Efficient and safe low-temperature medium gasifier

Abstract

An efficient and safe low-temperature medium gasifier comprises a shell (1) filled with an intermediate medium for heat exchange, a low-temperature medium gasification unit (2) and a steam condensation unit (3), and is characterized in that an upper shell section (1.2) is mounted at the upper part of one end of the shell (1) and is connected with a shell side equipment flange (2.9) of the low-temperature medium gasification unit (2) through an upper flange (1.3); a gasification tube bundle of the low-temperature medium gasification unit (2) is positioned in the shell (1); the lower portion of the other end of the shell (1) is provided with a lower shell section (1.5), the lower shell section (1.5) is connected with a shell side equipment flange of the steam condensation unit (3) through a lower flange (1.6), and a condensation pipe bundle of the steam condensation unit (3) is also located in the shell (1). The pass partition plate and the guide plate are creatively added into the gasifier, so that the heat transfer efficiency is high, the structure is compact, and the occupied space is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of heat exchange especially, and it is a kind of gasifier, specifically, it is a kind of high-efficiency safe low-temperature medium gasifier. BACKGROUND

[0002] The temperature of low-temperature medium is usually liquid-phase medium below-80 DEG C, and common ones include liquid ethane, liquid ethylene, liquid methane, liquid oxygen, liquid nitrogen and the like.Low-temperature medium gasifier is a heat exchanger for heating liquid low-temperature medium until gasification (into gas), and the gasification heat source generally adopts steam.The temperature of steam is generally between 130 DEG C and 250 DEG C, and the temperature of low-temperature medium is generally between-120 DEG C and 40 DEG C, and the direct heat exchange of cold and hot medium with too large temperature difference greatly influences the mechanical properties of metal material, and the icing problem of steam condensate exists, which influences the use safety of equipment.

[0003] Taking liquid ethylene as an example, ethylene exists in the form of liquid phase in ethylene tank, and the temperature is about-100 DEG C, and it is generally necessary to use steam to heat and gasify it and to superheat it to above 20 DEG C and then send it to downstream user.In previous technologies, CN211069039U discloses a tower-type ethylene gasifier, which adopts kettle-type reboiler to gasify ethylene, and sets up superheater at the top to heat the gasified ethylene to appropriate temperature.The occupied space is large, and pipelines are needed to connect between heat sources.

[0004] CN203927392U discloses the way of gasifying ethylene by using air heater, which is not conducive to low-temperature cold energy recovery, and does not mention how to reduce manufacturing cost.

[0005] There is also an ethylene gasifier, and the ethylene tube bundle adopts BEU type tube bundle structure, as shown in the drawing. Figure 1 Since the ethylene inlet is low-temperature liquid of-100 DEG C, and the ethylene outlet is normal-temperature gas above 20 DEG C, the temperature difference between the upper half and the lower half of tube plate is large, and the deformation amount is different, which often causes leakage between tube plate and flange sealing surface.In actual operation process, with the fluctuation of upstream and downstream device load and the shutdown of upstream device, the flow of ethylene fluctuates greatly, and the leakage problem often occurs at flange connection. CONTENT OF UTILITY MODEL

[0006] The utility model aims at the problems of large occupied area, high manufacturing cost, large temperature difference of low-temperature medium gasifier and easy leakage of existing low-temperature gasifier, and designs a kind of high-efficiency safe low-temperature medium gasifier.

[0007] The technical scheme of the utility model is:

[0008] The application discloses a high-efficiency and safe low-temperature medium gasifier, which comprises a shell 1 filled with an intermediate medium for heat exchange, a low-temperature medium gasification unit 2 and a steam condensation unit 3, characterized in that: an upper cylinder section 1.2 is arranged on the upper portion of one end of the shell 1, the upper cylinder section 1.2 is connected with the shell side equipment flange 2.9 of the low-temperature medium gasification unit 2 through an upper flange 1.3, and the gasification tube bundle of the low-temperature medium gasification unit 2 is arranged at the upper portion of the shell 1; a lower cylinder section 1.5 is arranged on the lower portion of the other end of the shell 1, the lower cylinder section 1.5 is connected with the shell side equipment flange of the steam condensation unit 3 through a lower flange 1.6, and the condensation tube bundle of the steam condensation unit 3 is arranged at the lower portion of the shell 1.

[0009] The shell 1 is filled with the intermediate medium, the liquid level of the intermediate medium needs to be higher than the tube bundle 100-300 mm of the steam condensation unit 3, the heat release of the steam condensation unit makes the intermediate medium in the shell 1 absorb heat and evaporate, the intermediate medium after absorbing heat and evaporating exchanges heat with the low-temperature medium gasification unit so as to make the liquid low-temperature medium therein warm up and gasify, the gasified gas is discharged and used by subsequent gas equipment, meanwhile, the intermediate medium is condensed by the low-temperature medium and becomes liquid and falls into the area of the steam condensation unit 3 for being gasified again.

[0010] The shell 1 is composed of an intermediate cylinder section 1.1, the upper cylinder section 1.2, the upper flange 1.3, two shell side heads 1.4, the lower cylinder section 1.5 and the lower flange 1.6, the two shell side heads 1.4 are respectively arranged at the two ends of the intermediate cylinder section 1.1, the upper cylinder section 1.2 is fixed on the upper portion of the shell side head at one end and connected with the upper flange 1.3, and the lower cylinder section 1.5 is fixed on the lower portion of the other shell side head and connected with the lower flange 1.6.

[0011] The low-temperature medium gasification unit 2 comprises a tube plate 2.1, a low-temperature liquid inlet 2.2, a gas outlet 2.7, a shell side equipment flange 2.9, a tube box flange 2.5, a tube box cylinder section 2.8, a tube box head 2.4 and a gasification tube bundle 2.10, the low-temperature liquid inlet 2.2 and the gas outlet 2.7 are respectively communicated with the inside of the tube box cylinder section 2.8, the shell side equipment flange 2.9 is connected with the upper flange 1.3, the gasification tube bundle 2.10 is connected with the tube box cylinder section 2.8 through the tube plate 2.1, the tube box head 2.4 is connected with the tube box flange 2.5, and a split-range baffle 2.3 is arranged in the tube box cylinder section 2.8.

[0012] The split-range baffle 2.3 is of an "L" type structure, one end of the split-range baffle 2.3 is fixed on the tube plate 2.1, the other end is fixed on the tube box cylinder section 2.8, and the split-range baffle divides the gasification U-shaped tube bundle into a first tube range and a second tube range.

[0013] The tube box body 2.8 is provided with a flow guide plate 2.6. The flow guide plate guides the heated gas to the area between the partition plate 2.3 and the tube box head 2.4, so that the fluid temperature in this area is equal to the outlet gas temperature, and the temperature of the upper half of the tube box head 2.4 and the tube box flange 2.5 is equal to the temperature of the lower half of the tube box.

[0014] The tube sheet 2.1 is welded to the tube box body 2.8 and the shell-side equipment flange 2.9.

[0015] The vaporization tube bundle 2.10 may be a textured tube, finned tube, high evaporation tube, or high flux tube type that enhances external evaporation, or an inner groove tube or inner finned tube type that enhances internal heat transfer, or a double-sided reinforced inner wave and outer threaded tube type that simultaneously enhances internal and external heat transfer.

[0016] As a preferred technical solution of this utility model, a spiral ribbon is inserted into the gasification tube bundle of the low-temperature medium gasification unit 2.10.

[0017] The condenser tube bundle of the steam condensation unit 3 may be a finned tube, T-groove tube, or high evaporation tube type that enhances the evaporation of the medium outside the tube, or an inner finned tube type that enhances the heat transfer inside the tube, or a double-sided enhanced inner wave outer threaded tube or inner finned outer threaded tube type that simultaneously enhances the heat transfer inside and outside the tube.

[0018] The working principle of this utility model is as follows:

[0019] The intermediate medium shell is filled with an intermediate medium. The steam condensation unit is immersed in the liquid intermediate medium. Steam, as a heat source, passes through the steam condensation unit and transfers heat to the intermediate medium. The liquid intermediate medium evaporates into a gaseous phase. The gaseous intermediate medium rises and contacts the top low-temperature medium vaporization unit, transferring heat to the low-temperature medium. The low-temperature medium is heated, vaporized, and further superheated. The gaseous intermediate medium is condensed into a liquid phase outside the low-temperature medium vaporization unit. Under gravity, the liquid intermediate medium falls back to the steam condensation unit area and is reheated and evaporated, thus repeating the cycle. Through the evaporation and condensation process of the intermediate medium, heat transfer between steam and the low-temperature medium is achieved, avoiding direct heat exchange and reducing the temperature difference between the metal walls inside and outside the pipe. The intermediate medium shell includes an intermediate cylinder, an upper cylinder section, an upper flange, two shell-side end caps, a lower cylinder section, and a lower flange.

[0020] The beneficial effects of this utility model are:

[0021] (1) The gasifier of the utility model, the low temperature medium gasification unit is provided with a guide plate, the guide plate guides the heated gas to the area between the distribution partition plate and the pipe box head, so that the fluid temperature of this area is equal to the temperature of the outlet gas, so that the temperature of the upper half area of the pipe box head and the pipe box flange is equal to the temperature of the lower half area, the circumferential metal temperature of the flange is uniform, and the metal deformation is consistent, so that the medium leakage problem does not occur, the supply of the downstream raw material is ensured, and the stable operation of the device is ensured.

[0022] (2) The gasifier of the utility model uses the pipe type of heat transfer enhancement, improves the heat transfer efficiency, reduces the number of heat exchange pipes required, thereby reducing the volume of the equipment, making the equipment structure compact and occupying small space. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structure schematic view of the prior art BEU type pipe bundle type gasifier.

[0024] Figure 2 It is a structure schematic view of the low temperature medium gasifier of the embodiment of the utility model.

[0025] Figure 3 It is a structure schematic view of the low temperature medium gasification unit in the embodiment of the utility model.

[0026] Figure 4 It is a structure schematic view of the conventional distribution partition plate in the comparative example 2.

[0027] Figure 5 It is a structure schematic view of the pipe box without the guide plate in the comparative example 3.

[0028] In the drawing: 1 - intermediate medium shell, 1.1 - intermediate cylinder body, 1.2 - upper cylinder section, 1.3 - upper flange, 1.4 - shell side head, 1.5 - lower cylinder section, 1.6 - lower flange, 2 - low temperature medium gasification unit, 2.1 - tube sheet, 2.2 - low temperature liquid inlet, 2.3 - distribution partition plate, 2.4 - pipe box head, 2.5 - pipe box flange, 2.6 - guide plate, 2.7 - gas outlet, 2.8 - pipe box cylinder body, 2.9 - shell side equipment flange, 2.10 - gasification U type pipe bundle, 3 - steam condensation unit, 3.1 condensation U type pipe bundle.

[0029] The utility model will be further described in detail below. However, the following examples are only simple examples of the utility model, and do not represent or limit the protection scope of the utility model, and the protection scope of the utility model is subject to the claims. DETAILED DESCRIPTION

[0030] For better illustrating the utility model, facilitating understanding the technical scheme of the utility model, the typical but non-restrictive embodiments of the utility model are as follows:

[0031] As Figure 2 , Figure 3 Indicated.

[0032] An efficient and safe low-temperature medium gasifier, as Figure 1 Indicated, the low-temperature medium gasifier includes intermediate medium shell 1, low-temperature medium gasification unit 2 and steam condensation unit 3.

[0033] The intermediate medium shell 1 is provided with intermediate cylinder body 1.1, upper cylinder section 1.2, upper flange 1.3, two shell side heads 1.4, lower cylinder section 1.5 and lower flange 1.6.

[0034] The low-temperature medium gasification unit 2 mainly includes tube sheet 2.1, low-temperature liquid inlet 2.2, gas outlet 2.7, shell side equipment flange 2.9, tube box flange 2.5, tube box cylinder body 2.8, tube box head 2.4 and gasification U-shaped tube bundle 2.10.

[0035] The tube box cylinder body 2.8 is provided with a split range baffle 2.3;

[0036] The split range baffle 2.3 is of "L" type, one end is fixed to the tube sheet 2.1, and the other end is fixed to the tube box cylinder body 2.8;

[0037] The tube box cylinder body 2.8 is provided with a guide vane 2.6;

[0038] The tube sheet 2.1 adopts a welding structure and is welded and connected with the tube box cylinder body 2.8 and the shell side equipment flange 2.9.

[0039] In the utility model, the form of the gasification U-shaped tube bundle 2.10 can be roughened tube, finned tube, high evaporation tube, high flux tube and other enhanced tube outer evaporation tube type, can also be inner groove tube, inner fin tube and other enhanced tube inner heat transfer tube type, can also be inner wave outer thread tube, inner fin outer thread and other double-face enhanced tube type which simultaneously enhances tube inner and tube outer heat transfer.

[0040] Preferably, the gasification U-shaped tube bundle 2.10 is inserted with a spiral ribbon.

[0041] In the utility model, the form of the condensation U-shaped tube bundle 3.1 of the steam condensation unit 3 can be finned tube, T-groove tube, high evaporation tube and other enhanced tube outer medium evaporation tube type, can also be inner fin tube and other enhanced tube inner heat transfer tube type, can also be inner wave outer thread tube, inner fin outer thread and other double-face enhanced tube type which simultaneously enhances tube inner and tube outer heat transfer.

[0042] Further, in order to illustrate the excellent effects of the low-temperature medium gasifier, the actual examples are used for illustration, and the specific process is as follows:

[0043] Embodiment 1.

[0044] The high-efficiency and safe low-temperature medium gasifier provided in the embodiment comprises an intermediate medium shell 1, a low-temperature medium gasification unit 2 and a steam condensing pipe bundle 3.

[0045] The intermediate medium shell 1 is provided with an intermediate cylinder body 1.1, an upper cylinder section 1.2, an upper flange 1.3, two shell side heads 1.4, a lower cylinder section 1.5 and a lower flange 1.6. Figure 2 .

[0046] The low-temperature medium gasification unit 2 mainly comprises a tube sheet 2.1, a low-temperature liquid inlet 2.2, a gas outlet 2.7, a shell side equipment flange 2.9, a tube box flange 2.5, a tube box cylinder body 2.8, a head 2.4 and a gasification U-shaped pipe bundle 2.10. Figure 3

[0047] The tube box cylinder body 2.8 is provided with a split range partition plate 2.3;

[0048] The split range partition plate 2.3 is in an "L" shape, one end of which is fixed to the tube sheet 2.1 and the other end of which is fixed to the tube box cylinder body 2.8.

[0049] The tube box cylinder body 2.8 is provided with a flow guide plate 2.6;

[0050] The tube sheet 2.1 adopts a welding structure and is welded and connected with the tube box cylinder body 2.8 and the shell side equipment flange 2.9.

[0051] The gasification U-shaped pipe bundle 2.10 adopts an inner fin outer thread pipe, the thread structure of the outer wall of the pipe can strengthen the condensation heat transfer coefficient of the medium outside the pipe, the micro fin structure of the inner wall of the pipe can strengthen the evaporation and heating heat transfer coefficient of the low-temperature medium inside the pipe, and the gasification U-shaped pipe bundle 2.10 is further provided with a spiral ribbon insert, which further strengthens the evaporation and heating heat transfer coefficient of the low-temperature medium inside the pipe. Compared with the bare pipe, the weight of the heat exchange pipe of the high-efficiency gasification U-shaped pipe bundle 2.10 can be reduced by 10% to 40%.

[0052] Application Example 1.

[0053] The application example provides a specific application process of the low-temperature medium gasifier in the embodiment 1, and the specific process is as follows:

[0054] The low-temperature liquid inlet is liquid ethylene at -98℃ and 5.5 MPaG, and the flow rate is 130000 kg / h. The gas outlet is superheated gas at 30℃. The liquid ethylene enters the tube box cylinder from the low-temperature liquid inlet, enters the first tube pass of the gasification U-shaped tube bundle through the tube plate, and gradually warms up and gasifies, and then exits from the second tube pass of the gasification U-shaped tube bundle into the tube box cylinder. The metal surface temperature of the lower half of the tube plate is -98 degrees, and the metal surface temperature of the upper half of the tube plate is 30 degrees, and the temperature difference between the upper and lower metals of the tube plate is 128 degrees, and the welded tube plate can avoid leakage of the medium. The split baffle is "L" shaped, one end is fixed on the tube plate, the other end is fixed on the tube box cylinder, and under the action of the guide plate, the ethylene gas must flow through the lower half of the tube box area to exit from the outlet, so that this part of the area does not form a flow dead zone, and the metal temperature of the upper half of the area of the tube box head 2.4 and the tube box flange 2.5 is equal to the metal temperature of the lower half of the area, the circumferential metal temperature of the flange is uniform, and there is no inconsistent metal deformation, so there is no medium leakage problem, which ensures the supply of the downstream raw materials and the stable operation of the device.

[0055] Comparative Example 1.

[0056] The difference from Application Example 1 is only that the tube plate and the tube box cylinder are connected by a flange, or the tube plate and the shell side equipment flange are connected. Since the temperature difference between the upper and lower metals of the tube plate is 121 degrees, the tube plate and the tube box flange, or the tube plate and the shell side equipment flange are connected by bolts, the thermal expansion and contraction of each part of the sealing surface is different, the deformation amount is different, the pre-tightening force required by the bolt is different, and a large temperature difference stress is generated. In operation, leakage occurs at the gasket sealing place.

[0057] Comparative Example 2.

[0058] The difference from Application Example 1 is only that the split baffle is fixed at one end of the tube plate and at one end of the tube box head.

[0059] At this time, the tube box head is divided into upper and lower parts, the metal temperature of the lower part is the same as that of the low-temperature liquid, and the metal temperature of the upper part is the same as that of the outlet gas.

[0060] As Figure 4As shown, the partition plate is a flat plate structure, fixed at one end to the tube sheet and at the other end to the tube box head 2.4. Filling zone b is filled with a cryogenic liquid medium, with a temperature range of -80 to -120 degrees Celsius. The metal temperature of the lower half of the tube box flange 2.5 and tube box head 2.4 is also between -80 and -120 degrees Celsius. Filling zone c is filled with a heated gaseous medium, with a temperature above 0 degrees Celsius. The metal temperature of the lower half of the tube box flange 2.5 and tube box head 2.4 is also above 0 degrees Celsius. This structure results in a large temperature difference between the tube box flange 2.5 and tube box head 2.4, leading to inconsistent metal deformation and making the gasket sealing area prone to media leakage.

[0061] Comparative Example 3.

[0062] The only difference from Application Example 1 is that there is no baffle in the tube box.

[0063] like Figure 5 As shown, although both the pipe box end cap 2.4 and the pipe box flange are in the gas after vaporization and heating, there is a flow dead zone in the space between the partition plate and the pipe box end cap, as shown in filled area a in the figure. The coldness of the cryogenic liquid is conducted to this part of the gas through the partition plate, causing the temperature of this part of the gas to drop, resulting in a lower metal temperature in the lower half of the pipe box end cap and the pipe box flange. The pipe box end cap and the pipe box flange are connected by bolts. The different thermal expansion and contraction of different parts of the sealing surface result in different deformations, different bolt preloads, and a large thermal stress difference. During operation, leakage occurs at the gasket seal.

[0064] This invention is described in detail through the above embodiments, but it is not limited to these detailed structural features, meaning that the invention cannot be implemented without relying on them. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions for selected components, additions of auxiliary components, and selection of specific methods all fall within the protection and disclosure scope of this invention.

[0065] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0067] In addition, various different embodiments of the present application can be combined arbitrarily, as long as they do not deviate from the spirit of the present application, and should be considered as disclosed by the present application.

[0068] The part not involved in the present application is the same as the prior art or can be realized by using the prior art.

Claims

1. A high-efficiency and safe cryogenic medium vaporizer comprising a housing (1) filled with an intermediate medium for heat exchange, a cryogenic medium vaporization unit (2) and a steam condensation unit (3), characterized in that: The upper end of the shell (1) is provided with an upper cylinder section (1.2), which is connected with the shell side equipment flange (2.9) of the low temperature medium gasification unit (2) through an upper flange (1.3), and the gasification tube bundle of the low temperature medium gasification unit (2) is located in the shell (1); the lower end of the shell (1) is provided with a lower cylinder section (1.5), which is connected with the shell side equipment flange of the steam condensation unit (3) through a lower flange (1.6), and the condensation tube bundle of the steam condensation unit (3) is also located in the shell (1); the heat release of the condensation tube bundle makes the intermediate medium in the shell (1) heat up, the heated intermediate medium exchanges heat with the gasification tube bundle so as to make the liquid in the gasification tube bundle heat up and gasify, and the gasified liquid is discharged to be used by subsequent gas using equipment, and the intermediate medium condenses to become liquid and falls into the area of the steam condensation unit (3) to be gasified again.

2. The efficient and safe cryogenic medium vaporizer of claim 1, wherein: The shell (1) is composed of an intermediate cylinder body (1.1), an upper cylinder section (1.2), an upper flange (1.3), two shell side heads (1.4), a lower cylinder section (1.5) and a lower flange (1.6), the two shell side heads (1.4) are respectively located at the two ends of the intermediate cylinder body (1.1), the upper cylinder section (1.2) is fixed to the upper part of the shell side head at one end and connected with the upper flange (1.3), and the lower cylinder section (1.5) is fixed to the lower part of the other shell side head and connected with the lower flange (1.6).

3. The efficient and safe cryogenic medium vaporizer of claim 1, wherein: The low temperature medium gasification unit (2) comprises a tube sheet (2.1), a low temperature liquid inlet (2.2), a gas outlet (2.7), a shell side equipment flange (2.9), a tube box flange (2.5), a tube box cylinder body (2.8), a tube box head (2.4) and a gasification tube bundle (2.10); the low temperature liquid inlet (2.2) and the gas outlet (2.7) are respectively communicated with the inside of the tube box cylinder body (2.8), the shell side equipment flange (2.9) is connected with the upper flange (1.3), the gasification tube bundle (2.10) is connected with the tube box cylinder body (2.8) through the tube sheet (2.1), the tube box head (2.4) is connected with the tube box flange (2.5), and the tube box cylinder body (2.8) is provided with a split range baffle (2.3).

4. The efficient and safe cryogenic medium vaporizer of claim 3, wherein: The split range baffle (2.3) is in an "L" type structure, one end of which is fixed to the tube sheet (2.1) and the other end of which is fixed to the tube box cylinder body (2.8).

5. The efficient and safe cryogenic medium vaporizer of claim 3, wherein: The tube box cylinder body (2.8) is provided with a guide vane (2.6).

6. The efficient and safe cryogenic medium vaporizer of claim 3, wherein: The tube sheet (2.1) is welded and connected with the tube box cylinder body (2.8) and the shell side equipment flange (2.9).

7. The efficient and safe cryogenic medium vaporizer of claim 3, wherein: The gasification tube bundle (2.10) is in the form of a roughened tube, a finned tube, a high evaporation tube or a high flux tube which strengthens the evaporation outside the tube, or in the form of an inner groove tube or an inner fin tube which strengthens the heat transfer inside the tube, or in the form of an inner wave and outer thread tube or an inner fin and outer thread tube which strengthens the heat transfer inside and outside the tube.

8. The efficient and safe cryogenic medium vaporizer of claim 3, wherein: The gasification tube bundle (2.10) of the low temperature medium gasification unit is inserted with a spiral ribbon.

9. The efficient and safe cryogenic medium vaporizer of claim 1, wherein: The condensation tube bundle of the steam condensation unit (3) is in the form of a finned tube, a T groove tube or a high evaporation tube which strengthens the evaporation outside the tube, or in the form of an inner fin tube which strengthens the heat transfer inside the tube, or in the form of an inner wave and outer thread tube or an inner fin and outer thread tube which strengthens the heat transfer inside and outside the tube.

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