CN112546785A - System and method for purifying metal smelting flue gas - Google Patents
System and method for purifying metal smelting flue gas Download PDFInfo
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- CN112546785A CN112546785A CN202011268865.8A CN202011268865A CN112546785A CN 112546785 A CN112546785 A CN 112546785A CN 202011268865 A CN202011268865 A CN 202011268865A CN 112546785 A CN112546785 A CN 112546785A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 239000003546 flue gas Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003723 Smelting Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 title claims abstract description 16
- 239000000779 smoke Substances 0.000 claims abstract description 46
- 238000005406 washing Methods 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims description 35
- 239000000428 dust Substances 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 20
- 239000003517 fume Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000002378 acidificating effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005201 scrubbing Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a system and a method for purifying metal smelting flue gas, wherein the system comprises a washing tower and a condenser, the condenser comprises a first cooler and a second cooler, the first cooler is arranged at the front end of the washing tower, and the second cooler is arranged at the rear end of the washing tower; the first cooler is a dividing wall type heat exchanger or a heat accumulating type heat exchanger; the second cooler is a heat pipe heat exchanger. The system may be used to implement a corresponding method. By adopting the system and the method provided by the scheme, the process is optimized, so that the formation of dewing smoke at the smoke outlet can be effectively avoided, and the characteristic of improving the smoke treatment efficiency is achieved.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a system and a method for purifying metal smelting flue gas.
Background
SO2、NOxAnd dust is a main pollutant released in the metal smelting process, which causes serious harm to the atmospheric environment, and in other industries, dust is also an important treatment object in tail gas treatment, and China also sets increasingly strict emission standards for the dust.
Based on this, the prior art has more types of equipment, systems and methods for metal smelting flue gas treatment. In many smoke and dust purification systems, one or more of cloth bag dust removal, cyclone dust removal, spray humidification gravity dust removal and electrostatic dust removal are adopted to be connected in series, so that the purposes of purifying smoke and dust and meeting the emission requirement are achieved.
Further optimizing the flue gas treatment technology undoubtedly has important significance to the society.
Disclosure of Invention
Aiming at the problem that the further optimization of the flue gas treatment technology is undoubtedly significant to the society, the invention provides the system and the method for purifying the metal smelting flue gas.
The invention provides a system and a method for purifying metal smelting flue gas, which solve the problems through the following technical key points, wherein the system for purifying the metal smelting flue gas comprises a washing tower and a condenser, wherein the condenser comprises a first cooler and a second cooler, the first cooler is arranged at the front end of the washing tower, and the second cooler is arranged at the rear end of the washing tower; the first cooler is a dividing wall type heat exchanger or a heat accumulating type heat exchanger; the second cooler is a heat pipe heat exchanger.
In the prior art, wet washing is mostly adopted when flue gas containing smoke dust and acidic gas containing sulfide is treated, the smoke dust and the acidic gas can be effectively removed after the wet washing, and meanwhile, the treatment method also has the characteristics of low equipment setting cost, low equipment operation cost and capability of being used for cooling. In the finishing treatment process, a heat exchanger is also adopted, but the prior application is generally used for recovering heat, and although the heat exchanger has a remarkable cooling effect on the temperature of the flue gas, the heat exchanger is not generally used for controlling the temperature of the flue gas. Because the temperature of the flue gas discharged by metal smelting is generally higher, the following results are obtained: in cold seasons, the smoke outlet has obvious smoke due to the condensation of water vapor.
Aiming at the problems, the technical scheme is provided, wherein the smoke treatment efficiency is considered, and the dew forming smoke (smoke plume) at the smoke outlet is considered.
In the specific technical scheme, the washing tower is used for carrying out wet washing on the flue gas so as to solve the problems of acidic oxides and smoke dust in the flue gas. The first cooler and the second cooler are both used for cooling flue gas, and are different from the prior art in that: the first cooler is arranged at the front end of the washing tower, the second cooler is arranged at the rear end of the washing tower, and meanwhile, the problem of smoke dust and harmful gas dissipation during the work of the first cooler is avoided by limiting the form of the coolers; at the same time as distinguished from, for example, the arrangement of the first cooler also on the basis of wet cooling, a further increase in the moisture content of the flue gas during operation of the first cooler is avoided. In the further flow, the flue gas discharged by the first cooler enters the washing tower, because the preliminary cooling to the flue gas has been accomplished in the first cooler, so in the washing tower, because the washing water evaporation capacity of flue gas temperature flue gas can be showing less, make the flue gas that enters into the second cooler by the washing tower water content is less, make the water that needs to be handled in the later stage flue gas less, the accessible reduces heat transfer thermal resistance in the second cooler simultaneously, improve the heat transfer environment of second cooler, promote the heat transfer capacity of second cooler. In the further flow, through with the second cooler sets for the heat pipe heat exchanger, the phase transition that takes place in not only usable heat pipe heat exchanger conducts heat and promotes the cooling capacity of second cooler to the flue gas, considers the control of exhaust gas temperature simultaneously, in further cooling, when the temperature of flue gas is close with the room temperature, provides one kind and need not purpose-made cold source (with the air as the cold source can), can solve traditional heat exchanger because the not good problem of cooling effect that the heat conduction drive power is showing to descend and arouse.
To sum up, this scheme is simple structure not only, is implementing simultaneously under the lower condition of cooling process cost, can effectively reduce the temperature of flue gas to the ambient temperature of exhaust port to reach the problem of avoiding the exhaust port to form dewfall smog. By adopting the scheme, the application of the first cooler can effectively improve the overall flue gas treatment efficiency of the system.
The further technical scheme is as follows:
more completely, in the working process of the second cooler, because liquid drops are inevitably separated out from the flue gas, the setting is as follows: and the demisting device is arranged at the rear end of the second cooler. The defogging device is used for capturing and removing the liquid drops.
As a specific implementation scheme of the defogging device, the defogging device is set as follows: the defogging device comprises a cyclone defogger and an electric dust collector, the cyclone defogger is arranged at the front end of the electric dust collector, and the inlet end of the cyclone defogger is connected with the outlet end of the second cooler. In the scheme, the primary demisting is carried out on the flue gas cooled by the second cooler by utilizing the characteristic of high demisting efficiency of the cyclone demister so as to greatly reduce the demisting load of the electric dust remover; and then, the electric dust remover is used for post-stage demisting, so that the remaining smaller smoke dust and liquid drops can be effectively removed, and the white elimination of the smoke outlet is realized.
More complete, for better collection pending flue gas, as the flue gas input of this system, set up to: the first cooler is connected with the first cooling device through a first cooling pipe. In particular application, in order to enable the fume collecting hood to cover a larger fume collecting area range, the fume collecting hood is arranged in a bell mouth shape with the size of the inlet end larger than that of the outlet end.
Consider that first cooler work is in the front end of scrubbing tower, and its heat transfer face is covered by the smoke and dust easily and leads to the heat transfer ability to descend, for making this system can last high-efficient operation, sets up to: the number of the first coolers is multiple, and at least two first coolers are connected in the system in parallel. In specific application, the first coolers connected in parallel can be switched to use.
For the content that reduces the water in the second cooler flue gas of getting into by the scrubbing tower to reduce the work load of second cooler and promote its heat transfer ability, set up as: still including setting up the catch water between scrubbing tower and second cooler. The steam-water separator is used for realizing the current flue gas temperature, and a drain valve, a cyclone demister and the like connected to a pipeline can be adopted for specific use because of the water body carried by the flue gas flowing. Preferably, the form of the storage tank matched with the drain valve is adopted: the removable water in the part of the flue gas comes from a washing tower, and the storage tank can be used as a buffer tank and realizes steam-water separation by utilizing gravity sedimentation in the process of accommodating the flue gas; meanwhile, the flow control of the flue gas entering the second cooler is convenient to realize, so that the second cooler works under the optimal working condition.
More complete, not only can provide enough power for this system of flue gas stream passing through as one kind, can avoid the power supply itself not receive harmful gas, smoke and dust, the technical scheme of temperature influence simultaneously, set up to: a fan is also connected in series in the system and is positioned at the rear end of the second cooler.
To match the efficiency of the system, the following settings are made: the dividing wall type heat exchanger is a spray type heat exchanger. The first cooler is selected to have enough heat exchange capacity to match the primary temperature reduction of the high-flow flue gas.
The scheme also discloses a method for purifying the metal smelting flue gas, which comprises the following steps in sequence:
s1, performing primary cooling on the flue gas, wherein in the primary cooling process, a cold source is isolated from the flue gas;
s2, washing the flue gas after primary cooling;
and S3, cooling the washed flue gas to the ambient temperature of the smoke outlet by adopting a heat pipe exchanger.
As mentioned above, by adopting the method, under the condition of low cost in the implementation of the cooling process, the temperature of the flue gas can be effectively reduced to the environmental temperature of the smoke outlet, so that the problem of forming dewed smoke at the smoke outlet is solved; this scheme of adoption can effectively promote the holistic flue gas treatment effeciency of system.
As a further technical scheme of the method:
more completely, the setting is as follows: further comprising a step S4, wherein the step S4 is: and a demisting device is adopted to demist the flue gas cooled by the heat pipe heat exchanger.
The invention has the following beneficial effects:
as described above, by adopting the system and the method provided by the scheme, under the condition of low cost in the implementation of the cooling process, the temperature of the flue gas can be effectively reduced to the environmental temperature of the smoke outlet, so that the problem of forming dewed smoke at the smoke outlet is solved; this scheme of adoption can effectively promote the holistic flue gas treatment effeciency of system.
Drawings
FIG. 1 is a schematic structural diagram of a system and a method for purifying metallurgical off-gas according to an embodiment of the present invention.
The reference numbers in the figures are in order: 1. the device comprises a first cooler, 2, a washing tower, 3, a second cooler, 4, a cyclone demister, 5, an electric dust remover, 6, a fan, 7 and a smoke collecting hood.
Detailed Description
The present invention will be described in further detail with reference to examples, but the structure of the present invention is not limited to the following examples.
Example 1:
as shown in fig. 1, a system for purifying metallurgical off-gas comprises a washing tower 2 and a condenser, wherein the condenser comprises a first cooler 1 and a second cooler 3, the first cooler 1 is arranged at the front end of the washing tower 2, and the second cooler 3 is arranged at the rear end of the washing tower 2; the first cooler 1 is a dividing wall type heat exchanger or a heat accumulating type heat exchanger; the second cooler 3 is a heat pipe heat exchanger.
In the prior art, wet washing is mostly adopted when flue gas containing smoke dust and acidic gas containing sulfide is treated, the smoke dust and the acidic gas can be effectively removed after the wet washing, and meanwhile, the treatment method also has the characteristics of low equipment setting cost, low equipment operation cost and capability of being used for cooling. In the finishing treatment process, a heat exchanger is also adopted, but the prior application is generally used for recovering heat, and although the heat exchanger has a remarkable cooling effect on the temperature of the flue gas, the heat exchanger is not generally used for controlling the temperature of the flue gas. Because the temperature of the flue gas discharged by metal smelting is generally higher, the following results are obtained: in cold seasons, the smoke outlet has obvious smoke due to the condensation of water vapor.
Aiming at the problems, the technical scheme is provided, wherein the smoke treatment efficiency is considered, and the dew forming smoke (smoke plume) at the smoke outlet is considered.
In the specific technical scheme, the washing tower 2 is used for washing the flue gas by a wet method so as to solve the problems of acidic oxides and smoke dust in the flue gas. The first cooler 1 and the second cooler 3 are both used for cooling flue gas, and are different from the prior art in that: the first cooler 1 is arranged at the front end of the washing tower 2, the second cooler 3 is arranged at the rear end of the washing tower 2, and meanwhile, the problem of smoke dust and harmful gas dissipation during the work of the first cooler 1 is avoided by limiting the form of the coolers; at the same time as distinguished from, for example, the arrangement of the first cooler 1 also on the basis of wet cooling, a further increase in the moisture content of the flue gas during operation of the first cooler 1 is avoided. In the further flow, the flue gas discharged from the first cooler 1 enters the washing tower 2, and the primary cooling of the flue gas is completed in the first cooler 1, so that in the washing tower 2, because the evaporation capacity of the washing water of the flue gas at the temperature of the flue gas can be obviously less, the water content in the flue gas entering the second cooler 3 from the washing tower 2 is less, the water to be treated in the flue gas at the later stage is less, and meanwhile, the heat transfer resistance in the second cooler 3 can be reduced, so that the heat exchange environment of the second cooler 3 is improved, and the heat exchange capacity of the second cooler 3 is improved. In the further flow, through with second cooler 3 sets for heat pipe exchanger, not only can utilize the phase transition heat transfer that takes place in the heat pipe exchanger to promote the cooling capacity of second cooler 3 to the flue gas, considers the control of exhaust gas temperature simultaneously, in further cooling, when the temperature of flue gas is close with the room temperature, provides one kind and need not purpose-made cold source (with the air as the cold source can), can solve traditional heat exchanger because the not good problem of cooling effect that the heat conduction drive power is showing to descend and arouse.
To sum up, this scheme is simple structure not only, is implementing simultaneously under the lower condition of cooling process cost, can effectively reduce the temperature of flue gas to the ambient temperature of exhaust port to reach the problem of avoiding the exhaust port to form dewfall smog. This scheme of adoption, the holistic flue gas treatment efficiency of system can effectively be promoted in the application of above first cooler 1.
Example 2:
this example is further defined on the basis of example 1: as shown in fig. 1, more completely, during the operation of the second cooler 3, because of the inevitable separation of liquid droplets from the flue gas, the arrangement is: and a demister arranged at the rear end of the second cooler 3. The defogging device is used for capturing and removing the liquid drops.
As a specific implementation scheme of the defogging device, the defogging device is set as follows: the defogging device includes cyclone mist eliminator 4 and electrostatic precipitator 5, cyclone mist eliminator 4 sets up the front end at electrostatic precipitator 5, cyclone mist eliminator 4's entry end meets with the exit end of second cooler 3. In the scheme, the primary demisting is carried out on the flue gas cooled by the second cooler 3 by utilizing the characteristic of high demisting efficiency of the cyclone demister 4, so that the demisting load of the electric dust remover 5 is greatly reduced; and then, the electric dust collector 5 is used for post-stage demisting, so that the remaining smaller smoke dust and liquid drops can be effectively removed, and the whitening of the smoke outlet is realized.
More complete, for better collection pending flue gas, as the flue gas input of this system, set up to: and a fume collecting hood 7 connected to the front end of the first cooler 1. In particular, in order to enable the fume collecting hood 7 to cover a larger range of a fume collecting area, the fume collecting hood 7 is formed in a bell mouth shape in which the size of the inlet end is larger than that of the outlet end.
Considering that first cooler 1 works at the front end of scrubbing tower 2, its heat transfer face is covered by the smoke and dust easily and leads to the heat transfer ability to descend, for making this system can last high-efficient operation, sets up to: the number of the first coolers 1 is plural, and at least two first coolers 1 are connected in the system in parallel. In specific application, the first coolers 1 connected in parallel can be switched to use.
For reducing the content of the water body in the flue gas entering the second cooler 3 from the washing tower 2, so as to reduce the work load of the second cooler 3 and improve the heat exchange capacity thereof, the method is set as follows: and the device also comprises a steam-water separator arranged between the washing tower 2 and the second cooler 3. The steam-water separator is used for realizing the current flue gas temperature, and a drain valve, a cyclone demister 4 and the like connected to a pipeline can be adopted for specific use because of the water body carried by the flue gas flowing. Preferably, the form of the storage tank matched with the drain valve is adopted: the removable water in the part of the flue gas comes from the washing tower 2, the storage tank can be used as a buffer tank, and the steam-water separation is realized by utilizing gravity sedimentation in the process of containing the flue gas; and simultaneously, the flow control of the flue gas entering the second cooler 3 is convenient to realize, so that the second cooler 3 works under the optimal working condition.
More complete, not only can provide enough power for this system of flue gas stream passing through as one kind, can avoid the power supply itself not receive harmful gas, smoke and dust, the technical scheme of temperature influence simultaneously, set up to: the system is also connected with a fan 6 in series, and the fan 6 is positioned at the rear end of the second cooler 3.
To match the efficiency of the system, the following settings are made: the dividing wall type heat exchanger is a spray type heat exchanger. The first cooler 1 is of a type selected so that the first cooler 1 has sufficient heat exchange capacity to match the primary temperature reduction of the high flow rate flue gas.
Example 3:
the embodiment provides a method for purifying metal smelting flue gas, which comprises the following steps in sequence:
s1, performing primary cooling on the flue gas, wherein in the primary cooling process, a cold source is isolated from the flue gas;
s2, washing the flue gas after primary cooling;
and S3, cooling the washed flue gas to the ambient temperature of the smoke outlet by adopting a heat pipe exchanger.
As mentioned above, by adopting the method, under the condition of low cost in the implementation of the cooling process, the temperature of the flue gas can be effectively reduced to the environmental temperature of the smoke outlet, so that the problem of forming dewed smoke at the smoke outlet is solved; this scheme of adoption can effectively promote the holistic flue gas treatment effeciency of system.
More completely, the setting is as follows: further comprising a step S4, wherein the step S4 is: and a demisting device is adopted to demist the flue gas cooled by the heat pipe heat exchanger.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. For those skilled in the art to which the invention pertains, other embodiments that do not depart from the gist of the invention are intended to be within the scope of the invention.
Claims (10)
1. A system for purifying metal smelting flue gas comprises a washing tower (2) and a condenser, and is characterized in that the condenser comprises a first cooler (1) and a second cooler (3), wherein the first cooler (1) is arranged at the front end of the washing tower (2), and the second cooler (3) is arranged at the rear end of the washing tower (2); the first cooler (1) is a dividing wall type heat exchanger or a heat accumulating type heat exchanger; the second cooler (3) is a heat pipe heat exchanger.
2. A system for metallurgical off-gas cleaning according to claim 1, further comprising a demister located at the rear end of the second cooler (3).
3. The system for purifying metal smelting flue gas according to claim 2, wherein the demisting device comprises a cyclone demister (4) and an electric dust remover (5), the cyclone demister (4) is arranged at the front end of the electric dust remover (5), and the inlet end of the cyclone demister (4) is connected with the outlet end of the second cooler (3).
4. A system for metallurgical off-gas cleaning according to claim 1, further comprising a fume collecting hood (7) connected to the front end of the first cooler (1).
5. A system for purification of metallurgical off-gas according to claim 1, characterized in that the number of first coolers (1) is multiple and that at least two first coolers (1) are connected in parallel in the system.
6. The system for purifying the metallurgical off-gas according to claim 1, further comprising a steam-water separator arranged between the washing tower (2) and the second cooler (3).
7. A system for purification of metallurgical off-gas according to claim 1, characterized in that a fan (6) is also connected in series in the system, said fan (6) being located at the rear end of the second cooler (3).
8. The system for purifying metallurgical off-gas of claim 1, wherein the dividing wall heat exchanger is a spray heat exchanger.
9. A method for purifying metal smelting flue gas is characterized by comprising the following steps which are carried out in sequence:
s1, performing primary cooling on the flue gas, wherein in the primary cooling process, a cold source is isolated from the flue gas;
s2, washing the flue gas after primary cooling;
and S3, cooling the washed flue gas to the ambient temperature of the smoke outlet by adopting a heat pipe exchanger.
10. The method for metallurgical off-gas cleaning of claim 9, further comprising step S4, wherein step S4 is: and a demisting device is adopted to demist the flue gas cooled by the heat pipe heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011268865.8A CN112546785A (en) | 2020-11-13 | 2020-11-13 | System and method for purifying metal smelting flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011268865.8A CN112546785A (en) | 2020-11-13 | 2020-11-13 | System and method for purifying metal smelting flue gas |
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| CN202011268865.8A Pending CN112546785A (en) | 2020-11-13 | 2020-11-13 | System and method for purifying metal smelting flue gas |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201014841D0 (en) * | 2009-09-16 | 2010-10-20 | Bha Group Inc | Power plant emissions control using integrated organic rankine cycle |
| CN204756938U (en) * | 2015-05-01 | 2015-11-11 | 王增日 | Novel chemical industry system of trash disposal |
| CN204873842U (en) * | 2015-07-09 | 2015-12-16 | 刘章孝 | Tail gas processing apparatus of phosphorous sludge burning relieving haperacidity technology |
| CN110075698A (en) * | 2019-04-22 | 2019-08-02 | 山西华仁通电力科技有限公司 | The flue gas advanced purification system and its method that energy-saving plume is eliminated |
-
2020
- 2020-11-13 CN CN202011268865.8A patent/CN112546785A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201014841D0 (en) * | 2009-09-16 | 2010-10-20 | Bha Group Inc | Power plant emissions control using integrated organic rankine cycle |
| CN204756938U (en) * | 2015-05-01 | 2015-11-11 | 王增日 | Novel chemical industry system of trash disposal |
| CN204873842U (en) * | 2015-07-09 | 2015-12-16 | 刘章孝 | Tail gas processing apparatus of phosphorous sludge burning relieving haperacidity technology |
| CN110075698A (en) * | 2019-04-22 | 2019-08-02 | 山西华仁通电力科技有限公司 | The flue gas advanced purification system and its method that energy-saving plume is eliminated |
Non-Patent Citations (1)
| Title |
|---|
| 黄素逸 等, 华中科技大学出版社 * |
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