Incinerator cooling and flue gas purification system

Abstract

The present invention discloses an incinerator cooling and flue gas purification system, which is characterized by comprising: a furnace assembly, including a shell, a combustion chamber, a first partition, an ash accumulation chamber, a second partition and a liquid storage chamber, wherein the first partition and the second partition are arranged in the shell to divide the space in the shell into a combustion chamber, an ash accumulation chamber and a liquid storage chamber; a cooling and purification system, including a water circulation passage and an air circulation passage, wherein the water circulation passage is arranged inside the shell, and the air circulation passage connects the space inside and outside the shell; the present invention arranges a flue gas circulation and a water cooling circulation to cool the incinerator during combustion and filter and purify the flue gas.

Description

Technical Field

[0001] The present invention relates to the technical field of incineration flue gas purification, in particular to an incinerator cooling and flue gas purification system. Background Art

[0002] Although the incinerator limits the location of incineration to avoid possible fires, the flame temperature in the furnace can reach as high as 800-1100°C; in addition, the flue gas temperature associated with the combustion of materials is also very high, and is mixed with a large amount of particulate pollutants. The national "Integrated Emission Standards for Air Pollutants" (GB16297-1996) has strictly limited the concentration of particulate matter emitted by flue gas. Due to the high temperature of the flue gas, it cannot be directly treated by conventional purification systems.

[0003] According to the above analysis, reasonable and efficient incinerator cooling and flue gas purification technology is the main technical difficulty faced by the widespread application of incinerators. In addition, the flue gas emission pipes of general incinerators and their combustion equipment are all above the equipment, which does not conform to the aesthetics of traditional Chinese culture. Therefore, it is necessary to develop an incinerator cooling and flue gas purification system in which the flue gas emission pipe is not on the top of the incinerator and can effectively reduce the furnace temperature and the content of flue gas particulate impurities, so as to promote the promotion and use of incinerators nationwide. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

[0005] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is that the temperature in the combustion furnace of the traditional incinerator is too high and the exhausted flue gas is not treated and seriously pollutes the environment.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an incinerator cooling and flue gas purification system, characterized in that: it includes a furnace assembly, including a shell, a combustion chamber, a first partition, an ash accumulation chamber, a second partition and a liquid storage chamber, the first partition and the second partition are arranged in the shell, dividing the space inside the shell into a combustion chamber, an ash accumulation chamber and a liquid storage chamber; a cooling and purification system, including a water circulation passage and an air circulation passage, the water circulation passage is arranged inside the shell, and the air circulation passage connects the space inside and outside the shell.

[0008] As a preferred embodiment of the incinerator cooling and flue gas purification system of the present invention, the gas circulation passage includes a furnace cooling pipe and a smoke exhaust pipe, the furnace cooling pipe is arranged in the shell and connects the combustion chamber and the liquid storage chamber; the smoke exhaust pipe is arranged in the soil, one end of the smoke exhaust pipe is connected to the liquid storage chamber, and the other end extends outside the soil and communicates with the outside world.

[0009] As a preferred embodiment of the incinerator cooling and flue gas purification system of the present invention, the water circulation path includes a clean water tank, a cooling pump, a spray pipe and a sewage tank, the clean water tank and the sewage tank are arranged in the liquid storage chamber, and a third partition is provided between the clean water tank and the sewage tank; the spray pipe is arranged in the furnace cooling pipe, and the cooling pump is connected to the clean water tank and the spray pipe; one end of the furnace cooling pipe is communicated with the sewage tank, and one end of the exhaust pipe is communicated with the clean water tank.

[0010] As a preferred solution of the incinerator cooling and flue gas purification system of the present invention, the third partition includes a solid plate, a filter plate and a flue gas filter, and the filter plate is arranged above the solid plate; the flue gas filter is arranged on the filter plate and contacts the second partition.

[0011] As a preferred solution of the incinerator cooling and flue gas purification system of the present invention, the top surface of the solid plate is higher than the liquid level in the clean water pool.

[0012] As a preferred solution of the incinerator cooling and flue gas purification system of the present invention, a water inlet valve, a first drain valve and a second drain valve are provided on the outside of the liquid storage chamber, the water inlet valve is provided on the side of the liquid storage chamber and communicates with the clean water tank, the first drain valve is provided at the bottom of the liquid storage chamber and communicates with the clean water tank, and the second drain valve is provided at the bottom of the liquid storage chamber and communicates with the sewage tank.

[0013] As a preferred solution of the incinerator cooling and flue gas purification system of the present invention, the shell is provided with a furnace door and air inlet louvers, the furnace door is provided on the side wall of the combustion chamber, and the air inlet louvers are provided on the side of the ash storage chamber.

[0014] As a preferred solution of the incinerator cooling and flue gas purification system of the present invention, the first partition includes a support plate, a movable plate and a power member, the movable plate is arranged below the support plate, and the power member is connected to the movable plate.

[0015] As a preferred solution of the incinerator cooling and flue gas purification system of the present invention, a first filter is provided on the top of the furnace cooling pipe.

[0016] As a preferred solution of the incinerator cooling and flue gas purification system of the present invention, a smoke exhaust fan and a second filter are provided inside the smoke exhaust pipe.

[0017] Beneficial effects of the present invention: The present invention provides a flue gas circulation and a water cooling circulation to cool the burning incinerator and filter and purify the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0019] Figure 1 A schematic diagram of the overall structure of an incinerator cooling and flue gas purification system according to an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a liquid storage chamber in an incinerator cooling and flue gas purification system according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a water circulation path in an incinerator cooling and flue gas purification system according to an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of an air flow path in an incinerator cooling and flue gas purification system according to an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a first baffle in a first state of an incinerator cooling and flue gas purification system according to an embodiment of the present invention;

[0024] Figure 6 A schematic structural diagram of a first baffle in a second state in an incinerator cooling and flue gas purification system according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the connection structure of the support plate and the movable plate in the incinerator cooling and flue gas purification system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, these schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0029] Furthermore, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1

[0031] Reference Figure 1 and Figure 2 This embodiment provides an incinerator cooling and flue gas purification system, including a furnace assembly 100, including a shell 101, a combustion chamber 102, a first partition 103, an ash accumulation chamber 104, a second partition 105 and a liquid storage chamber 106, the first partition 103 and the second partition 105 are arranged in the shell 101, dividing the space in the shell 101 into the combustion chamber 102, the ash accumulation chamber 104 and the liquid storage chamber 106; a cooling and purification system 200, including a water circulation passage 201 and an air circulation passage 202, the water circulation passage 201 is arranged inside the shell 101, and the air circulation passage 202 connects the inner and outer spaces of the shell 101.

[0032] The gas circulation passage 202 includes a furnace cooling pipe 202a and a smoke exhaust pipe 202b. The furnace cooling pipe 202a is arranged in the shell 101, connecting the combustion chamber 102 and the liquid storage chamber 106; the smoke exhaust pipe 202b is arranged in the soil, one end of the smoke exhaust pipe 202b is connected to the liquid storage chamber 106, and the other end extends outside the soil and communicates with the outside world.

[0033] The water circulation passage 201 includes a clean water tank 201a, a cooling pump 201b, a spray pipe 201c and a sewage tank 201d. The clean water tank 201a and the sewage tank 201d are arranged in the liquid storage chamber 106, and a third partition 201e is arranged between the clean water tank 201a and the sewage tank 201d; the spray pipe 201c is arranged in the furnace cooling pipe 202a, and the cooling pump 201b connects the clean water tank 201a and the spray pipe 201c; one end of the furnace cooling pipe 202a is connected to the sewage tank 201d, and one end of the smoke exhaust pipe 202b is connected to the clean water tank 201a.

[0034] In this embodiment, the incinerator is divided into three layers. When in use, the combustion material is placed on the first partition 103 and burned in the combustion chamber 102. Most of the ash produced by the combustion is deposited on the first partition 103 and falls into the ash storage chamber 104 through the first partition 103 during the combustion process for collection and centralized treatment. The second partition 105 is a solid partition that separates the ash storage chamber 104 from the liquid storage chamber 106. The combustion chamber 102, the ash storage chamber 104 and the liquid storage chamber 106 are separated. 06 are arranged from top to bottom, the combustion chamber 102 is arranged at the uppermost layer, and the liquid storage chamber 106 is arranged at the lowermost layer; the furnace cooling pipe 202a is arranged vertically, passing through the first partition 103 and the second partition 105, the upper end opening of which is communicated with the combustion chamber 102, and the lower end opening is communicated with the liquid storage chamber 106, and the ash accumulation chamber 104 is not communicated with the inside of the furnace cooling pipe 202, so the furnace cooling pipe 202a allows the air in the combustion chamber 102 and the liquid storage chamber 106 to circulate with each other.

[0035] The gas circulation passage 202 is used to guide the flue gas generated by combustion in the furnace and discharge it into the furnace, and cool and purify the flue gas during the discharge process, specifically removing impurities such as soot mixed in the flue gas produced by combustion. After purification, the flue gas is discharged into the furnace, so that the air in the furnace and the outside world are circulated; the furnace cooling pipe 202a performs preliminary filtration and guidance on the flue gas, and cools the flue gas during the circulation process; the exhaust pipe 202b guides the flue gas that has been preliminarily filtered and cooled and discharges it out of the furnace body.

[0036] The water circulation passage 201 is used to cool down the burning furnace. When working, the cooling pump 201b draws clean water from the clean water tank 201a and transports it to the spray pipe 201c for spraying cooling outward. In this process, the flue gas in the furnace is also purified. The sprayed water flows into the sewage tank 201d, and after filtration and adsorption by the third partition 201e, it flows into the clean water tank 201a for reuse.

[0037] Example 2

[0038] Reference Figure 3The difference between this embodiment and the previous embodiment is that the third partition 201e includes a solid plate 201e-1, a filter plate 201e-2 and a smoke filter 201e-3, and the filter plate 201e-2 is arranged above the solid plate 201e-1; the smoke filter 201e-3 is arranged on the filter plate 201e-2 and contacts the second partition 105.

[0039] The top surface of the solid plate 201e-1 is higher than the liquid level in the clean water tank 201a.

[0040] An inlet valve 106a, a first drain valve 106b and a second drain valve 106c are provided on the outside of the liquid storage chamber 106. The inlet valve 106a is provided on the side of the liquid storage chamber 106 and communicates with the clean water tank 201a. The first drain valve 106b is provided at the bottom of the liquid storage chamber 106 and communicates with the clean water tank 201a. The second drain valve 106c is provided at the bottom of the liquid storage chamber 106 and communicates with the sewage tank 201d.

[0041] In this embodiment, the path of the circulating water flow is that the cooling pump 201b draws clean water from the clean water pool 201a and transports it to the spray pipe 201c for spraying cooling outward. The sprayed water also adheres to the solid particles produced by combustion carried in the flue gas, increasing the weight of the solid particles so that they fall down and fall into the sewage pool 201d together with the water. Since the spray pipe 201c is arranged inside the furnace cooling pipe 202a, the sprayed water will be confined in the furnace cooling pipe 202a, and slide down along the inner wall of the furnace cooling pipe 202a and flow into the sewage pool 201d; preferably, a circle of enclosure structure is provided on the outer periphery of the top of the furnace cooling pipe 202a to ensure that water will not be sprayed into the combustion chamber 102 and affect the combustion of the combustibles; the filter plate 201e-2 is a structure including a filter mesh and activated carbon, which can filter and adsorb water containing impurities, thereby converting sewage into relatively clean water.

[0042] The water with impurities flowing into the sewage pool 201d is initially blocked by the solid plate 201e-1 and deposited in the sewage pool 201d. As the spraying proceeds, the liquid level continues to rise. After reaching the top surface of the solid plate 201e-1, the water in the sewage pool will pass through the filter plate 201e-2. The sewage is purified under the filtration and adsorption action of the filter plate 201e-2. The purified water flows into the clean water pool 201a and is again extracted and recycled by the water pump 201b. When in use, the liquid level in the clean water pool 201a is controlled to be lower than the top surface of the solid plate 201e-1 to ensure that the water in the sewage pool 201d flows into the clean water pool 201a after exceeding the top surface of the solid plate 201e-1, and to prevent the water in the clean water pool 201a from flowing back directly into the sewage pool.

[0043] The water inlet valve 106a is used to add water to the clean water tank 201a, and the first drain valve 106b is used to drain the clean water tank 201a. Since the filtering capacity of the filter plate 201e-2 is limited, after long-term use, the clean water in the clean water tank 201a gradually becomes sewage that is difficult to be extracted and used. Therefore, it is necessary to replace the water therein, drain the sewage, and inject clean water; the second drain valve 106c is used to discharge the sewage from the sewage tank 201d.

[0044] Example 3

[0045] Reference Figure 4 The difference between this embodiment and the previous embodiment is that a furnace door 101a and an air inlet louver 101b are provided on the shell 101, the furnace door 101a is provided on the side wall of the combustion chamber 102, and the air inlet louver 101b is provided on the side of the ash storage chamber 104.

[0046] A first filter screen 202a-1 is provided on the top of the furnace cooling pipe 202a.

[0047] A smoke exhaust fan 202b-1 and a second filter 202b-2 are provided inside the smoke exhaust pipe 202b.

[0048] In this embodiment, the combustible material is placed on the first partition 103 through the furnace door 101a for combustion, and air enters the combustion chamber 102 from the air inlet louver 101b to assist combustion. The smoke exhaust sub-unit 202b-1 operates in the smoke exhaust pipe 202b, so that the smoke generated in the combustion chamber 102 enters the sewage pool 201d through the furnace cooling pipe 202a, is filtered through the smoke filter 201e-3, enters the clean water pool 201a, and then enters the smoke exhaust pipe 202b, is filtered through the second filter 202b-2, and is discharged to the outside.

[0049] Specifically, a top cover is provided at the upper end of the furnace cooling pipe 202a, and a first filter 202a-1 is provided on the side of the top cover. The first filter 202a-1 performs preliminary filtration on the flue gas, and excludes large-volume soot from the furnace cooling pipe 202a. Smaller-volume particles enter the furnace cooling pipe 202a with the flue gas, and are cooled and solid particles are deposited under the moisture sprayed by the spray pipe 201c. The flue gas flowing from the combustion chamber 102 to the sewage pool 201d has been mostly cooled and purified. Subsequently, the flue gas is filtered again by the flue gas filter 201e-3 in the process of flowing from the sewage pool 201d to the clean water pool 201a, and then the flue gas enters the exhaust pipe 20b buried underground, and uses the soil to absorb the residual heat of the flue gas. Finally, the flue gas is discharged to the outside after the final filtration by the second filter 202b-2.

[0050] Example 4

[0051] Reference Figures 5-7The difference between this embodiment and the previous embodiment is that the first partition 103 includes a support plate 103a, a movable plate 103b and a power member 103c, the movable plate 103b is arranged below the support plate 103a, and the power member 103c is connected to the movable plate 103b.

[0052] In this embodiment, the combustible material is placed on the support plate 103a for combustion. The setting of the movable plate 103b helps the air entering the ash storage chamber 104 from the air inlet louver 101b to better pass through the first partition 103 into the combustion chamber 102 to assist the combustion of the combustible material. At the same time, it helps the soot generated by the combustion to fall into the ash storage chamber 104 more quickly for cleaning, rather than accumulating on the first partition 103, making it difficult to fall into the ash storage chamber 104 and hindering air circulation, affecting combustion.

[0053] Specifically, the support plate 103a is a grid plate, and a slide groove is provided on the side of the support plate 103a. The end of the movable plate 103b is placed in the slide groove, and the movable plate 103b can slide in the slide groove. Initially, the movable plate 103b fills a part of the grid holes of the support plate 103a, so that the combustion objects have more placement area, and avoids the situation where the holes are too large and the unburned combustion objects fall into the ash storage chamber 104 from the holes; the end of the movable plate 103b is connected to the power piece 103c, and the power piece 103c is a push rod motor. The movable plate 103b is driven by the push rod motor to move. A protrusion 103b-1 is provided, and a sliding shaft is provided on the protrusion 103b-1. A tilting rod 103a-1 is provided on the side of the support plate 103a. The tilting rod 103a-1 is connected to the support plate 103a axis, and the tilting rod 103a-1 can rotate along the axis. A guide groove is provided on the tilting rod 103a-1, and the sliding shaft is provided in the guide groove. When the movable plate 103b moves, the sliding shaft slides in the guide groove, causing one end of the tilting rod 103a-1 to be pressed down, and the tilting rod 103a-1 rotates around the axis, and the other end thereof is tilted to stir the combustion material to make the air circulation more complete and the ashes produced by the combustion slide into the ash storage chamber 104 at the same time.

[0054] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An incinerator cooling and flue gas purification system, characterized by: include, A burner assembly (100) comprises a shell (101), a combustion chamber (102), a first partition (103), an ash accumulation chamber (104), a second partition (105) and a liquid storage chamber (106); the first partition (103) and the second partition (105) are arranged in the shell (101) to divide the space in the shell (101) into the combustion chamber (102), the ash accumulation chamber (104) and the liquid storage chamber (106); A cooling and air purification system (200) comprises a water circulation passage (201) and an air circulation passage (202), wherein the water circulation passage (201) is arranged inside the shell (101), and the air circulation passage (202) communicates with the inner and outer spaces of the shell (101); The gas circulation passage (202) includes a furnace cooling pipe (202a) and a smoke exhaust pipe (202b); the furnace cooling pipe (202a) is provided on the shell (101) and communicates with the combustion chamber (102) and the liquid storage chamber (106); The smoke exhaust pipe (202b) is arranged in the soil, one end of the smoke exhaust pipe (202b) is communicated with the liquid storage chamber (106), and the other end extends out of the soil and communicates with the outside world; The water circulation passage (201) comprises a clean water pool (201a), a cooling pump (201b), a spray pipe (201c) and a sewage pool (201d); the clean water pool (201a) and the sewage pool (201d) are arranged in the liquid storage chamber (106); and a third partition plate (201e) is provided between the clean water pool (201a) and the sewage pool (201d); The spray pipe (201c) is arranged in the furnace cooling pipe (202a), and the cooling pump (201b) is connected to the clean water pool (201a) and the spray pipe (201c); One end of the furnace cooling pipe (202a) is in communication with the sewage pool (201d), and one end of the smoke exhaust pipe (202b) is in communication with the clean water pool (201a); A top cover is provided at the upper end of the furnace cooling pipe (202a), and a first filter screen (202a-1) is provided on the side of the top cover. The first filter screen (202a-1) performs preliminary filtration on the flue gas, excluding large-volume soot from the furnace cooling pipe (202a), while smaller-volume particles enter the furnace cooling pipe (202a) along with the flue gas.

2. The incinerator cooling and flue gas purification system according to claim 1, characterized in that: The third partition plate (201e) comprises a solid plate (201e-1), a filter plate (201e-2) and a smoke filter (201e-3), wherein the filter plate (201e-2) is arranged above the solid plate (201e-1); The smoke filter (201e-3) is arranged on the filter plate (201e-2) and is in contact with the second partition (105).

3. The incinerator cooling and flue gas purification system according to claim 2, characterized in that: The top surface of the solid plate (201e-1) is higher than the liquid level in the clean water tank (201a).

4. The incinerator cooling and flue gas purification system according to claim 3, characterized in that: An inlet valve (106a), a first drain valve (106b) and a second drain valve (106c) are provided on the outside of the liquid storage chamber (106); the inlet valve (106a) is provided on the side of the liquid storage chamber (106) and communicates with the clean water pool (201a); the first drain valve (106b) is provided at the bottom of the liquid storage chamber (106) and communicates with the clean water pool (201a); and the second drain valve (106c) is provided at the bottom of the liquid storage chamber (106) and communicates with the sewage pool (201d).

5. The incinerator cooling and flue gas purification system according to any one of claims 1 to 4, characterized in that: The shell (101) is provided with a furnace door (101a) and an air inlet louver (101b); the furnace door (101a) is provided on a side wall of the combustion chamber (102); and the air inlet louver (101b) is provided on a side of the ash accumulation chamber (104).

6. The incinerator cooling and flue gas purification system according to claim 1, characterized in that: The first partition (103) comprises a support plate (103a), a movable plate (103b) and a power piece (103c); the movable plate (103b) is arranged below the support plate (103a); and the power piece (103c) is connected to the movable plate (103b).

7. The incinerator cooling and flue gas purification system according to claim 5, characterized in that: A smoke exhaust fan (202b-1) and a second filter (202b-2) are provided inside the smoke exhaust pipe (202b).

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