Energy-saving equipment and method for rapid bio-drying of organic solid waste in a low-temperature environment

Abstract

The present invention proposes an energy-saving equipment and method for rapid bio-drying of organic solid waste in a low-temperature environment in a strip-type stack, which belongs to the field of bio-drying equipment. It solves the problems of low exhaust efficiency and high difficulty due to the large space and low utilization rate of the drying site, and the water vapor generated in the bio-drying process is easy to diffuse and has a large distribution range, resulting in slow drying rate and high energy consumption cost. The movable push-pull insulation shed of the present invention provides a small space fermentation site for strip-type bio-drying, which can gather the steam generated in the drying process, thereby reducing the total volume of steam extraction and improving the water removal efficiency. A multi-layer, multi-functional insulation structure is established on the periphery of the shed to reduce environmental heat loss, making it suitable for organic solid waste bio-drying sites under different environmental conditions. The intermittent ventilation and steam extraction process proposed in the present invention can fully utilize the aerobic fermentation heat generated by bio-drying, further reduce equipment energy consumption, shorten the bio-drying cycle, and improve drying efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of biological drying equipment, and in particular relates to a low-temperature environment organic solid waste strip-stack type rapid biological drying energy-saving equipment and method. Background Art

[0002] Biological drying refers to a drying technology that uses microorganisms to controllably promote the degradation and metabolism of organic matter in organic solid wastes with high water content, such as manure and sludge, under aerobic conditions, and uses the heat energy generated by the aerobic fermentation process to remove moisture from the materials.

[0003] Biological drying technology is an in-situ drying technology. Unlike other drying methods such as electric drying and solar drying, it does not require external heating and has a high thermal energy utilization rate. However, due to the long heat production cycle and low heat production power of the aerobic fermentation process, the environmental heat loss is huge, which has a great impact on the drying effect. Therefore, in the low temperature environment in winter, the biological drying process of sludge, manure, etc. has a long cycle and the drying effect is significantly poor.

[0004] In the strip-type biological drying site, a large-diameter, high-flow gas pipeline is generally arranged on the top of the plant, which can remove the hot and humid steam generated during the drying process by means of steam extraction to achieve the effect of dehydrating the organic solid waste. However, due to the large space of the drying site but low utilization rate, the water vapor generated during the biological drying process is easy to diffuse and has a large distribution range, resulting in low exhaust efficiency and high difficulty, which ultimately leads to problems such as slow drying rate and high energy consumption cost.

[0005] On the other hand, under different environmental conditions, the biological drying system has different insulation and operability requirements. How to design the peripheral structure and facilities of the fermentation pile so that it can adapt to the process requirements under different environmental conditions is of great significance to maintaining the stable operation of the plant's biological drying project. Summary of the invention

[0006] In view of this, in order to solve the technical problems raised in the above background, the present invention aims to propose an energy-saving equipment and method for rapid bio-drying of organic solid waste in a low-temperature environment, and use a self-designed movable push-pull insulation shed to provide a small space fermentation place for bio-drying of bio-drying, which can gather the steam generated during the drying process, thereby reducing the total volume of steam extraction and improving the dewatering efficiency. In addition, a multi-layer, multi-functional insulation structure is established on the periphery of the shed to reduce environmental heat loss, so that it is suitable for bio-drying places of organic solid waste under different environmental conditions. Finally, by using the intermittent ventilation and steam extraction process proposed in the present invention, the aerobic fermentation heat energy generated by bio-drying can be fully utilized, which can further reduce the energy consumption of the equipment and shorten the bio-drying cycle, thereby improving the drying efficiency. The present invention is suitable for bio-drying places of bio-drying of solid wastes such as poultry and livestock manure and sludge of various scales for resource utilization of organic solid waste, and is particularly suitable for places for bio-drying of large-scale, long-stacked (≥20m) organic solid waste.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a low-temperature environment organic solid waste strip-stack rapid biological drying energy-saving equipment, including multiple sections of push-pull insulation sheds, the strips are stacked inside the shed body for aerobic fermentation, each section of the push-pull insulation shed includes an insulation shed body, an insulation layer, multiple exhaust pipes, pulleys and insulation curtains, an insulation layer is installed on the insulation shed body, multiple exhaust pipes are installed on the side of the insulation shed body, a pulley is arranged at the bottom of the insulation shed body, and insulation curtains are arranged at both ends of the insulation shed body.

[0008] Furthermore, the insulation layer includes an outer insulation layer and an inner insulation layer or a separate inner insulation layer, and the outer insulation layer is arranged on the outside of the inner insulation layer. The inner insulation layer can be used alone in a warm environment, and can be used together with the outer insulation layer for a low temperature environment in winter.

[0009] Furthermore, the inner thermal insulation layer includes a waterproof layer and a thermal insulation coating, a thermal insulation coating is installed between the outer thermal insulation layer and the waterproof layer, and the waterproof layer is a high-strength waterproof canvas.

[0010] Furthermore, the thermal insulation coating is an aerogel composite coating, which is composed of polyacrylic resin or silicone resin as a base coating, and SiO 2 Aerogel and hollow microspheres or polyurethane or TiO 2 The compounding is carried out, and the formula ratio is: the mass ratio of basic coating: aerogel: hollow microsphere: dispersant: thickener = 60-80: 10-20: 10-20: 0.3: 0-0.5.

[0011] Furthermore, the thickness of the inner insulation layer is ≤2 cm.

[0012] Furthermore, the thickness of the outer insulation layer is ≥5 cm, and the material is insulation materials such as polyurethane, rubber-plastic board or rock wool.

[0013] Furthermore, the push-pull type insulation shed also includes a support rod, and the inner insulation layer is arranged on the support rod and fixed, and moves with the support rod; the length of the push-pull type insulation shed is designed according to the length of the strip stack, and the length of the strip stack can be continuously extended, and the height is not less than 2m.

[0014] Furthermore, the spacing between the multiple exhaust pipes is 5 to 25 m, the pipe diameter is not less than 50 mm, and the exhaust pipes are connected to a vacuum pump.

[0015] Furthermore, in the internal area of ​​the push-pull insulation shed, multiple ventilation ducts are buried side by side on the surface of the site and opened regularly for oxygen supply.

[0016] A drying method using a low-temperature environment organic solid waste strip-type rapid biological drying energy-saving equipment, including strip-type aerobic fermentation and intermittent steam exhaust,

[0017] 1. Strand-type aerobic fermentation, including the following steps:

[0018] Step 1: pre-treat and dry the organic solid waste materials such as sludge to make their moisture content no higher than 70%, and then stack them in the form of strips;

[0019] Step 2: Push and pull the push-pull insulation shed to unfold it and place it on top of the strip pile;

[0020] Step 3: According to the size and length of the windrow, a hole is opened on one side of the push-pull insulation shed, and multiple detachable exhaust pipes are installed side by side. In the early stage of aerobic fermentation of the raw materials, the exhaust pipes are kept closed to prevent heat loss;

[0021] 2. Intermittent steam exhaust, including the following steps:

[0022] Step 1: Pile the strips in a push-pull insulation shed for aerobic fermentation;

[0023] Step 2: According to different environmental conditions, different frequencies of steam extraction and pile turning operations are performed. However, before steam extraction, the material temperature is required to be higher than 55°C and remain stable. Then, the exhaust pipe is opened, and the vacuum pump is turned on for 10 to 60 minutes to quickly exhaust steam. The temperature of the pile drops. At this time, the pile body temperature is required to be no lower than 45°C, which is conducive to subsequent rapid heating. After that, the steam extraction is stopped, the exhaust pipe is closed, and heat accumulation begins, and this cycle is repeated;

[0024] Step 3: After 3 to 10 cycles of steam extraction, turn the pile. In severe cold environments, the number of times the pile is turned should be reduced to reduce heat loss. Before turning the pile, first put away the outer insulation layer and fold the push-pull insulation shed with the pulley. When turning the pile, turn it manually or mechanically, and finally unfold the push-pull insulation shed. Repeat the above steps until the moisture content of the material reaches the expected standard.

[0025] Compared with the prior art, the low-temperature environment organic solid waste strip-type rapid biological drying energy-saving equipment and drying method described in the present invention have the following beneficial effects:

[0026] (1) The present invention adopts a self-designed movable push-pull insulation shed for bio-drying of windrows, and the insulation shed can be designed according to the length of the windrows. It is suitable for large-scale, long-winded organic solid waste drying sites. By reducing the space occupied by fermentation, heat loss is reduced, and combined with an intermittent steam extraction process, the energy consumption caused by ventilation and steam extraction operations can be reduced by 40% to 75%.

[0027] (2) The outer periphery of the heat preservation shed of the present invention adopts a multi-layer heat preservation design, which can adapt to the biological drying needs in different seasons. The inner heat preservation layer has the characteristics of foldability, high strength, and good flexibility. It is connected to the bracket and has a good heat preservation effect and is suitable for warm environments. The outer heat preservation layer is thick, has excellent heat preservation performance, is detachable, and can be used in severe cold environments after installation.

[0028] (3) The present invention designs a movable push-pull insulation shed and a matching intermittent exhaust steam drying process. Compared with the traditional strip-bundle biological drying method, the present invention has a short drying cycle and can reduce the drying time by 40% to 60%, thus achieving a better drying effect.

[0029] (4) The present invention has a simple structure, is easy to operate, reduces the frequency of material turning, and is easy to promote on a large scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 It is a structural schematic diagram of the movable push-pull type heat preservation shed of the present invention;

[0032] Figure 2 This is a schematic diagram of the side structure of the heat preservation shed of the present invention;

[0033] Figure 3 This is a schematic diagram of the steam extraction process of the present invention;

[0034] Figure 4 It is the design drawing of the multi-layer thermal insulation structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the heat preservation shed support and pulley structure of the present invention;

[0036] In the figure: 1-external insulation layer; 2-inner insulation layer; 3-exhaust pipe; 4-row stack; 5-push-pull insulation shed; 6-pulley; 7-insulation curtain; 8-vacuum pump; 9-waterproof layer; 10-insulation coating; 11-support rod. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0038] See also Figure 1-5 The present embodiment is described as a low-temperature environment organic solid waste strip pile type rapid biological drying energy-saving equipment, including a multi-section push-pull insulation shed 5, the strip pile 4 is placed inside the shed body for aerobic fermentation, each section of the push-pull insulation shed 5 includes an insulation shed body, an insulation layer, a plurality of exhaust pipes 3, a pulley 6 and an insulation curtain 7, an insulation layer is installed on the insulation shed body, a plurality of exhaust pipes 3 are installed on the side of the insulation shed body, a pulley 6 is arranged at the bottom of the insulation shed body, and insulation curtains 7 are arranged at both ends of the insulation shed body.

[0039] The thermal insulation layer comprises an outer thermal insulation layer 1 and an inner thermal insulation layer 2 , wherein the outer thermal insulation layer 1 is arranged on the outer side of the inner thermal insulation layer 2 .

[0040] The length of the push-pull insulation shed 5 is designed according to the length of the strip pile 4. The length of the strip pile 4 can be continuously extended, and the height requirement is not less than 2m. The entire biological drying system can be divided into multiple sections, each section is 5 to 25m long, and each section is equipped with an exhaust pipe 3 to discharge the hot and humid steam accumulated in the shed. The strip pile 4 does not contact the push-pull insulation shed 5, and the top and bottom are kept at a certain distance from the insulation shed to prevent obstruction of the movement of the insulation shed. In the internal area of ​​the push-pull insulation shed 5, multiple ventilation ducts can be buried side by side on the surface of the site and opened regularly for oxygen supply.

[0041] Insulation curtains 7 are installed at both ends of the push-pull insulation shed 5 to seal and insulate, thereby reducing heat loss at both ends. The inner insulation layer 2 is arranged above the support rod 11 and fixed to move with the support rod 11.

[0042] The inner insulation layer 2 includes a waterproof layer 9 and an insulation coating 10. The waterproof layer 9 is required to have the characteristics of corrosion resistance, high temperature resistance, high strength, good flexibility, airtightness, and watertightness. It can be made of high-strength waterproof canvas and other materials. It can be opened for installing exhaust pipes. The insulation coating 10 can be an aerogel composite coating. The coating is based on a polymer such as polyacrylic resin and silicone resin. SiO 2 Aerogel and hollow microspheres (or polyurethane, TiO 2 Solid fillers such as SiO 2 The mass proportion of aerogel is generally 5% to 25%, and the formula ratio is: the mass ratio of basic coating: aerogel: hollow microspheres: dispersant: thickener = 60-80: 10-20: 10-20: 0.3: 0-0.5. The compounded filler and coating are mixed evenly, and appropriate amounts of dispersants, thickeners and other additives are added to obtain the coating glue, which is applied to the surface of the fabric. After high-temperature drying and other processes, the aerogel thermal insulation coating can be obtained.

[0043] The inner insulation layer 2 is relatively thin (≤2 cm), but has good insulation performance, and the thermal conductivity can reach below 0.05 W / (m·K). It also has high strength and good flexibility. As the inner structure of the push-pull insulation shed 5, it can be folded and stored in conjunction with the push-pull insulation shed 5.

[0044] The outer insulation layer 1 mostly uses thicker insulation materials (≥5cm), and insulation materials such as polyurethane, rubber-plastic board, and rock wool can be selected. Different insulation structures need to be selected according to different environmental conditions. In the low temperature environment in winter, the biological drying cycle is long and the number of operations is small, so the insulation requirements on the periphery of the material are high and the operability requirements are low. On the contrary, in the warm environment in summer, the insulation requirements are relatively low and the operations are more frequent. Therefore, the inner insulation layer 2 can be used alone in a warm environment, and can be used together with the outer insulation layer 1 for low temperature environments in winter.

[0045] On one side of the push-pull insulation shed 5, a plurality of exhaust pipes 3 are installed side by side, and the intermittent steam extraction and ventilation process is combined with the turning operation to achieve a fast and low-energy drying effect of the windrow.

[0046] The drying method using low temperature environment organic solid waste strip-type rapid biological drying energy-saving equipment specifically includes the following steps: strip-type aerobic fermentation and intermittent steam exhaust,

[0047] 1. Strand-type aerobic fermentation, including the following steps:

[0048] Step 1: Pre-treat and dry the organic solid waste materials such as sludge to make their moisture content no higher than 70%, and then stack them in the form of strips. The present invention is mainly suitable for large-scale and long strips of organic solid waste drying, requiring the material stacking height to be no less than 2m.

[0049] Step 2: Push and pull the shed to expand and place it on top of the stack to maintain a relatively sealed environment. If it is in a severe cold environment, cover the shed with an external insulation layer.

[0050] Step 3: According to the size and length of the pile, holes are drilled on one side of the insulation shed, and multiple detachable exhaust pipes are installed side by side. The spacing between pipes is 5 to 25m, and the pipe diameter is not less than 50mm. In the early stage of aerobic fermentation of raw materials, keep the pipes in a closed state to prevent heat loss.

[0051] 2. Intermittent steam exhaust, including the following steps:

[0052] Step 1: The long strip pile 4 is aerobically fermented in the push-pull insulation shed 5. Compared with the open air, the insulation shed provides a small, sealed and heat-insulating fermentation environment, which rapidly accumulates heat and generates a large amount of water vapor.

[0053] Step 2: According to different environmental conditions, different frequencies of steam extraction and pile turning operations are performed, but before steam extraction, the material temperature is required to be higher than 55°C and remain stable. Next, the exhaust pipe 3 is opened, and the vacuum pump 8 is turned on to quickly exhaust steam for 10 to 60 minutes. The temperature of the pile 4 drops. At this time, the pile body temperature is required to be no lower than 45°C, which is conducive to subsequent rapid heating. After that, the steam extraction is stopped, the exhaust pipe 3 is closed, and heat accumulation begins, and this cycle is repeated.

[0054] Step 3: After 3 to 10 cycles of steam extraction, the compost is turned. In severe cold environments, the number of compost turnings should be reduced to reduce heat loss. Before turning the compost, the outer insulation layer 1 is first folded up, and the push-pull insulation shed 5 is folded and stored through the pulley 6. When turning the compost, manual turning or mechanical turning can be adopted, and finally the push-pull insulation shed 5 is unfolded, and the above steps are repeated until the moisture content of the material reaches the expected standard (30% to 45%). Specific implementation method one:

[0056] The device and process were used in a sludge drying site in the northeast region. The site originally used a strip-type biological drying method. Each strip-type pile 4 was about 135m long and was dried in a closed manner by covering with a film. Above the strip-type pile 4, a large-diameter exhaust pipe 3 was used to extract steam and dehumidify, but the drying effect was poor. The average outdoor ambient temperature in the area in winter was about -11°C, and the temperature in summer was 13 to 25°C. The humidity around the biological drying site was higher than 50% for a long time, and the internal humidity was higher than 80% for a long time. Sludge sampling and testing showed that the carbon-nitrogen ratio was 4.5 and the moisture content was as high as 86.3%.

[0057] The biological drying process of the site is improved. First, the height of the strip pile 4 is increased from about 1.8m to 2.3m, and the length of the strip pile 4 remains unchanged. In addition, the movable push-pull insulation shed 5 and the matching intermittent steam extraction process of the present invention are adopted. Among them, the length of the push-pull insulation shed 5 is set to about 135m; the exhaust pipes 3 are set to 10 and evenly arranged; the inner insulation layer 2 uses high-strength waterproof canvas as the base, coated with polyacrylic resin coating, which is doped with 10wt% aerogel and 20wt% air microspheres solid filler; the outer insulation layer 1 uses polyurethane insulation material with a thickness of 12cm.

[0058] The above-mentioned device and process can achieve the following effects: After testing, the site has achieved rapid drying of 135m long sludge strips in low temperature winter. In winter, the average moisture content can be reduced to 42%, which is 57% shorter than the simple film drying method, and the energy consumption of steam extraction equipment is reduced by about 65%; in summer, the average moisture content is reduced to about 40%, the required drying time is shortened by 45%, and the energy consumption of equipment is reduced by about 52%. Specific implementation method 2:

[0060] The device and process are used in a pig farm in the Central Plains region for the drying of local pig manure in spring and summer. The plant originally had a steam extraction and ventilation design, with multiple exhaust pipes 3 set above the plant, and multiple ventilation pipes on the ground. The outdoor ambient temperature of the plant is 12-25°C, the ambient humidity is higher than 55% for a long time, and the internal humidity is higher than 80% for a long time.

[0061] The pig manure strip-type biological drying system was improved and designed. The pig manure carbon-nitrogen ratio was tested to be 26, and the initial moisture content was 77.8%. The material strip was designed to be 2m high, 1.7m wide, and 24m long. The insulation shed was designed to be about 24m long based on the material length. The exhaust pipes 3 were set to 4 and evenly arranged. The design of the inner insulation layer 2 was the same as that of case 1, and the outer insulation layer 1 was not used.

[0062] The use of the above-mentioned device and process can achieve the following results: After testing, the site achieved efficient treatment of pig manure strips with a length of 24m, the average moisture content was reduced to about 40%, the required drying time was shortened by 51%, and the energy consumption of the equipment was reduced by about 57%.

[0063] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A low-temperature environment organic solid waste strip-type rapid biological drying energy-saving equipment, characterized by: It comprises a plurality of sections of push-pull insulation sheds (5), wherein a strip pile (4) is placed inside the shed body for aerobic fermentation, each section of the push-pull insulation shed (5) comprises an insulation shed body, an insulation layer, a plurality of exhaust pipes (3), a pulley (6) and an insulation curtain (7), the insulation shed body is provided with an insulation layer, a plurality of exhaust pipes (3) are provided on the side of the insulation shed body, a pulley (6) is provided at the bottom of the insulation shed body, and insulation curtains (7) are provided at both ends of the insulation shed body; in the internal area of ​​the push-pull insulation shed (5), a plurality of ventilation ducts are buried side by side on the surface of the site, and are opened regularly for oxygen supply; The thermal insulation layer comprises an outer thermal insulation layer (1) and an inner thermal insulation layer (2) or a single inner thermal insulation layer (2); the outer thermal insulation layer (1) is arranged on the outside of the inner thermal insulation layer (2); the inner thermal insulation layer (2) can be used alone in a warm environment, and can be used together with the outer thermal insulation layer (1) in a low temperature environment in winter; The inner thermal insulation layer (2) comprises a waterproof layer (9) and a thermal insulation coating (10); the thermal insulation coating (10) is installed between the outer thermal insulation layer (1) and the waterproof layer (9); and the waterproof layer (9) is a high-strength waterproof canvas; The thermal insulation coating (10) is an aerogel composite coating, wherein the coating is made of polyacrylic resin or silicone resin as a base coating, and SiO2 aerogel is compounded with hollow microspheres or polyurethane or TiO2, and the formula ratio is: base coating: aerogel: hollow microspheres: dispersant: thickener mass ratio = 60-80: 10-20: 10-20: 0.3: 0-0.5; The outer insulation layer (1) has a thickness of ≥5 cm and is made of polyurethane, rubber-plastic board or rock wool; The spacing between the multiple exhaust pipes (3) is 5 to 25 m, the pipe diameter is not less than 50 mm, and the exhaust pipes (3) are connected to a vacuum pump (8).

2. The low-temperature environment organic solid waste strip-type rapid biological drying energy-saving equipment according to claim 1 is characterized by: The thickness of the inner thermal insulation layer (2) is ≤2 cm.

3. The low-temperature environment organic solid waste strip-type rapid biological drying energy-saving equipment according to claim 1 is characterized by: The push-pull type heat preservation shed (5) further comprises a support rod (11), and the inner heat preservation layer (2) is arranged on the support rod (11) and fixed, and moves along with the support rod (11); the length of the push-pull type heat preservation shed (5) is designed according to the length of the strip stack (4), and the length of the strip stack (4) can be continuously extended, and the height is not less than 2m.

4. A drying method using the low-temperature environment organic solid waste strip-type rapid biological drying energy-saving equipment according to any one of claims 1 to 3, characterized in that: Including windrow aerobic fermentation and intermittent steam exhaust, 1. Strand-type aerobic fermentation, including the following steps: Step 1: pre-treat and dry the organic solid waste raw materials to make their moisture content no higher than 70%, and then stack them in the form of strips; Step 2: Push and pull the push-pull type heat preservation shed (5) to unfold it and place it on the strip pile (4); Step 3: according to the size and length of the strip pile (4), a hole is opened on one side of the push-pull type heat preservation shed (5), and a plurality of detachable exhaust pipes (3) are installed side by side. In the initial stage of aerobic fermentation of the raw materials, the exhaust pipes (3) are kept in a closed state to prevent heat loss; 2. Intermittent steam exhaust, including the following steps: Step 1: aerobically fermenting the strip pile (4) in a push-pull type heat preservation shed (5); Step 2: According to different environmental conditions, different frequencies of steam extraction and pile turning operations are performed. However, before steam extraction, the material temperature is required to be higher than 55° C. and remain stable. Then, the exhaust pipe (3) is opened, and the vacuum pump (8) is turned on to perform rapid steam exhaust for 10 to 60 minutes. The temperature of the strip pile (4) drops. At this time, the pile body temperature is required to be no lower than 45° C., which is conducive to subsequent rapid temperature increase. After that, the steam extraction is stopped, the exhaust pipe (3) is closed, and heat accumulation begins, and this cycle is repeated. Step 3: After 3 to 10 cycles of steam extraction, the compost is turned. In a severely cold environment, the number of times the compost is turned should be reduced to reduce heat loss. Before turning the compost, the outer insulation layer (1) is first folded up, and the push-pull insulation shed (5) is folded and stored by the pulley (6). When turning the compost, manual turning or mechanical turning is adopted, and finally the push-pull insulation shed (5) is unfolded, and the above steps are repeated until the moisture content of the material reaches the expected standard.

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