Energy-saving condensation accompanying system for polluted gas heat distribution pipeline

Abstract

The utility model discloses an energy-saving condensation accompanying system for a polluted gas heat distribution pipeline, which is used for solving the problems of ground subsidence, substandard pipeline gradient, large temperature difference inside and outside the pipeline, high steam humidity and blockage of the heat distribution pipeline by condensed water in an in-situ thermal desorption process. By means of a double-variable-diameter structure, height difference design and pressure through balance, it is guaranteed that condensate water stably flows into a sealed water tank while secondary pollution is not caused, the working pressure of steam-water separation and condensation heat exchange of an SVE extraction fan is relieved through the condensation effect of a pipeline and the pre-condensation process by means of the natural environment temperature difference, and therefore energy is saved. The effects that water does not accumulate in the pipeline, pollution does not escape, and equipment condensation energy consumption is reduced are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the soil remediation technical field more specifically relates to a kind of for contaminated gas heat pipe energy-saving condensation accompanying system. BACKGROUND

[0002] With the development of environmental remediation technology, in-situ thermal desorption technology is applied in more and more scenarios. In-situ thermal desorption technology delivers heat energy to underground soil to promote the volatilization or decomposition of pollutants, which are then extracted to the ground pipeline through extraction wells and finally transported to the tail gas treatment equipment through the pipeline for complete treatment of the pollutants. As heating proceeds, the underground environment is usually heated to above 100℃, at which point the physicochemical properties of the soil change, and the ground also experiences uneven settlement. The high-temperature steam extracted to the delivery pipeline contains gaseous pollutants and a large amount of water vapor.

[0003] The conventional contaminated gas heat pipeline for in-situ thermal desorption has the following shortcomings:

[0004] (1) As heating proceeds at the thermal desorption site, the water content and physicochemical properties of the soil change, causing the ground to settle, the slope of the pipeline to be unable to be guaranteed, and water to accumulate severely at the low points of the pipeline, affecting the gas delivery effect;

[0005] (2) Generally, the in-situ thermal desorption heat pipeline is not provided with or is provided with a drain outlet only at the end. The condensate water stays in the pipeline for a long time, which has a certain corrosive effect on the pipeline and increases the steam saturation in the pipeline, the operating pressure of the SVE fan at the back end, and the working pressure of the steam-water separator and heat exchanger;

[0006] (3) The extraction pipeline for in-situ thermal desorption is a negative pressure pipeline. Influenced by the extraction equipment, the negative pressure is generally 10-40 kPa. At this level of pressure, the water at the drain node is hindered by the negative pressure, affecting the drain effect. In the negative pressure pipeline, the water falls by gravity and needs to overcome the pulling force caused by the negative pressure, wherein:

[0007] The pulling force caused by the negative pressure: F=PS

[0008] The gravity of the water in the drain vertical pipe: G=ρgSh

[0009] P is the negative pressure of the pipeline, in N / m 2 ; S is the cross-sectional area of the drain vertical pipe, in m 2 ; ρ is the density of the condensate, temporarily taken as 1000 kg / m 3 ; g is the acceleration of gravity, temporarily taken as 9.8 N / kg; and h is the length of the drain vertical pipe, in m.

[0010] When F is greater than G, the condensate cannot be effectively discharged due to the negative pressure, the minimum extraction pipeline pressure P = 10kPa is taken, h > 1m is obtained, and since the overall pipeline layout of the in-situ thermal desorption system does not have sufficient space to set a 1m long water drainage vertical pipe, the traditional water drainage structure cannot meet the water drainage demand of the thermal desorption negative pressure pipeline.

[0011] (4) Due to the presence of volatile pollutants in the gas and water body, the traditional heat pipe drainage device has the risk of secondary pollution, and cannot guarantee the sealing of the system and the drainage effect at the same time.

[0012] Generally, the extraction pipeline of in-situ thermal desorption does not take pipeline insulation measures, so a large amount of heat exchange occurs between the pipeline wall and the atmosphere, high-temperature steam condenses in the pipeline as the temperature decreases, and condensate containing pollutants is generated. The accumulation of condensate in the pipeline will cause pipeline blockage and corrosion, and will indirectly increase the load of the extraction equipment, affecting energy consumption and process effect. However, in the field of environmental remediation, the current in-situ thermal desorption technology standards or engineering cases do not have a clear way to deal with the problem of pipeline condensate accumulation.

[0013] In other industries, the pipeline slope and condensate collection device are usually set to reduce the influence of condensate on gas transmission effect. Due to the environmental protection property of environmental remediation activities, the in-situ thermal desorption heat pipe transports volatile pollutants that are high-risk to the environment, and the ordinary pipeline slope and drainage device cannot meet the requirements of secondary pollution prevention and control, so there is an urgent need for a method for solving the problem of condensate accumulation in the heat pipe of in-situ thermal desorption technology to ensure the extraction and tail gas treatment effect of in-situ thermal desorption technology implementation. Practical new type content

[0014] The present utility model aims at solving one of the above technical problems in the prior art at least to some extent.

[0015] To this end, one purpose of the present utility model is to provide a device system which solves the problem of water accumulation caused by pipeline settlement, difficulty in realizing pipeline slope and negative pressure hindrance without causing secondary pollution. Through the condensation effect of the pipeline itself, the condensate water is discharged in advance, and the energy consumption of the SVE heat exchange and condensation at the rear end is reduced. It is a pollution gas heat pipe condensation accompanying system which prevents settlement, prevents blockage, prevents escape, prevents leakage and saves energy.

[0016] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0017] An energy-saving condensation accompanying system for a pollution gas heat pipe, comprising:

[0018] The pollution gas heat pipe, the welded double variable diameter pipe, the condensation water vertical pipe, the condensation water pipeline, the condensation water collecting vertical pipe, the condensation water conveying pipeline, the sealed corrosion-proof water tank, the gas conveying pipeline, the high-temperature extraction equipment and the water conveying pipeline;

[0019] The pollution gas heat pipe is provided with a plurality of pipes and is connected through the welded double variable diameter pipe.

[0020] The welded double variable diameter pipe is connected with the condensation water vertical pipe and the condensation water pipeline, and the condensation water pipeline is arranged in parallel with the pollution gas heat pipe; the water outlet of the condensation water pipeline is connected with the condensation water collecting vertical pipe.

[0021] One end of the condensation water collecting vertical pipe is connected with the pollution gas heat pipe, and the other end is connected with the condensation water conveying pipeline.

[0022] The condensation water conveying pipeline is connected with the sealed corrosion-proof water tank.

[0023] The gas conveying pipeline is connected with the pollution gas heat pipe and is connected with the high-temperature extraction equipment.

[0024] The other end of the gas conveying pipeline is connected with the sealed corrosion-proof water tank.

[0025] Preferably, a ball valve one and a water flow indicator are arranged on the condensation water collecting vertical pipe.

[0026] Preferably, a butterfly valve one is arranged on the gas conveying pipeline.

[0027] Preferably, an air inlet pipeline is arranged on one side of the top of the sealed corrosion-proof water tank, and a ball valve two is arranged on the air inlet pipeline.

[0028] Preferably, a butterfly valve two, a water pump, a butterfly valve three and a check valve are arranged on the water conveying pipeline in sequence from the inlet to the outlet.

[0029] Preferably, the high-temperature extraction equipment is connected with an external tail gas treatment system.

[0030] The utility model discloses a structure, the condensate water is gathered in the pipeline low point formed by welding double variable diameter pipe structure to the pollution steam in pollution gas heat pipe, and the condensate water is flowed into the sealed anticorrosive water tank in the condensation accompanying pipe along with the water leakage vertical pipe under the action of gradient and gravity, and the water flow indicator can observe the water flow condition, and the ball valve controls the water flow to enter. In order to prevent the water and volatile organic compounds in the pipeline from escaping into the air to cause secondary pollution, the whole system needs to be sealed. But the pollution gas heat pipe is a negative pressure environment, in order to keep the pressure balance, ensure that the condensate water can overcome the negative pressure and enter the condensation accompanying pipe and the sealed anticorrosive water tank, the sealed anticorrosive water tank needs to be connected with the high-temperature extraction equipment to form a double-extraction system with the pollution gas heat pipe, so as to ensure the sealing and balance the system pressure. The pollution gas volatilized from the sealed anticorrosive water tank is transported to the high-temperature extraction equipment (SVE fan) through the gas pipeline and finally reaches the tail gas treatment system for treatment. When the condensate water in the sealed anticorrosive water tank accumulates to the set liquid level, the water pump is automatically started, the air inlet is opened, and the condensate water is discharged to the sewage treatment station for treatment.

[0031] Through the above technical scheme, compared with the prior art, the utility model has the following technical effects:

[0032] (1) The problem of water accumulation in the in-situ thermal desorption extraction pipeline is solved. Compared with the previous engineering experience, using this system, the condensate water accumulation and pipeline blockage no longer occur, the subsequent SVE fan gas-water separation and condensation heat exchange pressure are also reduced, and the heat exchange energy consumption is reduced.

[0033] (2) Through the double variable diameter structure and the laying density, the influence of the in-situ thermal desorption site settlement on the pipeline condensate water discharge is solved.

[0034] (3) Through the full-through connection mode, the pollution gas heat pipe, the sealed anticorrosive water tank and the high-temperature extraction equipment are connected, the internal pressure balance is maintained, the condensate water drainage effect is ensured, the system is sealed, the pollution gas is prevented from escaping, and secondary pollution is avoided.

[0035] (4) The condensation effect is advanced, the pressure of the rear-end equipment is reduced, and energy is saved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model, and other drawings can be obtained by the provided drawings without creative labor for the person skilled in the art.

[0037] Figure 1 The utility model provides a condensation accompanying system schematic diagram;

[0038] Figure 2 The condensation accompanying system structure diagram provided by the utility model;

[0039] In the figure,

[0040] 1. Pollution gas heat pipe; 2. Welding double reducing pipe; 3. Condensation accompanying drain vertical pipe; 4. Condensation accompanying pipe; 51. Ball valve one; 52. Ball valve two; 6. Water flow indicator; 7. Sealed corrosion-proof water tank; 81. Butterfly valve one; 82. Butterfly valve two; 83. Butterfly valve three; 9. Gas conveying pipe; 10. High-temperature extraction equipment; 11. Water conveying pipe; 12. Water pump; 13. Check valve; 14. Condensate water collecting vertical pipe; 15. Condensate water conveying pipe; 16. Air inlet pipe; 17. Pipe support. DETAILED DESCRIPTION

[0041] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0042] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0043] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0044] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "on", "above" and "over" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0046] Embodiment 1

[0047] The present embodiment provides a kind of energy-saving condensing accompanying system for contaminated gas heat pipe, comprising:

[0048] Contaminated gas heat pipe 1, welding double reducing pipe 2, condensing accompanying drain vertical pipe 3, condensing accompanying pipe 4, condensing water collection vertical pipe 14, condensing water delivery pipe 15, sealed anticorrosive water tank 7, gas pipeline 9, high-temperature extraction equipment 10 and water pipeline 11;

[0049] Wherein, contaminated gas heat pipe 1 is provided with several roots, and is connected by welding double reducing pipe 2;

[0050] Welding double reducing pipe 2 is connected with condensing accompanying pipe 4 by condensing accompanying drain vertical pipe 3, and condensing accompanying pipe 4 is arranged in parallel with contaminated gas heat pipe 1;The water outlet of condensing accompanying pipe 4 is connected with condensing water collection vertical pipe 14;

[0051] One end of condensing water collection vertical pipe 14 is connected with contaminated gas heat pipe 1, and the other end is connected with condensing water delivery pipe 15;

[0052] Condensing water delivery pipe 15 is connected with sealed anticorrosive water tank 7;

[0053] Gas pipeline 9 is summarized with contaminated gas heat pipe 1 and is connected with high-temperature extraction equipment 10;

[0054] The other end of gas pipeline 9 is connected with sealed anticorrosive water tank 7;

[0055] Sealed anticorrosive water tank 7 is connected with external sewage treatment system by water pipeline 11;

[0056] Ball valve one 51 and water flow indicator 6 are arranged on condensing water collection vertical pipe 14;

[0057] Butterfly valve one 81 is arranged on gas pipeline 9.

[0058] The air inlet pipeline 16 is provided with a ball valve 52.

[0059] The butterfly valve two 82, the water pump 12, the butterfly valve three 83 and the check valve 13 are sequentially arranged on the water conveying pipeline 11 from the inlet to the outlet.

[0060] The high-temperature extraction equipment 10 is connected with an external tail gas treatment system.

[0061] Embodiment 2

[0062] The basic working process of the utility model is as follows:

[0063] ① During the construction of the extraction pipeline, a set of welded double variable-diameter pipes is installed every 12 m, and the condensing system is installed according to the Figure 2 middle mode;

[0064] ② After the thermal desorption operation, the condensate water enters the sealed corrosion-resistant water tank along the pipeline, and the volatile organic pollutants in the water enter the extraction fan;

[0065] ③ When the water reaches the specified liquid level, the water pump is started, the water in this batch is discharged, and then the water pump stops working;

[0066] ④ After the next batch of water is collected, the next discharge is started;

[0067] This system serves the in-situ thermal desorption process, and needs to be kept running during the operation of the in-situ thermal desorption process.

[0068] The working principle is as follows: in the in-situ thermal desorption process, heat is injected into the soil, and the organic pollutants and water in the soil form toxic high-temperature steam under heating, which is then extracted by the extraction well to the contaminated gas heat pipeline 1. Because there is a temperature difference between the inside and outside of the contaminated gas heat pipeline 1, the high-temperature steam condenses when it encounters cold in the pipeline, forming condensate water. Under the action of gravity, the condensate water flows into the condensing accompanying pipeline 4 through the condensing accompanying drain vertical pipe 3, and the sealed corrosion-resistant water tank 7 and the contaminated gas heat pipeline 1 are kept in pressure balance by using the principle of communicating vessels, so as to avoid the reverse suction phenomenon of the condensing accompanying vertical pipe 4 and affect the discharge of the condensate water. By using the natural environmental temperature difference and the condensing effect of the pipeline itself, the condensate water is discharged in advance, the pressure of the steam-water separation and condensing heat exchange of the SVE extraction fan (high-temperature extraction equipment 10) is reduced, and the purpose of saving energy is achieved. By increasing the density of the drain nodes and using the height difference between the contaminated gas heat pipeline 1 and the condensing accompanying pipeline 4, even if the ground settlement occurs and the one-way slope of the contaminated gas heat pipeline 1 cannot be guaranteed, the condensate water will flow to the nearest drain node and then enter the condensing accompanying pipeline 4. Through the gravity of the water accumulation in the condensate water collecting vertical pipe 14, the condensate water flows into the sealed corrosion-resistant water tank 7, so that the condensate water does not cause water accumulation in the contaminated gas heat pipeline 1 in the case of ground settlement.

[0069] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the present specification.

[0070] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A system for energy-saving condensation accompanying a contaminated gas heat pipe, characterized in that, The utility model relates to a kind of pollution gas heat pipe, welded double reducing pipe, condensation accompanying drain vertical pipe, condensation accompanying pipe, condensation water collection vertical pipe, condensation water conveying pipe, sealed anticorrosive water tank, gas pipeline, high-temperature extraction equipment and water pipeline; Wherein, the pollution gas heat pipe is provided with several roots, and is connected by the welded double reducing pipe; The welded double reducing pipe is connected with the condensation accompanying pipe by the condensation accompanying drain vertical pipe, and the condensation accompanying pipe is arranged in parallel with the pollution gas heat pipe;The water outlet of the condensation accompanying pipe is connected with the condensation water collection vertical pipe; One end of the condensation water collection vertical pipe is connected with the pollution gas heat pipe, and the other end is connected with the condensation water conveying pipe; The condensation water conveying pipe is connected with the sealed anticorrosive water tank; The gas pipeline is connected with the pollution gas heat pipe and the high-temperature extraction equipment; The other end of the gas pipeline is connected with the sealed anticorrosive water tank. Ball valve one and water flow indicator are arranged on the condensation water collection vertical pipe.

2. The energy-saving condensing system for the contaminated gas heat-pipe line according to claim 1, characterized in that, Butterfly valve one is arranged on the gas pipeline.

3. The energy-saving condensing and accompanying system for the contaminated gas heat pipe according to claim 2, characterized in that, Air inlet pipeline is arranged on one side of the top of the sealed anticorrosive water tank, and ball valve two is arranged on the air inlet pipeline.

4. The energy-saving condensing system for the contaminated gas heat-pipe line according to claim 3, characterized in that, Butterfly valve two, water pump, butterfly valve three and check valve are arranged on the water pipeline from inlet to outlet.

5. The energy-saving condensing and accompanying system for the contaminated gas heat pipe according to claim 4, characterized in that, The high-temperature extraction equipment is connected with external tail gas treatment system.

6. The energy-saving condensing and accompanying system for the contaminated gas heat pipe according to claim 5, characterized in that, ​

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