CN211373274U

CN211373274U - Novel pyrite acid making cinder waste heat recovery device

Info

Publication number: CN211373274U
Application number: CN201922077918.7U
Authority: CN
Inventors: 李坚; 冯扣宝; 陆明宇; 孟岩峰; 纪烈勇
Original assignee: SHANGHAI TRIUMPH ENERGY CONSERVATION ENGINEERING CO LTD
Current assignee: SHANGHAI TRIUMPH ENERGY CONSERVATION ENGINEERING CO LTD
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-08-28
Anticipated expiration: 2029-11-27

Abstract

The utility model relates to a pyrite slay waste heat recovery technical field is a novel pyrite acid making cinder waste heat recovery device particularly, including the cold sediment machine of fluidized bed furnace, heat preservation storage tank, high temperature section and the cold sediment machine of low temperature section, its characterized in that: the high-temperature section slag cooler and the low-temperature section slag cooler are identical in structure and comprise a roller, a slag inlet pipe is arranged in the roller, a water pipe is arranged on the outer side of the slag inlet pipe, the cross section of the slag inlet pipe is formed by splicing a plurality of hexagonal honeycomb bodies, a speed reducer is arranged on one side of the roller, and a support is arranged at the bottom of the roller and used for adjusting the gradient of the roller, and the high-temperature section slag cooler and the: dry-method slag discharge can be realized, acid corrosion of equipment is effectively avoided, and waste of water is reduced; two-stage cooling is adopted, so that the heat exchange efficiency is high, and the equipment maintenance is simple; the device has the advantages of simple structure, convenient operation and maintenance, small occupied area and short construction period.

Description

Novel pyrite acid making cinder waste heat recovery device

Technical Field

The utility model relates to a pyrite cinder waste heat recovery technical field is a novel pyrite system acid cinder waste heat recovery device particularly.

Background

Sulfuric acid is used as an important basic chemical raw material and is widely applied to industries such as metallurgy, petrifaction and food. China has rich pyrite resources, currently, the production of acid by using pyrite is still the main method for producing sulfuric acid in domestic industry, and the sulfuric acid produced by using the method accounts for about 70% of the total production of sulfuric acid in China. The waste heat in the pyrite acid making process is recycled, so that the purposes of energy conservation and consumption reduction can be achieved, and considerable economic benefits can be generated. In the roasting process of pyrite for making acid, a method of recovering waste heat of high-temperature flue gas generated by combustion through a waste heat boiler is widely used, but the waste heat utilization of high-temperature slag discharged by a boiling furnace still has a problem. The temperature of slag discharged by the fluidized bed furnace is 800-900 ℃, the roller slag cooler adopted by most enterprises in the past is used for cooling the slag by directly contacting the slag with cooling water, the waste heat of the slag cannot be recovered by the mode, the waste of water resources is caused, and the production cost of the enterprises is increased to a certain extent by the cooled wastewater treatment. In recent years, with the continuous improvement of slag coolers, roller slag coolers adopting dividing wall type heat exchange have been widely adopted. The slag cooler adopts the design of separating the slag channel from the water channel, and hot water generated after heat exchange between cooling water and slag can be used as domestic water for factories.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects of the prior art, and provide a novel pyrite-based sulphuric acid cinder waste heat recovery device which can ensure the separation of a water channel and a slag channel and improve the economic benefit by adopting two-section cooling.

In order to realize above-mentioned purpose, design a novel pyrite system acid-making cinder waste heat recovery device, including fluidized bed furnace, heat preservation storage tank, cold sediment machine of high temperature section and the cold sediment machine of low temperature section, its characterized in that: the high-temperature section slag cooler and the low-temperature section slag cooler are identical in structure and comprise a roller, a slag inlet pipe is arranged in the roller, a water pipe is arranged on the outer side of the slag inlet pipe, the cross section of the slag inlet pipe is formed by splicing a plurality of hexagonal honeycomb bodies, a speed reducer is arranged on one side of the roller, and a support is arranged at the bottom of the roller and used for adjusting the inclination of the roller.

The device still includes chemical water treatment facilities, chemical water treatment facilities passes through the water pipe of the cold sediment machine of pipe connection low temperature section, the cold sediment machine water pipe of high temperature section is connected through the heating power oxygen-eliminating device to the water pipe of the cold sediment machine of low temperature section, the cold sediment machine water piping connection steam pocket of high temperature section, the steam pipe export of steam pocket is connected hot user and heating power oxygen-eliminating device respectively, the water piping connection of steam pocket to the water pipe of the cold sediment machine of high temperature section, constitute the return circuit, the water pipe of the cold sediment machine of high temperature section and the water piping connection of the cold sediment machine of low temperature section, constitute another return circuit with.

The slag inlet of the slag inlet pipe of the high-temperature-section slag cooler is communicated with the heat preservation storage tank, the slag outlet of the slag inlet pipe of the high-temperature-section slag cooler is communicated with the slag inlet of the low-temperature-section slag cooler, and the slag outlet of the low-temperature-section slag cooler is provided with a belt conveyor.

Compared with the prior art, the utility model, its advantage lies in:

1. dry-method slag discharge can be realized, acid corrosion of equipment is effectively avoided, and waste of water is reduced;

2. two-stage cooling is adopted, so that the heat exchange efficiency is high, and the equipment maintenance is simple;

3. the device has simple structure, convenient operation and maintenance, small occupied area and short construction period;

4. the method has the advantages that 320t of slag is discharged daily, 24 hours of operation are carried out, the annual operation time is 330 days of operation, the annual steam production amount reaches 19958.4t, and the cost recovery period can be effectively shortened.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic end view of the slag cooler of the present invention;

FIG. 3 is a schematic view of the slag cooler of the present invention;

in the figure: 1. the system comprises a fluidized bed furnace 2, a heat preservation storage tank 3, a high-temperature section slag cooler 4, a low-temperature section slag cooler 5, a roller 6, a slag inlet pipe 7, a speed reducer 8, a support 9, a thermal deaerator 10, a steam drum 11, a belt conveyor 12, a slag inlet 13, a water outlet 14, a water inlet 15 and a water outlet.

Detailed Description

The structure and principle of such a device will be apparent to those skilled in the art from the following further description of the invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The pyrite acid making adopts the fluidized bed furnace roasting, the slag temperature discharged by the fluidized bed furnace is 800-900 ℃, the discontinuity of slag discharge of the fluidized bed furnace is considered, a heat preservation storage tank is arranged in front of a cooler, the patent proposes that two-stage cooling (high-temperature section and low-temperature section) is adopted, a roller slag cooler adopts the dividing wall type heat exchange, the slag inlet end face of the slag cooler is shown in figure 2, the slag is not directly contacted with water, the waste of water is avoided, and the possibility of slag recycling is also ensured, the two coolers adopt the horizontal high-low position arrangement, the height difference of the centers of the two coolers is more than or equal to 1.1 meter, so that the slag is ensured to pass in and out, and the structure of the slag cooler is shown in figure.

Referring to fig. 1: the utility model provides a configuration steam pocket, heating power oxygen-eliminating device and chemical water treatment facilities, the raw water gets into the low temperature section cooler at first after chemical water treatment facilities handles, the hot water that the low temperature section cooler produced is sent into the high temperature section through the water pump pressurization after heating power deoxidization, high temperature water (steam-water mixture) through high temperature section heating production directly sends into the steam pocket, realize steam-water separation in the steam pocket, a part of steam that produces is directly carried to the low reaches user, a part is used for the heating power oxygen-eliminating device, the saturated water of separating is forced to circulate through the water pump and is sent back the high temperature section heat exchanger and form the circulation, chemical water treatment facilities is confirmed according to the local water source condition, it can to satisfy steam pocket stove water quality control standard (GB 1576-2001).

By taking a certain sulfuric acid production line in China as reference, the slag yield of the production line is 320t/d, the slag temperature is 860 ℃, the slag is cooled by adopting the method, the slag discharging temperature after cooling is less than or equal to 200 ℃, and the thermal parameters are summarized as follows:

summary of thermodynamic parameters

The heat efficiency of the cooling device in this section (860-200 ℃) is 92% and the heat efficiency of the whole device reaches 70% by calculation. According to the daily slag discharge amount of 320t, 24-hour operation, 330-day annual operation time, and the annual steam production amount of 19958.4 t.

Claims

1. The utility model provides a novel pyrite system acid making cinder waste heat recovery device, includes fluidized bed furnace (1), heat preservation storage tank (2), cold sediment machine of high temperature section (3) and cold sediment machine of low temperature section (4), its characterized in that: high temperature section cold sediment machine (3) and low temperature section cold sediment machine (4) structure are the same, including a cylinder (5), are equipped with into sediment pipe (6) in cylinder (5), advance the sediment pipe (6) outside and are equipped with the water pipe, advance sediment pipe (6) cross-section and constitute by the cellular concatenation of a plurality of hexagon, cylinder (5) one side is equipped with speed reducer (7), and cylinder (5) bottom is equipped with support (8) for adjustment cylinder (5) gradient.

2. The novel device for recovering the waste heat of the pyrite-based sulphuric acid production slag according to claim 1, is characterized in that: the device still includes chemical water treatment facilities, chemical water treatment facilities passes through the water pipe of the cold sediment machine of pipe connection low temperature section, the water pipe of the cold sediment machine of low temperature section passes through heating power oxygen-eliminating device (9) and connects the cold sediment machine water pipe of high temperature section, the cold sediment machine water piping connection steam pocket (10) of high temperature section, hot user and heating power oxygen-eliminating device (9) are connected respectively in the steam pipe export of steam pocket (10), the water piping connection of steam pocket to the cold sediment machine of high temperature section, constitute the return circuit, the water pipe of the cold sediment machine of high temperature section and the water piping connection of the cold sediment machine of low temperature section, constitute another return circuit with heating power oxygen.

3. The novel device for recovering the waste heat of the pyrite-based sulphuric acid production slag according to claim 1, is characterized in that: the slag inlet of the slag inlet pipe of the high-temperature-section slag cooler is communicated with the heat preservation storage tank, the slag outlet of the slag inlet pipe of the high-temperature-section slag cooler is communicated with the slag inlet of the low-temperature-section slag cooler, and the slag outlet of the low-temperature-section slag cooler is provided with a belt conveyor.