Direct combustion furnace

Abstract

The utility model provides a direct combustion furnace, and relates to the technical field of waste gas treatment. Specifically, the direct-fired furnace comprises a combustion chamber, a combustor, a rotational flow assembly and a shielding piece. Specifically, based on the fact that the shielding piece is arranged between the combustor and the rotational flow assembly and the waste gas inlet is formed in the connecting cylinder, under the condition that the direct combustion furnace operates, the shielding piece can be arranged between the waste gas entering from the gas inlet and flames provided by the combustor in a shielding mode, and the flames are protected and stabilized; moreover, on the basis, the shielding piece can also be matched with the rotational flow assembly to change the flowing direction of the waste gas in the connecting cylinder, so that the retention time of the waste gas in the combustion cylinder is prolonged, and the purification efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a direct-fired furnace. Background Art

[0002] The direct-fired furnace is a highly efficient organic waste gas treatment equipment, which is particularly suitable for treating large-volume, low-concentration VOCs waste gas. Its principle is to inject natural gas into the furnace, then ignite the natural gas, and let the flame directly burn the waste gas, so that the organic matter in the waste gas is burned and oxidized at high temperature and converted into harmless substances for emission.

[0003] However, during the operation of the equipment, since the air inlet of the equipment is directly opposite to the burner of the equipment, the burner flame is easily extinguished by the air intake, resulting in combustion interruption. In addition, in conventional designs, the residence time of the exhaust gas in the high-temperature section of the equipment is often extended by increasing the length of the equipment, resulting in the total length of the equipment being too long, occupying a large amount of on-site layout space. Utility Model Content

[0004] The utility model aims to provide a direct-fired furnace, which can protect the flame of the burner, plan the airflow path to extend the residence time of the airflow, and improve the purification efficiency.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a direct-fired furnace, including a combustion chamber, a burner, a swirl assembly, and a shielding member;

[0007] The combustion chamber comprises a first end and a second end which are arranged opposite to each other, and a connecting tube which connects the first end and the second end, wherein the first end is provided with a docking port, the second end is provided with an air outlet, and the connecting tube is provided with an air inlet;

[0008] The burner is arranged at the butt joint and is used to provide flame into the connecting tube;

[0009] The shielding member is arranged in the connecting tube and is located between the burner and the swirl assembly;

[0010] The swirl assembly is arranged in the connecting cylinder and communicated with the air outlet, and is used to make the airflow entering the connecting cylinder from the air inlet return to enter the shielding member, and guide the airflow discharged from the shielding member to be discharged through the air outlet.

[0011] Based on the above setting, the shielding member can be placed between the exhaust gas entering from the air inlet and the flame provided by the burner to protect and stabilize the flame; and it can also cooperate with the swirl component to change the flow direction of the exhaust gas in the connecting cylinder, thereby increasing the residence time of the exhaust gas in the combustion cylinder and increasing the purification efficiency.

[0012] In an optional embodiment, the swirl assembly includes a first ring, a second ring and a plurality of swirl blades, one end of any swirl blade is connected to the first ring and the other end is connected to the second ring, and the second ring is connected to the air outlet.

[0013] Based on the above arrangement, on the one hand, the swirl blades connected between the first ring and the second ring can guide the airflow back into the shielding member; on the other hand, the exhaust gas after combustion treatment can be discharged through the center of the first ring and the second ring in turn without obstruction.

[0014] In an optional embodiment, the first circular ring is coaxially arranged with the second circular ring, and the diameter of the first circular ring is smaller than the diameter of the second circular ring.

[0015] Based on the above arrangement, the swirl blades are arranged to be inclined toward the first circular ring, and the exhaust gas is focused into the shielding member close to the first circular ring, thereby improving the flow guidance efficiency and the flow guidance accuracy.

[0016] In an optional embodiment, the shielding member is in the shape of a cylinder with openings at both ends, and the shielding member, the first circular ring and the second circular ring are coaxially arranged.

[0017] Based on the above settings, the exhaust gas path specifications are further strengthened so that the exhaust gas can be discharged smoothly, avoiding the situation where the shielding member cannot correspond to the outlet due to the misalignment of the shielding member and the first ring, causing incompletely burned exhaust gas to escape, or fully burned exhaust gas to be retained.

[0018] In an optional embodiment, the center of the burner, the center of the shielding member, the center of the first circular ring, and the center of the second circular ring are all located on the axis of the connecting cylinder.

[0019] Based on the above arrangement, the internal space of the connecting tube is reasonably utilized, thereby achieving a uniform thermal field in the connecting tube and allowing untreated exhaust gas to enter the inner cavity of the shielding member at any point along the circumference of the shielding member, thereby increasing combustion efficiency.

[0020] In an optional embodiment, the diameter of the shielding member is greater than the diameter of the first circular ring.

[0021] Based on the above arrangement, the exhaust gas can directly enter the inner cavity of the shielding member without any obstruction or resistance. At the same time, the above size design also reduces the risk of blockage when the exhaust gas enters the shielding member, so that the exhaust gas guided by the first ring can be continuously input into the inner cavity of the shielding member.

[0022] In an optional embodiment, the swirl assembly further includes a support tube, and the second ring is connected to the second end via the support tube.

[0023] Based on the above arrangement, the support tube can not only stabilize the connection between the second ring and the second end while ensuring the conduction between the air outlet and the connecting tube, but also shorten the distance between the first ring and the shielding member to further standardize the airflow path.

[0024] In an optional embodiment, the air inlet is directly opposite to the shielding member.

[0025] Based on the above arrangement, the exhaust gas introduced from the air inlet is shielded by the shielding member and is unlikely to affect the flame provided by the burner.

[0026] In an optional embodiment, the diameter of the air inlet is smaller than the length of the shielding member.

[0027] Based on the above arrangement, the shielding member completely blocks the air inlet, increasing the proportion of exhaust gas that needs to be turned back.

[0028] In an optional embodiment, the axis of the connecting cylinder passes through the center of the docking port and the center of the gas outlet.

[0029] Based on the above arrangement, the flame and the air outlet provided by the burner are located on the axis of the connecting tube, so that the exhaust gas after the flame combustion will be directly discharged from the air outlet, thereby improving the exhaust efficiency.

[0030] The beneficial effects of the embodiments of the utility model include:

[0031] The present application provides a direct-fired furnace, which includes a combustion chamber, a burner, a swirl assembly, and a shielding member. Based on the shielding member being arranged between the burner and the swirl assembly, and based on the exhaust gas inlet being arranged on the connecting tube, when the direct-fired furnace is in operation, the shielding member can be placed between the exhaust gas entering from the inlet and the flame provided by the burner to protect and stabilize the flame; and on this basis, the shielding member can also cooperate with the swirl assembly to change the flow direction of the exhaust gas in the connecting tube, increase the residence time of the exhaust gas in the combustion tube, and increase the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the installation of a combustion chamber and a burner provided in an embodiment of the utility model;

[0034] Figure 2 A schematic diagram of a swirl assembly provided in an embodiment of the utility model;

[0035] Figure 3 This is a schematic diagram of a direct-fired furnace provided in an embodiment of the utility model.

[0036] Icons: 10-direct-fired furnace; 100-combustion chamber; 110-first end; 111-docking port; 130-second end; 131-air outlet; 150-connecting tube; 151-air inlet; 300-burner; 500-swirl assembly; 510-first ring; 530-second ring; 550-swirl blades; 570-support tube; 610-observation mirror; 630-support member; 700-shielding member; 810-shell; 820-inlet pipe; 830-outlet pipe; 850-insulation cotton; 860-explosion relief structure; 910-maintenance passage; 930-inspection passage; 950-rain cover. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] As mentioned in the background technology, in the prior art, on the one hand, the flame of the burner head of the direct-fired furnace is easily blown out, resulting in the problem of combustion interruption; on the other hand, since the residence time of the exhaust gas is often prolonged by increasing the length of the direct-fired furnace, the length of the equipment is too long and occupies a large space. In order to improve the above problems, the present application provides a direct-fired furnace, which can protect the flame of the burner by setting a shielding member and a swirl component, and plan the airflow path to extend the residence time of the airflow, thereby improving the purification efficiency.

[0044] See also Figure 1 , Figure 1 The installation diagram of the combustion chamber 100 and the burner 300 provided in the embodiment of the utility model is shown in FIG. Figure 1 The arrows shown in the figure indicate the direction of airflow. The present application provides a direct-fired furnace 10, which includes a combustion chamber 100, a burner 300, a swirl assembly 500, and a shielding member 700. The combustion chamber 100 includes a first end 110, a second end 130, and a connecting tube 150 connecting the first end 110 and the second end 130, and the first end 110 is provided with a docking port 111, the second end 130 is provided with an air outlet 131, and the connecting tube 150 is provided with an air inlet 151.

[0045] The burner 300 is arranged at the docking port 111, and is used to provide flame to the connecting cylinder 150; the shielding member 700 is arranged in the connecting cylinder 150 and is located between the burner 300 and the swirl assembly 500; the swirl assembly 500 is arranged in the connecting cylinder 150 and is connected to the air outlet 131, and is used to make the airflow entering the connecting cylinder 150 from the air inlet 151 return to enter the shielding member 700, and guide the airflow discharged from the shielding member 700 to be discharged at the air outlet 131.

[0046] Since the shielding member 700 is arranged between the burner 300 and the swirl assembly 500, and since the air inlet 151 of the exhaust gas is arranged on the connecting tube 150, when the direct-fired furnace 10 is running, the shielding member 700 can be blocked between the exhaust gas entering from the air inlet 151 and the flame provided by the burner 300 to protect and stabilize the flame; and, on this basis, the present application also adds a swirl assembly 500, which can cooperate with the shielding member 700 to change the flow direction of the exhaust gas in the connecting tube 150, thereby increasing the residence time of the exhaust gas in the combustion tube and increasing the purification efficiency.

[0047] Optionally, the axis of the connecting tube 150 passes through the center of the docking port 111 and the center of the air outlet 131. The above arrangement means that the flame provided by the burner 300 and the air outlet 131 are located on the axis of the connecting tube 150. Based on this, the exhaust gas after the flame combustion will be directly discharged from the air outlet 131, thereby improving the exhaust efficiency. In addition, no additional energy is required in this process, thereby reducing the energy loss in the exhaust process, improving the energy utilization efficiency of the direct-fired furnace 10, and reducing the energy loss and operating cost of the direct-fired furnace 10.

[0048] See also Figure 2 , Figure 2 Schematic diagram of the swirl assembly 500 provided in an embodiment of the utility model. The swirl assembly 500 includes a first circular ring 510, a second circular ring 530 and a plurality of swirl blades 550, one end of any swirl blade 550 is connected to the first circular ring 510, and the other end is connected to the second circular ring 530, and the second circular ring 530 is connected to the air outlet 131. On the one hand, the swirl blade 550 connected between the first circular ring 510 and the second circular ring 530 can guide the airflow to return to the shielding member 700; on the other hand, the exhaust gas after combustion treatment can be discharged through the center of the first circular ring 510 and the second circular ring 530 in sequence without being blocked.

[0049] Further, in order to stabilize the connection between the swirl assembly 500 and the second end 130, the swirl assembly 500 further includes a support tube 570, and the second ring 530 is connected to the second end 130 through the support tube 570. It can be understood that the support tube 570 can stabilize the connection between the second ring 530 and the second end 130 on the basis of ensuring that the air outlet 131 is connected to the connecting tube 150. Optionally, the support tube 570 is a steel section made of stainless steel 310S.

[0050] Furthermore, since one end of the support tube 570 is connected to the second end 130 and the other end is connected to the second ring 530 and extends in a direction close to the first end 110, it can shorten the distance between the first ring 510 and the shielding member 700, further standardize the airflow path, and prevent unburned exhaust gas from escaping.

[0051] Furthermore, in order to enhance the flow guiding function of the swirl assembly 500, the first ring 510 and the second ring 530 are coaxially arranged, and the diameter of the first ring 510 is smaller than the diameter of the second ring 530. Based on the above arrangement, the swirl blades 550 are inclined toward the first ring 510, and the exhaust gas is focused along the direction of CDE into the shielding member 700 close to the first ring 510, thereby improving the flow guiding efficiency and the accuracy of the flow guiding.

[0052] Please refer again Figure 1 , the shielding member 700 will be described in detail below. Optionally, in order to facilitate the cooperation between the shielding member 700 and the swirl assembly 500, the shielding member 700 is in the shape of a cylinder with openings at both ends, and the shielding member 700, the first circular ring 510 and the second circular ring 530 are coaxially arranged. Based on this, the exhaust gas path specification is further strengthened so that the exhaust gas can be discharged along the EF path, avoiding the shielding member 700 being unable to accurately correspond to the air outlet 131 due to the misalignment of the shielding member 700 and the first circular ring 510, resulting in the escape of incompletely burned exhaust gas, or the retention of fully burned exhaust gas.

[0053] Furthermore, in order to ensure that the airflow can be smoothly turned back and the airflow can extend a certain residence time, the diameter of the shielding member 700 is larger than the diameter of the first circular ring 510. Based on this, when the exhaust gas flows along the path of CDE, the exhaust gas can directly enter the inner cavity of the shielding member 700 without any blocking resistance. At the same time, the above-mentioned size design also reduces the risk of blockage when the exhaust gas enters the shielding member 700, so that the exhaust gas guided by the first circular ring 510 can be continuously input into the inner cavity of the shielding member 700.

[0054] Furthermore, in order to reasonably utilize the inner cavity space of the connecting cylinder 150, the center of the burner 300, the center of the shielding member 700, the center of the first ring 510 and the center of the second ring 530 are all located on the axis of the connecting cylinder 150. In other words, the burner 300, the shielding member 700 and the swirl assembly 500 are located on the same horizontal line (i.e., the axis of the connecting cylinder 150), thereby achieving a uniform thermal field in the connecting cylinder 150 and allowing untreated exhaust gas to enter the inner cavity of the shielding member 700 at any point along the circumference of the shielding member 700, thereby increasing the combustion efficiency. Specifically, as Figure 1 As shown, the exhaust gas may enter the shielding member 700 via the BCD path above or below the shielding member 700 .

[0055] In order to enhance the stability of the flame provided by the burner 300, the air inlet 151 is directly opposite to the shielding member 700. Based on this, the exhaust gas introduced by the air inlet 151 is shielded by the shielding member 700 and is unlikely to affect the flame provided by the burner 300. On this basis, in order to completely prevent the flame from being affected by the exhaust gas at the air inlet 151, the diameter of the air inlet 151 is smaller than the length of the shielding member 700. Based on this, the shielding member 700 completely shields the air inlet 151, so that all the exhaust gas entering from the air inlet 151 needs to move along the ABC path, that is, it will be deflected at B due to being blocked by the shielding member 700.

[0056] In addition, if Figure 1 As shown, the direct-fired furnace 10 also includes a support member 630 and an observation mirror 610. Among them, one end of the support member 630 is connected to the shielding member 700, and the other end is connected to the connecting tube 150, so as to stabilize the shielding member 700 and prevent the shielding member 700 from being suspended in the air at a position away from the first end 110. In addition, it should be noted that the support member 630 is made of stainless steel 310S, and is connected to the connecting tube 150 by bolts, leaving a certain thermal expansion margin to prevent the shielding member 700 from being thermally expanded and causing the connection strength to be reduced. The shielding member 700 is passed through one end of the observation mirror 610, and the connecting tube 150 is passed through the other end, so that the staff can observe the flame provided by the burner 300 and judge the exhaust gas treatment situation.

[0057] See also Figure 3 , Figure 3 Schematic diagram of a direct-fired furnace 10 provided by an embodiment of the utility model. The direct-fired furnace 10 also includes a shell 810, an air inlet pipe 820, an air outlet pipe 830 and heat insulation cotton 850, the combustion chamber 100 is located in the shell 810, the heat insulation cotton 850 is arranged on the inner wall of the shell 810, the air inlet pipe 820 sequentially passes through the shell 810 and the heat insulation cotton 850 and is connected to the air inlet 151, the air outlet pipe 830 sequentially passes through the shell 810 and the heat insulation cotton 850 and is connected to the air outlet 131, and the burner 300 sequentially passes through the shell 810 and the heat insulation cotton 850 and is connected to the docking port 111.

[0058] Based on the above configuration, large volume and low concentration organic waste gas enters the combustion chamber 100 through the air inlet pipe 820 for combustion treatment, and after treatment, clean gas is discharged through the air outlet pipe 830 to enter the next process. In the above process, the heat insulation cotton 850 can isolate the temperature inside and outside the shell 810, ensuring that the high temperature will not be transmitted to the outside through the shell 810 to cause burns to the staff.

[0059] In addition, in order to improve the safety of the direct-fired furnace 10 during operation, an explosion relief structure 860 is also provided on the top of the shell 810, which includes an angle steel frame connected to the shell 810 and an explosion relief diaphragm connected to the angle steel frame. Based on this, when the direct-fired furnace 10 is in an extreme situation, the internal pressure of the shell 810 increases rapidly, and the explosion relief diaphragm is opened to balance the air pressure inside and outside the shell 810 to prevent explosion.

[0060] Optionally, the direct-fired furnace 10 further includes a maintenance passage 910, a rain cover 950, and an inspection passage 930. The maintenance passage 910 includes a top guardrail and a straight ladder both connected to the shell 810, so as to ensure the personal safety of the maintenance personnel when they inspect the air inlet pipe 820; the rain cover 950 is connected to the shell 810 and is located above the burner 300 to prevent the direct-fired furnace 10 from being damaged by natural factors such as long-term sunlight or rainfall when it is running outdoors; one end of the inspection passage 930 is connected to the shell 810, and the other end is connected to the air outlet pipe 830, so that the staff can inspect the internal components when the direct-fired furnace 10 stops running.

[0061] Taking this embodiment as an example, the working principle and working process of the direct-fired furnace 10 provided in this application are as follows:

[0062] When the direct-fired furnace 10 is in operation, a large volume of low-concentration organic waste gas enters the connecting tube 150 through the air inlet pipe 820, is blocked by the shielding member 700, flows along the ABC path, and is deflected once at B; thereafter, the waste gas is guided by the swirl assembly 500 during the flow, and is deflected along the CDE path back to the inner cavity of the shielding member 700, thereby being burned by the burner 300; thereafter, the waste gas after the combustion treatment passes through the center of the swirl assembly 500 along the EF path, and is discharged from the air outlet pipe 830 to enter the next process.

[0063] In summary, the present application provides a direct-fired furnace 10, which includes a combustion chamber 100, a burner 300, a swirl assembly 500, and a shielding member 700. Based on the fact that the shielding member 700 is arranged between the burner 300 and the swirl assembly 500, and based on the fact that the air inlet 151 of the exhaust gas is arranged on the connecting tube 150, when the direct-fired furnace 10 is in operation, the shielding member 700 can block the exhaust gas entering from the air inlet 151 and the flame provided by the burner 300, thereby protecting and stabilizing the flame; and, on this basis, the shielding member 700 can also cooperate with the swirl assembly 500 to change the flow direction of the exhaust gas in the connecting tube 150, increase the residence time of the exhaust gas in the combustion tube, and increase the purification efficiency.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A direct-fired furnace, characterized in that: It comprises a combustion chamber (100), a burner (300), a swirl assembly (500) and a shielding member (700); The combustion chamber (100) comprises a first end (110), a second end (130) arranged opposite to each other, and a connecting tube (150) connecting the first end (110) and the second end (130), wherein the first end (110) is provided with a docking port (111), the second end (130) is provided with an air outlet (131), and the connecting tube (150) is provided with an air inlet (151); The burner (300) is disposed at the docking port (111) and is used to provide flame into the connecting cylinder (150); The shielding member (700) is disposed in the connecting cylinder (150) and is located between the burner (300) and the swirl assembly (500); The swirl assembly (500) is arranged in the connecting cylinder (150) and is connected to the air outlet (131), and is used to make the airflow entering the connecting cylinder (150) from the air inlet (151) return to enter the shielding member (700), and to guide the airflow discharged from the shielding member (700) to be discharged through the air outlet (131).

2. The direct-fired furnace according to claim 1, characterized in that: The swirl assembly (500) comprises a first circular ring (510), a second circular ring (530) and a plurality of swirl blades (550), one end of any one of the swirl blades (550) being connected to the first circular ring (510) and the other end being connected to the second circular ring (530), and the second circular ring (530) being in communication with the air outlet (131).

3. The direct-fired furnace according to claim 2, characterized in that: The first circular ring (510) and the second circular ring (530) are coaxially arranged, and the diameter of the first circular ring (510) is smaller than the diameter of the second circular ring (530).

4. The direct-fired furnace according to claim 2, characterized in that: The shielding member (700) is in the shape of a cylinder with openings at both ends, and the shielding member (700), the first circular ring (510) and the second circular ring (530) are coaxially arranged.

5. The direct-fired furnace according to claim 4, characterized in that: The center of the burner (300), the center of the shielding member (700), the center of the first circular ring (510), and the center of the second circular ring (530) are all located on the axis of the connecting tube (150).

6. The direct-fired furnace according to claim 4, characterized in that: The diameter of the shielding member (700) is greater than the diameter of the first circular ring (510).

7. The direct-fired furnace according to claim 2, characterized in that: The swirl assembly (500) further comprises a support tube (570), and the second ring (530) is connected to the second end (130) via the support tube (570).

8. The direct-fired furnace according to claim 1, characterized in that: The air inlet (151) is directly opposite to the shielding member (700).

9. The direct-fired furnace according to claim 8, characterized in that: The diameter of the air inlet (151) is smaller than the length of the shielding member (700).

10. The direct-fired furnace according to any one of claims 1 to 9, characterized in that: The axis of the connecting tube (150) passes through the center of the docking port (111) and the center of the air outlet (131).

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