Honeycomb activated carbon steam desorption system

Abstract

The utility model relates to the technical field of organic waste gas treatment, in particular to a honeycomb activated carbon steam desorption system. The activated carbon desorption box is connected with a water vapor source through a steam inlet pipeline, and the activated carbon desorption box is connected with an inert gas source through an inert gas pipeline; a steam flow regulating valve, a steam flowmeter and a first temperature controller are sequentially arranged on the steam inlet pipeline in the direction from a steam source to the activated carbon desorption box, an inert gas switch valve is arranged on the inert gas pipeline, and a second temperature controller and a pressure controller are further arranged on the activated carbon desorption box. The steam flow regulating valve, the steam flow meter, the first temperature controller, the inert gas switch valve, the second temperature controller and the pressure controller are connected with the control module. Compared with desorption directly adopting water vapor, the activated carbon desorption device can effectively prevent activated carbon from catching fire.

Description

Technical Field

[0001] The utility model relates to the technical field of organic waste gas treatment, in particular to a honeycomb activated carbon steam desorption system. Background Art

[0002] At present, the honeycomb activated carbon on the market basically uses hot air for desorption, and the desorbed gas is processed through combustion equipment. However, there are several obvious problems with the hot air desorption of honeycomb activated carbon: First, the thermal conductivity of honeycomb activated carbon is small, the heat transfer is slow, the desorption cycle is long, and the concentration tailing phenomenon at the desorption outlet is obvious. Conventional hot air desorption has the problem of incomplete desorption, resulting in low reuse rate of activated carbon, rapid attenuation of efficiency and life span, which not only increases the difficulty of environmental protection management, but also increases the operation and maintenance costs of enterprises. Second, once the desorption conditions of hot air desorption are unreasonable and daily operation and maintenance cannot keep up, there will be oxidation and heat release problems of exhaust gas components in local areas of activated carbon, which will cause local heating of activated carbon and smoldering of fire. Safety accidents of honeycomb activated carbon fires occur every year in the industry.

[0003] There are also reports of activated carbon being desorbed using steam. The technology used is to directly introduce steam into the activated carbon desorption box at the beginning of desorption. However, this technology still carries the risk of activated carbon ignition. The main reason is that a large amount of air will be present in the activated carbon desorption box before desorption. Water vapor has a high calorific value. When water vapor is directly introduced at the beginning of desorption, the activated carbon will heat up rapidly. However, the water vapor cannot drive out all the air in the activated carbon desorption box in a short period of time. There is still air in some parts of the activated carbon desorption box. Under the conditions of high temperature, combustible organic matter, and air-supported combustion components, the activated carbon will smolder and catch fire. Utility Model Content

[0004] The utility model provides a honeycomb activated carbon steam desorption system, which aims to solve the safety hazards of activated carbon smoldering and ignition in existing steam desorption technologies by using inert gas for purging in advance and interlocking control of temperature, pressure and steam flow.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] The utility model provides a honeycomb activated carbon steam desorption system, comprising an activated carbon desorption box, a primary condenser, a secondary condenser and a solvent tank; the activated carbon desorption box is connected to the primary condenser via a pipeline, the primary condenser is connected to the secondary condenser via a pipeline, and the secondary condenser is connected to the solvent tank via a pipeline; the upper non-condensable gas exhaust port of the secondary condenser is connected to the original waste gas treatment system, and the non-condensable gas exhaust port of the solvent tank is connected to the original waste gas treatment system; the characteristics are:

[0007] The activated carbon desorption box is connected to the water vapor source through a steam inlet pipeline, and the activated carbon desorption box is connected to the inert gas source through an inert gas pipeline; a steam flow regulating valve, a steam flow meter and a temperature controller 1 are sequentially arranged on the steam inlet pipeline from the water vapor source to the activated carbon desorption box, an inert gas switch valve is arranged on the inert gas pipeline, and a temperature controller 2 and a pressure controller are also arranged on the activated carbon desorption box, and the steam flow regulating valve, steam flow meter, temperature controller 1, inert gas switch valve, temperature controller 2 and pressure controller are respectively connected to the control module.

[0008] Furthermore, the temperature in the activated carbon desorption box is 10-15° C. lower than the temperature in the steam inlet pipeline.

[0009] Furthermore, the temperature in the activated carbon desorption box is 12° C. lower than the temperature in the steam inlet pipeline.

[0010] Furthermore, the cumulative flow threshold of the steam flow meter is four hundred to six hundred times the volume of the honeycomb activated carbon in the activated carbon desorption box.

[0011] Furthermore, the cumulative flow threshold of the steam flow meter is four hundred and fifty times the volume of the honeycomb activated carbon in the activated carbon desorption box.

[0012] Furthermore, the activated carbon desorption box is provided with a safety valve.

[0013] Furthermore, the first-stage condenser adopts a shell and tube condenser, and the second-stage condenser adopts a shell and tube condenser or a spiral plate condenser.

[0014] The beneficial effects achieved by the utility model are:

[0015] Compared with the traditional hot air desorption of honeycomb activated carbon, the use of water vapor to desorb honeycomb activated carbon has the characteristics of short desorption time, higher desorption depth, long service life of activated carbon and high safety factor. In addition, the present application also has the following beneficial effects: 1. Before water vapor desorption, the activated carbon adsorption box is first purged with inert gas to remove the air in the box, and then water vapor is introduced for desorption. Compared with the direct use of water vapor desorption, it can effectively prevent the occurrence of activated carbon fire accidents; 2. The opening of the steam flow regulating valve is jointly controlled by the temperature on the steam inlet pipeline and the activated carbon adsorption box, which can achieve the best desorption effect and save steam flow; 3. The end of the desorption process is controlled by the cumulative flow of the steam flow meter, achieving the dual effects of complete desorption and saving steam flow, thereby achieving system energy saving; 4. A safety valve is installed on the activated carbon desorption box to increase system safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] In the figure, 1. Activated carbon desorption box; 2. Honeycomb activated carbon; 3. Primary condenser; 4. Secondary condenser; 5. Solvent tank; 6. Raw waste gas treatment system; 7. Steam flow regulating valve; 8. Steam flow meter; 9. Temperature controller 1; 10. Temperature controller 2; 11. Pressure controller; 12. Inert gas switch valve; 13. Safety valve. DETAILED DESCRIPTION

[0019] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] like Figure 1 As shown, the utility model provides a honeycomb activated carbon steam desorption system, comprising an activated carbon desorption box 1, a primary condenser 3, a secondary condenser 4 and a solvent tank 5, wherein the honeycomb activated carbon 2 to be desorbed is arranged in the activated carbon desorption box 1; the activated carbon desorption box 1 is connected to the primary condenser 3 through a pipeline, the primary condenser 3 is connected to the secondary condenser 4 through a pipeline, and the secondary condenser 4 is connected to the solvent tank 5 through a pipeline; the non-condensable gas exhaust port at the upper end of the secondary condenser 4 is connected to the original waste gas treatment system 6, and the non-condensable gas exhaust port of the solvent tank 5 is connected to the original waste gas treatment system 6;

[0023] The activated carbon desorption box 1 is connected to the water vapor source through a steam inlet pipeline, and the activated carbon desorption box 1 is connected to the inert gas source through an inert gas pipeline; a steam flow regulating valve 7, a steam flow meter 8 and a temperature controller 9 are sequentially arranged on the steam inlet pipeline from the water vapor source to the activated carbon desorption box 1, an inert gas switch valve 12 is arranged on the inert gas pipeline, and a temperature controller 2 10 and a pressure controller 11 are also arranged on the activated carbon desorption box 1, and the steam flow regulating valve 7, steam flow meter 8, temperature controller 19, inert gas switch valve 12, temperature controller 2 10 and pressure controller 11 are respectively connected to the control module.

[0024] Among them, the temperature controller 2 10 on the activated carbon desorption box 1 and the temperature controller 1 9 on the steam inlet pipeline are interlocked with the steam flow regulating valve 7 to dynamically adjust the opening of the steam flow regulating valve 7, so that the temperature in the activated carbon desorption box 1 is always within a reasonable range, preventing the temperature in the activated carbon desorption box 1 from exceeding the standard and causing a safety accident.

[0025] Furthermore, by controlling the steam flow, it is ensured that the temperature inside the activated carbon desorption box 1 (i.e., the temperature measured by the temperature controller 10) is 10-15°C lower than the temperature inside the steam inlet pipe (i.e., the temperature measured by the temperature controller 9), so that the steam flow reaches the optimal desorption flow, improving the effect while avoiding waste.

[0026] Furthermore, the temperature in the activated carbon desorption box 1 is 12° C. lower than the temperature in the steam inlet pipeline.

[0027] The steam flow regulating valve 7 is interlocked with the steam flow meter 8, and the switch of the steam flow regulating valve 7 is controlled according to the cumulative flow of the steam flow meter 8. When the cumulative flow of the steam flow meter 8 reaches the set value, the steam flow regulating valve 7 is closed to achieve the dual effects of complete desorption and saving steam flow, thereby realizing system energy saving.

[0028] Furthermore, the cumulative flow threshold of the steam flow meter 8 is: the cumulative flow value of the steam flow meter 8 (unit: kg) = the volume value of the honeycomb activated carbon 2 in the activated carbon desorption box 1 (unit: m 3 )×(400-600) times.

[0029] Preferably, the cumulative flow threshold of the steam flow meter 8 is: the cumulative flow value of the steam flow meter 8 (unit: kg) = the volume value of the honeycomb activated carbon 2 in the activated carbon desorption box 1 (unit: m 3 )×450 times.

[0030] The pressure controller 11 on the activated carbon desorption box 1 is interlocked with the steam flow regulating valve 7 for system safety protection. When the pressure in the activated carbon desorption box 1 exceeds the set value, the steam flow regulating valve 7 is closed.

[0031] Furthermore, the activated carbon desorption box 1 is provided with a safety valve 13. When the pressure in the activated carbon desorption box 1 exceeds the set pressure of the safety valve 13, the safety valve 13 trips to release the pressure.

[0032] Furthermore, the primary condenser 3 adopts a shell and tube condenser, and the secondary condenser 4 adopts a shell and tube condenser or a spiral plate condenser; since the primary condenser 3 and the secondary condenser 4 both adopt existing technologies, the specific arrangement will not be described in detail.

[0033] Furthermore, the control module includes a control chip, a display screen, and several control buttons. The control chip may be a PLC controller, a PAC controller, or a single-chip microcomputer. Based on the description herein, those skilled in the art can easily implement the software portion of the control module without requiring any creative effort, and thus the specific technical details are omitted.

[0034] Specifically, the steps of using the utility model are:

[0035] (1) After loading the activated carbon into the activated carbon desorption box 1, the system is started, and the control module controls the circulating water of the first-stage condenser 3 to be turned on, and controls the low-temperature water of the second-stage condenser 4 to be turned on.

[0036] (2) The control module controls the inert gas switch valve 12 to open and purge the activated carbon desorption box 1 to replace the air in the activated carbon desorption box 1. The inert gas purge time is 5-10 minutes.

[0037] (3) The control module controls the opening of the steam flow regulating valve 7 on the steam inlet pipeline, and jointly regulates the steam flow through the temperature controller 2 10 on the activated carbon desorption box 1 and the temperature controller 1 9 on the steam inlet pipeline. The value of the temperature controller 2 10 is controlled to be 10-15°C lower than the value of the temperature controller 9. This achieves the best desorption effect and saves steam flow. As the temperature of the activated carbon desorption box 1 increases, the desorbed waste gas components enter the primary condenser 3 and the secondary condenser 4 with the steam for condensation recovery. The recovered oil-water mixture enters the solvent tank 5. The non-condensable gas of the secondary condenser 4 re-enters the original waste gas treatment system 6 for re-adsorption treatment. The non-condensable gas of the solvent tank 5 re-enters the original waste gas treatment system 6 for re-adsorption treatment.

[0038] When the cumulative flow of the steam flow meter 8 reaches the set value, the steam flow regulating valve 7 is closed. The optimal value of the cumulative flow of the steam flow meter 8 is: the cumulative flow of the steam flow meter 8 (unit kg) = the volume of the honeycomb activated carbon 2 in the activated carbon desorption box 1 (unit m3) × (400-600) times.

[0039] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by utilizing the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A honeycomb activated carbon steam desorption system, comprising an activated carbon desorption box (1), a primary condenser (3), a secondary condenser (4) and a solvent tank (5); the activated carbon desorption box (1) is connected to the primary condenser (3) through a pipeline, the primary condenser (3) is connected to the secondary condenser (4) through a pipeline, and the secondary condenser (4) is connected to the solvent tank (5) through a pipeline; the upper end non-condensable gas exhaust port of the secondary condenser (4) is connected to the original waste gas treatment system (6), and the non-condensable gas exhaust port of the solvent tank (5) is connected to the original waste gas treatment system (6); characterized in that: The activated carbon desorption box (1) is connected to a water vapor source via a steam inlet pipeline, and the activated carbon desorption box (1) is connected to an inert gas source via an inert gas pipeline; a steam flow regulating valve (7), a steam flow meter (8) and a first temperature controller (9) are sequentially arranged on the steam inlet pipeline in a direction from the water vapor source to the activated carbon desorption box (1); an inert gas switch valve (12) is arranged on the inert gas pipeline; a second temperature controller (10) and a pressure controller (11) are also arranged on the activated carbon desorption box (1); the steam flow regulating valve (7), the steam flow meter (8), the first temperature controller (9), the first inert gas switch valve (12), the second temperature controller (10) and the pressure controller (11) are respectively connected to a control module.

2. The honeycomb activated carbon steam desorption system according to claim 1, characterized in that: The temperature in the activated carbon desorption box (1) is 10-15° C. lower than the temperature in the steam inlet pipeline.

3. The honeycomb activated carbon steam desorption system according to claim 2, characterized in that: The temperature in the activated carbon desorption box (1) is 12° C. lower than the temperature in the steam inlet pipeline.

4. The honeycomb activated carbon steam desorption system according to claim 1, characterized in that: The cumulative flow threshold of the steam flow meter (8) is four hundred to six hundred times the volume value of the honeycomb activated carbon (2) in the activated carbon desorption box (1).

5. The honeycomb activated carbon steam desorption system according to claim 4, characterized in that: The cumulative flow threshold of the steam flow meter (8) is four hundred and fifty times the volume value of the honeycomb activated carbon (2) in the activated carbon desorption box (1).

6. The honeycomb activated carbon steam desorption system according to claim 1, characterized in that: The activated carbon desorption box (1) is provided with a safety valve (13).

7. The honeycomb activated carbon steam desorption system according to claim 1, characterized in that: The first-stage condenser (3) adopts a shell and tube condenser, and the second-stage condenser (4) adopts a shell and tube condenser or a spiral plate condenser.

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