Waste heat recovery device for straw steam explosion wall breaking and waste heat recovery method thereof

Abstract

The invention discloses a waste heat recovery device and a waste heat recovery method of a straw steam explosion wall, and relates to the technical field of waste heat recovery of the steam explosion wall. The waste heat recovery device of the straw steam explosion wall comprises a steam explosion tank and a material receiving device, and a discharging port of the steam explosion tank is communicated with a feeding port of the material receiving device; a steam outlet of the material receiving device is communicated with the settling chamber through a first pipeline, and a steam outlet of the settling chamber is communicated with the heat exchanger through a second pipeline. Straw in steam can be removed through the settling chamber, then the steam is cooled through the heat exchanger, cooled gas is discharged into air, heat lost by the steam in the heat exchanger can be absorbed and applied by another heat exchange medium in the heat exchanger, and therefore waste heat recovery of the steam explosion wall of the straw is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery from steam explosion wall breaking, and in particular to a waste heat recovery device for straw steam explosion wall breaking and a waste heat recovery method. Background Art

[0002] Steam explosion is recognized by agricultural experts as the most efficient straw feed processing method. The specific process is as follows: the crushed and impurity-removed straw is placed in a steam explosion tank, and high-temperature and high-pressure steam is introduced. At a certain pressure and temperature, it is maintained for a certain period of time. The high-temperature and high-pressure steam penetrates into the interior of the straw, various pathogens are killed, and pesticide residues are decomposed. Then the release port of the steam explosion tank is instantly opened, and the straw is ejected into the collecting device through the pipeline along with the high-temperature and high-pressure steam. In the above process, the high-pressure steam that penetrates into the interior of the straw expands and does work, destroying the microstructure of the straw, separating the fiber, hemi-fiber and lignin of the straw, breaking some chemical bonds, and greatly increasing the non-fibrous carbohydrate content and relative feed value of the straw that has been steam-exploded.

[0003] like Figure 1 As shown, the process of the existing straw steam explosion wall breaking technology is as follows: steam and straw are ejected from the steam explosion tank and enter the material collecting device through the pipeline, the straw is intercepted in the material collecting device, and the steam mixed with a small amount of straw is discharged into the atmosphere. The waste heat of the steam in the prior art is not utilized, and the straw mixed in the steam pollutes the factory environment and needs to be cleaned frequently.

[0004] Therefore, there is an urgent need in the art for a waste heat recovery device and a waste heat recovery method for straw steam explosion wall breaking to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a waste heat recovery device and a waste heat recovery method for straw steam explosion wall breaking to solve the problems existing in the above-mentioned prior art, which can realize the waste heat recovery of straw steam explosion wall breaking, and the straw can also be settled without polluting the environment.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The invention discloses a waste heat recovery device for straw steam explosion wall breaking, comprising a steam explosion tank and a material receiving device, wherein the material outlet of the steam explosion tank is connected with the material feed port of the material receiving device, the steam outlet of the material receiving device is connected with a sedimentation chamber through a first pipeline, and the steam outlet of the sedimentation chamber is connected with a heat exchanger through a second pipeline.

[0008] Preferably, a fan is provided on the second pipeline.

[0009] Preferably, a filter is provided on the second pipeline.

[0010] Preferably, the settling chamber comprises a chamber body, and a chamber steam inlet and a chamber steam outlet are provided on the side wall of the chamber body, the chamber steam inlet is used to connect to the first pipeline, and the chamber steam outlet is used to connect to the second pipeline.

[0011] Preferably, a plurality of partition walls are provided in the chamber body.

[0012] Preferably, a release window is provided on a side wall of the chamber body away from the chamber steam outlet.

[0013] Preferably, the chamber body is a reinforced concrete structure, and a cement mortar layer and a waterproof layer are provided on the inner wall of the chamber body.

[0014] Preferably, the inner floor of the chamber body has a slope, and a floor drain is provided on the inner floor of the chamber body.

[0015] The invention discloses a waste heat recovery method of straw steam explosion wall breaking, comprising the following steps:

[0016] S1. Put the crushed and impurity-removed straw into a steam explosion tank, introduce steam, and maintain it at a set pressure and temperature for a set time;

[0017] S2, then instantly open the discharge port of the steam explosion tank, and the straw is ejected along with the steam and enters the collecting device;

[0018] S3, the straw is intercepted in the collecting device, and the steam mixed with the straw enters the settling chamber through the first pipeline;

[0019] S4. The steam entering the settling chamber is turned back through the partition wall and sucked out by the fan. The extracted steam then passes through the filter and enters the heat exchanger, transfers the heat to the heat exchange medium, and then flows out.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The present invention can remove straw from steam through a settling chamber, thereby solving the environmental pollution problem caused by steam entraining straw, and then cool it using a heat exchanger, and then discharge the cooled gas into the air. The heat lost by the steam in the heat exchanger can be absorbed and used by another heat exchange medium in the heat exchanger, thereby realizing the waste heat recovery of the straw steam explosion wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is the flow chart of the existing steam explosion wall breaking equipment;

[0024] Figure 2 It is a flow chart of a waste heat recovery device for straw steam explosion wall breaking according to an embodiment of the present invention;

[0025] Figure 3 This is an internal structural diagram of a settling chamber in a waste heat recovery device for steam explosion wall breaking of straw according to an embodiment of the present invention;

[0026] In the figure: 1-steam explosion tank; 2-material collecting device; 3-sedimentation chamber; 301-chamber body; 302-chamber steam inlet; 303-partition wall; 304-release window; 305-chamber steam outlet; 4-fan; 5-filter; 6-heat exchanger. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a waste heat recovery device and a waste heat recovery method for straw steam explosion wall breaking to solve the problems existing in the above-mentioned prior art, which can realize the waste heat recovery of straw steam explosion wall breaking, and the straw can also be settled without polluting the environment.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 2-Figure 3 As shown, this embodiment provides a waste heat recovery device for steam explosion wall breaking of straw, including a steam explosion tank 1 and a material receiving device 2, wherein the material outlet of the steam explosion tank 1 is connected to the material inlet of the material receiving device 2. In order to further realize the waste heat recovery of steam explosion wall breaking, the steam outlet of the material receiving device 2 is connected to the settling chamber 3 through a first pipeline, and the settling chamber 3 is used to settle the straw in the steam, and the steam outlet of the settling chamber 3 is connected to the heat exchanger 6 through a second pipeline, and the heat exchanger 6 is the prior art, wherein two heat exchange media are introduced, one of which is the steam from the settling chamber 3, and the other can be selected from the existing low-temperature water or low-temperature air, and the steam can transfer heat to the low-temperature water or low-temperature air at the heat exchanger 6, and the low-temperature water or low-temperature air is converted into high-temperature water or high-temperature air, wherein the high-temperature water can be used for heating, and can also be used for preheating the softened water of the boiler, and the high-temperature air can be used for heating.

[0031] In actual use, the crushed and impurity-removed straw is placed in the steam explosion tank 1, and high-temperature and high-pressure steam is introduced into the steam explosion tank 1 at the same time, and maintained at a certain pressure and temperature for a certain time. Then the straw and steam in the steam explosion tank will enter the material receiving device 2 together through the pipeline, and complete the gas-solid separation at the material receiving device 2, most of the straw will be collected at the material receiving device 2, and the steam will flow out. The outflowing steam will enter the sedimentation chamber 3 through the first pipeline, in the sedimentation chamber 3, the straw in the steam will settle due to its own weight and be located at the bottom of the sedimentation chamber 3, and the steam will flow out from the sedimentation chamber 3 through the second pipeline into the heat exchanger 6, providing heat for another heat exchange medium in the heat exchanger 6, thereby realizing the waste heat recovery effect of the straw steam explosion wall breaking, and the steam after heat exchange will cool down and be converted into water, and enter the high-temperature air together with the steam and be converted into air at a lower temperature after passing through the heat exchanger 6, and then the water and normal temperature air can be transported out together.

[0032] In this embodiment, a fan 4 is provided on the second pipeline, and the fan 4 provides power for steam transportation, so that the steam can be extracted and transported to the heat exchanger 6 .

[0033] In this embodiment, a filter 5 is provided on the second pipeline, and the filter 5 can be arranged at a position before or after the fan 4. Figure 2 The filter 5 is closer to the heat exchanger 6 than the fan 4. The filter 5 may include but is not limited to an existing steam filter 5, which is used to remove some impurities in the steam, improve the purity of the steam, and reduce the impact on the heat exchange efficiency of the heat exchanger 6.

[0034] In this embodiment, the sedimentation chamber 3 includes a chamber body 301, which is a rectangular chamber structure. A chamber steam inlet 302 and a chamber steam outlet 305 are provided on the side wall of the chamber body 301, wherein the chamber steam inlet 302 is used to connect to the first pipeline, and the chamber steam outlet 305 is used to connect to the second pipeline.

[0035] In this embodiment, if Figure 3 As shown, a plurality of partition walls 303 are provided in the chamber body 301. There are two or more partition walls 303, which can be arranged at intervals up and down. The partition walls 303 can increase the steam path and hinder the straw in the steam, thereby improving the straw settling efficiency. In addition, more steam can be collected, reducing the amount of steam discharged from the release window 304 of the chamber body 301.

[0036] In this embodiment, a release window 304 is provided on one side wall of the chamber body 301 away from the chamber steam outlet 305. The purpose of providing the release window 304 is to prevent the steam from entering the chamber body 301 in an instant, which may cause excessive pressure in the chamber body 301 and cause danger. At the same time, as the steam enters, the release window 304 is always completely open, and the area of ​​the window is large enough, so that the original air in the settling chamber will be pushed out by the steam from the release window 304. Of course, some steam will flow out of the release window 304 during this process, causing losses, but these are small parts of steam, so the losses will not be very large.

[0037] In this embodiment, the chamber body 301 is a reinforced concrete structure, so that it can withstand a certain air pressure shock. In addition, a cement mortar layer and a waterproof layer are provided on the inner wall of the chamber body 301, that is, the walls and the floor of the chamber body 301 made of reinforced concrete are plastered with cement mortar and waterproofed, so that the chamber body 301 has moisture and corrosion resistance.

[0038] In addition, the total volume in the chamber body 301 should be greater than the product of the volume of a single steam explosion tank 1 and the absolute pressure in the steam explosion tank 1 .

[0039] In this embodiment, the inner floor of the chamber body 301 has a slope, and a floor drain is provided on the inner floor of the chamber body 301, and the accumulated water in the chamber body 301 can flow along the slope to the floor drain and flow out from the floor drain. When the steam enters the settling chamber 3, part of the steam will condense, and the condensed water will flow downward and flow to the ground, and finally flow from the ground of the chamber body 301 to the floor drain, thereby avoiding the accumulation of condensed water at the bottom of the settling chamber 3.

[0040] In this embodiment, the receiving device 2 includes an existing cyclone dust collector, which is provided with a receiving bin at the lower end and a steam outlet at the upper end, the steam outlet being connected to the settling chamber 3 through a first pipeline, and a discharging device is also provided at the outlet at the lower end of the receiving bin, the discharging device includes a discharging drive (i.e., a motor and a reducer, the output shaft of the motor is connected to the input shaft of the reducer), and a push slurry plate is connected to the output shaft of the discharging drive (i.e., the output shaft of the reducer), and when the discharging drive is started, the push slurry plate can be driven to rotate, thereby pushing the material at the bottom of the receiving bin to be discharged from the outlet at the bottom of the receiving bin. As for the specific structure of the cyclone dust collector, since it is a prior art, its structure will not be described in detail here.

[0041] Embodiment 2

[0042] This embodiment provides a method for recovering waste heat from steam explosion of straw wall, based on the waste heat recovery device for steam explosion of straw wall disclosed in the first embodiment, comprising the following steps:

[0043] S1. Put the crushed and impurity-removed straw into a steam explosion tank 1, and introduce high-temperature and high-pressure steam. Maintain the set pressure and temperature for a set time. The specific pressure, temperature and time can be appropriately adjusted according to actual needs and are not limited here.

[0044] S2. Then, the discharge port of the steam explosion tank 1 is opened instantaneously, and the straw is ejected along with the high-temperature and high-pressure steam and enters the collecting device 2.

[0045] S3, the straw is intercepted in the collecting device 2, and the steam mixed with a small amount of straw enters the settling chamber 3 through the first pipeline. The settling chamber 3 is in the shape of a rectangular cavity with several partition walls 303 inside. The steam entering the settling chamber 3 needs to pass through a longer channel before it can be discharged from the release window 304 of the settling chamber 3.

[0046] S4. The steam entering the settling chamber 3 is turned back through the partition wall 303 and sucked out by the fan 4. Most of the straw in the sucked out steam has been removed by sedimentation. The extracted steam passes through the filter 5 and enters the heat exchanger 6 to transfer the heat to the heat exchange medium, and then flows out. Specifically, the steam can transfer its heat to low-temperature water or low-temperature air. The hot water after absorbing heat can be used for heating, and can also be used to preheat boiler softening water; the hot air after absorbing heat is used for heating. The steam entering the heat exchanger 6 is condensed into water and discharged from the heat exchanger 6, and the air entering the heat exchanger 6 with the steam is also cooled. Most of the straw entrained in the steam entering the settling chamber 3 settles on the ground of the settling chamber 3, solving the environmental pollution problem caused by steam entrainment, and the straw settled on the ground of the settling chamber 3 only needs to be manually cleaned regularly.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A waste heat recovery device for steam explosion wall breaking of straw, comprising a steam explosion tank and a material receiving device, wherein the discharge port of the steam explosion tank is connected to the feed port of the material receiving device, and characterized in that: The steam outlet of the material receiving device is connected to the settling chamber through a first pipeline, and the steam outlet of the settling chamber is connected to the heat exchanger through a second pipeline.

2. The waste heat recovery device for straw steam explosion wall breaking according to claim 1 is characterized by: The second pipeline is provided with a fan.

3. The waste heat recovery device for straw steam explosion wall breaking according to claim 1 is characterized by: The second pipeline is provided with a filter.

4. The waste heat recovery device for straw steam explosion wall breaking according to claim 1 is characterized by: The settling chamber comprises a chamber body, and a chamber steam inlet and a chamber steam outlet are provided on the side wall of the chamber body. The chamber steam inlet is used to connect to the first pipeline, and the chamber steam outlet is used to connect to the second pipeline.

5. The waste heat recovery device for straw steam explosion wall breaking according to claim 4 is characterized by: A plurality of partition walls are arranged in the chamber body.

6. The waste heat recovery device for straw steam explosion wall breaking according to claim 4 is characterized by: A release window is provided on a side wall of the chamber body away from the chamber steam outlet.

7. The waste heat recovery device for straw steam explosion wall breaking according to claim 4 is characterized by: The chamber body is a reinforced concrete structure, and a cement mortar layer and a waterproof layer are provided on the inner wall of the chamber body.

8. The waste heat recovery device for straw steam explosion wall breaking according to claim 4 is characterized by: The inner floor of the chamber body has a slope, and a floor drain is arranged on the inner floor of the chamber body.

9. A method for recovering waste heat from straw steam explosion wall breaking, characterized in that: The waste heat recovery device for breaking the wall by steam explosion of straw according to any one of claims 1 to 8 comprises the following steps: S1. Put the crushed and impurity-removed straw into a steam explosion tank, introduce steam, and maintain it at a set pressure and temperature for a set time; S2, then instantly open the discharge port of the steam explosion tank, and the straw is ejected along with the steam and enters the collecting device; S3, the straw is intercepted in the collecting device, and the steam mixed with the straw enters the settling chamber through the first pipeline; S4. The steam entering the settling chamber is turned back through the partition wall and sucked out by the fan. The extracted steam then passes through the filter and enters the heat exchanger, transfers the heat to the heat exchange medium, and then flows out.

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