CN219449632U

CN219449632U - Raw gas dust removing system

Info

Publication number: CN219449632U
Application number: CN202320874995.9U
Authority: CN
Inventors: 刘海建; 郭志辉; 段少栋; 赵龙伟; 张星宇; 付贤飞
Original assignee: Xinneng Energy Co Ltd
Current assignee: Xinneng Energy Co Ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-08-01
Anticipated expiration: 2033-04-18

Abstract

The utility model discloses a raw gas dust removal system which comprises a waste heat boiler, a venturi scrubber, a first-stage washing tower and a second-stage washing tower, wherein a raw gas main pipe is communicated with an inlet pipeline of the waste heat boiler, an outlet of the waste heat boiler is communicated with an inlet pipeline of the venturi scrubber, an outlet of the venturi scrubber is communicated with a bottom inlet pipeline of the first-stage washing tower, a heat exchanger is arranged in the middle of the first-stage washing tower, a top outlet of the first-stage washing tower is communicated with a bottom inlet pipeline of the second-stage washing tower, and a top outlet of the second-stage washing tower is communicated with a clean gas outlet. The advantages are that: by adding a Venturi scrubber behind the waste heat boiler, the temperature of the coal gas is reduced, and meanwhile, tar in the coal gas can be captured by utilizing water mist to form large particles, so that the immersed absorption effect of the cleaning solution at the bottom of the primary scrubber is enhanced; and the heat exchanger is arranged at the upper part of the primary washing tower, so that the secondary absorption and utilization of the heat of the coal gas are realized, the heat utilization rate is improved, and the cooling effect of the coal gas is enhanced.

Description

Raw gas dust removing system

Technical field:

the utility model relates to the technical field of gas dust removal, in particular to a crude gas dust removal system.

The background technology is as follows:

the raw gas gasified by the fluidized bed has the characteristics of high temperature and high dust content, and can meet the requirements of users after cooling and purifying treatment. The traditional cooling and purifying device mainly adopts the structural form of a waste heat boiler, a high-efficiency cyclone separator, a filter and a washing tower, wherein raw gas is cooled by the waste heat boiler, then enters the high-efficiency cyclone separator to separate dust in the raw gas, and then enters the washing tower to further remove dust and cool to obtain purified gas. However, because the furnace temperature is low in the initial stage of the fluidized bed start-up, a large amount of tar is contained in the raw gas, the raw gas directly enters the cyclone separator and the filter after being cooled, so that the cyclone separator is easy to block and fail, the dust content of the raw gas entering the washing tower is high, the washing cooling effect of the washing tower is poor, and the temperature and the dust content of the finally discharged clean gas are not up to the standard; and the heat of the raw gas discharged by the waste heat boiler is still higher, and finally the raw gas is absorbed by circulating water of the washing tower, so that heat waste is caused. The existing metal filter system is complex in operation process and high in engineering cost, a series of equipment problems such as filter element breakage, tube plate powder leakage and the like often occur in the using process, the system is difficult to stably operate for a long period, and economic instant which is difficult to compensate is caused for enterprises.

The utility model comprises the following steps:

the utility model aims to provide a raw gas dust removal system with good cooling and purifying effects.

The utility model is implemented by the following technical scheme: the raw gas dedusting system comprises a waste heat boiler, a venturi scrubber, a first-stage scrubbing tower and a second-stage scrubbing tower, wherein a raw gas main pipe is communicated with an inlet pipeline of the waste heat boiler, an outlet of the waste heat boiler is communicated with an inlet pipeline of the venturi scrubber, an outlet of the venturi scrubber is communicated with a bottom inlet pipeline of the first-stage scrubbing tower, a heat exchanger is arranged in the middle of the first-stage scrubbing tower, a top outlet of the first-stage scrubbing tower is communicated with a bottom inlet pipeline of the second-stage scrubbing tower, and a top outlet of the second-stage scrubbing tower is communicated with a clean gas outlet.

Further, the bottom outlet of the primary washing tower and the bottom outlet of the secondary washing tower are respectively communicated with an inlet pipeline of an atmospheric flash tower through pipelines, and the bottom outlet of the atmospheric flash tower is communicated with an inlet pipeline of a sedimentation tank.

Further, a clear liquid outlet of the sedimentation tank is communicated with an inlet pipeline of a circulating pump, an outlet of the circulating pump is communicated with an inlet pipeline of a cooler, the outlet of the cooler is divided into three paths, the first path is communicated with a water inlet of the Venturi scrubber through a first branch pipe, the second path is communicated with a water inlet of the primary scrubber through a second branch pipe, and the third path is communicated with a water inlet of the secondary scrubber through a third branch pipe; and the first branch pipe, the second branch pipe and the third branch pipe are respectively provided with a first control valve, a second control valve and a third control valve.

Further, a first temperature sensor is installed on the side wall of the primary washing tower below the heat exchanger, and the first temperature sensor is connected with a controller of the first control valve.

Further, a second temperature sensor is installed on the side wall of the primary washing tower above the heat exchanger, and the second temperature sensor is connected with a controller of the second control valve.

Further, a third temperature sensor is installed at the top of the secondary washing tower, and the third temperature sensor is connected with a controller of the third control valve.

The utility model has the advantages that: by adding a Venturi scrubber behind the waste heat boiler, the temperature of the coal gas is reduced, and meanwhile, tar in the coal gas can be captured by utilizing water mist to form large particles, so that the immersed absorption effect of the cleaning solution at the bottom of the primary scrubber is enhanced; and the heat exchanger is arranged at the upper part of the primary washing tower, so that the secondary absorption and utilization of the heat of the coal gas are realized, the heat utilization rate is improved, and the cooling effect of the coal gas is enhanced.

Description of the drawings:

fig. 1 is a schematic diagram of the overall structure of the present utility model.

Tag name

The system comprises a 1-waste heat boiler, a 2-venturi scrubber, a 3-primary scrubbing tower, a 4-secondary scrubbing tower, a 5-raw gas main pipe, a 6-heat exchanger, a 7-clean gas outlet, an 8-normal pressure flash tower, a 9-sedimentation tank, a 10-circulating pump, an 11-cooler, a 12-first branch pipe, a 13-second branch pipe, a 14-third branch pipe, a 15-first control valve, a 16-second control valve, a 17-third control valve, a 18-first temperature sensor, a 19-second temperature sensor and a 20-third temperature sensor.

The specific embodiment is as follows:

in the description of the present utility model, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated azimuth or positional relationship is based on the azimuth or positional relationship shown in the drawings, only for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

As shown in fig. 1, the raw gas dust removal system comprises a waste heat boiler 1, a venturi scrubber 2, a primary scrubbing tower 3 and a secondary scrubbing tower 4, wherein a raw gas main pipe 5 is communicated with an inlet pipeline of the waste heat boiler 1, an outlet of the waste heat boiler 1 is communicated with an inlet pipeline of the venturi scrubber 2, an outlet of the venturi scrubber 2 is communicated with a bottom inlet pipeline of the primary scrubbing tower 3, a heat exchanger 6 is arranged in the middle of the primary scrubbing tower 3, a top outlet of the primary scrubbing tower 3 is communicated with a bottom inlet pipeline of the secondary scrubbing tower 4, and a top outlet of the secondary scrubbing tower 4 is communicated with a clean gas outlet 7.

The bottom outlet of the primary washing tower 3 and the bottom outlet of the secondary washing tower 4 are respectively communicated with an inlet pipeline of the normal pressure flash tower 8 through pipelines, and the bottom outlet of the normal pressure flash tower 8 is communicated with an inlet pipeline of the sedimentation tank 9.

The outlet of the settling pond 9 is communicated with an inlet pipeline of the circulating pump 10, the outlet of the circulating pump 10 is communicated with an inlet pipeline of the cooler 11, the outlet of the cooler 11 is divided into three paths, the first path is communicated with the water inlet of the Venturi scrubber 2 through a first branch pipe 12, the second path is communicated with the water inlet of the primary scrubber 3 through a second branch pipe 13, and the third path is communicated with the water inlet of the secondary scrubber 4 through a third branch pipe 14; a first control valve 15, a second control valve 16 and a third control valve 17 are respectively installed on the first branch pipe 12, the second branch pipe 13 and the third branch pipe 14; the first control valve 15, the second control valve 16 and the third control valve 17 are all temperature control valves. A first temperature sensor 18 is installed on the side wall of the primary scrubber 3 below the heat exchanger 6, and the first temperature sensor 18 is connected with the controller of the first control valve 15. The first temperature sensor 18 is used for detecting the temperature of the lower part of the primary washing tower 3, and when the detected temperature is higher than the set temperature, the opening of the first control valve 15 is increased, so that the purpose of increasing the water spraying amount of the venturi scrubber 2 is achieved. A second temperature sensor 19 is mounted on the side wall of the primary scrubber 3 above the heat exchanger 6, the second temperature sensor 19 being connected to the controller of the second control valve 16. The second temperature sensor 19 is used for detecting the temperature of the upper part of the first-stage washing tower 3, and when the detected temperature is higher than the set temperature, the opening of the second control valve 16 is increased, so that the purpose of increasing the water spraying amount of the first-stage washing tower 3 is achieved. A third temperature sensor 20 is arranged at the top of the secondary washing tower 4, and the third temperature sensor 20 is connected with a controller of a third control valve 17. The third temperature sensor 20 is used for detecting the temperature of the upper part of the secondary washing tower 4, and when the detected temperature is higher than the set temperature, the opening of the third control valve 17 is increased, so that the purpose of increasing the water spraying amount of the secondary washing tower 4 is achieved.

Cooling and dedusting:

the raw gas sent by the raw gas main pipe 5 is subjected to heat exchange and temperature reduction through the waste heat boiler 1, and meanwhile, a cooling medium (saturated steam) is heated, high-temperature heat energy in the raw gas is recovered, and then the raw gas is sent to a venturi scrubber;

after the process gas enters a venturi scrubber 2, particles and tar in the gas are trapped by utilizing water mist to form large particles, and then the large particles enter a primary scrubber 3;

after entering the primary washing tower 3, the gas is firstly immersed in the washing liquid at the bottom of the primary washing tower for dedusting and cooling, and then upwards passes through a heat exchanger at the upper part of the primary washing tower 3, so that the temperature of the gas is further reduced, and meanwhile, the gas is continuously sprayed and dedusted through top spray water; the heat exchanger 6 recovers the part of heat by using circulating water, so that the heat utilization rate is improved;

the gas discharged from the first-stage washing tower 3 enters a second-stage washing tower 4, and the second-stage washing tower 4 sprays and washes the gas, removes dust and reduces the temperature.

The water at the bottoms of the first-stage washing tower 3 and the second-stage washing tower 4 is discharged to an atmospheric flash tower, flash gas is discharged (or recycled) at a high point, and the water is discharged to a sedimentation tank 9; the clarified liquid overflowed from the sedimentation tank 9 is pressurized by a circulating pump 10, exchanges heat with cooling water in a cooler 11 and is cooled, and then is sent to a Venturi scrubber 2, a primary scrubber 3 and a secondary scrubber 4 to be used as spray water so as to realize recycling.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. The raw gas dust removal system is characterized by comprising a waste heat boiler, a venturi scrubber, a first-stage scrubber and a second-stage scrubber, wherein a raw gas main pipe is communicated with an inlet pipeline of the waste heat boiler, an outlet of the waste heat boiler is communicated with an inlet pipeline of the venturi scrubber, an outlet of the venturi scrubber is communicated with a bottom inlet pipeline of the first-stage scrubber, a heat exchanger is arranged in the middle of the first-stage scrubber, a top outlet of the first-stage scrubber is communicated with a bottom inlet pipeline of the second-stage scrubber, and a top outlet of the second-stage scrubber is communicated with a clean gas outlet.

2. The raw gas dust removal system of claim 1, wherein the bottom outlet of the primary scrubber and the bottom outlet of the secondary scrubber are respectively communicated with an inlet pipeline of an atmospheric flash tower through pipelines, and the bottom outlet of the atmospheric flash tower is communicated with an inlet pipeline of a sedimentation tank.

3. The raw gas dust removal system according to claim 2, wherein a clear liquid outlet of the sedimentation tank is communicated with an inlet pipeline of a circulating pump, an outlet of the circulating pump is communicated with an inlet pipeline of a cooler, the outlet of the cooler is divided into three paths, a first path is communicated with a water inlet of the venturi scrubber through a first branch pipe, a second path is communicated with a water inlet of the primary scrubber through a second branch pipe, and a third path is communicated with a water inlet of the secondary scrubber through a third branch pipe; and the first branch pipe, the second branch pipe and the third branch pipe are respectively provided with a first control valve, a second control valve and a third control valve.

4. A raw gas dust removal system as claimed in claim 3, wherein a first temperature sensor is mounted on a side wall of the primary scrubber below the heat exchanger, the first temperature sensor being connected to a controller of the first control valve.

5. A raw gas dust removal system as claimed in claim 3, wherein a second temperature sensor is mounted on a side wall of the primary scrubber above the heat exchanger, the second temperature sensor being connected to a controller of the second control valve.

6. A raw gas dust removal system as claimed in claim 3, wherein a third temperature sensor is installed at the top of the secondary scrubber, the third temperature sensor being connected to a controller of the third control valve.