regeneration vehicle.
As shown in the figure: 1. the utility model discloses a water acid case, 1.1, the export, 1.2, the support, 1.3, the upper cover, 1.4, concentration ratio sign, 2, the acid-proof pump, 3, manual valve, 4, the check valve, 5, the flowmeter, 6, the ion exchange column, 6.1, the backwash mouth, 6.2, the inlet, 6.3, the resin funnel, 6.4, the resin export, 7, intelligent conductivity meter, 8, external regeneration post, 8.1, go up the lantern ring, 8.2, lower tray, 9, electric valve, 10, the casing, 11, the handle, 12, the removal wheel, 13, perspective window, 14, control panel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention is implemented in detail, the movable ion exchange resin regeneration vehicle comprises a hydrochloric acid tank 1 and a shell 10, wherein an acid-proof pump 2 is installed on the hydrochloric acid tank 1, a manual valve 3 is installed between the acid-proof pump 2 and the hydrochloric acid tank 1, the acid-proof pump 2 is connected with a check valve 4 through a pipeline, the check valve 4 is connected with a flowmeter 5, an ion exchange column 6, an intelligent conductivity meter 7 and an external regeneration column 8 through pipelines, an electric valve 9 is arranged on the pipeline, a handle 11 is arranged in the middle of the shell 10, a movable wheel 12 is arranged at the bottom of the shell, a perspective window 13 is arranged on the side face of the shell 10, and a control panel 14 is arranged on one side far away from the handle 11.
As the improvement, the bottom of the hydrochloric acid tank 1 is provided with an outlet 1.1, the periphery of the outlet 1.1 is provided with a support 1.2, the top of the hydrochloric acid tank 1 is provided with an upper cover 1.3, and the hydrochloric acid tank 1 is provided with a concentration ratio indicator 1.4.
As an improvement, the top of the ion exchange column 6 is provided with a backwashing port 6.1, the bottom of the ion exchange column is provided with a liquid inlet 6.2, the outer side of the top of the ion exchange column 6 is provided with a resin funnel 6.3, and the outer side of the bottom of the ion exchange column is provided with a resin outlet 6.4.
As the improvement, the outer side of the external regeneration column 8 is provided with an upper lantern ring 8.1, and the bottom of the external regeneration column is provided with a lower tray 8.2.
The working principle of the invention is as follows: the invention relates to a movable ion exchange resin regeneration vehicle, which consists of a water acid tank, an ion resin column, an acid-proof pump, a flowmeter, an intelligent conductivity meter, an external regeneration column and an electric valve F 3 ～F 14 Manual valve F 1 And a regeneration vehicle shell.
The water acid tank comprises a cylinder, an upper cover, a concentration ratio indicating plate, an outlet and a support.
The ion exchange resin column comprises a column body, a resin funnel and a valve F 3 ～F 6 Funnel valve F 11 Resin discharging valve F 12 A liquid inlet, a resin outlet and a backwashing port.
The acid-proof pump comprises a regulating valve F 1 Check valve F 2 Motor, pump body, inlet, liquid outlet, pump switch.
The flowmeter comprises a transparent shell, a flow floater, a flow indicating scale mark, a liquid inlet and a liquid outlet.
The intelligent conductivity meter comprises an electrode cup, a conductive electrode, a program control unit, a measurement display unit and an electric valve F 9 。
The external ion resin column comprises a lower tray, an upper lantern ring, a column body and a liquid inlet electric valve F 7 Electric valve F for discharging liquid 13 。
The shell of the regeneration vehicle comprises a power switch, a perspective window, a handle and a movable wheel.
Each valve F 3 ～F 14 The intelligent conductivity meter is provided with a program control unit for executing the switching program to each valve according to the time setting of the regeneration operation sequence.
The valve F 1 The flow float position can be adjusted manually. F 11 Is an electric valve of an ion resin funnel. F 12 An electrically operated valve was vented for the ionic resin.
The working process of the invention is as follows:
1. and starting a power switch, clicking an 'initialization' character frame in a touch screen of the intelligent conductivity meter 5, and resetting each valve. Then 36% HCL liquid is injected into the lower mark of the lower label scale of the resin column, and then the demineralized water is injected into the upper mark line of the upper label scale.
2. Click "note resin" word frame in intelligent conductivity meter touch screen, valve F 11 And opening. Then the ion resin to be regenerated is injected into the ion resin column through a funnel.
3. And starting a power switch of the acid-proof pump.
4. Regulating valve F 1 The float of the flowmeter reaches the required scale of 60-90L/h.
5. Clicking a 'regeneration' character frame in the touch screen of the intelligent conductivity meter, starting countdown by the program control unit, and respectively opening or closing the corresponding valves according to the countdown nodes.
6. And after the countdown is finished, the regeneration is finished, the valve is reset, and the power supply of the pump is turned off.
7. And injecting desalted water into the water acid tank until the upper marked line of the signboard is reached.
8. The pump power switch is turned on. And clicking a backwashing character frame in the touch screen of the intelligent conductivity meter.
9. The program control unit starts to count time of 'backwashing', and corresponding valves are respectively opened or closed according to the node of the countdown.
10. When the 'backwashing' count down is finished, the 'backwashing' is finished, each valve is reset, and the power supply of the pump is closed.
11. Injecting proper amount of demineralized water into the hydrochloric acid tank, clicking a resin discharging frame in the touch screen of the intelligent conductivity meter, and discharging a resin valve F 12 And opening.
12. And starting a pump power supply, discharging resin, counting down, and respectively opening or closing corresponding valves according to each node in the counting down.
13. And when the resin is discharged after the resin countdown is finished, resetting each valve.
The total power is turned off.
Programming instructions for each valve according to a timed sequence:
"initialize": all valves are closed.
B. 'resin injection': f 11 System diagram on display screenMiddle F 11 Flashing, and other valves are closed.
C. in "regeneration" F 1 -F 2 -a flow meter-F 4 -F 14 Exchange column-F 5 -F 8 -F 10 Simultaneously, the valve is opened and flickers in a system diagram of a display screen, and other valves are closed. D. during "backwashing 1 -F 2 - -flowmeter-F 3 -F 14 Exchange column-F 6 -F 8 -F 10 Simultaneously, the valve is opened and flickers in a system diagram of a display screen, and other valves are closed. E. resin line F 1 -F 2 -a flow meter-F 3 -exchange column-F 12 Simultaneously, the valve is opened and flickers in a system diagram of a display screen, and other valves are closed.
F. External single column regeneration time F 1 -F 2 -a flow meter-F 4 -F 6 -F 7 -F 13 -F 10 Simultaneously, the valves are opened and flash in the system diagram of the display screen, and the rest valves are closed.
G. External single column 'backwash' time F 1 -F 2 -a flow meter-F 4 -F 6 -F 7 -F 13 -F 10 Simultaneously, the valve is opened and flickers in a system diagram of a display screen, and other valves are closed.
"electrical conductivity measurement": during the "backwash" procedure, F when running to time t 9 Opening and flashing, F 10 Turn off and measure conductivity values.
All valves are corrosion resistant.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the invention, "plurality" means two or more unless explicitly specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (4)
1. The utility model provides a portable ion exchange resin regeneration car, includes water acid tank (1) and casing (10), its characterized in that: install acid-resistant pump (2) on water sour case (1), install hand valve (3) between acid-resistant pump (2) and the water sour case (1), acid-resistant pump (2) are through tube coupling check valve (4), check valve (4) are through tube coupling flowmeter (5), ion exchange column (6), intelligent conductivity meter (7) and external regeneration post (8), be equipped with electric valve (9) on the pipeline, casing (10) middle part is equipped with handle (11), the bottom is equipped with removal wheel (12), casing (10) side is equipped with perspective window (13), one side of keeping away from handle (11) is equipped with control panel (14).
2. The mobile ion exchange resin regeneration vehicle of claim 1, wherein: the bottom of the hydrochloric acid tank (1) is provided with an outlet (1.1), the periphery of the outlet (1.1) is provided with a support (1.2), the top of the hydrochloric acid tank (1) is provided with an upper cover (1.3), and the hydrochloric acid tank (1) is provided with a concentration ratio indicator (1.4).
3. The mobile ion exchange resin regeneration vehicle of claim 1, wherein: the top of the ion exchange column (6) is provided with a backwashing port (6.1), the bottom of the ion exchange column is provided with a liquid inlet (6.2), the outer side of the top of the ion exchange column (6) is provided with a resin funnel (6.3), and the outer side of the bottom of the ion exchange column is provided with a resin outlet (6.4).
4. The mobile ion exchange resin regeneration vehicle of claim 1, wherein: an upper lantern ring (8.1) is arranged on the outer side of the external regeneration column (8), and a lower tray (8.2) is arranged at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210902420.3A CN115106133A (en) | 2022-07-29 | 2022-07-29 | Movable ion exchange resin regeneration vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210902420.3A CN115106133A (en) | 2022-07-29 | 2022-07-29 | Movable ion exchange resin regeneration vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115106133A true CN115106133A (en) | 2022-09-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210902420.3A Pending CN115106133A (en) | 2022-07-29 | 2022-07-29 | Movable ion exchange resin regeneration vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115106133A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08309347A (en) * | 1995-05-16 | 1996-11-26 | Japan Organo Co Ltd | Mobile water purifying apparatus |
| CN202290064U (en) * | 2011-09-30 | 2012-07-04 | 深圳市水苑水工业技术设备有限公司 | Device for regenerating special resin for instrument |
| CN204079547U (en) * | 2014-05-26 | 2015-01-07 | 周会光 | Semi-automatic water softening device |
| CN204911543U (en) * | 2015-08-17 | 2015-12-30 | 南京华天科技发展股份有限公司 | Hydrogen cation exchange resin's for conductivity measurement regenerating unit |
| CN206553211U (en) * | 2017-01-20 | 2017-10-13 | 广东净源纯水设备有限公司 | A kind of water process water tank |
| CN208574646U (en) * | 2018-06-14 | 2019-03-05 | 南京益能环境工程有限公司 | Mobile resin regeneration all-in-one machine |
| CN216573132U (en) * | 2021-08-19 | 2022-05-24 | 华电电力科学研究院有限公司 | Dynamic regenerating device for ion exchange resin |
| CN216704409U (en) * | 2021-12-22 | 2022-06-10 | 江苏苏青水处理工程集团有限公司 | Acid-base system for ion exchange resin regeneration |
| CN217747112U (en) * | 2022-07-29 | 2022-11-08 | 大连华城电子有限公司 | Mobile ion exchange resin regeneration vehicle |
-
2022
- 2022-07-29 CN CN202210902420.3A patent/CN115106133A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08309347A (en) * | 1995-05-16 | 1996-11-26 | Japan Organo Co Ltd | Mobile water purifying apparatus |
| CN202290064U (en) * | 2011-09-30 | 2012-07-04 | 深圳市水苑水工业技术设备有限公司 | Device for regenerating special resin for instrument |
| CN204079547U (en) * | 2014-05-26 | 2015-01-07 | 周会光 | Semi-automatic water softening device |
| CN204911543U (en) * | 2015-08-17 | 2015-12-30 | 南京华天科技发展股份有限公司 | Hydrogen cation exchange resin's for conductivity measurement regenerating unit |
| CN206553211U (en) * | 2017-01-20 | 2017-10-13 | 广东净源纯水设备有限公司 | A kind of water process water tank |
| CN208574646U (en) * | 2018-06-14 | 2019-03-05 | 南京益能环境工程有限公司 | Mobile resin regeneration all-in-one machine |
| CN216573132U (en) * | 2021-08-19 | 2022-05-24 | 华电电力科学研究院有限公司 | Dynamic regenerating device for ion exchange resin |
| CN216704409U (en) * | 2021-12-22 | 2022-06-10 | 江苏苏青水处理工程集团有限公司 | Acid-base system for ion exchange resin regeneration |
| CN217747112U (en) * | 2022-07-29 | 2022-11-08 | 大连华城电子有限公司 | Mobile ion exchange resin regeneration vehicle |
Non-Patent Citations (1)
| Title |
|---|
| 吴泾热电厂: "100吨/时移动式混合床除盐水处理设备运行小结", 《电力技术通讯》, 1 April 1974 (1974-04-01), pages 38 - 62 * |
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