Black water flash tank and black water flash system capable of preventing entrainment

Abstract

The utility model relates to the technical field of coal gasification preparation, in particular to a black water flash evaporation system capable of preventing entrainment, which is characterized in that a flash evaporation tank body and a demisting component are arranged in a black water flash evaporation tank capable of preventing entrainment; the demisting assembly is mounted in the flash tank body and is used for intercepting black water contained in flash steam, solid particles contained in the flash steam and other dissolved matters contained in the flash steam; thus, solid particles carried in the flash steam are intercepted through the demister assembly, black water contained in the flash steam, the solid particles contained in the flash steam and other dissolved substances are prevented from entering a heat exchanger, a pipeline and the like in a follow-up system along with the flash steam, and therefore the problems of blockage, serious scaling and the like generated in the heat exchanger and the pipeline in the follow-up system are solved; the maintenance frequency of a related system related to flash steam of a black water flash evaporation system of the gasification device is reduced, and the working efficiency of heat exchange equipment is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal gasification preparation technical field especially relates to a black water flash system of preventing entrainment of mist. BACKGROUND

[0002] Modern coal chemical industry gasification process generally adopts coal water slurry gasifier or pulverized coal gasifier, wherein the quenching water of the gasifier and the washing water of the washing tower adopt three-stage flash evaporation + gas stripping process, which can effectively recover system heat, and the grey water is recycled and used after settlement and filtration treatment. The main process of three-stage flash evaporation is that the quenching water of the gasifier and the washing water of the washing tower are first flashed in a high-pressure flash tank, the flash steam is sent to a gas stripping tower to contact and exchange heat with the grey water from an oxygen removal water pump, the grey water is stripped and preheated twice, and the heat is recovered. The bottom liquid of the high-pressure flash tank is sent to an atmospheric flash tank for flashing, the flash steam is sent to a deaerator to replace part of 0.5 MPa low-pressure steam to deaerate and preheat the grey water from a grey water tank and the desalted water (or recycled water) supplemented into the system, and the low-grade heat energy in the system is recovered.

[0003] However, a large amount of solid content particles are carried in the flash steam, which can cause problems such as blockage and serious fouling of heat exchangers and pipelines in the subsequent system, resulting in frequent maintenance of the black water flash system of the gasification device related to the flash steam, gradual reduction of the efficiency of the heat exchange equipment, and the like. UTILITY MODEL CONTENTS

[0004] Therefore, it is necessary to provide a black water flash tank and a black water flash system capable of intercepting solid content particles carried in flash steam, thereby reducing problems in heat exchangers and pipelines in the subsequent system, reducing the maintenance frequency of the black water flash system of the gasification device related to the flash steam, and ensuring the working efficiency of the heat exchange equipment.

[0005] In a first aspect, the utility model provides a black water flash tank capable of preventing entrainment of mist, which comprises a flash tank body and a demisting assembly; the demisting assembly is installed inside the flash tank body and used for intercepting black water contained in flash steam and solid content particles and other dissolved substances contained therein.

[0006] Preferably, the demisting assembly is a horizontal installation type demister installed in the flash tank or a vertical installation type demister installed on the outlet pipe of the flash steam.

[0007] Preferably, the demister comprises flat baffle plates and a plurality of cleaning nozzles used for cleaning the baffle plates, the flat baffle plates are uniformly arranged along the vertical direction of the flash steam flow, and the spray ends of the cleaning nozzles used for cleaning the baffle plates are all directed towards the flat baffle plates to flush the flat baffle plates.

[0008] Preferably, according to the size of the flash tank, it is divided into several cleaning areas, and is regularly and quantitatively cleaned by flushing water. The flushing water pipeline is provided with corresponding electromagnetic valves on the branch pipelines before the cleaning nozzles of the cleaning baffle plates. These electromagnetic valves are opened or closed according to the set flushing program, and are used for regularly flushing according to the set flushing program. The flushing water can be gasification ash water or other process water, so as to prevent the solid matters from being adhered to the flat baffle plates and affecting the demisting effect.

[0009] In the second aspect, the utility model provides a kind of black water flash tank of preventing entrainment of mist, which is prevented from entraining mist, comprising high-pressure flash tank, atmospheric pressure flash tank and vacuum flash tank, the liquid inlet end of the high-pressure flash tank is used to receive the gasification black water from carbon washing tower or generated from gasification furnace, and the liquid outlet end at the bottom of high-pressure flash tank is connected with the liquid inlet end of the atmospheric pressure flash tank, and the bottom of atmospheric pressure flash tank is connected with the liquid inlet end of vacuum flash tank;At least one flash tank in the flash tank involved in the above-mentioned flash system is the black water flash tank of preventing entrainment of mist as described in the first aspect.

[0010] Preferably, the black water flash system of preventing entrainment of mist further comprises at least one fourth flash tank, which is arranged on any pipeline before or after the high-pressure flash tank, the atmospheric pressure flash tank and the vacuum flash tank, and is used to utilize the heat of the black water flash system;The fourth flash tank is an ordinary flash tank or the black water flash tank of preventing entrainment of mist as described in the first aspect.

[0011] Preferably, the fourth flash tank is a medium-pressure flash tank, the bottom of the high-pressure flash tank is connected with the medium-pressure flash tank, and the liquid outlet end at the bottom of the medium-pressure flash tank is connected with the liquid inlet end of the atmospheric pressure flash tank.

[0012] The black water flash tank of preventing entrainment of mist is provided with a flash tank body and a demisting assembly;The demisting assembly is installed inside the flash tank body, and is used to intercept the black water contained in the flash steam and the solid content particles and other dissolved matters contained therein;In this way, by intercepting the solid content particles carried in the flash steam through the demisting assembly, the black water contained in the flash steam and the solid content particles and other dissolved matters contained therein are prevented from entering the heat exchanger and the pipeline in the subsequent system along with the flash steam, so as to reduce the problems of blockage and serious fouling generated in the heat exchanger and the pipeline in the subsequent system, reduce the maintenance frequency of the related system of the flash steam of the black water flash system of the gasification device, and ensure the working efficiency of the heat exchange equipment. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic view of the black water flash tank of preventing entrainment of mist of the present application.

[0014] Figure 2 It is a sectional view of the demisting assembly of the present application.

[0015] Figure 3is the black water flash system of the present application Figure 2 A local enlarged view of the middle A region.

[0016] Figure 4 is the black water flash system of the present application

[0017] Figure: black water flash tank 10, flash tank body 20, demister assembly 30, flat baffle 31, cleaning nozzle 32 for cleaning baffle, black water flash system 40, high pressure flash tank 41, atmospheric flash tank 42, vacuum flash tank 43. DETAILED DESCRIPTION

[0018] The technical scheme and technical effects of the embodiments of the present application are further described in detail below in combination with the drawings of the present application.

[0019] Please refer to Figure 1 , the first aspect, the utility model provides a kind of black water flash tank 10 of preventing entrainment of mist, including flash tank body 20 and demister assembly 30;Demister assembly 30 is installed in the inside of flash tank body 20, specifically, demister assembly 30 is located at the top inside the flash tank body 20, for intercepting black water contained in flash steam and contained solid content particles and other dissolved substances;In this way, by demister assembly intercepting solid content particles carried in flash steam, prevent black water contained in flash steam and contained solid content particles and other dissolved substances with flash steam enter subsequent system such as heat exchanger and pipeline, to reduce the frequency of maintenance of heat exchanger and pipeline in subsequent system, reduce the working efficiency of heat exchange equipment.

[0020] In the present embodiment, the flash tank body 20 is a flash tank capable of performing black water flash operation, for example, a high-pressure flash tank, an atmospheric flash tank, a vacuum flash tank, etc.

[0021] In the present embodiment, the demister assembly 30 is a horizontal installation type demister installed in the flash tank or a vertical installation type demister installed on the flash steam outlet pipe, and is not limited to the horizontal installation type demister or the vertical installation type demister, and the demister assembly 30 can also be other devices with demisting function.

[0022] Please refer to Figures 2 to 3Further, the demister comprises flat baffle plates 31 and a plurality of cleaning nozzles 32 for cleaning the baffle plates, each flat baffle plate 31 is arranged along the vertical direction of the flash steam flow, and the spray ends of the cleaning nozzles 32 for cleaning the baffle plates are all directed towards each flat baffle plate 31 to flush each flat baffle plate 31, so as to prevent the flow rate of the demister from being reduced and ensure that the demister can effectively intercept black water and solid particles and other dissolved substances contained in the flash steam.

[0023] Further, according to the size of the flash tank, the cleaning area is divided into a plurality of cleaning areas, and the cleaning and flushing are regularly and quantitatively performed by using the flushing water. The flushing water pipeline is provided with corresponding electromagnetic valves on the branch pipelines before the cleaning nozzles 32 for cleaning the baffle plates, and the electromagnetic valves are opened or closed according to the set flushing program to regularly flush and clean according to the set flushing program. The flushing water can be gasification ash water or other process water, so as to prevent the flat baffle plates 31 from being bonded with solid substances and affect the demisting effect, and ensure that the flash steam flow rate is above 2.5-3.5 m / s.

[0024] In the embodiment, the regular flushing of each flat baffle plate 31 can not only remove the bonded solid substances on each flat baffle plate 31, but also ensure that each flat baffle plate 31 is flushed when the bonded solid substances on each flat baffle plate 31 reach a certain amount, so as to maximize the flushing effect of the gasification ash water or other water sprayed from each cleaning nozzle 32 for cleaning the baffle plates on each flat baffle plate 31, thereby saving the amount of gasification ash water or other water and reducing the waste of water resources.

[0025] Please refer to Figure 4 In a second aspect, the utility model provides a black water flash system 40 preventing entrainment of mist, comprising a high pressure flash tank 41, an atmospheric pressure flash tank 42 and a vacuum flash tank 43, the liquid inlet end of the high pressure flash tank 41 is used for receiving gasification black water from a carbon washing tower or generated by a gasification furnace, the bottom liquid outlet end of the high pressure flash tank 41 is connected with the liquid inlet end of the atmospheric pressure flash tank 42, and the bottom of the atmospheric pressure flash tank 42 is connected with the liquid inlet end of the vacuum flash tank 43; the bottom of the high pressure flash tank 41 is connected with a medium pressure flash tank, and among the flash tanks involved in the above flash system, at least one flash tank is the black water flash tank 10 preventing entrainment of mist as in the first aspect.

[0026] In an embodiment, the black water flash system 40 preventing entrainment of mist further comprises at least one fourth flash tank, which is arranged on any pipeline before or after the high pressure flash tank 41, the atmospheric pressure flash tank 42 and the vacuum flash tank 43, and is used for utilizing the heat of the black water flash system; the fourth flash tank is an ordinary flash tank or the black water flash tank 10 preventing entrainment of mist as in the first aspect.

[0027] In one embodiment, the fourth flash tank is a medium-pressure flash tank, the bottom of the high-pressure flash tank 41 is connected to the medium-pressure flash tank, and the liquid outlet at the bottom of the medium-pressure flash tank is connected to the liquid inlet of the atmospheric-pressure flash tank 42.

[0028] In one embodiment, the fourth flash tank is not necessarily provided.

[0029] Example 1, treatment process of gasification black water

[0030] 1. The gasification black water from the carbon washing tower or the gasification furnace is flashed in the high-pressure flash tank 41 to preliminarily separate the dissolved gas in the gasification black water;

[0031] 2. The gasification black water treated by the high-pressure flash tank 41 is flashed in the atmospheric-pressure flash tank 42 to further separate the remaining volatile components in the gasification black water;

[0032] 3. The gasification black water treated by the medium-pressure flash tank 41 is flashed in the vacuum flash tank 43 to maximize the extraction of the residual gas and part of the water vapor in the gasification black water;

[0033] 4. At the same time, the flash steam discharged from the high-pressure flash tank 41, the atmospheric-pressure flash tank 42, or the vacuum flash tank 43 is subjected to demisting by the demisting assembly 30 and then enters the subsequent system

[0034] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A black water flash tank to prevent entrainment of mist, characterized in that, The black water flash tank comprises a flash tank body and a demisting assembly; the demisting assembly is installed inside the flash tank body and used for intercepting black water and solid particles and other dissolved substances contained in the flash steam.

2. The mist-entrained black water flash tank of claim 1, wherein, The demisting assembly is a horizontal demisting device installed in the flash tank or a vertical demisting device installed on the flash steam outlet pipe.

3. The mist-entrained black water flash tank to prevent entrainment of mist according to claim 2, wherein, The demisting device comprises flat baffle plates and cleaning nozzles for cleaning the baffle plates; the flat baffle plates are uniformly arranged along the vertical direction of the flash steam flow; the spray ends of the cleaning nozzles for cleaning the baffle plates are all directed to the flat baffle plates for flushing the flat baffle plates.

4. The mist-entrained black water flash tank of claim 3, wherein, According to the size of the flash tank, the cleaning area is divided into several cleaning areas, and the flushing water is regularly and quantitatively cleaned; the flushing water pipeline is provided with corresponding electromagnetic valves on the branch pipelines before the cleaning nozzles for cleaning the baffle plates; the electromagnetic valves are opened or closed according to the set flushing program for regular cleaning according to the set flushing program; the flushing water can be gasification ash water or other process water to prevent the flat baffle plates from being bonded with solid substances and affecting the demisting effect.

5. A mist-entrained black water flash system, characterized by, The black water flash tank comprises a high-pressure flash tank, an atmospheric pressure flash tank and a vacuum flash tank; the liquid inlet end of the high-pressure flash tank is used for receiving black water generated from a carbon washing tower or a gasification furnace; the liquid outlet end at the bottom of the high-pressure flash tank is connected with the liquid inlet end of the atmospheric pressure flash tank; the bottom of the atmospheric pressure flash tank is connected with the liquid inlet end of the vacuum flash tank; in the flash tanks involved in the flash system, at least one flash tank is the black water flash tank for preventing entrainment of mist as claimed in any one of claims 1 to 4.

6. The mist-entrained black water flash system of claim 5, wherein, The black water flash system for preventing entrainment of mist further comprises at least one fourth flash tank; the fourth flash tank is arranged on any pipeline before or after the high-pressure flash tank, the atmospheric pressure flash tank and the vacuum flash tank and used for utilizing the heat of the black water flash system; the fourth flash tank is a common flash tank or the black water flash tank for preventing entrainment of mist as claimed in any one of claims 1 to 4.

7. The mist-entrained black water flash system of claim 6, wherein, The fourth flash tank is a medium-pressure flash tank; the bottom of the medium-pressure flash tank is connected with the liquid inlet end of the atmospheric pressure flash tank.

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