CN115350565A - Efficient sulfuric acid waste heat recovery equipment and recovery process thereof - Google Patents
Efficient sulfuric acid waste heat recovery equipment and recovery process thereof Download PDFInfo
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- CN115350565A CN115350565A CN202210818683.6A CN202210818683A CN115350565A CN 115350565 A CN115350565 A CN 115350565A CN 202210818683 A CN202210818683 A CN 202210818683A CN 115350565 A CN115350565 A CN 115350565A
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000011084 recovery Methods 0.000 title claims abstract description 25
- 239000002918 waste heat Substances 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 136
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000010439 graphite Substances 0.000 claims abstract description 97
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 97
- 239000002912 waste gas Substances 0.000 claims abstract description 64
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000002351 wastewater Substances 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 20
- 230000008929 regeneration Effects 0.000 claims description 19
- 238000011069 regeneration method Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 5
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 235000011149 sulphuric acid Nutrition 0.000 claims 1
- 239000001117 sulphuric acid Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 239000008235 industrial water Substances 0.000 abstract description 3
- 239000003345 natural gas Substances 0.000 abstract description 3
- 239000002689 soil Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004148 unit process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses efficient sulfuric acid waste heat recovery equipment and a recovery process thereof, and relates to the technical field of sulfuric acid preparation waste heat recovery. The system comprises a graphite heat exchanger, a water circulating pump I, a water circulating pump II, a water pool and a water cooling tower, wherein the graphite heat exchanger is divided into a first stage and a second stage; the lower side wall of the second stage of the graphite heat exchanger is provided with a waste gas outlet, the bottom of the second stage of the graphite heat exchanger is provided with a condensed waste water outlet, the lower side wall of the second stage of the graphite heat exchanger is provided with a water inlet, the upper side wall of the second stage of the graphite heat exchanger is provided with a water outlet, the water inlet is connected with an outlet of the water pool through a first water circulating pump, and the water outlet is connected with an inlet of the water pool. The invention can obviously reduce the exhaust amount of waste gas, recover a large amount of industrial water, save a large amount of production resources such as natural gas, electric power and the like, has great significance for reducing the cost and improving the production efficiency, and has good promotion effect on the recovery of resources such as heat energy and the like, environmental protection, water and soil conservation and the like.
Description
Technical Field
The invention belongs to the technical field of recovery of waste heat in sulfuric acid preparation, and particularly relates to efficient recovery equipment and a recovery process for waste heat of sulfuric acid.
Background
Various technical means for resource recovery and environmental protection are developed in high-pollution industries such as chemical industry, steel industry and the like so as to meet the requirements of sustainable development, such as the common acid regeneration mode in the steel industry.
The prior acid making process mainly comprises SO 3 The waste heat at low temperature can be recycled, and if the waste heat is directly discharged, the energy waste is easily caused.
Disclosure of Invention
The invention aims to provide a high-efficiency sulfuric acid waste heat recovery device and a recovery process thereof, which solve the problem that the existing acid making process mainly comprises SO 3 The waste heat of the low-temperature positions can be recycled, and if the waste heat is directly discharged, the energy waste is easily caused.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a sulfuric acid waste heat efficient recovery device comprises a graphite heat exchanger, a water circulating pump I, a water circulating pump II, a water tank and a water cooling tower, wherein the graphite heat exchanger is divided into a first stage and a second stage;
the lower side wall of the second stage of the graphite heat exchanger is provided with a waste gas outlet, the bottom of the second stage of the graphite heat exchanger is provided with a condensed waste water outlet, the lower side wall of the second stage of the graphite heat exchanger is provided with a water inlet, the upper side wall of the second stage of the graphite heat exchanger is provided with a water outlet, the water inlet is connected with an outlet of the water pool through a first water circulating pump, and the water outlet is connected with an inlet of the water pool;
and a water outlet of the graphite heat exchanger is provided with a conductivity meter for detecting the Cl ion content in the cooling water and detecting whether the graphite heat exchanger is damaged by leakage.
Optionally, the top of the first stage of the graphite heat exchanger is provided with a waste gas inlet, the lower side wall is provided with a combustion air inlet, the upper side wall is provided with a combustion air outlet, and the combustion air outlet and the waste gas outlet of the graphite heat exchanger are provided with a thermometer and a pressure gauge.
Optionally, the water circulation pump I and the water circulation pump II are provided with a horizontal centrifugal pump and a coupler, and a coupler shield is arranged outside the coupler.
Optionally, the impeller of the horizontal centrifugal pump is made of ultra-high molecular weight polyethylene, and the shaft seal of the coupling is sealed by single mechanical silicon carbide.
Optionally, the number of the graphite heat exchangers is not less than one, and each graphite heat exchanger is provided with a group of water circulating pumps.
A process for efficiently recovering sulfuric acid waste heat comprises the following steps:
conveying combustion-supporting air to a combustion-supporting air inlet of a lower side wall of a first stage of the graphite heat exchanger by a combustion-supporting fan of an acid regeneration unit, reducing the exhaust gas temperature through the temperature difference of the inner wall and the outer wall of a pipeline of the graphite heat exchanger, and cooling the exhaust gas and then feeding the cooled exhaust gas into a second stage of the graphite heat exchanger;
step two, the waste gas cooled by the first stage of the graphite heat exchanger enters a second stage pipeline of the graphite heat exchanger, cooling water in a water pool is conveyed to a water inlet of the graphite heat exchanger through a first water circulating pump and is used for cooling the waste gas in the pipeline, and water vapor and HCl in the waste gas are cooled into liquid state to flow to a condensation waste water outlet at the second stage bottom of the graphite heat exchanger and are used for an absorption tower to absorb water and flow into a water collecting tank of an acid regeneration unit;
step three, the rest waste gas enters a waste gas fan, a liquid drop separator is arranged behind the waste gas fan, gas and liquid are separated, the liquid is separated again and enters a water collecting tank in the process flow of the acid regeneration unit, and the rest waste gas becomes purified gas and is discharged into the atmosphere;
and step four, cooling water of the graphite heat exchanger enters the water pool through a water outlet of the graphite heat exchanger, and a water circulating pump II connected with the water pool sends the water in the water pool into a water cooling tower for cooling.
Optionally, the first step further includes introducing the waste gas treated by the acid regenerator set into the first-stage pipeline of the graphite heat exchanger through a first-stage top waste gas inlet of the graphite heat exchanger.
Optionally, the first step further comprises conveying the combustion-supporting air to the acid regeneration unit from a first-stage combustion-supporting air outlet of the graphite heat exchanger after the temperature of the combustion-supporting air is increased.
Alternatively, the exhaust gas is cooled to 55 ℃ and the combustion air temperature is increased to 55 ℃.
Optionally, the exhaust gas comprises: 50-55% H2O, 35-45% N2, 1-8% CO2, 1-8% O2, an HCl content of 15-44 mg/3Nm, an exhaust of 5700m/h, a water vapor content of 10mg/Nm, an HCl retention: less than or equal to 10mg/Nm.
The embodiment of the invention has the following beneficial effects:
according to one embodiment of the invention, the waste gas cooled by the first stage of the graphite heat exchanger enters a pipeline of the second stage of the graphite heat exchanger, cooling water in a water pool is conveyed to a water inlet of the graphite heat exchanger through a first water circulating pump for cooling the waste gas in the pipeline, and water vapor and HCl in the waste gas are cooled into liquid state to flow into the bottom of the second stage of the graphite heat exchanger for an absorption tower to absorb water and flow into a water collecting tank of an acid regeneration unit; the rest waste gas enters a waste gas fan, a liquid drop separator is arranged behind the waste gas fan, gas and liquid are separated, the liquid is separated again and enters a water collecting tank in the process flow of the acid regeneration unit, the rest waste gas becomes purified gas and is discharged into the atmosphere, the exhaust gas displacement can be obviously reduced, a large amount of industrial water is recovered, a large amount of production resources such as natural gas and electric power can be saved, and the method has great significance for reducing the cost, improving the production efficiency, recovering resources such as heat energy and the like, protecting the environment, maintaining water and soil and the like and has good promoting effect.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of an embodiment of the present invention.
Wherein the figures include the following reference numerals:
the system comprises a graphite heat exchanger 1, a water tank 2, a water circulating pump II 3, a water circulating pump I4 and a water cooling tower 5;
a waste gas inlet 11, a combustion air outlet 12, an air inlet 13, a water outlet 14, a water inlet 15, a waste gas outlet 17 and a condensed waste water outlet 18;
an outlet 21, an inlet 22;
horizontal centrifugal pump 31, shaft coupling guard 32, shaft coupling 33.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
Referring to fig. 1, in this embodiment, an efficient recycling apparatus for waste heat of sulfuric acid is provided, which includes: the system comprises a graphite heat exchanger 1, a water circulating pump I4, a water circulating pump II 3, a water pool 2 and a water cooling tower 5, wherein the graphite heat exchanger 1 is divided into a first stage and a second stage;
a waste gas outlet 17 is formed in the lower side wall of the second stage of the graphite heat exchanger 1, a condensed wastewater outlet 18 is formed in the bottom of the second stage of the graphite heat exchanger, a water inlet 15 is formed in the lower side wall, a water outlet 14 is formed in the upper side wall, the water inlet 15 is connected with an outlet 21 of the water pool 2 through a water circulating pump I4, and the water outlet 14 is connected with an inlet 22 of the water pool 2;
the water outlet 14 of the graphite heat exchanger is provided with a conductivity meter for detecting the content of Cl ions in the cooling water so as to detect whether the graphite heat exchanger is damaged by leakage.
The top of the first level of graphite heat exchanger 1 of this embodiment sets up waste gas air inlet 11, the lower lateral wall sets up combustion air inlet 13, the upper lateral wall sets up combustion air outlet 12, graphite heat exchanger combustion air outlet 12 and waste gas outlet 17 set up thermometer and manometer, water circulating pump one 4, be equipped with centrifugal pump 31 and shaft coupling 33 on the water circulating pump two 3, and the shaft coupling 33 outside is equipped with shaft coupling guard 32, the impeller of centrifugal pump 31 is made by ultra high molecular weight polyethylene, shaft seal of shaft coupling 33 passes through single mechanical carborundum and seals, a set ofly is no less than to graphite heat exchanger quantity, every graphite heat exchanger disposes a set of water circulating pump.
A sulfuric acid waste heat efficient recovery process comprises the following steps:
firstly, introducing waste gas treated by an acid regenerator set into a first-stage pipeline of a graphite heat exchanger 1 through a first-stage top waste gas inlet 11 of the graphite heat exchanger 1, conveying combustion-supporting air to a combustion-supporting air inlet 13 of a first-stage lower side wall of the graphite heat exchanger 1 by a combustion-supporting fan of the acid regenerator set, reducing the discharge temperature of the waste gas through the temperature difference of the inner wall and the outer wall of the pipeline of the graphite heat exchanger 1, and cooling the waste gas to enter a second stage of the graphite heat exchanger 1; wherein, the waste gas is cooled to 55 ℃, the temperature of the combustion-supporting air is increased to 55 ℃, and the waste gas is conveyed to the acid regeneration unit from a first-stage combustion-supporting gas outlet 12 of the graphite heat exchanger 1 after the temperature of the combustion-supporting air is increased;
step two, the waste gas after the first stage cooling of the graphite heat exchanger 1 enters a second stage pipeline of the graphite heat exchanger 1, cooling water in a water pool is conveyed to a water inlet 15 of the graphite heat exchanger through a first water circulating pump and is used for cooling the waste gas in the pipeline, and water vapor and HCl in the waste gas are cooled into liquid state to flow to a condensation waste water outlet 18 at the bottom of the second stage of the graphite heat exchanger and are used for an absorption tower to absorb water and flow into a water collecting tank of an acid regeneration unit;
step three, the rest waste gas enters a waste gas fan, a liquid drop separator is arranged behind the waste gas fan, gas and liquid are separated, the liquid is separated again and enters a water collecting tank in the process flow of the acid regeneration unit, and the rest waste gas becomes purified gas and is discharged into the atmosphere;
and step four, cooling water of the graphite heat exchanger 1 enters the water pool 2 through a water outlet 14 of the graphite heat exchanger 1, and water in the water pool 2 is sent into the water cooling tower 5 to be cooled by a water circulating pump II 3 connected with the water pool 2.
The exhaust gas composition of this example is: 50-55% H2O, 35-45% N2, 1-8% CO2, 1-8% O2, an HCl content of 15-44 mg/3Nm, an exhaust of 5700m/h, a water vapor content of 10mg/Nm, an HCl retention: less than or equal to 10mg/Nm.
The graphite heat exchanger is used for recovering heat energy and condensing water vapor of roasting waste gas. The graphite heat exchanger is divided into an upper stage and a lower stage. The first stage and the second stage of the graphite heat exchanger are both provided with tubular heat exchangers consisting of graphite pipes, the tubular heat exchangers are used for cooling gas and reducing the temperature of waste gas, and the purpose of recovering heat energy, HCI and water is achieved; the upper part of the graphite heat exchanger exchanges heat through combustion air to recover heat energy in the waste gas. Water in the pond is sent into the second level water inlet of each graphite heat exchanger through the graphite heat exchanger water circulating pump that meets with graphite heat exchanger, carry out indirect cooling to waste gas, the second level of graphite heat exchanger retrieves moisture and the HCI who smugglies through the vapor in the condensation waste gas, graphite heat exchanger second level bottom sets up condensation waste water export, moisture and HCI that graphite heat exchanger second level was retrieved pass through graphite heat exchanger bottom condensation waste water export and get into the water catch bowl in the acid regeneration unit process flow, the water that the water catch bowl was collected is absorbed the use by the absorption tower in the acid regeneration unit process flow, the HCl of retrieving gets into the absorption tower along with water and generates the regeneration acid and return pickling unit circulation use.
The waste gas cooled by the first stage of the graphite heat exchanger enters a pipeline of the second stage of the graphite heat exchanger, cooling water in the water pool is conveyed to a water inlet (15) of the graphite heat exchanger through a first water circulating pump and is used for cooling the waste gas in the pipeline, and water vapor and HCl in the waste gas are cooled into liquid state to flow into the bottom of the second stage of the graphite heat exchanger and are used for an absorption tower to absorb water and flow into a water collecting tank of an acid regeneration unit; the rest waste gas enters a waste gas fan, a liquid drop separator is arranged behind the waste gas fan, gas and liquid are separated, the liquid is separated again and enters a water collecting tank in the process flow of the acid regeneration unit, the rest waste gas becomes purified gas and is discharged into the atmosphere, the exhaust gas displacement can be obviously reduced, a large amount of industrial water is recovered, a large amount of production resources such as natural gas and electric power can be saved, and the method has great significance for reducing the cost, improving the production efficiency, recovering resources such as heat energy and the like, protecting the environment, maintaining water and soil and the like and has good promoting effect.
The above embodiments may be combined with each other.
The present invention is not limited to the above-described embodiments, and any structural changes made in the light of the present invention shall fall within the scope of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. The utility model provides a sulphuric acid waste heat high efficiency recovery equipment which characterized in that includes: the device comprises a graphite heat exchanger (1), a water circulating pump I (4), a water circulating pump II (3), a water pool (2) and a water cooling tower (5), wherein the graphite heat exchanger (1) is divided into a first stage and a second stage;
a waste gas outlet (17) is formed in the lower side wall of the second stage of the graphite heat exchanger (1), a condensed waste water outlet (18) is formed in the bottom of the second stage of the graphite heat exchanger, a water inlet (15) is formed in the lower side wall of the second stage of the graphite heat exchanger, a water outlet (14) is formed in the upper side wall of the second stage of the graphite heat exchanger, the water inlet (15) is connected with an outlet (21) of the water pool (2) through a water circulating pump I (4), and the water outlet (14) is connected with an inlet (22) of the water pool (2);
the water outlet (14) of the graphite heat exchanger is provided with a conductivity meter which is used for detecting the Cl ion content in the cooling water and detecting whether the graphite heat exchanger is damaged by leakage.
2. The efficient sulfuric acid waste heat recovery equipment according to claim 1, characterized in that a waste gas inlet (11) is arranged at the top of the first stage of the graphite heat exchanger (1), a combustion-supporting air inlet (13) is arranged on the lower side wall, a combustion-supporting air outlet (12) is arranged on the upper side wall, and a thermometer and a pressure gauge are arranged on the combustion-supporting air outlet (12) and the waste gas outlet (17) of the graphite heat exchanger.
3. The high-efficiency sulfuric acid waste heat recovery device according to claim 1, wherein a horizontal centrifugal pump (31) and a coupler (33) are arranged on the water circulating pump I (4) and the water circulating pump II (3), and a coupler shield (32) is arranged outside the coupler (33).
4. The high-efficiency recovery equipment for the waste heat of sulfuric acid as claimed in claim 3, wherein the impeller of the horizontal centrifugal pump (31) is made of ultra-high molecular weight polyethylene, and the shaft seal of the coupling (33) is sealed by single mechanical silicon carbide.
5. The efficient sulfuric acid waste heat recovery device according to claim 1, wherein the number of the graphite heat exchangers is not less than one, and each graphite heat exchanger is provided with a group of water circulating pumps.
6. The process for efficiently recovering the waste heat of the sulfuric acid is characterized by comprising the following steps of:
firstly, delivering combustion-supporting air to a combustion-supporting air inlet (13) of a first-stage lower side wall of a graphite heat exchanger (1) by a combustion-supporting fan of an acid regeneration unit, reducing the exhaust gas temperature through the temperature difference of the inner wall and the outer wall of a pipeline of the graphite heat exchanger (1), and cooling the exhaust gas to enter a second stage of the graphite heat exchanger (1);
step two, the waste gas after the first-stage cooling of the graphite heat exchanger (1) enters a second-stage pipeline of the graphite heat exchanger (1), cooling water in a water pool is conveyed to a water inlet (15) of the graphite heat exchanger through a first water circulating pump and is used for cooling the waste gas in the pipeline, and water vapor and HCl in the waste gas are cooled into liquid state to flow to a condensation waste water outlet (18) at the bottom of the second stage of the graphite heat exchanger and are used for an absorption tower to absorb water and flow into a water collecting tank of an acid regeneration unit;
step three, the rest waste gas enters a waste gas fan, a liquid drop separator is arranged behind the waste gas fan, gas and liquid are separated, the liquid is separated again and enters a water collecting tank in the process flow of the acid regeneration unit, and the rest waste gas becomes purified gas and is discharged into the atmosphere;
and step four, cooling water of the graphite heat exchanger (1) enters the water pool (2) through a water outlet (14) of the graphite heat exchanger (1), and a water circulating pump II (3) connected with the water pool (2) sends water in the water pool (2) into the water cooling tower (5) for cooling.
7. The efficient sulfuric acid waste heat recovery process according to claim 6, wherein the first step further comprises introducing the waste gas treated by the acid regenerator set into a first-stage pipeline of the graphite heat exchanger (1) through a first-stage top waste gas inlet (11) of the graphite heat exchanger (1).
8. The efficient sulfuric acid waste heat recovery process according to claim 6, wherein the first step further comprises conveying the combustion air to the acid regeneration unit from a first-stage combustion-supporting gas outlet (12) of the graphite heat exchanger (1) after the temperature of the combustion-supporting air is increased.
9. The efficient sulfuric acid waste heat recovery process according to claim 6, wherein the exhaust gas is cooled to 55 ℃ and the combustion air temperature is raised to 55 ℃.
10. The efficient sulfuric acid waste heat recovery process according to claim 6, wherein the waste gas comprises the following components: 50-55% H2O, 35-45% N2, 1-8% CO2, 1-8% O2, an HCl content of 15-44 mg/3Nm, an exhaust of 5700m/h, a water vapor content of 10mg/Nm, an HCl retention: less than or equal to 10mg/Nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN104645790A (en) * | 2015-02-10 | 2015-05-27 | 成都阿斯特克国龙环保工程有限公司 | Smoke purification system and method for pickling line |
| CN104654874A (en) * | 2015-02-10 | 2015-05-27 | 成都阿斯特克国龙环保工程有限公司 | Acid and acid regeneration unit waste gas residual heat recovery and waste gas processing system and method |
| CN107774005A (en) * | 2017-11-28 | 2018-03-09 | 成都阿斯特克国龙环保工程有限公司 | A kind of exhaust treatment system and method for acid regeneration unit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104645790A (en) * | 2015-02-10 | 2015-05-27 | 成都阿斯特克国龙环保工程有限公司 | Smoke purification system and method for pickling line |
| CN104654874A (en) * | 2015-02-10 | 2015-05-27 | 成都阿斯特克国龙环保工程有限公司 | Acid and acid regeneration unit waste gas residual heat recovery and waste gas processing system and method |
| CN107774005A (en) * | 2017-11-28 | 2018-03-09 | 成都阿斯特克国龙环保工程有限公司 | A kind of exhaust treatment system and method for acid regeneration unit |
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