CN217051932U

CN217051932U - Flash evaporation condensate treatment device and system

Info

Publication number: CN217051932U
Application number: CN202220192340.9U
Authority: CN
Inventors: 王国梁; 李俊挺; 董先营; 赵元琪; 陈德云; 何鹏; 曹文龙; 陈其虎; 张博; 方军
Original assignee: National Energy Group Ningxia Coal Industry Co Ltd
Current assignee: National Energy Group Ningxia Coal Industry Co Ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-07-26
Anticipated expiration: 2032-01-24

Abstract

The utility model relates to a dry coal powder gasification technical field discloses a flash distillation condensate processing apparatus and system. The flash evaporation condensate treatment device comprises a first settling pipeline, a first circulating water pipeline, a second settling pipeline and a second circulating water pipeline, wherein one end of the first settling pipeline is communicated with the first flash evaporation device, and the other end of the first settling pipeline is communicated with the settling tank; one end of the first circulating water pipeline is communicated with the first flash device, and the other end of the first circulating water pipeline is communicated with the circulating water tank; one end of the second settling pipeline is communicated with the second flash evaporation device, and the other end of the second settling pipeline is communicated with the settling tank; one end of the second circulating water pipeline is communicated with the second flash evaporation device, and the other end of the second circulating water pipeline is communicated with the circulating water tank. The system comprises at least one set of the flash condensate treatment device. The utility model discloses can avoid the phenomenon that the mixture of the condensate of different pressure leads to unusual operating mode to take place, ensure simultaneously that the quality of water among the circulating line satisfies the user demand, and need not to shut down when the overhaul of the equipments, increase work efficiency.

Description

Flash evaporation condensate treatment device and system

Technical Field

The utility model relates to a dry pulverized coal gasification technical field specifically relates to a flash distillation condensate processing apparatus and system.

Background

The dry coal powder pressurizing, downward chilling and membrane wall gasification process technology becomes the mainstream development direction of the modern coal gasification technology due to the characteristics of wide application range of coal types, low requirement on ash content of coal and the like. The black water flash evaporation unit is an important unit in the gasification device, black water generated by a chilling chamber of the gasification furnace and a synthetic gas washing tower is subjected to three-stage flash evaporation, pressure reduction and temperature reduction and then is sent to a downstream black water treatment process, noncondensable gas cooled and separated by flash evaporation acid gas is sent to a sulfur recovery device, and condensate cooled and separated by the flash evaporation acid gas is sent to a circulating water tank. Because the condensate of the third-stage flash evaporation directly enters the circulating water tank, the water quality of the circulating water tank directly influences the water quality of the whole system. At present, three-level flash evaporation condensate of a dry pulverized coal gasification device is converged to a main pipe and then is discharged to a circulating water tank, and the design mode has the following defects:

(1) the three stages of flash evaporation have different pressures, the condensate pressures of the three stages of flash evaporation are different and are converged into a main pipe, and abnormal working conditions which are mutually restricted and influenced exist;

(2) the three-stage flash evaporation condensate carries fine ash particles, and the water quality of the system is influenced after the fine ash particles are discharged to the circulating water tank.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the utility model provides a flash distillation condensate processing apparatus and system.

The utility model provides a flash distillation condensate processing apparatus, flash distillation condensate processing apparatus includes:

one end of the first settling pipeline is communicated with a condensate outlet of the first flash device, the other end of the first settling pipeline is communicated with the settling tank, and a first valve is arranged on the first settling pipeline;

one end of the first circulating water pipeline is used for being communicated with a condensate outlet of the first flash device, the other end of the first circulating water pipeline is used for being communicated with a circulating water tank, and a second valve is arranged on the first circulating water pipeline;

one end of the second settling pipeline is communicated with a condensate outlet of the second flash evaporation device, the other end of the second settling pipeline is communicated with the settling tank, and a third valve is arranged on the second settling pipeline; and

and one end of the second circulating water pipeline is communicated with a condensate outlet of the second flash evaporation device, the other end of the second circulating water pipeline is communicated with a circulating water tank, and a fourth valve is arranged on the second circulating water pipeline.

Optionally, the operating pressure of the second flash apparatus is greater than the operating pressure of the first flash apparatus.

Optionally, the first flash device comprises a low-pressure flash tank and a medium-pressure flash tank, and the condensate outlets of the low-pressure flash tank and the medium-pressure flash tank are both communicated with the first settling pipe and the first circulating water pipe.

Optionally, a plurality of low-pressure flash tanks are provided, a condensate outlet of each low-pressure flash tank is connected with a first pipeline, and outlets of the plurality of first pipelines are communicated with the first settling pipeline and the first circulating water pipeline;

the medium-pressure flash tank is multiple, a condensate outlet of the medium-pressure flash tank is connected with a second pipeline, and outlets of the second pipeline are communicated with the first settling pipeline and the first circulating water pipeline.

Optionally, the second flash device is a vacuum flash tank, and a condensate outlet of the vacuum flash tank is communicated with the second settling pipeline and the second circulating water pipeline.

Optionally, the number of the vacuum flash tanks is multiple, a condensate outlet of the vacuum flash tank is connected with a third pipeline, and outlets of the third pipelines are communicated with the second settling pipeline and the second circulating water pipeline.

Optionally, a liquid level regulating valve for controlling the flow of the condensate and a cut-off valve for controlling the on-off of the condensate are arranged on the third pipeline.

Optionally, a bypass pipeline is further arranged between a condensate outlet of the vacuum flash tank and the second circulating water pipeline, a bypass valve for controlling circulation of condensate is arranged on the bypass pipeline, and the bypass valve is connected in parallel with the fourth valve.

The utility model also provides a flash distillation condensate processing system, including one set of above-mentioned flash distillation condensate processing apparatus at least.

Optionally, the number of the flash evaporation condensate treatment devices is two, the first circulating water pipelines of the two flash evaporation condensate treatment devices are communicated through a fourth pipeline, and a fifth valve is arranged on the fourth pipeline.

Compared with the prior art, the technical scheme provided by the utility model has the following advantage:

the utility model respectively leads out the condensate of the first flash evaporation device and the condensate of the second flash evaporation device through the first circulating water pipeline, the first settling pipeline, the second settling pipeline and the second circulating water pipeline, avoids the phenomenon of abnormal working conditions caused by the mixing of the condensates with different pressures, in addition, when the device is normally used, the second valve and the fourth valve are closed, the first valve and the third valve are opened, the condensate enters the settling tank for settling and then enters the circulating water tank, the water quality in the circulating pipeline is ensured to meet the use requirement, and when the settling tank is overhauled, the first valve and the third valve are closed, the second valve and the fourth valve are opened, the condensate directly enters the circulating water tank, because the condensate that enters into the circulating water tank is less, consequently, the quality of water of entire system can not influenced by trace impurity, ensures that entire system lasts the operation, increases work efficiency.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic diagram of a flash evaporation condensate treatment device according to an embodiment of the present invention.

Description of the reference numerals

1. A first settling conduit; 11. a first valve; 2. a settling tank; 3. a first circulating water pipeline; 31. a second valve; 4. a circulating water tank; 5. a second settling conduit; 51. a third valve; 6. a second circulating water pipeline; 61. a fourth valve; 7. a low-pressure flash tank; 701. a first conduit; 71. medium-pressure flash tank; 711. a second pipe; 72. a vacuum flash tank; 721. a third pipeline; 722. a liquid level regulating valve; 723. a shut-off valve; 8. a bypass conduit; 81. a bypass valve; 9. a fourth conduit; 91. and a fifth valve.

Detailed Description

In order that the above objects, features and advantages of the present invention may be more clearly understood, aspects of the present invention will be further described below. In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the invention may be practiced in other ways than those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, and not all of the embodiments.

As shown in fig. 1, the embodiment of the present invention provides a flash evaporation condensate treatment device comprising a first settling pipe 1, a first circulating water pipe 3, a second settling pipe 5 and a second circulating water pipe 6.

One end of the first settling pipeline 1 is used for being communicated with a condensate outlet of the first flash device, the other end of the first settling pipeline 1 is used for being communicated with the settling tank 2, a first valve 11 is arranged on the first settling pipeline 1, and the first settling pipeline 1 is controlled to be opened or closed through the first valve 11 to be switched on or off. One end of the first circulating water pipeline 3 is used for being communicated with a condensate outlet of the first flash device, the other end of the first circulating water pipeline 3 is used for being communicated with a circulating water tank 4, a second valve 31 is arranged on the first circulating water pipeline 3, and the second settling pipeline 5 is controlled to be opened or closed through the second valve 31. Specifically, can set up three way connection in first flash device's condensate outlet department, three way connection's one end and condensate outlet intercommunication, three way connection's two exports respectively with first settling tube 1 and first circulating water pipeline 3 intercommunication for in the condensate of discharging through first flash device can enter into first settling tube 1 and first circulating water pipeline 3, and the on-off control condensate through controlling first valve 11 and second valve 31 enters into subsider 2 or circulation water pitcher 4.

One end of the second settling pipeline 5 is used for being communicated with a condensate outlet of the second flash evaporation device, the other end of the second settling pipeline 5 is used for being communicated with the settling tank 2, a third valve 51 is arranged on the second settling pipeline 5, and the on-off of the second settling pipeline 5 is controlled by opening or closing the third valve 51. One end of the second circulating water pipeline 6 is used for being communicated with a condensate outlet of the second flash evaporation device, the other end of the second circulating water pipeline 6 is used for being communicated with the circulating water tank 4, a fourth valve 61 is arranged on the second circulating water pipeline 6, and the second circulating water pipeline 6 is controlled to be opened or closed through the fourth valve 61 to be switched on or switched off. Specifically, a tee joint may be disposed at a condensate outlet of the second flash evaporation device, one end of the tee joint is communicated with the condensate outlet of the second flash evaporation device, and two outlets of the tee joint are respectively communicated with the second settling pipeline 5 and the second circulating water pipeline 6, so that the condensate discharged from the second flash evaporation device can enter the second settling pipeline 5 and the second circulating water pipeline 6, and the condensate is controlled to enter the settling tank 2 or the circulating water tank 4 by controlling on/off of the third valve 51 and the fourth valve 61. Wherein the working pressure of the second flash device is greater than the working pressure of the first flash device.

The utility model discloses a condensate of first flash distillation device and second flash distillation device is drawn forth respectively to first circulating water pipeline 3, first settlement pipeline 1 and second settlement pipeline 5, second circulating water pipeline 6, avoid the phenomenon of the mixture of the condensate of different pressures to lead to unusual operating mode to take place, and, when normally using, second valve 31 and fourth valve 61 are closed, first valve 11 and third valve 51 are opened, the condensate enters into subsider 2 and subsides the back, reentry circulating water tank 4, namely the tube coupling between subsider 2 and the circulating water tank 4, make the condensate after the settlement process flow to circulating water tank 4, guarantee that the quality of water in the circulating line satisfies the user demand, and, when subsider 2 overhauls, first valve 11 and third valve 51 are closed, second valve 31 and fourth valve 61 are opened, the condensate directly enters circulating water tank 4, because the condensate entering the circulating water tank 4 is less, the water quality of the whole system cannot be influenced by trace impurities, the continuous operation of the whole system is ensured, and the working efficiency is increased.

As shown in fig. 1, the first flash unit comprises a low-pressure flash tank 7 and a medium-pressure flash tank 71, and the condensate outlets of the low-pressure flash tank 7 and the medium-pressure flash tank 71 are both communicated with the first settling pipe 1 and the first circulating water pipe 3. The low-pressure flash tank 7 and the medium-pressure flash tank 71 are conventional components of flash technology, and both the low pressure and the medium pressure are conventional components in the industry in terms of the working pressure of the flash tank, and therefore, are not described herein too much. Because the pressure difference of the condensate discharged from the low-pressure flash tank 7 and the medium-pressure flash tank 71 is not very large, abnormal working conditions can not be caused due to the pressure difference after mixing, and therefore the condensate discharged from the low-pressure flash tank 7 and the medium-pressure flash tank 71 can be gathered in the first settling pipeline 1 and the first circulating water pipeline 3, the arrangement of lines is reduced, and the difficulty of line arrangement and maintenance is reduced.

Further optimally, the number of the low-pressure flash tanks 7 is multiple, the condensate outlets of the low-pressure flash tanks 7 are connected with the first pipelines 701, and the outlets of the multiple first pipelines 701 are communicated with the first settling pipeline 1 and the first circulating water pipeline 3. Specifically, the export of first pipeline 701 is connected through first many joints, and the export of a plurality of first pipelines 701 and the entry intercommunication of first many joints, the export of first many joints are two, and the export of two first many joints communicates with the entry of first settlement pipeline 1 and first circulating water pipeline 3 respectively.

The number of the medium-pressure flash tanks 71 is multiple, the condensate outlets of the medium-pressure flash tanks 71 are connected with second pipelines 711, and the outlets of the second pipelines 711 are communicated with the first settling pipeline 1 and the first circulating water pipeline 3. Specifically, the outlet of the second pipeline 711 is connected through a second multi-way joint, the outlets of the second pipelines 711 are communicated with the inlet of the second multi-way joint, the outlets of the second multi-way joint are two, and the outlets of the two second multi-way joints are respectively communicated with the inlets of the first settling pipeline 1 and the first circulating water pipeline 3.

Further optimally, in order to enable condensate discharged through the low-pressure flash tank 7 and the medium-pressure flash tank 71 to enter the first settling pipe 1 and the first circulating water pipe 3 and to enable the inlet ends of the first settling pipe 1 and the first circulating water pipe 3 to be communicated with each other, a four-way joint may be connected at the outlet ends of the first multi-way joint and the second multi-way joint, wherein the four-way joint has two inlets and two outlets, the two inlets of the four-way joint are respectively communicated with the outlets of the first multi-way joint and the second multi-way joint, and the two outlets of the four-way joint are respectively communicated with the inlets of the first settling pipe 1 and the first circulating water pipe 3. Or the outlet ends of the first multi-way joint and the second multi-way joint can be connected with a transfer pipeline, namely condensate discharged from the low-pressure flash tank 7 and the medium-pressure flash tank 71 enters the transfer pipeline, the outlet end of the transfer pipeline is connected with a three-way joint, two outlets of the three-way joint are respectively communicated with the inlets of the first settling pipeline 1 and the first circulating water pipeline 3, and the pipeline arrangement of the design mode is reasonable, so that the pipeline is simplified.

As shown in fig. 1, the second flash device is a vacuum flash tank 72, and a condensate outlet of the vacuum flash tank 72 is communicated with the second settling pipe 5 and the second circulating water pipe 6. The vacuum flash tank 72 is a conventional part of flash technology, and therefore, will not be described herein. Preferably, there are a plurality of vacuum flash tanks 72, the condensate outlet of the vacuum flash tank 72 is connected to a third pipe 721, and the outlets of the plurality of third pipes 721 are all communicated with the second settling pipe 5 and the second circulating water pipe 6. Specifically, outlets of the third pipes 721 are connected by a third multi-way joint, outlets of the plurality of third pipes 721 are communicated with inlets of the third multi-way joint, two outlets of the third multi-way joint are provided, and outlets of the two third multi-way joints are respectively communicated with inlets of the second settling pipe 5 and the second circulating water pipe 6, so that the pipelines are simplified.

Further optimally, in order to avoid the liquid phase in the vacuum flash tank 72 from being drained, a liquid level regulating valve 722 for controlling the flow rate of the condensate and a shut-off valve 723 for controlling the on-off of the condensate are arranged on the third pipe 721, the discharge flow rate of the condensate of the vacuum flash tank 72 is controlled by regulating the opening degree of the liquid level regulating valve 722, and when the liquid phase in the vacuum flash tank 72 is too low, the third pipe 721 can also be shut off by the shut-off valve 723, so that the condensate in the vacuum flash tank 72 is prevented from being drained outside, and the use safety of the vacuum flash tank 72 is ensured.

Preferably, a bypass pipeline 8 is further arranged between the condensate outlet of the vacuum flash tank 72 and the second circulating water pipeline 6, a bypass valve 81 for controlling the circulation of the condensate is arranged on the bypass pipeline 8, the bypass valve 81 is connected with the fourth valve 61 in parallel, that is, the outlet of the bypass pipeline 8 is arranged at one side of the outlet of the fourth valve 61 facing the flowing direction of the condensate. Specifically, when the liquid level regulating valve 722 malfunctions, the shut-off valve 723 cuts off the third pipe 721, and at the same time, the bypass valve 81 is opened, so that condensate can flow to the second circulating water pipe 6 through the bypass pipe 8, maintenance shutdown is avoided, and work efficiency is ensured.

The utility model also provides a flash distillation condensate processing system, including one set of above-mentioned flash distillation condensate processing apparatus at least, this department flash distillation condensate processing apparatus includes above-mentioned flash distillation condensate processing apparatus's whole technical characteristic, consequently, does not do too much description here.

As shown in fig. 1, there are two sets of flash evaporation condensate treatment devices, the first circulating water pipes 3 of the two sets of flash evaporation condensate treatment devices are communicated with each other through a fourth pipe 9, and a fifth valve 91 is arranged on the fourth pipe 9. When the circulating water tank 4 and the settling tank 2 of one set of the flash evaporation condensate treatment device need to be maintained, the condensate of the set of the flash evaporation condensate treatment device can flow to the circulating water tank 4 or the settling tank 2 of the other set of the flash evaporation condensate treatment device by opening the fifth valve 91.

Specifically, taking the embodiment shown in fig. 1 as an example, the vapor condensate treatment device at the lower part is a first set of vapor condensate treatment device, and the vapor condensate treatment device at the upper part is a second set of vapor condensate treatment device. When the circulation water tank 4 and the settling tank 2 in the first set of steam condensate treatment device are both required to be maintained, the fifth valve 91 is opened, and at the moment, condensate discharged by the first flash device (the low-pressure flash tank 7 and the medium-pressure flash tank 71) flows to the first circulation water pipe of the second set of steam condensate treatment device through the first circulation water pipe 3 of the first set of steam condensate treatment device, and then flows to the circulation water tank 4. Alternatively, the fifth valve 91 is opened, the second valve 31 of the second jacket steam condensate treatment device is closed, the first valve 11 is opened, and since the inlet end of the second jacket steam condensate treatment device is in communication with the inlet end of the first recirculation water conduit 3, the condensate will flow through the first recirculation water conduit 3 to the first settling conduit 1 and into the settling tank 2 of the second jacket steam condensate treatment device. Similarly, because the export of first circulating water pipeline 3 and second circulating water pipeline 6 all with circulation water tank 4 entry intercommunication, consequently, the export intercommunication of first circulating water pipeline 3 and second circulating water pipeline 6, concrete accessible three way connection realizes, consequently, the exhaust condensate of second flash distillation device accessible second circulating water pipeline 6 flows to first circulating water pipeline 3, and then flows to the second set of flash distillation condensate processing apparatus. The design mode enables the two sets of flash evaporation condensate treatment devices to be standby mutually, so that the whole system can normally run under the condition that the circulating water tank 4 and the sedimentation tank 2 of the same set of flash evaporation condensate treatment device are maintained simultaneously, and the working efficiency is ensured.

It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above description is merely illustrative of the invention and is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flash condensate treatment apparatus, comprising:

one end of the first settling pipeline (1) is used for being communicated with a condensate outlet of the first flash device, the other end of the first settling pipeline (1) is used for being communicated with the settling tank (2), and a first valve (11) is arranged on the first settling pipeline (1);

one end of the first circulating water pipeline (3) is used for being communicated with a condensate outlet of the first flash device, the other end of the first circulating water pipeline is used for being communicated with a circulating water tank (4), and a second valve (31) is arranged on the first circulating water pipeline (3);

one end of the second settling pipeline (5) is used for being communicated with a condensate outlet of the second flash evaporation device, the other end of the second settling pipeline (5) is used for being communicated with the settling tank (2), and a third valve (51) is arranged on the second settling pipeline (5); and

and one end of the second circulating water pipeline (6) is communicated with a condensate outlet of the second flash evaporation device, the other end of the second circulating water pipeline is communicated with the circulating water tank (4), and a fourth valve (61) is arranged on the second circulating water pipeline (6).

2. A flash condensate treatment apparatus according to claim 1, wherein the operating pressure of the second flash apparatus is greater than the operating pressure of the first flash apparatus.

3. A flash condensate treatment apparatus according to claim 1, wherein the first flash apparatus comprises a low-pressure flash tank (7) and an intermediate-pressure flash tank (71), the condensate outlets of the low-pressure flash tank (7) and the intermediate-pressure flash tank (71) both communicating with the first settling conduit (1) and the first circulation water conduit (3).

4. A flash condensate treatment apparatus as claimed in claim 3,

the number of the low-pressure flash tanks (7) is multiple, a condensate outlet of the low-pressure flash tanks (7) is connected with a first pipeline (701), and outlets of the multiple first pipelines (701) are communicated with the first settling pipeline (1) and the first circulating water pipeline (3);

the medium-pressure flash tanks (71) are multiple, condensate outlets of the medium-pressure flash tanks (71) are connected with second pipelines (711), and outlets of the second pipelines (711) are communicated with the first settling pipeline (1) and the first circulating water pipeline (3).

5. A flash condensate treatment apparatus according to claim 1, wherein the second flash apparatus is a vacuum flash tank (72), a condensate outlet of the vacuum flash tank (72) being in communication with the second settling conduit (5) and the second recycle water conduit (6).

6. A flash condensate treatment apparatus according to claim 5, wherein there are a plurality of the vacuum flash tanks (72), the condensate outlet of the vacuum flash tanks (72) being connected to a third conduit (721), the outlets of the plurality of third conduits (721) each communicating with the second settling conduit (5) and the second recycle water conduit (6).

7. A flash condensate treatment apparatus according to claim 6, characterised in that the third conduit (721) is provided with a level control valve (722) for controlling the flow of condensate and a shut-off valve (723) for controlling the make-and-break of condensate.

8. A flash condensate treatment apparatus according to claim 7, wherein a bypass conduit (8) is further provided between the condensate outlet of the vacuum flash tank (72) and the second circulation water conduit (6), wherein a bypass valve (81) for controlling the circulation of condensate is provided on the bypass conduit (8), and wherein the bypass valve (81) is connected in parallel with the fourth valve (61).

9. A flash condensate treatment system comprising at least one set of flash condensate treatment apparatus according to any one of claims 1 to 8.

10. A flash condensate treatment system according to claim 9, wherein there are two sets of flash condensate treatment devices, the first circulating water pipes (3) of the two sets of flash condensate treatment devices are communicated with each other through a fourth pipe (9), and a fifth valve (91) is arranged on the fourth pipe (9).