CN210701673U - Positive pressure heat regeneration type natural gas soil heating repair system - Google Patents
Positive pressure heat regeneration type natural gas soil heating repair system Download PDFInfo
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- CN210701673U CN210701673U CN201921718186.9U CN201921718186U CN210701673U CN 210701673 U CN210701673 U CN 210701673U CN 201921718186 U CN201921718186 U CN 201921718186U CN 210701673 U CN210701673 U CN 210701673U
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Abstract
The utility model discloses a malleation backheating type natural gas soil heating repair system, the system include the burner, with, the heating well that the burner is connected, air compressor, ejector and heat exchanger, exhaust tail gas in the heating well with exhaust compressed air is connected with the heat exchanger respectively in the air compressor, and the air admission ejector entry after carrying out heat exchange through the heat exchanger, the natural gas of input is connected as the drainage pipeline of drawing fluid and ejector, the export of ejector and the access connection of burner. Adopt and draw and penetrate mixed type combustor and malleation and strengthen heat transfer heater well, compress the air before getting into the combustor and utilize heater well tail gas energy to preheat, improve the air temperature, the utility model discloses effectively utilized in the original scheme because directly discharge tail gas and dumped waste heat energy, with this partial energy through the air bring back the system once more, do not need the suction of fan, settled the fan behind the heater well in having got rid of traditional system, saved the energy.
Description
Technical Field
The utility model relates to a soil restoration technical field, concretely relates to malleation backheating type natural gas soil heating repair system can realize energy-conservation and improve tail gas temperature and pressure purpose.
Background
The problem of soil pollution is receiving increasing attention as a problem that restricts sustainable development of human society. The research on the remediation technology of the polluted soil becomes a new hotspot of the current environmental protection engineering science and technology research. The treatment of soil pollution usually has two forms of ectopic remediation and in-situ remediation. The ex-situ remediation relates to soil excavation and soil transportation, seriously damages the soil structure, has higher cost and is not suitable for treating deep pollution and pollution under buildings. The soil in-situ remediation technology is a soil remediation technology for directly remediating contaminated soil in a contaminated site without excavation, has the characteristics of low investment, capability of saving remediation cost, no need of excavation and transportation of contaminated soil, and small influence on the surrounding environment, and is a research hotspot for soil remediation. Soil remediation by heating is a mature and effective in-situ soil remediation technology, and the contaminated medium and the contaminants contained in the soil are heated to boiling temperature by direct or indirect heat exchange, so that the contaminated medium and the contaminants are volatilized, separated or cracked.
The soil heating and repairing system generally uses fossil energy as an energy source, and a natural gas soil heating and repairing system is a common system. Fossil energy is an extremely important resource on earth, and the full utilization and effective conservation of fossil energy are challenges for various disciplines taking energy as a core and a starting point. For systems that heat soil for remediation, the energy required to heat the contaminants in the soil to boiling point is significant. The in-situ heating process is generally divided into two stages of low temperature (100-350 ℃) and high temperature (350-600 ℃). Among them, thermal desorption is the main mechanism for removing pollutants in the low-temperature stage, and pyrolysis is the main mechanism for removing pollutants in the high-temperature stage. Numerous studies have shown that the temperature significantly affects the thermal desorption process of organic substances, and lower heating temperatures are not favorable for removing pollutants. The energy generated by the consumption of fossil energy cannot be completely used for heating the soil, and most of the energy is directly lost along with the emission of high-temperature tail gas into the environment, so that the heating efficiency of the whole system becomes low.
As shown in fig. 5, in the conventional natural gas soil heating and remediation system, natural gas and air are directly introduced into the burners connected in parallel for combustion, and the tail gas passes through the respective heating wells connected to the burners to transfer heat to the soil. The tail gas that each heater well discharged is collected together through tail gas pipe network, produces the negative pressure through the suction of fan, attracts the tail gas in the tail gas pipe network to arrange to the environment. Therefore, for the whole system, the energy of the tail gas of the heating well is directly discharged along with the tail gas and is not utilized, the energy is wasted, and the efficiency of the whole system is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve present heating well tail gas energy and directly discharge, do not obtain make full use of, the technical problem that heating efficiency is low, for this reason, the utility model provides a malleation backheating type natural gas soil heating repair system and method realizes that soil heating repair system heating efficiency strengthens and the energy can be saved.
The following technical scheme is adopted:
on the one hand, the utility model provides a malleation backheating type natural gas soil heating repair system, including the combustor and with the heater shaft that the combustor is connected, the system still includes air compressor, ejector and heat exchanger, exhaust tail gas in the heater shaft with exhaust compressed air respectively with the heat exchanger is connected, the warp the air admission after the heat exchanger carries out heat exchange the ejector entry, the natural gas of input as draw ejector fluid with the drainage pipeline of ejector connects, the export of ejector with the access connection of combustor.
And a free air control valve is also arranged on a connecting pipeline between the combustor inlet and the ejector outlet.
The system is also provided with a controller, a compressed air control valve is also arranged on an air output pipeline between the inlet of the ejector and the heat exchanger, and the controller is in control connection with the free air control valve and the compressed air control valve respectively.
The system is still equipped with the first temperature sensor that is used for detecting soil temperature, is used for detecting the second temperature sensor of combustor exit temperature and being used for detecting the concentration sensor of natural gas concentration in the heating well surrounding environment, first temperature sensor, second temperature sensor and concentration sensor respectively with the input of controller is connected.
And the controller automatically adjusts the free air control valve and the compressed air control valve in a PID proportional control mode.
The heat exchanger is a dividing wall type heat exchanger.
On the other hand, the utility model also provides a positive pressure backheating type natural gas soil heating and repairing method, the air is pressurized by the air compressor and then is input into the heat exchanger, and the pressurized air and the tail gas of the heating well entering the heat exchanger carry out heat exchange; the preheated air is output by the heat exchanger and enters the ejector to form working fluid; the working fluid is mixed with the injection fluid input into the injector to form high-pressure high-temperature gas which enters the combustor; the mixed gas is combusted in the combustor to form high-temperature and high-pressure flue gas, the high-temperature and high-pressure flue gas is injected into the heating well, the high-temperature and high-pressure flue gas exchanges heat with soil around the heating well, and the tail gas of the heating well is discharged and then is input into the heat exchanger for heat exchange.
The mixed gas output by the ejector is further mixed with non-pressure free air and then enters a hearth of the combustor to be combusted, so that high-temperature and high-pressure flue gas is obtained.
The soil temperature around the heating well, the outlet temperature of the burner and the natural gas concentration in the surrounding environment of the heating well are detected by the sensors and input into the controller, and the controller controls the input amount of compressed air and free air in a PID proportion control mode.
The utility model discloses technical scheme has following advantage:
A. the utility model discloses increased compressed air preheating device in soil heating repair system, adopted and penetrated mixed type combustor and malleation and strengthen the heat transfer heater well, compressed air preheating device compresses the air and utilizes heater well tail gas energy to preheat before getting into the combustor, improves the air temperature. The utility model discloses effectively utilized in the original scheme because directly discharge tail gas and waste heat energy, with this partial energy through the air bring back the system once more, all be the malleation in entire system, utilize fluid pressure and ambient pressure's pressure differential flow in the pipeline, do not need the suction of fan, got rid of the fan of settling behind the heater well in the traditional system, saved the energy.
B. The utility model discloses with the mode of compressed air drainage natural gas, mixed gas gets into the entering through twice air before the combustor, also overcomes the leakage problem of natural gas under the malleation burning condition as far as possible when realizing the malleation burning in the combustor. The air compressor compresses air to increase the pressure of air, the positive pressure combustion process in the combustor further improves flue gas temperature pressure, and the flue gas of high temperature high pressure can be given more heat for soil as the fluid of heating soil, and the higher heat transfer efficiency that the temperature is, the bigger, and the backheat utilizes waste heat energy, also can further improve heating efficiency.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a composition diagram of a positive pressure regenerative natural gas soil heating remediation system;
FIG. 2 is a block diagram of a compressed air preheating system;
FIG. 3 is a flow diagram of a jet mixing burner configuration;
FIG. 4 is a schematic diagram of a positive pressure enhanced heat exchange heater well;
fig. 5 is a composition diagram of a conventional natural gas soil heating remediation system.
Description of reference numerals:
1-a burner; 2-heating a well; 3-an air compressor; 4-an ejector; 5-a heat exchanger; 6-free air control valve; 7-connecting a pipeline; 8-a controller; 9-air output pipeline; 10-compressed air control valves; 20-soil; 30-a natural gas control valve; and 40-a drainage pipeline.
A-a compressed air preheating device; b-positive pressure heat exchange enhancing heating well; c-injection mixed type burner.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in figure 1, the utility model provides a malleation backheating type natural gas soil heating repair system, including compressed air preheating device A, draw and penetrate mixed type combustor C and malleation and strengthen heat transfer heater well B.
Wherein a compressed air preheating device a is used to compress and preheat the primary inlet air to the combustor 1. The utility model provides an air compressor 3 is used for compressed air, is one kind and promotes low-pressure gas for high-pressure gas's driven fluid machinery. It sucks low-temperature and low-pressure air from the air suction pipe, drives the piston to compress the air through the operation of the motor, and then discharges the high-temperature and high-pressure air to the air discharge pipe. The compressed air provides high pressure gas for positive pressure combustion. The air compressor 3 can be classified into a displacement compressor and a speed compressor according to its principle. The displacement compressor is further divided into: reciprocating compressors, rotary compressors; the speed type compressor is further divided into: axial compressors, centrifugal compressors, and mixed flow compressors. Different types and models of compressors are used in different scale of engineering activities. Medium and small centrifugal compressors are usually driven by electric motors, and steam turbines are commonly used in large installations in the modern petroleum and chemical industries. The turbo compressor set is widely applied to the petrochemical industry with a large amount of waste heat, and the waste heat is fully utilized as a power source. The reciprocating compressor is widely applied to various fields of machinery manufacturing, petrifaction, mining machinery, refrigeration and the like, and is important production and operation equipment in the industry. The heat exchanger is a device for transferring part of heat of hot fluid to cold fluid, and is also called as a heat exchanger. The utility model discloses in be used for utilizing the tail gas of 2 exports of heater shaft to preheat compressed air. Combine the utility model discloses an actual application condition is applicable to the dividing wall type heat exchanger. The dividing wall type heat exchanger is characterized in that two fluids with different temperatures flow in a space separated by a wall surface, heat conduction through the wall surface and convection of the fluids on the wall surface are realized, and heat exchange is carried out between the two fluids. The dividing wall type heat exchanger has shell-and-tube type, double-tube type and other types of heat exchangers. The ceramic heat exchanger is a novel tube array type high-temperature heat energy recovery device, the main component of the ceramic heat exchanger is silicon carbide, the ceramic heat exchanger can be widely applied to industries such as metallurgy, machinery, building materials, chemical engineering and the like, and can directly recover the high-temperature smoke waste heat of 850-1400 ℃ discharged by various industrial kilns so as to obtain high-temperature combustion-supporting air or process gas.
The injection mixing type combustor C is used for providing high-temperature and high-pressure flue gas. The utility model provides an ejector 4 is applied to working fluid and is used for the fluid transport as machinery under the same condition of the state of drawing the fluidic, is applicable to gas-gas ejector. The compressed air as working fluid flows out from the nozzle at high speed and enters the suction chamber, and the natural gas as injection fluid is sucked under the turbulent diffusion action of jet flow. The working fluid mixes with the ejector fluid in the mixing chamber, and then the mixed fluid enters the diffusion chamber and the pressure increases as the flow rate decreases. Meanwhile, a free air control valve 6 is arranged on a connecting pipeline 7 between the inlet of the combustor 1 and the outlet of the ejector 4 and used for inputting non-pressure air, namely, the non-pressure air is used as secondary free air to be input, and the mixed gas of the natural gas and the air at the outlet of the ejector 4 still keeps a high flow rate and can be used for ejecting and sucking the inflow of the free air in a pipeline leading to the combustor 1. The compressed air forms high-pressure mixed gas after passing through the ejector 4, and the high-pressure mixed gas is mixed with secondary free air to enter the combustor 1 for positive pressure combustion. During the positive pressure combustion, the pressure in the furnace chamber of the combustor 1 is higher than the environment, and the gas may overflow. And the leakage of natural gas into the environment is both energy waste and certain danger. In order to solve the problem, the utility model discloses set up controller 8 in the system, still be equipped with a compressed air control valve 10 on the air output pipeline 9 between ejector 4 entry and the heat exchanger 5, controller 8 forms control connection with free air control valve 6 and compressed air control valve 10 respectively.
As shown in FIG. 3, the input signal of the controller 8 has three paths, namely, a first temperature sensor (① in FIG. 3) for detecting the temperature of the soil 20, a second temperature sensor (③ in FIG. 3) for detecting the outlet temperature of the burner 1, and a concentration sensor (② in FIG. 3) for detecting the concentration of the natural gas in the environment around the heater well 2, wherein the first temperature sensor, the second temperature sensor, and the concentration sensor are respectively connected with the input end of the controller 8, the obtained signals are adjusted through PID control (proportional, integral, and differential control), the controller 8 makes judgment and sends out command signals, the output signals have two paths, respectively, for controlling the opening degrees of the compressed air control valve 10 and the free air control valve 6, and the natural gas control valve 30 located in the drainage line 40 of the ejector 4 is adjusted according to the current working state and working temperature.
As shown in fig. 4, the positive pressure enhanced heat exchange heating well B of the present invention is used for high pressure self-flowing high temperature and high pressure flue gas from the outlet of the burner 1 in the heating well 2 to exchange heat with the low temperature soil 20. The heater well 2 is a casing into which gas flows from the inner tube, at the bottom of which the gas changes direction and flows from the outer tube. When flowing in the outer tube, there is direct heat conduction through the tube wall to the soil. Meanwhile, the gas in the outer tube and the gas in the inner tube exchange heat through convection heat exchange. The last heat, in addition to being used to heat the soil 20, is discharged from the heater well 2 and flows into the heat exchanger 5 in the compressed air preheater. The vertical heater well is drawn in fig. 4, and the horizontal heater well can also adopt the positive pressure heat regenerative system provided by the utility model. Taking a vertical heating well as an example, the single-well efficiency of the heating well is mainly determined by the factors such as the sizes of the inner and outer pipe diameters, the lengths of the pipes, the length difference between the inner and outer pipes, and the like. The field layout of the heater well 2 is mostly in the form of triangle, quadrangle and hexagon, and the tube pitch and the field layout are also factors affecting the heating effect. The higher the temperature of the high temperature flue gas used for heating, the higher the heating efficiency, with the same size and site layout.
The utility model discloses a malleation backheating type natural gas soil heating restoration method as follows:
step 1, compressing air, pressurizing by 3, inputting the air into a heat exchanger 5, and exchanging heat between the pressurized air and tail gas entering a heating well 2 in the heat exchanger 5;
And 4, combusting the mixed gas in the combustor 1 to form high-temperature and high-pressure flue gas, injecting the high-temperature and high-pressure flue gas into the heating well 2, exchanging heat between the high-temperature and high-pressure flue gas and soil 20 around the heating well 2, and inputting the tail gas of the heating well 2 into a heat exchanger 4 for heat exchange after being discharged, as shown in figure 2.
The soil temperature around the heating well, the outlet temperature of the burner and the natural gas concentration in the surrounding environment of the heating well are detected by the sensors and input into the controller 8, and the controller 8 controls the input amount of compressed air and free air in a PID proportion control mode.
The heat exchanger in fig. 1 recovers heat from tail gas in two sets of heating wells, and certainly can combine tail gas from more heating wells together, so that three parts of the whole soil heating and repairing system are mutually matched to fulfill the aims of saving energy and improving the efficiency of heating soil. After the outside air passes through the air compressor, the compressed air is subjected to heat exchange with tail gas at the outlet of the heating well in the heat exchanger. After the preheated compressed air is injected into the natural gas through the ejector, the fully mixed gas enters the combustor to be combusted in a positive pressure mode, and secondary free air is used for supplementing. The high-temperature and high-pressure gas generated by combustion flows automatically in the heating well and exchanges heat with soil. The high-temperature tail gas is heated by the heat exchanger to compress air to complete circulation. The ejector is a device for pumping fluid and mixing multiple phases, which uses the shape of a nozzle to reduce the pressure and accelerate the working fluid, generates high-speed jet flow, and transfers energy and mass through the turbulent diffusion effect of the high-speed fluid. The utility model discloses well structure that adopts the ejector includes nozzle, suction chamber, mixing chamber and diffusion chamber. It has the advantages that: the structure is relatively simple, the noise is low, the volume is small and exquisite, the processing and the production are convenient, the cost is low, and the maintenance and the replacement are convenient; the energy loss caused by the friction force of the transmission part can be reduced without mechanical transmission equipment; the structure has good sealing performance and high working efficiency, and can stably operate for a long time in extreme environments such as high temperature and high pressure.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. The utility model provides a malleation backheating type natural gas soil heating repair system, including combustor (1) and with heater-well (2) that combustor (1) is connected, its characterized in that, the system still includes air compressor (3), ejector (4) and heat exchanger (5), exhaust tail gas in heater-well (2) with exhaust compressed air respectively in air compressor (3) with heat exchanger (5) are connected, the warp air after heat exchange is carried out in heat exchanger (5) gets into ejector (4) entry, the natural gas of input as draw injection fluid with drainage pipeline (40) of ejector (4) are connected, the export of ejector (4) with the access connection of combustor (1).
2. The positive pressure heat recovery type natural gas soil heating and restoring system according to claim 1, wherein a free air control valve (6) is further arranged on a connecting pipeline (7) between the inlet of the combustor (1) and the outlet of the ejector (4).
3. The positive pressure heat recovery type natural gas soil heating and restoring system according to claim 2, wherein a controller (8) is further arranged in the system, a compressed air control valve (10) is further arranged on an air output pipeline (9) between the inlet of the ejector (4) and the heat exchanger (5), and the controller (8) is in control connection with the free air control valve (6) and the compressed air control valve (10) respectively.
4. The positive pressure heat recovery type natural gas soil heating and repairing system according to claim 3, wherein the system is further provided with a first temperature sensor for detecting the temperature of soil (20), a second temperature sensor for detecting the outlet temperature of the burner (1) and a concentration sensor for detecting the concentration of natural gas in the environment around the heating well (2), and the first temperature sensor, the second temperature sensor and the concentration sensor are respectively connected with the input end of the controller (8).
5. The positive pressure regenerative natural gas soil heating remediation system according to claim 4, wherein the controller (8) automatically adjusts the free air control valve (6) and the compressed air control valve (10) by means of PID proportional control.
6. The positive pressure regenerative natural gas soil heating remediation system of claim 1, wherein the heat exchanger (5) is a dividing wall type heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921718186.9U CN210701673U (en) | 2019-10-14 | 2019-10-14 | Positive pressure heat regeneration type natural gas soil heating repair system |
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| CN201921718186.9U CN210701673U (en) | 2019-10-14 | 2019-10-14 | Positive pressure heat regeneration type natural gas soil heating repair system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110586638A (en) * | 2019-10-14 | 2019-12-20 | 森特士兴集团股份有限公司 | Positive-pressure regenerative natural gas soil heating and repairing system and method thereof |
| CN112705564A (en) * | 2020-12-08 | 2021-04-27 | 江苏维诗环境科技有限公司 | Thermal desorption temperature monitoring system based on remote management |
-
2019
- 2019-10-14 CN CN201921718186.9U patent/CN210701673U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110586638A (en) * | 2019-10-14 | 2019-12-20 | 森特士兴集团股份有限公司 | Positive-pressure regenerative natural gas soil heating and repairing system and method thereof |
| CN112705564A (en) * | 2020-12-08 | 2021-04-27 | 江苏维诗环境科技有限公司 | Thermal desorption temperature monitoring system based on remote management |
| CN112705564B (en) * | 2020-12-08 | 2022-04-05 | 江苏维诗环境科技有限公司 | Thermal desorption temperature monitoring system based on remote management |
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