CN112206614A - Waste gas treatment method and waste gas treatment device - Google Patents
Waste gas treatment method and waste gas treatment device Download PDFInfo
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- CN112206614A CN112206614A CN202011097923.5A CN202011097923A CN112206614A CN 112206614 A CN112206614 A CN 112206614A CN 202011097923 A CN202011097923 A CN 202011097923A CN 112206614 A CN112206614 A CN 112206614A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/421—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path
- B01F25/422—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path between stacked plates, e.g. grooved or perforated plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a waste gas treatment method and a waste gas treatment device, comprising the following steps of respectively introducing waste gas and water mist into a mixing chamber, mixing and agglomerating the waste gas and the water mist in the mixing chamber, adsorbing the water mist by pollutant particles in the waste gas, and separating and purifying the waste gas while forming pollutant particle clusters; after mixing and agglomeration in the mixing chamber, pollutant particle groups containing water are continuously deposited in the mixing chamber and overflow out of the mixing chamber, and the separated and purified waste gas is discharged out of the mixing chamber. Although the method is simple and low in cost, the waste gas and the fine water mist are fully mixed and agglomerated conveniently and effectively, and pollutants in the waste gas adsorb the water mist to form larger pollutant particle groups. The treated harmful substances are convenient to recycle, and the technical problems that the investment cost is high, the procedure is complex, the treated harmful substances cannot be recycled and the subsequent treatment and management are needed to be performed with great effort in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a waste gas treatment method and a waste gas treatment device.
Background
With the continuous development of economy and science and technology in China, the emission of waste gas generated in the industrial production and living process is increasingly serious. Exhaust gas discharged in production and life is difficult to be well treated and purified due to complex components. At present, common waste gas treatment methods are generally divided into two types, wherein the first type is mainly used for purifying waste gas containing dust particles, inorganic chemical components or heavy metal components or organic waste gas containing water-soluble components by adopting the modes of filtration, spray washing, electrostatic adhesion settling and the like; and the second type adopts an activated carbon adsorption mode to adsorb most of organic waste gas insoluble in water, and the adsorbed activated carbon is subjected to high-temperature combustion or high-temperature catalytic decomposition to decompose harmful gas into harmless carbon dioxide, water and the like.
However, most of the existing waste gas treatment methods, the first type of waste gas treatment methods is low in concentration of pollutants in waste water after dust, inorganic chemical component waste gas and water-soluble organic waste gas are treated by spraying and washing, has no utilization value, and needs to perform chemical neutralization, microbial degradation and deposition according to the waste water treatment process, and then the waste water is filtered, filter-pressed and dewatered to become solid waste for subsequent treatment. In the two types of waste gas treatment processes, high consumable cost including water, chemicals, activated carbon and the like is required, and the treated harmful substances cannot be recycled, and great energy is required for subsequent treatment and management.
Disclosure of Invention
One of the objects of the present invention is to provide a method for treating exhaust gas, which solves the above-mentioned technical problems of high investment cost, complicated procedure, failure to recycle the harmful substances after treatment, and the need to invest great efforts in subsequent treatment and management.
The technical scheme for realizing one purpose of the invention is as follows: a waste gas treatment method comprises the following steps of respectively introducing waste gas and water mist into a mixing chamber, mixing and agglomerating the waste gas and the water mist in the mixing chamber, adsorbing the water mist by pollutant particles in the waste gas, forming pollutant particle clusters, and simultaneously separating and purifying the waste gas; after mixing and agglomeration are carried out in the mixing chamber, pollutant particle groups containing water are continuously deposited in the mixing chamber and overflow out of the mixing chamber, and the separated and purified waste gas is discharged out of the mixing chamber.
Further, the waste gas and the water mist are stirred and mixed in the mixing chamber, and the water mist is made into fine particles by an ultrasonic method.
Further, a stirring device is arranged in the mixing chamber, and the stirring device is designed as a rotating centrifugal impeller.
Further, the separated and purified exhaust gas is discharged from the mixing chamber from above the mixing chamber.
Furthermore, the upper part of the mixing chamber is communicated with a second chamber for collecting pollutant particle clusters, the flow area of a first connecting channel between the mixing chamber and the second chamber is smaller than the cross sectional area of the second chamber, the flow area of the first connecting channel is smaller than the cross sectional area of the mixing chamber, and the pollutant particle clusters containing moisture are continuously deposited in the mixing chamber, upwards overflow into the second chamber and flow out of the second chamber.
And further, a pollutant particle group discharge pipeline is arranged at the bottom of the second chamber, a guide plate is obliquely arranged in the second chamber and above the position close to the pollutant particle group discharge pipeline, and pollutant particle groups flow into the pollutant particle group discharge pipeline along the guide plate and are discharged outwards.
The beneficial effects of realizing one of the purposes of the invention are as follows: the invention provides a waste gas treatment method, which is simple and low in cost, but is very convenient and effective, industrial waste gas or domestic waste gas, whether organic waste gas or inorganic waste gas, is sent into a mixing chamber through a pipeline, and is also sent into the mixing chamber through water mist, the waste gas and the fine water mist are fully mixed and agglomerated, pollutants in the waste gas adsorb the water mist, and larger pollutant particle groups are formed. Similar to the formation principle of raindrops in the atmosphere, the method has the advantages of low input cost and simple procedure, and the treated harmful substances are convenient to recycle, so that the technical problems that the input cost is high, the procedure is complex, and the treated harmful substances cannot be recycled and need great energy for subsequent treatment and management in the prior art are solved.
The second object of the present invention is to provide an exhaust gas treatment device.
The second technical scheme for realizing the purpose of the invention is as follows: the utility model provides an exhaust treatment device, exhaust treatment device includes mixing chamber, mixing chamber is equipped with waste gas import and water smoke import, mixing chamber's upper portion is equipped with pollutant particle group discharge port and purifies gas discharge port respectively.
Further, the water mist inlet is arranged below the waste gas inlet.
Further, the exhaust gas treatment device also comprises an ultrasonic atomizer communicated with the water mist inlet, wherein the ultrasonic atomizer is used for manufacturing fine water mist.
Further, a stirring device is arranged in the mixing chamber, and the stirring device is a rotary centrifugal impeller.
Furthermore, the upper portion of the mixing chamber is communicated with a second chamber for collecting pollutant particle clusters, the rotating centrifugal impeller is located in the second chamber, the flow area of a first connecting channel located between the mixing chamber and the second chamber is smaller than the cross sectional area of the second chamber, the flow area of the first connecting channel is smaller than the cross sectional area of the mixing chamber, and the pollutant particle clusters containing moisture are continuously deposited in the mixing chamber, upwards overflow into the second chamber and flow out of the second chamber.
Further, a pollutant particle group discharge pipeline is arranged at the bottom of the second chamber.
Furthermore, a guide plate is obliquely arranged above the pollutant particle cluster discharge pipeline in the second cavity.
Further, exhaust treatment device still includes the purge gas discharge pipe who sets up in mixing chamber top, purge gas discharge pipe is the shape of pitch arc bending, purge gas discharge pipe's export direction is the level form.
Furthermore, the included angle between the guide plate and the horizontal plane is 30-45 degrees.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic view of an operating principle of an exhaust gas treatment device according to embodiment 1 of the present invention;
fig. 2 is a schematic flow chart of an exhaust gas treatment method according to embodiment 2 of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
100. an exhaust gas treatment device; 10. a mixing chamber; 11. an exhaust gas inlet; 12. a water mist inlet; 13. a pollutant particle cluster discharge pipeline; 20. rotating the centrifugal impeller; 30. a purge gas discharge conduit; 40. a second chamber; 41. a baffle; 50. a first connecting channel; 200. an exhaust gas; 300. and (4) water mist.
Detailed Description
The principles and features of the present invention are described below in conjunction with the accompanying fig. 1-2, which are provided as examples to illustrate the invention and not to limit the scope of the invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
As shown in fig. 1, the present invention provides an exhaust gas treatment device, wherein the exhaust gas treatment device 100 includes a mixing chamber 10, the mixing chamber 10 is provided with an exhaust gas inlet 11 and a water mist inlet 12, and an upper portion of the mixing chamber 10 is provided with a pollutant particle group discharge port and a purified gas discharge port, respectively.
The above-described embodiment has the following advantages:
1. the device is used for waste gas treatment, industrial waste gas or domestic waste gas, organic waste gas or inorganic waste gas, waste gas and fine water mist are fully mixed and agglomerated through the waste gas inlet 11 and the water mist inlet 12 which are arranged on the mixing chamber 10, pollutants in the waste gas adsorb the water mist to form larger pollutant particle clusters, and the pollutant particle clusters are similar to the formation principle of raindrops in the atmosphere, but the device is very convenient and effective though the device has simple structure and low cost;
2. through the upper portion at mixing chamber 10 be equipped with pollutant granule group discharge port and purge gas discharge port respectively, because pollutant granule group is the mixture by high concentration pollutant and water and constitutes and consequently be the solution state, pollutant granule group deposit rises to mixing chamber 10's upper portion, along with the action of gravity, assemble outflow pollutant granule group discharge port from mixing chamber 10 upper wall, gas through separation purification is discharged from purge gas discharge port, the device input cost is lower, simple process, the harmful substance after the processing is convenient for recycle.
Preferably, the water mist inlet 12 is disposed below the exhaust gas inlet 11.
Because the solid particle in the waste gas is heavier and density is great, can appear sinking phenomenon, then tiny water smoke because density is less, can appear floating phenomenon, such design can make the intensive mixing between waste gas and the water smoke to waste gas treatment efficiency has been improved widely.
Preferably, the exhaust gas treatment device 100 further comprises an ultrasonic atomizer in communication with the water mist inlet 12, wherein the ultrasonic atomizer is used for producing fine water mist. By utilizing the ultrasonic technology, the water mist particles are finer, and the waste gas treatment efficiency is further improved.
Preferably, a stirring device is arranged in the mixing chamber 10, and the stirring device is a rotating centrifugal impeller 20.
After mixing and agglomeration, the waste gas containing large pollutant particle groups in the mixing chamber 10 is captured by the high-speed centrifugal impeller and thrown away from the impeller when the pipeline passes through the high-speed impeller, and the pollutant particle groups containing large water content are deposited on the pipeline wall around the high-speed impeller to form a mixture of high-concentration pollutants and water and are discharged by upward overflow. The exhaust gas separated and purified in this way is discharged to the atmosphere if it meets the emission standard. If the waste gas of the primary treatment does not reach the emission standard, secondary purification treatment in the same process can be carried out.
Preferably, the mixing chamber 10 is communicated with a second chamber 40 for collecting the pollutant particle mass at the upper part thereof, the rotating centrifugal impeller 20 is positioned in the second chamber 40, the flow area of a first connecting channel 50 positioned between the mixing chamber 10 and the second chamber 40 is smaller than the cross-sectional area of the second chamber 40, the flow area of the first connecting channel 50 is smaller than the cross-sectional area of the mixing chamber 10, and the pollutant particle mass containing moisture is continuously deposited in the mixing chamber 10, overflows into the second chamber 40 and flows out of the second chamber 40.
Through being equipped with second chamber 40 in the upper portion of mixing chamber 10, and the flow area of first connecting channel 50 is all less than the cross-sectional area of second chamber 40, mixing chamber 10, is convenient for like this on the one hand to store the pollutant particle group in second chamber 40 and be in high concentration solution state, and on the other hand is convenient for the pollutant particle group that contains moisture directly by rotatory centrifugal impeller 20 throw off in second chamber 40 and outwards discharge, has further improved exhaust-gas treatment efficiency.
Preferably, in order to facilitate the accelerated discharge of the pollutant particle mass by using the gravity factor, the bottom of the second chamber 40 is provided with a pollutant particle mass discharge duct 13.
Preferably, a deflector plate 41 is provided in said second chamber 40 and obliquely above and close to the discharge duct 13 of the mass of pollutant particles, so as to smoothly ensure the accelerated discharge of the mass of pollutant particles outwards.
Preferably, in order to smoothly discharge the exhaust gas without interference, the exhaust gas treatment device 100 further includes a purge gas discharge pipe 30 disposed at the top of the mixing chamber 10, wherein the purge gas discharge pipe 30 is bent in an arc, and an outlet direction of the purge gas discharge pipe 30 is horizontal.
Preferably, the included angle between the guide plate 41 and the horizontal plane is 30-45 degrees, so as to adapt to the actual production requirement.
Example 2
As shown in fig. 1-2, the present invention further provides a method for treating waste gas, comprising the steps of introducing waste gas 200 and water mist 300 into the mixing chamber 10, respectively, mixing and agglomerating the waste gas 200 and the water mist 300 in the mixing chamber 10, adsorbing the water mist by pollutant particles in the waste gas, forming pollutant particle clusters, and simultaneously separating and purifying the waste gas; after mixing and agglomeration are carried out in the mixing chamber 10, pollutant particle groups containing moisture are continuously deposited in the mixing chamber 10 and overflow out of the mixing chamber 10, and the separated and purified waste gas 200 is discharged out of the mixing chamber 10.
The treatment method is simple and low in cost, but is very convenient and effective, industrial waste gas or domestic waste gas, namely organic waste gas or inorganic waste gas, is sent into the mixing chamber through a pipeline, is also sent into the mixing chamber through water mist, the waste gas and the fine water mist are fully mixed and agglomerated, and pollutants in the waste gas adsorb the water mist to form larger pollutant particle groups. Similar to the formation principle of raindrops in the atmosphere, the method has the advantages of low input cost and simple procedure, and the treated harmful substances are convenient to recycle, so that the technical problems that the input cost is high, the procedure is complex, and the treated harmful substances cannot be recycled and need great energy for subsequent treatment and management in the prior art are solved.
Preferably, the exhaust gas 200 and the water mist 300 are stirred and mixed in the mixing chamber 10, and the water mist 300 is made into fine particles by an ultrasonic method. By utilizing the ultrasonic technology, the water mist particles are finer, and the waste gas treatment efficiency is further improved.
Preferably, a stirring device is provided in the mixing chamber 10, which stirring device is designed as a rotating centrifugal impeller 20.
Preferably, the separated and purified exhaust gas 200 is discharged from the mixing chamber 10 from above the mixing chamber 10.
Preferably, a second chamber 40 for collecting the pollutant particle mass is communicated with the upper part of the mixing chamber 10, the flow area of a first connecting channel 50 between the mixing chamber 10 and the second chamber 40 is smaller than the cross-sectional area of the second chamber 40, the flow area of the first connecting channel 50 is smaller than the cross-sectional area of the mixing chamber 10, and the pollutant particle mass containing moisture is continuously deposited in the mixing chamber 10, overflows into the second chamber 40 and flows out from the second chamber 40.
Preferably, a pollutant particle mass discharging pipe 13 is provided at the bottom of the second chamber 40, and a deflector 41 is provided in the second chamber 40 and above the pollutant particle mass discharging pipe 13 in an inclined manner, and the pollutant particle mass flows into the pollutant particle mass discharging pipe 13 along the deflector 41 and is discharged to the outside.
It should be noted that the pollutant particle group (mixture of high concentration pollutant and water) can be recovered for the second time after water removal and concentration, or be post-treated by burning, explanation, etc.
In addition, because the fine water mist is different from water in a liquid state, the method has the greatest characteristic that pollutants in the waste gas can be concentrated and separated firstly, and can be recycled for the second time, so that the raw materials in production or life can be recycled. Secondly, the equipment manufactured by the method can be flexibly treated according to the waste gas treatment capacity, and has small volume. Thirdly, the concentration of the pollutants contained in the gas treated by the method is greatly reduced compared with the concentration of the pollutants in the gas treated by other methods, and zero pollution emission can be realized after multiple processes.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. The waste gas treatment method is characterized by comprising the following steps of respectively introducing waste gas (200) and water mist (300) into a mixing chamber (10), mixing and agglomerating the waste gas (200) and the water mist (300) in the mixing chamber (10), adsorbing the water mist by pollutant particles in the waste gas, forming pollutant particle clusters, and simultaneously separating and purifying the waste gas; after mixing and agglomeration are carried out in the mixing chamber (10), pollutant particle groups containing moisture are continuously deposited in the mixing chamber (10) and overflow out of the mixing chamber (10), and the separated and purified waste gas (200) is discharged out of the mixing chamber (10).
2. An exhaust gas treatment method according to claim 1, wherein the exhaust gas (200) and the water mist (300) are agitated and mixed in the mixing chamber (10), and the water mist (300) is made into fine particles by an ultrasonic method.
3. An exhaust gas treatment method according to claim 1, characterized in that a stirring device is provided in the mixing chamber (10), which stirring device is designed as a rotating centrifugal impeller (20).
4. An exhaust gas treatment method according to claim 1, characterized in that the separately cleaned exhaust gas (200) is discharged from the mixing chamber (10) from above the mixing chamber (10).
5. An exhaust gas treatment method according to any one of claims 1-4, characterized in that a second chamber (40) for collecting the pollutant particle mass is connected to the upper part of the mixing chamber (10), a first connecting channel (50) between the mixing chamber (10) and the second chamber (40) has a smaller flow area than the cross-sectional area of the second chamber (40), the first connecting channel (50) has a smaller flow area than the cross-sectional area of the mixing chamber (10), and the pollutant particle mass containing moisture is continuously deposited in the mixing chamber (10), overflows upwards into the second chamber (40) and flows out of the second chamber (40).
6. An exhaust gas treatment method according to claim 5, wherein a pollutant particle mass discharging duct (13) is provided at the bottom of the second chamber (40), and a deflector (41) is provided in the second chamber (40) and obliquely above the pollutant particle mass discharging duct (13), and the pollutant particle mass flows into the pollutant particle mass discharging duct (13) along the deflector (41) and is discharged to the outside.
7. The waste gas treatment device is characterized in that the waste gas treatment device (100) comprises a mixing chamber (10), the mixing chamber (10) is provided with a waste gas inlet (11) and a water mist inlet (12), and the upper part of the mixing chamber (10) is respectively provided with a pollutant particle group discharge port and a purified gas discharge port.
8. An exhaust gas treatment device according to claim 7, characterized in that a stirring device is arranged in the mixing chamber (10), said stirring device being a rotating centrifugal impeller (20).
9. An exhaust gas treatment device according to claim 7 or 8, characterized in that the mixing chamber (10) is connected in its upper part to a second chamber (40) for collecting the pollutant particles, the rotating centrifugal impeller (20) is located in the second chamber (40), a first connecting channel (50) between the mixing chamber (10) and the second chamber (40) has a smaller flow area than the cross-sectional area of the second chamber (40), the first connecting channel (50) has a smaller flow area than the cross-sectional area of the mixing chamber (10), and the pollutant particles containing moisture are continuously deposited in the mixing chamber (10), overflow upwards into the second chamber (40) and out of the second chamber (40).
10. An exhaust gas treatment device according to claim 9, characterized in that the bottom of the second chamber (40) is provided with a pollutant particle mass discharge duct (13), and a deflector (41) is arranged in the second chamber (40) and obliquely above the pollutant particle mass discharge duct (13).
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| CN202011097923.5A CN112206614A (en) | 2020-10-14 | 2020-10-14 | Waste gas treatment method and waste gas treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433267A (en) * | 2021-06-11 | 2021-09-24 | 青岛海尔空调器有限总公司 | Air abnormity early warning method, device, equipment, medium and program product |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433267A (en) * | 2021-06-11 | 2021-09-24 | 青岛海尔空调器有限总公司 | Air abnormity early warning method, device, equipment, medium and program product |
| CN113433267B (en) * | 2021-06-11 | 2023-12-15 | 青岛海尔空调器有限总公司 | Air abnormality early warning method, device, equipment, medium and program product |
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