Semicircular tube ascending tube heat exchange device and energy-saving heat recovery system

Abstract

The utility model discloses a semicircle tube riser heat exchange device and energy-saving heat recovery system, the device comprises an inner cylinder, a plurality of semicircle tubes, a jacket cylinder and an outer cylinder, the inner cavity of the inner cylinder is used for raw coke oven gas to flow, the inner cylinder is provided with a water diversion chamber and a water collection chamber which are communicated with the semicircle tubes; the semicircular pipes are uniformly welded on the outer side of the inner cylinder in a vertical manner to form a heat exchange layer for introducing a heat exchange medium; a heat storage and conduction layer is arranged in a gap between the jacket cylinder and the semicircular pipe as well as the inner cylinder; and a heat insulation layer is arranged in a gap between the outer cylinder and the jacket cylinder. According to the device, the inner cylinder, the semicircular pipe, the jacket cylinder and the outer cylinder are matched, heat exchange with raw gas flowing in the inner pipe is facilitated through the heat exchange layer formed by the semicircular pipe and the inner pipe, and the device has the effects of being high in heat exchange efficiency and reliable in safety under the action of the heat storage and conduction layer and the heat insulation material.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchange device technical field, concretely relates to a kind of semi-circular pipe riser heat exchange device and energy-saving heat recovery system for coking industry coke oven raw coal gas waste heat recovery. BACKGROUND

[0002] Current domestic coking process is mainly that coking coal is heated dry distillation in coke oven, coke is generated, and a large amount of volatile raw coal gas is generated. The sensible heat of 950 DEG C~1050 DEG C red coke taken out from coke oven carbonization chamber accounts for 37% of the heat expenditure of coke oven. The sensible heat of 650 DEG C~800 DEG C coke oven raw coal gas accounts for 36% of the heat expenditure of coke oven. The heat of 180 DEG C~230 DEG C coke oven flue gas accounts for 17% of the heat expenditure of coke oven. The heat loss of furnace surface accounts for 10% of the heat expenditure of coke oven.

[0003] There is a mature coke oven riser waste heat recovery technology to recover the heat of raw coal gas at present, and the core equipment is riser heat exchanger. The structure type of riser heat exchanger is mainly divided into three kinds: (1) jacketed structure, (2) outer coil type, (3) internal insertion type. The three structure types have characteristics respectively, and are applied to different working conditions.

[0004] The jacketed riser heat exchanger is composed of water jacket layer, inner cylinder, shell and the like, exchanges heat with high-temperature raw coal gas through water, and generates steam. The outer coil type riser heat exchanger is composed of coil, heat conduction layer, inner cylinder, shell and the like, exchanges heat with high-temperature raw coal gas through water, and generates steam. The heat exchange space of the above two heat exchangers is outside the inner cylinder of riser. The internal insertion type heat exchanger is composed of heat exchange pipe and fixing frame and the like, is directly installed inside riser, exchanges heat with high-temperature raw coal gas through water, and generates steam. The heat exchange space of this kind of heat exchanger is inside riser. The inner cylinder of jacketed riser heat exchanger is subjected to external pressure, and the steam pressure is low, so that medium and high pressure steam cannot be generated. The heat exchange space of outer coil type riser heat exchanger is outside the inner cylinder of riser, does not directly contact with raw coal gas, and the heat exchange efficiency is relatively low, and the pipe resistance is large. The internal insertion type heat exchanger occupies the flow area of raw coal gas, is not conducive to the flow of raw coal gas, directly contacts with raw coal gas, and there is the danger of corrosion and leakage, so that the application case is less. At present, a coke oven riser heat exchange device with high heat exchange efficiency and safety and reliability is urgently needed. UTILITY MODEL CONTENTS

[0005] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide a semi-circular pipe riser heat exchange device to solve the above-mentioned traditional problems.

[0006] The second purpose of the utility model is to provide an energy-saving heat recovery system using the semi-circular pipe riser heat exchange device.

[0007] The utility model discloses one of the purposes adopts following technical scheme realization:

[0008] A half circle pipe ascending pipe heat exchange device, including inner tube, a plurality of half circle pipes of setting in the outer side of inner tube, jacket sleeve and outer tube, the inner chamber of inner tube is used for the flow of raw coal gas, the inner tube is equipped with the water distribution room and the water collecting room of communication with half circle pipe, each half circle pipe adopts even welding in the outer side of inner tube with vertical mode to form the heat exchange layer for the heat exchange medium of going in, the clearance between jacket sleeve and half circle pipe, inner tube is equipped with heat storage heat conduction layer, and the clearance between outer tube and jacket sleeve is equipped with heat insulation layer.

[0009] Preferably, the inner side of the inner tube is coated with a corrosion-resistant heat-resistant layer, which is a ceramic-based nano heat-conducting layer.

[0010] Preferably, the thickness of the corrosion-resistant heat-resistant layer is 0.5-5mm.

[0011] Preferably, the two ends of the inner tube are provided with flanges, and the upper and lower parts of the jacket sleeve and the outer tube are welded with the flanges.

[0012] Preferably, the inner tube is provided with flanges, water inlet pipes and water outlet pipes, the water inlet pipes are communicated with the water distribution room, and the water outlet pipes are communicated with the water collecting room.

[0013] Preferably, the heat storage heat conduction layer is one or more of aluminum oxide, magnesium oxide, zinc oxide, aluminum nitride, boron nitride and silicon carbide.

[0014] Preferably, the thickness of the heat storage heat conduction layer is 15-80mm.

[0015] Preferably, at least one first leakage detection hole is arranged on the jacket sleeve, and at least one second leakage detection hole is arranged on the outer tube.

[0016] Preferably, a first expansion joint is further arranged on the jacket sleeve, and a second expansion joint is further arranged on the outer tube.

[0017] The utility model discloses the second purpose adopts following technical scheme realization:

[0018] An energy-saving heat recovery system comprises the half circle pipe ascending pipe heat exchange device.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] The half circle pipe ascending pipe heat exchange device of the utility model cooperates the inner tube, the half circle pipe, the jacket sleeve and the outer tube through the heat exchange layer formed by the half circle pipe and the inner tube, so that the raw coal gas flowing in the inner tube can be easily heat-exchanged, and the heat storage heat conduction layer and the heat insulation material can make the heat exchange device have the effects of high heat exchange efficiency and reliable safety. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a longitudinal sectional view of the semi-circular pipe rising pipe heat exchange device of the utility model;

[0022] Figure 2 is Figure 1 is a transverse sectional view of the semi-circular pipe rising pipe heat exchange device shown in the figure;

[0023] Figure 3 is Figure 2 is a connection diagram of the inner cylinder and the semi-circular pipe shown in the figure.

[0024] In the figure: 10, inner cylinder; 11, water distribution chamber; 12, water collecting chamber; 13, anticorrosive and heat-resistant layer; 14, flange; 15, water inlet pipe; 16, water outlet pipe; 20, semi-circular pipe; 21, heat exchange layer; 30, clamping sleeve; 31, heat storage and heat conduction layer; 32, first leakage detection hole; 33, first expansion joint; 40, outer cylinder; 41, heat insulation layer; 42, second leakage detection hole; 43, second expansion joint. DETAILED DESCRIPTION

[0025] In order to make the above objectives, features and advantages of the utility model more apparent, comprehensible and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] In the description of the utility model, it is to be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0027] In the description of the utility model, it is to be understood that when an element is considered to be "connected" to another element, it can be directly connected to another element or there can be intermediate elements. In contrast, when the element is referred to as "directly" connected to another element, there is no intermediate element.

[0028] Please refer to Figures 1-3For the semi-circular pipe rising pipe heat exchange device of the preferred embodiment of the present application, the semi-circular pipe rising pipe heat exchange device is used for recovering waste heat of coke oven raw coal gas in a coking industry, and specifically, the semi-circular pipe rising pipe heat exchange device comprises an inner cylinder 10, a plurality of semi-circular pipes 20 arranged outside the inner cylinder 10, a jacketed cylinder 30, and an outer cylinder 40, an inner cavity of the inner cylinder 10 is used for flowing of the raw coal gas, the inner cylinder 10 is provided with a water distribution chamber 11 and a water collecting chamber 12 which are in communication with the semi-circular pipes 20, each semi-circular pipe 20 is evenly welded outside the inner cylinder 10 in a vertical manner to form a heat exchange layer 21 for passing in a heat exchange medium, the gap between the jacketed cylinder 30 and the semi-circular pipes 20 and the inner cylinder 10 is filled with a heat storage and heat conduction material to form a heat storage and heat conduction layer 31, and the gap between the outer cylinder 40 and the jacketed cylinder 30 is filled with a heat insulation material to form a heat insulation layer 41. The heat exchange medium can be water, hot coal oil or the like.

[0029] The semi-circular pipe rising pipe heat exchange device is matched with the inner cylinder 10, the semi-circular pipes 20, the jacketed cylinder 30 and the outer cylinder 40, the heat exchange layer 21 formed by the semi-circular pipes 20 and the inner cylinder 10 is convenient for heat exchange with the raw coal gas flowing in the inner cylinder 10, and the heat storage and heat conduction layer 31 and the heat insulation material can make the semi-circular pipe rising pipe heat exchange device have the effects of high heat exchange efficiency and reliable safety.

[0030] In the embodiment, the inner side of the inner cylinder 10 is coated with an anticorrosive and heat-resistant layer 13, the thickness of the anticorrosive and heat-resistant layer 13 is 0.5-5 mm, and the thickness of the anticorrosive and heat-resistant layer can be adjusted according to the heat exchange requirement. In one of the embodiments, the anticorrosive and heat-resistant layer 13 is a ceramic-based nano heat conduction layer which is composed of a ceramic-based nano heat conduction material and has the effects of high temperature resistance and corrosion resistance, can effectively prevent the erosion of the corrosion medium in the raw coal gas, has a high heat conduction coefficient, forms a smooth glaze surface at high temperature, is not easy to adhere to impurities, and effectively guarantees the heat exchange efficiency.

[0031] The two ends of the inner cylinder 10 are provided with flanges 14, the flanges 14 are connected to the discharge pipe of the raw coal gas in a connecting manner, the upper and lower parts of the jacketed cylinder 30 and the outer cylinder 40 are welded to the flanges 14. The inner cylinder 10 is further provided with a water inlet pipe 15 and a water outlet pipe 16, the water inlet pipe 15 is in communication with the water distribution chamber 11, and the water outlet pipe 16 is in communication with the water collecting chamber 12. The inner cylinder 10 is made of heat-resistant alloy steel and is processed by a seamless steel pipe, and the contact part with the raw coal gas is free of any weld.

[0032] The semi-circular pipes 20 are welded outside the inner cylinder 10 in a vertical manner, and the number and diameter size of the semi-circular pipes 20 can be designed and selected according to the heat exchange capacity of the rising pipe heat exchanger. The water is uniformly distributed into each semi-circular pipe 20 through the water distribution chamber 11, is concentrated through the water collecting chamber 12, and is then outputted. The semi-circular pipes 20 are made of heat-resistant alloy material and have the same thermal expansion coefficient as the inner cylinder 10.

[0033] The jacket sleeve 30 is installed outside the semicircular pipe 20, and the upper and lower ends are welded on the upper and lower flanges 14, respectively. The jacket sleeve 30 mainly plays a supporting role and forms a load-bearing framework with the inner sleeve 10 to bear the weight of the upper three-way pipe, bridge pipe, water seal and other components of the riser. The jacket sleeve 30 can be made of carbon steel, stainless steel and the like. The gap between the jacket sleeve 30, the inner sleeve 10 and the semicircular pipe 20 is filled with a heat-accumulating and heat-conducting filler. The heat-accumulating and heat-conducting filler is a kind of heat-conducting and moldable silicon carbide filler, which can effectively improve the heat conductivity of the riser heat exchanger, enhance the heat exchange performance, and improve the heat exchange efficiency of the heat exchange device. In one embodiment, the heat-accumulating and heat-conducting layer 31 is one or more of aluminum oxide, magnesium oxide, zinc oxide, aluminum nitride, boron nitride, and silicon carbide. In other embodiments, other heat-accumulating and heat-conducting fillers can also be selected, which will not be described here. Optionally, the thickness of the heat-accumulating and heat-conducting layer 31 is 15-80 mm, and the thickness of the heat-accumulating and heat-conducting layer can be adjusted according to the size of the jacket sleeve.

[0034] The gap between the jacket sleeve 30 and the outer sleeve 40 is a heat-insulating layer 41. The heat-insulating layer is made of aerogel, fiber felt and heat-insulating paint, and is provided with a multi-layer structure. On the one hand, the ambient temperature is effectively reduced to protect the environment. On the other hand, the heat is not dissipated to ensure sufficient heat exchange inside.

[0035] The outer sleeve 40 is made of stainless steel, which is corrosion-resistant and has an attractive appearance.

[0036] The jacket sleeve 30 is provided with at least one first leakage detection hole 32, and the outer sleeve 40 is provided with at least one second leakage detection hole 42. Once the semicircular pipe 20 leaks, water vapor will overflow through the leakage detection hole to form water mist, which is convenient for operation and maintenance personnel to discover and handle in time. Optionally, there are two leakage detection holes, which are respectively arranged at the upper and lower parts of the jacket sleeve 30 and the outer sleeve 40, so as to detect the leakage at different positions.

[0037] In this embodiment, the jacket sleeve 30 is also provided with a first expansion joint 33, and the outer sleeve 40 is also provided with a second expansion joint 43. The position of the first expansion joint 33 on the jacket sleeve 30 corresponds to the position of the second expansion joint 43 on the outer sleeve 40, so as to improve the safety performance of the equipment.

[0038] The above device has the following characteristics:

[0039] (1) The inner sleeve 10 is uniformly provided with a certain number of semicircular pipes 20 outside, forming a plurality of heat exchange flow channels, which has the advantages of high heat exchange efficiency, high pressure resistance, small resistance and safety and reliability;

[0040] (2) The inner sleeve 10 and the semicircular pipe 20 are made of heat-resistant alloy steel. The inner sleeve 10 is a seamless structure, and is coated with a corrosion-resistant heat-conducting layer, which is safe and reliable.

[0041] (3) The water amount of the ascending pipe heat exchange layer 21 is small, safe operation is realized, and the supervision and inspection problem of the pressure container is avoided, and use is more convenient.

[0042] In some other embodiments, the utility model also provides an energy-saving heat recovery system, adopt the above-mentioned half circle pipe ascending pipe heat exchange device to replace the coke oven original ascending pipe straight pipe section, the brine is entered into the steam pocket after deaeration, the water is sent into the ascending pipe heat exchange device import by the forced circulation pump, enters the half circle pipe ascending pipe heat exchange device and carries out heat exchange, absorbs the heat of the waste gas, produces the steam water mixture through the heat exchanger export, is sent into the steam pocket and carries out steam water separation, the steam is sent out through the steam outlet of the steam pocket, the unvaporized water is recycled and heat exchanged again, so the saturation steam or superheated steam that meets the needs pressure is produced.

[0043] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0044] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, on the premise of not departing from the utility model concept, a number of variations and improvements can be made, these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A semi-circular tube riser heat exchanger device, characterized in that, The device comprises an inner cylinder, a plurality of semicircular tubes arranged outside the inner cylinder, a jacketed cylinder and an outer cylinder, an inner cavity of the inner cylinder is used for flowing of raw coal gas, the inner cylinder is provided with a water distribution chamber and a water collecting chamber communicated with the semicircular tubes, each of the semicircular tubes is welded on the outer side of the inner cylinder in a vertical manner to form a heat exchange layer for passing heat exchange medium; a heat storage and heat conduction layer is arranged in the gap between the jacketed cylinder, the semicircular tubes and the inner cylinder, and a heat insulation layer is arranged in the gap between the outer cylinder and the jacketed cylinder.

2. The semi-tube riser heat exchanger according to claim 1, characterized in that, The inner side of the inner cylinder is coated with a corrosion and heat resistant layer, and the corrosion and heat resistant layer is a ceramic-based nano heat conduction layer.

3. The semi-tube riser heat exchanger according to claim 2, characterized in that, The thickness of the corrosion and heat resistant layer is 0.5-5mm.

4. The semi-tube riser heat exchanger according to claim 1, characterized in that, Both ends of the inner cylinder are provided with flanges, and the upper and lower parts of the jacketed cylinder and the outer cylinder are welded with the flanges.

5. The semi-tube riser heat exchanger according to claim 1, characterized in that, The inner cylinder is provided with flanges, a water inlet pipe and a water outlet pipe, the water inlet pipe is communicated with the water distribution chamber, and the water outlet pipe is communicated with the water collecting chamber.

6. The semi-tube riser heat exchanger of claim 1, wherein, The heat storage and heat conduction layer is an aluminum oxide layer, a magnesium oxide layer, a zinc oxide layer, an aluminum nitride layer, a boron nitride layer or a silicon carbide layer.

7. The semi-tube riser heat exchanger according to claim 6, characterized in that The thickness of the heat storage and heat conduction layer is 15-80mm.

8. The semi-tube riser heat exchanger of claim 1, wherein, At least one first leakage detection hole is arranged on the jacketed cylinder, and at least one second leakage detection hole is arranged on the outer cylinder.

9. The semi-tube riser heat exchanger according to claim 8, characterized in that, A first expansion joint is further arranged on the jacketed cylinder, and a second expansion joint is further arranged on the outer cylinder.

10. An energy saving heat recovery system characterized by, The device comprises the semicircular tube rising pipe heat exchange device according to any one of claims 1-9.

Images