CN212843002U

CN212843002U - Waste heat recovery boiler is used in sodium sulfide production

Info

Publication number: CN212843002U
Application number: CN202021933464.5U
Authority: CN
Inventors: 彭树先; 唐朝清
Original assignee: Sichuan Liyuan Chemical Co ltd
Current assignee: Sichuan Liyuan Chemical Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-03-30
Anticipated expiration: 2030-09-07

Abstract

The utility model discloses a waste heat recovery boiler is used in sodium sulfide production, include: a plurality of rotary kilns are arranged; a plurality of water-cooled wall settling chambers are arranged; a membrane wall flue; a convection tube; a coal economizer; wherein, the smoke outlet of the rotary kiln is communicated with the smoke inlet of the water-cooled wall settling chamber; the utility model discloses a production line no matter there are several rotary kilns all share 1 exhaust-heat boiler, arrange a large amount of heated surfaces, improved high temperature flue gas recycle rate, efficiency promotes, has reduced the energy consumption in the production process, the fortune dimension cost reduces, does not need blowing out the deashing, the bottom adopts scraper conveyor deashing, does not need artifical deashing, airtight tight air leakage is few, production cycle is longer, the steam production capacity is many, can almost satisfy the production demand, only need additionally supply steam when having rotary kilns to shut out the stove and trade the brick or stopping production and overhaul; the construction investment cost is general, and the operation and maintenance cost is lower.

Description

Waste heat recovery boiler is used in sodium sulfide production

Technical Field

The utility model relates to a sodium sulfide production technical field specifically is a waste heat recovery boiler is used in sodium sulfide production.

Background

Sodium sulfide generally needs to use the waste heat recovery boiler while producing, 1 rotary kiln is matched with 1 waste heat boiler, the waste heat boiler adopts 2 drums to arrange from top to bottom, the middle adopts phi 51 x 3.5mm boiler tube to connect, as absorbing the heated surface of the high-temperature flue gas and rising channel of the heating furnace water in the tube, there are phi 159 x 8mm boiler tube 4 between front and back both ends of the upper and lower drums in addition, as the downcomer of the furnace water, the riser, downcomer, upper drum, lower drum form a closed cycle; the lower drum is provided with a water inlet and a sewage outlet, a steam-water separator is arranged in the upper drum, steam and water separation is carried out on saturated furnace water rising from the ascending pipe, the separated furnace water is conveyed to the lower drum through the descending pipe, the 2 nd circulation is continued, and the separated steam enters the branch cylinder from the outlet pipeline for the working procedure of needing steam.

However, the traditional waste heat recovery boiler is inconvenient to use at present, a plurality of waste heat boilers are required to be built for 1 production line with a plurality of rotary kilns, the heat exchange area of a single boiler is small, the utilization rate of high-temperature flue gas heat efficiency is low, dust is easy to accumulate among heat exchange tubes, the cleaning is not thorough during production, the boiler is stopped for cleaning about 20 days of production, the production capacity is influenced, manual dust cleaning is required at the bottom, the workload is large, a plurality of manholes are formed, and the leakage air is not tight; the amount of generated steam is small, the production needs can be met only by additionally supplementing steam, and the construction investment and the maintenance cost are high, so that the production cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a waste heat recovery boiler is used in sodium sulfide production to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a waste heat recovery boiler for sodium sulfide production, comprising:

a plurality of rotary kilns are arranged;

a plurality of water-cooled wall settling chambers are arranged;

a membrane wall flue;

a convection tube;

a coal economizer;

the smoke outlet of the rotary kiln is communicated with the smoke inlet of the water wall settling chamber, the smoke outlet of the water wall settling chamber is communicated with the smoke inlet of the membrane wall flue, the smoke outlet of the membrane wall flue is communicated with the smoke inlet of the convection pipe, and the smoke outlet of the convection pipe is communicated with the smoke inlet of the economizer.

Preferably, the method further comprises the following steps:

a smoke tube type preheating water tank;

wherein, the smoke inlet of the smoke tube type preheating water tank is communicated with the smoke outlet of the coal economizer.

Preferably, the method further comprises the following steps:

the ash removal mechanism comprises a bucket elevator, a first scraper conveyor, a second scraper conveyor and a third scraper conveyor, wherein the input end of the bucket elevator is respectively connected with the output ends of the first scraper conveyor, the second scraper conveyor and the third scraper conveyor;

the third scraper conveyor is fixedly installed at a sewage discharge port of the water wall settling chamber, the second scraper conveyor is fixedly installed at a sewage discharge port of the membrane water wall flue, and the first scraper conveyor is respectively and fixedly installed at sewage discharge ports of the convection tube, the economizer and the smoke tube type preheating water tank.

Preferably, the membrane wall flue is formed by welding a No. 20 low-medium pressure boiler steel pipe and a delta 4 steel plate.

Preferably, the coal economizer is provided with a plurality of groups, each group is provided with an upper collecting box and a lower collecting box, and a plurality of phi 32 multiplied by 3 boiler pipes are bent into a snake shape and welded among the collecting boxes.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a production line no matter there are several rotary kilns all share 1 exhaust-heat boiler, arrange a large amount of heated surfaces, improved high temperature flue gas recycle rate, efficiency promotes, has reduced the energy consumption in the production process, the fortune dimension cost reduces, does not need blowing out the deashing, the bottom adopts scraper conveyor deashing, does not need artifical deashing, airtight tight air leakage is few, production cycle is longer, the steam production capacity is many, can almost satisfy the production demand, only need additionally supply steam when having rotary kilns to shut out the stove and trade the brick or stopping production and overhaul; the construction investment cost is general, and the operation and maintenance cost is lower.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a front view of the present invention.

In the figure: 10-rotary kiln; 20-a water-cooled wall settling chamber; 30-membrane wall flue; 40-convection tubes; 50-an economizer; 60-smoke tube type preheating water tank; 70-a dust removal mechanism; 71-bucket elevator; 72-scraper conveyor number one; 73-second scraper conveyor; 74-third flight conveyor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a waste heat recovery boiler for sodium sulfide production, comprising: kiln 10, water wall settling chamber 20, membrane wall flue 30, convection tube 40, and economizer 50.

Furthermore, the water wall settling chamber 20 adopts phi 219 x 8 boiler tubes 6 as headers, the boiler water is introduced into the lower header by 2 phi 108 x 4.5 downcomer pipes respectively, the top of the upper header is provided with 2 phi 89 x 4.5 pipes for introducing steam into the boiler barrel, the upper header, the middle header and the lower header are connected by phi 51 x 3.5mm boiler tubes, and partial fence type convection tubes are welded to form a single water circulation loop.

Furthermore, the membrane wall flue 30 uses 4 phi 219 x 8 boiler tubes as headers, 3 phi 89 x 4.5 downcomers enter the lower header from the boiler drum, 2 phi 89 x 4.5 steam eduction tubes enter the boiler drum from the top of the upper header, the upper header and the lower header are connected by phi 51 x 3.5mm boiler tubes, and partial fence type convection tubes are welded to form an independent water circulation loop.

Furthermore, 4 phi 219 × 8 boiler tubes are adopted as the convection tubes 40 as headers, 3 phi 108 × 4.5 downcomers are arranged in the lower header, and 2 phi 89 × 4.5 steam eductors are arranged on 2 upper headers respectively and enter the boiler barrel to form an independent circulation loop.

Furthermore, the inlet pipe and the outlet pipe of the coal economizer 50 are phi 57 multiplied by 3.5, and forced circulation is adopted by a feed water pump.

Wherein, a plurality of rotary kilns 10 are provided.

Wherein, the waterwall settling chamber 20 is provided in plurality.

Furthermore, each water wall settling chamber 20, each section of membrane water wall flue 30 and the lower collection box of the convection pipe 40 are provided with two sewage outlets, the lower collection box of the coal economizer 50 is provided with 1 sewage outlet which is totally provided with a DN40 sewage valve, and the boiler barrel is provided with 1 DN25 continuous sewage outlet.

The smoke outlet of the rotary kiln 10 is communicated with the smoke inlet of the water wall settling chamber 20, the smoke outlet of the water wall settling chamber 20 is communicated with the smoke inlet of the membrane wall flue 30, the smoke outlet of the membrane wall flue 30 is communicated with the smoke inlet of the convection pipe 40, and the smoke outlet of the convection pipe 40 is communicated with the smoke inlet of the economizer 50.

Wherein, still include: a flue tube preheating water tank 60.

Wherein, the smoke inlet of the smoke tube type preheating water tank 60 is communicated with the smoke outlet of the coal economizer 50.

Wherein, still include: and an ash removal mechanism 70.

The ash removal mechanism 70 comprises a bucket elevator 71, a first scraper conveyor 72, a second scraper conveyor 73 and a third scraper conveyor 74, wherein the input end of the bucket elevator 71 is connected with the output ends of the first scraper conveyor 72, the second scraper conveyor 73 and the third scraper conveyor 74 respectively.

The third scraper conveyor 74 is fixedly installed at a sewage discharge port of the water wall settling chamber 20, the second scraper conveyor 73 is fixedly installed at a sewage discharge port of the membrane water wall flue 30, and the first scraper conveyor 72 is respectively and fixedly installed at sewage discharge ports of the convection tube 40, the economizer 50 and the smoke tube type preheating water tank 60.

The membrane wall flue 30 is formed by welding a No. 20 low-medium pressure boiler steel pipe and a delta 4 steel plate.

The coal economizer 50 is provided with a plurality of groups, each group is provided with an upper collecting box and a lower collecting box, and a plurality of phi 32 multiplied by 3 boiler pipes are bent into a snake shape and welded among the collecting boxes.

The working principle is as follows: when in use, high-temperature flue gas discharged by the rotary kiln 10 respectively enters the independent water-cooled wall settling chambers 20 surrounded by membrane walls, after cooling and dust reduction, the flue gas respectively enters the membrane water-cooled wall flues 30, enters the second return stroke from the left end and the right end, enters the third section of membrane water-cooled wall flues 30, then upwardly enters the convection tube 40 area, the periphery of the convection tube 40 also consists of the membrane walls, the middle part is a staggered tube heating surface, the flue gas flushes the convection tube 40, then turns downwards to enter the economizer 50, flushes the tubes of the economizer 50, is discharged out of the boiler after the temperature is reduced to below 160 ℃, enters the smoke tube type preheating water tank 60, enters the dust removal and desulfurization system after the temperature is reduced to about 150 ℃, and finally is discharged into the atmosphere.

It is noted that, herein, relational terms such as first and second, and the like may be 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.

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.

Claims

1. The utility model provides a waste heat recovery boiler is used in sodium sulfide production which characterized in that includes:

a plurality of rotary kilns (10), wherein the rotary kilns (10) are provided;

a plurality of water-cooled wall settling chambers (20), wherein the water-cooled wall settling chambers (20) are arranged;

a membrane wall flue (30);

a convection tube (40);

an economizer (50);

the smoke outlet of the rotary kiln (10) is communicated with the smoke inlet of the water wall settling chamber (20), the smoke outlet of the water wall settling chamber (20) is communicated with the smoke inlet of the membrane wall flue (30), the smoke outlet of the membrane wall flue (30) is communicated with the smoke inlet of the convection pipe (40), and the smoke outlet of the convection pipe (40) is communicated with the smoke inlet of the economizer (50).

2. The heat recovery boiler for sodium sulfide production according to claim 1, further comprising:

a smoke tube type preheating water tank (60);

wherein, the smoke inlet of the smoke tube type preheating water tank (60) is communicated with the smoke outlet of the coal economizer (50).

3. The heat recovery boiler for sodium sulfide production according to claim 1, further comprising:

the ash removal mechanism (70) comprises a bucket elevator (71), a first scraper conveyor (72), a second scraper conveyor (73) and a third scraper conveyor (74), and the input end of the bucket elevator (71) is connected with the output ends of the first scraper conveyor (72), the second scraper conveyor (73) and the third scraper conveyor (74) respectively;

the third scraper conveyor (74) is fixedly installed at a sewage discharge port of the water wall settling chamber (20), the second scraper conveyor (73) is fixedly installed at a sewage discharge port of the membrane water wall flue (30), and the first scraper conveyor (72) is fixedly installed at sewage discharge ports of the convection pipe (40), the economizer (50) and the smoke tube type preheating water tank (60) respectively.

4. The heat recovery boiler for sodium sulfide production according to claim 1, characterized in that: the membrane wall flue (30) is formed by welding a No. 20 low-medium pressure boiler steel pipe and a delta 4 steel plate.

5. The heat recovery boiler for sodium sulfide production according to claim 1, characterized in that: the coal economizer (50) is provided with a plurality of groups, each group is provided with an upper collecting box and a lower collecting box, and a plurality of phi 32 multiplied by 3 boiler pipes are bent into a snake shape and welded among the collecting boxes.