CN213902074U

CN213902074U - Solve online automatic washing unit of denitration GGH heat exchanger jam

Info

Publication number: CN213902074U
Application number: CN202022264128.2U
Authority: CN
Inventors: 甄众; 董云江; 董志刚; 安文山; 刘佳; 张军; 赵辉
Original assignee: Tianjin New Tiangang United Special Steel Co Ltd
Current assignee: Tianjin New Tiangang United Special Steel Co Ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-08-06
Anticipated expiration: 2030-10-12

Abstract

The utility model belongs to the technical field of the denitration device, especially, relate to an online automatic washing unit who solves denitration GGH heat exchanger jam. Comprises a high-pressure washing water pump arranged outside a GGH heat exchanger; the outlet end of the high-pressure washing water pump is connected with a washing water main pipeline, and the tail end of the washing water main pipeline is over against a manhole door of the GGH heat exchanger; the tail end of the main flushing water pipeline is connected with a plurality of flushing water branches; a washing water branch extends into a purified gas end of the GGH through the manhole door; and a plurality of duckbilled flushing water nozzles are arranged on the outer side of each flushing water branch. After the startup is finished after flushing, the differential pressure value of the GGH heat exchanger reaches about 500pa, the GGH operates stably, the differential pressure is not increased all the time, the stability of a denitration system is greatly improved, the shutdown times of denitration due to the high differential pressure of the GGH are reduced, and the stable operation of denitration ultralow emission is ensured.

Description

Solve online automatic washing unit of denitration GGH heat exchanger jam

Technical Field

The utility model belongs to the technical field of the denitration device, especially, relate to an online automatic washing unit who solves denitration GGH heat exchanger jam.

Background

The GGH heat exchanger is one of main devices in a denitration system of our factory, and has the functions of preheating inlet raw flue gas with the temperature of about 130 ℃ in a sintering large flue to 280 ℃ by utilizing high-temperature outlet flue gas with the temperature of about 320 ℃ of a denitration catalyst outlet, so that the SCR reaction requirement of a hot blast stove on the heating of the flue gas to 320 ℃ is facilitated, and simultaneously, the outlet temperature of the catalyst is cooled to about 150 ℃ so as to reduce the temperature of the flue gas entering a primary cooler and a booster fan.

The GGH heat exchanger is built synchronously with host equipment in the earlier stage, continuously operates for 168 hours in the same period, and then operates synchronously with the host, but the differential pressure of the GGH heat exchanger gradually rises to 1800pa finally in the later stage, so that denitration cannot normally operate. During the period, the treatment for many times has no obvious effect, and the washing is carried out by using a large water quantity mode after analysis and research.

The defects before improvement are as follows: in operation, if the GGH heat exchanger is subjected to internal scaling and blocking, the outlet pressure of the main exhaust fan can reach 1500pa or even higher, so that the denitration device and sintering cannot normally operate. On one hand, the scaling has great harm, so that the metal surface of the GGH heat exchanger equipment is corroded in a large area in a short time; on the other hand, because the corrosion causes the metal surface to generate sediments and causes the metal surface to be in a rough state, when a unit is started and operated, the formation of iron scale in a system and a flue is aggravated, and the corrosion of equipment in operation is also aggravated, so that the on-line automatic flushing device for solving the blockage problem of the denitration GGH heat exchanger is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the technical problem that exists among the well-known technology and provide an online automatic washing unit who solves denitration GGH heat exchanger and block up, wash the start back that finishes, GGH heat exchanger differential pressure value reaches about normal 500pa, GGH operates steadily afterwards, and pressure differential does not rise always, has promoted deNOx systems's stability greatly, has reduced the denitration because of the high shut-down number of times of GGH differential pressure, has guaranteed the steady operation of the ultralow emission of denitration.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an online automatic flushing device for solving the blockage problem of a denitration GGH heat exchanger comprises a high-pressure flushing water pump arranged on the outer side of the GGH heat exchanger; the outlet end of the high-pressure washing water pump is connected with a washing water main pipeline, and the tail end of the washing water main pipeline is over against a manhole door of the GGH heat exchanger; the tail end of the main flushing water pipeline is connected with a plurality of flushing water branches; a washing water branch extends into a purified gas end of the GGH through the manhole door; and a plurality of duckbilled flushing water nozzles are arranged on the outer side of each flushing water branch.

Furthermore, the distance between every two adjacent flushing water nozzles on each flushing water branch is 200 mm.

Furthermore, all the flushing water nozzles are positioned at the same horizontal height and 200mm away from the upper surface of the GGH heat exchanger.

Further, the washing water main pipeline comprises 3 washing water branches, and/or each washing water branch comprises 10 washing water nozzles.

Furthermore, the distance between the flushing water nozzles on the adjacent flushing water branches is L, and the distance between the flushing water nozzles close to the GGH heat exchanger and the inner wall of the heat exchanger is also L.

The utility model has the advantages and positive effects that:

the utility model has the advantages of simple and reasonable structure, through set up high pressure water pump in the GGH heat exchanger outside, connect the sparge water trunk line on the high pressure water pump, a plurality of sparge water branch roads are connected to the sparge water trunk line, and a plurality of duckbilled formula wash water injection well choke on the sparge water branch road thoroughly washes the GGH heat exchanger. After the startup is finished after flushing, the differential pressure value of the GGH heat exchanger reaches about 500pa, the GGH operates stably, the differential pressure is not increased all the time, the stability of a denitration system is greatly improved, the shutdown times of denitration due to the high differential pressure of the GGH are reduced, and the stable operation of denitration ultralow emission is ensured.

Description of the drawings:

FIG. 1 is a schematic view of an on-line automatic flushing device according to the present invention;

wherein: 1. a GGH heat exchanger; 11. a manhole door; 2. a water pump; 3. a main wash water conduit; 4. a rinsing water branch; 41. a manual valve; 42. and (5) flushing the water nozzle.

Detailed Description

The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present invention; rather than all embodiments. Based on the embodiment of the utility model; all other embodiments obtained by a person skilled in the art without making any inventive step; all belong to the protection scope of the utility model.

As shown in fig. 1, the utility model provides an online automatic flushing device for solving the blockage of a denitration GGH heat exchanger 1, which comprises a high-pressure flushing water pump 2 arranged outside the GGH heat exchanger 1, wherein the water supply pressure at the outlet of the water pump 2 is not lower than 5 MPa; the outlet end of the high-pressure washing water pump 2 is connected with a washing water main pipeline 3 with the pipe diameter of DN108, and the tail end of the washing water main pipeline 3 is over against a manhole door 11 of the GGH heat exchanger 1; the tail end of the main washing water pipeline 3 is connected with a plurality of washing water branches 4 with the pipe diameter of DN50, and each washing water branch 4 is provided with a manual valve 41; a through hole matched with the flushing water branch 4 is formed in the manhole door 11, and the flushing water branch 4 extends into a GGH clean smoke end through the through hole; a plurality of duckbilled flushing water nozzles 42 are arranged on the outer side of each flushing water branch 4, and the distance between every two adjacent flushing water nozzles 42 is 200 mm; all the flushing water nozzles 42 are positioned at the same horizontal height and are 200mm away from the upper surface of the GGH heat exchanger 1;

preferably, the main flushing water pipeline 3 comprises 3 flushing water branches 4, each flushing water branch 4 comprises 10 flushing water nozzles 42, the distance between the closest flushing water nozzle 42 on the adjacent flushing water branch 4 is L, and the distance between the closest flushing water nozzle 42 and the inner wall of the heat exchanger is also L, so that the 3-way flushing water pipeline can carry out full-coverage flushing on the GGH heat exchanger 1 rotating along the axis.

The working principle is as follows:

during on-line washing, firstly, the GGH heat exchanger 1 is operated at a low speed, the high-pressure washing water pump 2 is started, the manual valve 41 of one washing water branch 4 is opened, the washing water is continuously washed for 30 minutes and then switched to the second washing water branch 4, and the rest is done, and the high-pressure washing water pump 2 is stopped after all the 3 branches are washed.

And after the flushing is finished, the heat exchanger is dried by adopting compressed air by a GGH soot blower in time.

The embodiments of the present invention have been described in detail, but the above description is only for the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The utility model provides a solve online automatic washing unit that denitration GGH heat exchanger blockked up which characterized in that: comprises a high-pressure washing water pump arranged outside a GGH heat exchanger; the outlet end of the high-pressure washing water pump is connected with a washing water main pipeline, and the tail end of the washing water main pipeline is over against a manhole door of the GGH heat exchanger; the tail end of the main flushing water pipeline is connected with a plurality of flushing water branches; a washing water branch extends into a purified gas end of the GGH through the manhole door; and a plurality of duckbilled flushing water nozzles are arranged on the outer side of each flushing water branch.

2. The on-line automatic flushing device for solving the blockage problem of the denitration GGH heat exchanger as set forth in claim 1, wherein: the distance between every two adjacent flushing water nozzles on each flushing water branch is 200 mm.

3. The on-line automatic flushing device for solving the blockage problem of the denitration GGH heat exchanger as set forth in claim 1, wherein: all the flushing water nozzles are positioned at the same horizontal height and 200mm away from the upper surface of the GGH heat exchanger.

4. The on-line automatic flushing device for solving the blockage problem of the denitration GGH heat exchanger as set forth in claim 1, wherein: the washing water main pipeline comprises 3 washing water branches and/or each washing water branch comprises 10 washing water nozzles.

5. The on-line automatic flushing device for solving the blockage problem of the denitration GGH heat exchanger as set forth in claim 1, wherein: the distance between the flushing water nozzles on adjacent flushing water branches is L, and the distance between the flushing water nozzles close to the GGH heat exchanger and the inner wall of the heat exchanger is also L.