阅读说明：本技术 一种与gs炉相配套的余热回收方法 (Waste heat recovery method matched with GS furnace ) 是由 侯永军 赵俊豪 张洪德 王吉敏 冯超超 陈宝玺 于 2021-10-08 设计创作，主要内容包括：本发明公开了一种与GS炉相配套的余热回收方法,属于余热综合回收利用技术领域,包括以下步骤：S1、将GS炉产出的高温粗煤气通入旋风分离器中；S2、高温粗煤气在旋风分离器中分离出粗煤气中掺杂的灰尘；S3、粗煤气通入立式中压废热回收器中；S4、粗煤气在立式中压废热回收器中产生中压过热蒸汽；S5、中压过热蒸汽通入文丘里洗涤器中产生净煤气；S6、洗涤后的净煤气通入立式低压废热回收器中；S7、净煤气在立式低压废热回收器中产生低压饱和蒸汽；S8、净煤气降温离开立式低压废热回收器。该与GS炉相配套的余热回收方法,通过设置两台废热回收器,不仅提高了换热效率,还满足化工焦改造工艺中含尘工艺气介质的热量回收。(The invention discloses a waste heat recovery method matched with a GS furnace, belonging to the technical field of comprehensive waste heat recovery and utilization, and comprising the following steps of: s1, introducing high-temperature crude gas produced by the GS furnace into a cyclone separator; s2, separating dust mixed in the raw gas from the high-temperature raw gas in a cyclone separator; s3, introducing the raw coal gas into a vertical medium-pressure waste heat recoverer; s4, generating medium-pressure superheated steam in the vertical medium-pressure waste heat recoverer by the raw gas; s5, introducing the medium-pressure superheated steam into the Venturi scrubber to generate clean coal gas; s6, introducing the washed clean coal gas into a vertical low-pressure waste heat recoverer; s7, generating low-pressure saturated steam in the vertical low-pressure waste heat recoverer by using the clean coal gas; and S8, cooling the clean coal gas and leaving the vertical low-pressure waste heat recoverer. According to the waste heat recovery method matched with the GS furnace, two waste heat recoverers are arranged, so that the heat exchange efficiency is improved, and the heat recovery of dust-containing process gas media in the chemical coke modification process is met.)

1. A waste heat recovery method matched with a GS furnace is characterized by comprising the following steps:

s1, introducing high-temperature crude gas produced by the GS furnace into a cyclone separator;

s2, separating dust doped in the raw gas from the high-temperature raw gas in a cyclone separator, and discharging the dust from the cyclone separator;

s3, introducing the raw coal gas discharged from the cyclone separator into a vertical medium-pressure waste heat recoverer;

s4, carrying out primary heat exchange on the raw gas in a vertical medium-pressure waste heat recoverer to generate medium-pressure superheated steam;

s5, introducing the medium-pressure superheated steam into a Venturi scrubber for washing treatment to generate clean coal gas;

s6, introducing the washed clean coal gas into a vertical low-pressure waste heat recoverer;

s7, carrying out secondary heat exchange on the clean coal gas in the vertical low-pressure waste heat recoverer to generate low-pressure saturated steam;

and S8, cooling the clean coal gas to the temperature required by the downstream process, and then leaving the vertical low-pressure waste heat recoverer to enter the next process flow.

2. The method for recovering the waste heat matched with the GS furnace, wherein the cyclone separator, the vertical medium-pressure waste heat recoverer, the vertical low-pressure waste heat recoverer and the Venturi scrubber are all matched equipment of the GS furnace.

3. The waste heat recovery method matched with the GS furnace is characterized in that the cyclone separator adopts a water jacket type separation device.

4. The waste heat recovery method of claim 1, wherein in the step S2, an ash discharge port is formed at the bottom end of the cyclone separator, a raw gas outlet is formed at the top end of the cyclone separator, a raw gas inlet is formed at one side of the cyclone separator, the raw gas inlet receives raw gas from the GS furnace, the cyclone separator discharges doped dust through the ash discharge port, the raw gas outlet conveys the separated raw gas to next process equipment, and the cyclone separator also plays a role in cooling the raw gas in the separation process.

5. The method for recovering waste heat from a GS furnace according to claim 1, wherein in S3, the vertical medium-pressure waste heat recoverer comprises a first evaporation section, a superheating section, a second evaporation section and a medium-pressure boiler feed water preheater, and a forced circulation pump is not arranged in the vertical medium-pressure waste heat recoverer, and a natural circulation steam-water circulation manner is adopted.

6. The waste heat recovery method matched with the GS furnace is characterized in that the vertical type medium-pressure waste heat recoverer is further provided with a steam-water separation space and an ash discharge port, the steam-water separation space is an independent medium-pressure steam drum device, the ash discharge port is arranged at the bottom end of the vertical type medium-pressure waste heat recoverer, and the ash discharge port is used for discharging dust generated in the heat exchange process.

7. The waste heat recovery method matched with the GS furnace, according to the claim 1, wherein in the S4, when the raw gas is subjected to the first heat exchange, the raw gas sequentially enters the first evaporation section, the overheating section, the second evaporation section and the boiler feed water preheater section of the vertical medium-pressure waste heat recoverer for heat exchange.

8. The method for recovering the waste heat of the GS furnace is characterized in that in the step S5, a Venturi washing water inlet is arranged at the top end of the Venturi scrubber, and a Venturi washing water outlet is arranged at the bottom end of the Venturi scrubber, so that the Venturi washing water is used for cleaning medium-pressure superheated steam.

9. The waste heat recovery method matched with the GS furnace is characterized in that the vertical low-pressure waste heat recoverer is provided with a heat exchange section, a steam-water separation space and a low-pressure boiler feed water preheater, the steam-water separation space and the heat exchange section are designed into a whole section, and the vertical low-pressure waste heat recoverer and the vertical medium-pressure waste heat recoverer are both in a shell-and-tube type fire tube structure.

10. The waste heat recovery method matched with the GS furnace is characterized in that a low-pressure saturated steam outlet and a clean gas outlet are arranged at the top end of the vertical low-pressure waste heat recoverer, the low-pressure saturated steam outlet is used for discharging low-pressure saturated steam, and the clean gas outlet is used for conveying cooled clean gas to the next process flow.

Technical Field

The invention belongs to the technical field of comprehensive waste heat recovery and utilization, and particularly relates to a waste heat recovery method matched with a GS furnace.

Background

Along with the increasing scale of coal chemical devices in the jin coal group, attention is paid to the heat recovery of the crude gas gasified by the jin coal GS furnace (namely a crushed coal pressurized gasification furnace), and in the process flow, the crude gas produced from the jin coal GS furnace is cooled by a cyclone separator, a medium-pressure waste heat recoverer and a low-pressure waste heat recoverer and then is sent to a downstream process. The temperature of the raw gas produced from the Jinyi coal GS furnace is about 540-650 ℃, and the temperature needs to be reduced to 160-200 ℃ so as to meet the requirements of downstream processes. If the cooling is carried out by adopting a measure such as chilling, the effect of reducing the temperature can be achieved, but the energy is not fully utilized, and the waste of water resources is caused. The waste heat is utilized to the maximum degree to recover the heat in the raw gas, so that the raw gas is cooled and simultaneously generates low-pressure or medium-pressure superheated steam, which is an ideal choice.

The conventional multi-stage fire tube test flexible thin tube plate waste heat recoverer is generally of a horizontal structure, is not suitable for a dusty process gas medium, and cannot generate superheated steam. For example, chinese patent CN201680350U discloses a large two-stage thin tube plate waste heat recovery device, which is a horizontal fire tube structure, is not suitable for dusty process gas medium, and cannot generate superheated steam.

The conventional waste heat recoverer with a vertical structure, which can generate superheated steam, is generally a water pipe waste heat recoverer or a radiation waste heat recoverer, has low heat exchange efficiency, and is only suitable for being used in a power plant or an IGCC project. For example, chinese patent CN101581446A relates to a convective waste heat recoverer for generating superheated steam, which is a water-tube type waste heat recoverer, suitable for IGCC projects and not suitable for raw gas heat recovery in chemical coke reforming processes.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a waste heat recovery method matched with a GS furnace, and aims to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a waste heat recovery method matched with a GS furnace comprises the following steps:

s1, introducing high-temperature crude gas produced by the GS furnace into a cyclone separator;

s2, separating dust doped in the raw gas from the high-temperature raw gas in a cyclone separator, and discharging the dust from the cyclone separator;

s3, introducing the raw coal gas discharged from the cyclone separator into a vertical medium-pressure waste heat recoverer;

s4, carrying out primary heat exchange on the raw gas in a vertical medium-pressure waste heat recoverer to generate medium-pressure superheated steam;

s5, introducing the medium-pressure superheated steam into a Venturi scrubber for washing treatment to generate clean coal gas;

s6, introducing the washed clean coal gas into a vertical low-pressure waste heat recoverer;

s7, carrying out secondary heat exchange on the clean coal gas in the vertical low-pressure waste heat recoverer to generate low-pressure saturated steam;

and S8, cooling the clean coal gas to the temperature required by the downstream process, and then leaving the vertical low-pressure waste heat recoverer to enter the next process flow.

Further optimizing the technical scheme, the cyclone separator, the vertical medium-pressure waste heat recoverer, the vertical low-pressure waste heat recoverer and the Venturi scrubber are all matched equipment of a GS furnace.

Further optimizes the technical proposal, and the cyclone separator adopts separation equipment with a water jacket type structure.

Further optimizing the technical scheme, in S2, an ash discharge port is formed in the bottom end of the cyclone separator, a raw gas outlet is formed in the top end of the cyclone separator, a raw gas inlet is formed in one side of the cyclone separator, the raw gas inlet receives raw gas from a GS furnace, the cyclone separator discharges doped dust through the ash discharge port, the raw gas outlet conveys the separated raw gas to next process equipment, and the cyclone separator also plays a role in cooling the raw gas in the separation process.

Further optimizing the technical scheme, in S3, the vertical medium-pressure waste heat recoverer includes a first evaporation section, a superheat section, a second evaporation section, and a medium-pressure boiler feed water preheater, and a forced circulation pump is not provided in the vertical medium-pressure waste heat recoverer, and a natural circulation steam-water circulation manner is adopted.

Further optimizing the technical scheme, the vertical medium-pressure waste heat recoverer is further provided with a steam-water separation space and an ash discharge port, the steam-water separation space is independent medium-pressure steam drum equipment, the ash discharge port is arranged at the bottom end of the vertical medium-pressure waste heat recoverer, and the ash discharge port is used for discharging dust generated in the heat exchange process.

Further optimizing the technical scheme, in the step S4, when the raw gas is subjected to the first heat exchange, the raw gas sequentially enters the first evaporation section, the superheating section, the second evaporation section and the boiler feed water preheater section of the vertical medium-pressure waste heat recoverer for heat exchange.

Further optimize this technical scheme, in S5, the top of venturi scrubber is provided with venturi washing water inlet, the bottom of venturi scrubber is provided with venturi washing water outlet for venturi washing water washs the work to middling pressure superheated steam.

Further optimizing the technical scheme, the vertical low-pressure waste heat recoverer is provided with a heat exchange section, a steam-water separation space and a low-pressure boiler feed water preheater, the steam-water separation space and the heat exchange section are designed into a whole section, and the vertical low-pressure waste heat recoverer and the vertical medium-pressure waste heat recoverer are both in tube-type fire tube structures.

Further optimizing the technical scheme, a low-pressure saturated steam outlet and a clean gas outlet are formed in the top end of the vertical low-pressure waste heat recoverer, the low-pressure saturated steam outlet is used for discharging low-pressure saturated steam, and the clean gas outlet is used for conveying cooled clean gas to enter the next process flow.

Compared with the prior art, the invention provides a waste heat recovery method matched with a GS furnace, which has the following beneficial effects:

1. according to the waste heat recovery method matched with the GS furnace, two waste heat recoverers are arranged, the vertical type medium-pressure waste heat recoverer is designed in a four-section mode, and the vertical type low-pressure waste heat recoverer is designed in a one-section mode.

2. According to the waste heat recovery method matched with the GS furnace, the Venturi scrubber is additionally arranged between the vertical type middle-pressure waste heat recoverer and the vertical type low-pressure waste heat recoverer, so that the cleanness degree of crude gas is ensured, and the problem of blockage of subsequent equipment is avoided.

Drawings

FIG. 1 is a schematic flow diagram of a waste heat recovery method associated with a GS furnace according to the present invention;

FIG. 2 is a schematic structural diagram of a cyclone separator in the waste heat recovery method matched with the GS furnace, which is provided by the invention;

FIG. 3 is a schematic structural view of a vertical medium-pressure waste heat recoverer in the waste heat recovery method matched with a GS furnace, provided by the invention;

FIG. 4 is a schematic structural diagram of a Venturi scrubber in the waste heat recovery method matched with the GS furnace, which is provided by the invention;

fig. 5 is a schematic structural diagram of a vertical low-pressure waste heat recoverer in the waste heat recovery method matched with the GS furnace.

In the figure: 1. a GS furnace; 2. a cyclone separator; 21. a raw gas inlet; 22. an ash discharge port; 23. a raw gas outlet; 3. a vertical medium pressure waste heat recoverer; 31. a first evaporation section; 32. a superheating section; 33. a second evaporation section; 34. a feed water preheater of the medium-pressure boiler; 35. a vapor-water separation space; 36. an ash discharge port; 4. a venturi scrubber; 41. a venturi wash water inlet; 42. a venturi wash water outlet; 5. a vertical low-pressure waste heat recoverer; 51. a low-pressure saturated steam outlet; 52. a clean gas outlet; 53. a heat exchange section; 54. a feed water preheater of a low-pressure boiler.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

referring to fig. 1, a waste heat recovery method matched with a GS furnace includes the following steps:

s1, introducing high-temperature crude gas produced by the GS furnace 1 into a cyclone separator 2;

s2, separating dust mixed in the raw gas from the high-temperature raw gas in the cyclone separator 2, and discharging the dust from the cyclone separator 2;

s3, introducing the raw coal gas discharged from the cyclone separator 2 into a vertical medium-pressure waste heat recoverer 3;

s4, carrying out primary heat exchange on the raw gas in the vertical medium-pressure waste heat recoverer 3 to generate medium-pressure superheated steam;

s5, introducing the medium-pressure superheated steam into the Venturi scrubber 4 for washing treatment to generate clean coal gas;

s6, introducing the washed clean coal gas into a vertical low-pressure waste heat recoverer 5;

s7, carrying out secondary heat exchange on the clean coal gas in the vertical low-pressure waste heat recoverer 5 to generate low-pressure saturated steam;

and S8, cooling the clean coal gas to the temperature required by the downstream process, and then leaving the vertical low-pressure waste heat recoverer 5 to enter the next process flow.

Specifically, the cyclone separator 2, the vertical medium-pressure waste heat recoverer 3, the vertical low-pressure waste heat recoverer 5 and the venturi scrubber 4 are all matched equipment of the GS furnace 1.

As shown in fig. 2, specifically, the cyclone separator 2 is a separation device with a water jacket structure, in S2, an ash discharge port 22 is arranged at the bottom end of the cyclone separator 2, a raw gas outlet 23 is arranged at the top end of the cyclone separator 2, a raw gas inlet 21 is arranged at one side of the cyclone separator 2, the raw gas inlet 21 receives raw gas from the GS furnace 1, the cyclone separator 2 discharges doped dust through the ash discharge port 22, the raw gas outlet 23 conveys the separated raw gas to a next process device, and the cyclone separator 2 also plays a role in cooling the raw gas in the separation process.

As shown in fig. 3, specifically, in S3, the vertical intermediate-pressure waste heat recovery device 3 includes a first evaporation section 31, a superheating section 32, a second evaporation section 33, and an intermediate-pressure boiler feed water preheater 34, and the vertical intermediate-pressure waste heat recovery device 3 employs a natural circulation steam-water circulation method without a forced circulation pump.

Specifically, the vertical medium-pressure waste heat recoverer 3 is further provided with a steam-water separation space 35 and an ash discharge port 36, the steam-water separation space 35 is independent medium-pressure steam drum equipment, the water flow direction of the medium-pressure steam drum equipment is shown by an arrow in fig. 1, the ash discharge port 22 is arranged at the bottom end of the vertical medium-pressure waste heat recoverer 3, and the ash discharge port 36 is used for discharging dust generated in the heat exchange process.

Specifically, in S4, when the raw gas is subjected to the first heat exchange, the raw gas sequentially enters the first evaporation section 31, the superheating section 32, the second evaporation section 33, and the medium-pressure boiler feed water preheater 34 of the vertical medium-pressure waste heat recoverer 3 to perform heat exchange.

As shown in fig. 4, in step S5, a venturi washing water inlet 41 is disposed at a top end of the venturi scrubber 4, and a venturi washing water outlet 42 is disposed at a bottom end of the venturi scrubber 4, so that the venturi washing water cleans the medium-pressure superheated steam.

As shown in fig. 5, specifically, the vertical low-pressure waste heat recoverer 5 is provided with a heat exchange section 53, a steam-water separation space and a low-pressure boiler feed water preheater 54, the steam-water separation space and the heat exchange section 53 are designed into a single section, and the vertical low-pressure waste heat recoverer 5 and the vertical medium-pressure waste heat recoverer 3 are both in a shell-and-tube type fire tube structure.

Specifically, the top end of the vertical low-pressure waste heat recoverer 5 is provided with a low-pressure saturated steam outlet 51 and a clean gas outlet 52, the low-pressure saturated steam outlet 51 is used for discharging low-pressure saturated steam, and the clean gas outlet 52 is used for conveying cooled clean gas to enter the next process flow.

The invention has the beneficial effects that:

1. according to the waste heat recovery method matched with the GS furnace, two waste heat recoverers are arranged, the vertical type medium-pressure waste heat recoverer is designed in a four-section mode, and the vertical type low-pressure waste heat recoverer is designed in a one-section mode.

2. According to the waste heat recovery method matched with the GS furnace, the Venturi scrubber is additionally arranged between the vertical type middle-pressure waste heat recoverer and the vertical type low-pressure waste heat recoverer, so that the cleanness degree of crude gas is ensured, and the problem of blockage of subsequent equipment is avoided.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.