CN110395691B - Regeneration system and regeneration method for waste acid containing tar - Google Patents

Regeneration system and regeneration method for waste acid containing tar Download PDF

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Publication number
CN110395691B
CN110395691B CN201910598745.5A CN201910598745A CN110395691B CN 110395691 B CN110395691 B CN 110395691B CN 201910598745 A CN201910598745 A CN 201910598745A CN 110395691 B CN110395691 B CN 110395691B
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communicated
pipeline
tower
hydrochloric acid
concentration
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CN110395691A (en
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陆俊
陈燕
缪世阳
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Nantong Star Graphite Co ltd
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Nantong Star Graphite Co ltd
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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
    • B01D53/1406—Multiple stage absorption
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/01—Chlorine; Hydrogen chloride
    • C01B7/07—Purification ; Separation
    • C01B7/0706—Purification ; Separation of hydrogen chloride
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/08—Thin film evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/204—Inorganic halogen compounds
    • B01D2257/2045—Hydrochloric acid
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds

Abstract

The invention relates to a regeneration system and a regeneration method of waste acid containing tar, wherein the treatment system comprises an evaporation system, a concentration system and a desorption and absorption system, and the evaporation system comprises an evaporation feed preheater, a film evaporator, a residue buffer tank, a demister, an evaporation condensation water tank and a desorption tower preheater; the concentration system comprises a concentration tower, a concentration reboiler, a concentration condensation water tank, a first-stage condenser at the top of the concentration tower, a second-stage condenser at the top of the concentration tower, a vacuum buffer tank and a water flow jet pump vacuum unit; the analysis and absorption system comprises an analysis tower, an analysis tower reboiler, an analysis condensate water tank, an analysis tower top condenser, a primary falling film absorber, a secondary falling film absorber, a tail gas absorption tower, a concentrated acid cooler and a hydrochloric acid tank. The invention has the advantages that: the regeneration system of waste acid containing tar can reduce the sewage treatment cost and improve the resource utilization.

Description

Regeneration system and regeneration method for waste acid containing tar
Technical Field
The invention relates to the field of waste acid treatment, in particular to a regeneration system and a regeneration method for waste acid containing tar.
Background
In chemical production, waste hydrochloric acid is often generated, and the waste acid contains impurities, such as tar, which cannot be directly recycled, and is usually directly discharged into a sewage tank for treatment, so that the waste of resources is caused, and the sewage treatment cost is increased.
Therefore, it is necessary to develop a regeneration system and a regeneration method for waste acid containing tar, which can reduce the cost of sewage treatment and improve the resource utilization.
Disclosure of Invention
The invention aims to provide a system and a method for regenerating waste acid containing tar, which can reduce the sewage treatment cost and improve the resource utilization.
In order to solve the technical problems, the technical scheme of the invention is as follows: a regeneration system containing tar waste acid is characterized in that: the regeneration system comprises an evaporation system, a concentration system and a desorption and absorption system, the evaporation system comprises an evaporation feed preheater, a thin film evaporator, a residue buffer tank, a demister, an evaporation condensate water tank and a desorption tower preheater,
a feed inlet A communicated with the evaporation feed preheater is formed in the center of the bottom end of the evaporation feed preheater, a discharge outlet A communicated with the evaporation feed preheater is formed in the center of the top end of the evaporation feed preheater, and a condensate water outlet pipeline A and a condensate water inlet pipeline A communicated with the evaporation feed preheater are sequentially arranged at the side end of the evaporation feed preheater from top to bottom;
the outer side wall of the thin film evaporator is provided with a jacket, a feed inlet B1 and a discharge outlet B1 which are communicated with the thin film evaporator are respectively arranged on two sides of the top end of the thin film evaporator, a feed inlet B2 which is communicated with the thin film evaporator is arranged on the side part of the upper end of the thin film evaporator, a discharge outlet B2 which is communicated with the thin film evaporator is arranged in the center of the bottom end of the thin film evaporator, a saturated steam inlet pipeline A and a condensed water outlet pipeline B which are communicated with the jacket are sequentially arranged on the jacket from top to bottom, and the other end of the condensed water outlet pipeline B is also communicated with an evaporation condensed water tank;
a feed inlet C communicated with the residue buffer tank is formed in the center of the top end of the residue buffer tank, and a discharge outlet C communicated with the residue buffer tank is formed in the center of the bottom end of the residue buffer tank;
a feed inlet D communicated with the demister is formed in the center of the bottom end of the demister, a hydrogen chloride/water mixed gas discharge pipeline A communicated with the demister is formed in the center of the top end of the demister, and a discharge outlet D communicated with the demister is formed in the side end of the bottom of the demister;
a saturated steam inlet pipeline B communicated with the evaporation condensation water tank is arranged in the center of the top end of the evaporation condensation water tank, and the other end of the saturated steam inlet pipeline B is communicated with the saturated steam inlet pipeline A; a condensed water inlet pipeline C and a condensed water outlet pipeline C which are communicated with the evaporation condensed water tank are sequentially arranged at the side end of the evaporation condensed water tank from top to bottom;
a concentrated hydrochloric acid discharge pipeline A communicated with the preheater of the resolution tower is arranged in the center of the top end of the preheater of the resolution tower, and a concentrated hydrochloric acid feed pipeline A communicated with the preheater of the resolution tower is arranged in the center of the bottom end of the preheater of the resolution tower; the upper end of one side of the desorption tower preheater is communicated with a condensed water outlet pipeline C through a connecting pipe A, and the lower end of the other side of the desorption tower preheater is communicated with the condensed water outlet pipeline C through a connecting pipe B;
the discharge port A is communicated with the feed port B1 through a pipeline A, the discharge port B2 is communicated with the feed port C through a pipeline B, the discharge port B1 is communicated with the feed port D through a pipeline C, and the discharge port D is communicated with the feed port B2 through a pipeline D;
the concentration system comprises a concentration tower, a concentration reboiler, a concentration condensate water tank, a first-stage condenser at the top of the concentration tower, a second-stage condenser at the top of the concentration tower, a vacuum buffer tank and a water jet pump vacuum unit,
the center of the top end of the concentration tower is provided with an acid gas outlet A communicated with the concentration tower, the center of the bottom end of the concentration tower is provided with a concentrated hydrochloric acid discharge pipeline B communicated with the concentration tower, and the concentrated hydrochloric acid discharge pipeline B is communicated with a concentrated hydrochloric acid feeding pipeline A; a concentrated hydrochloric acid discharge pipeline E is communicated with and arranged on the concentrated hydrochloric acid discharge pipeline B, and a concentration tower discharge pump is also connected in series on the concentrated hydrochloric acid discharge pipeline B; a dilute hydrochloric acid feeding pipeline A, a hydrogen chloride/water mixed gas feeding pipeline A and an acid gas discharging pipeline A which are communicated with the concentration tower are sequentially arranged at one side end of the concentration tower from top to bottom, the hydrogen chloride/water mixed gas feeding pipeline A is communicated with the hydrogen chloride/water mixed gas discharging pipeline A, a hydrogen chloride tail gas feeding pipe is further communicated with the hydrogen chloride/water mixed gas feeding pipeline A, and an acid wastewater discharging pipe A communicated with the concentration tower is arranged at the upper part of the other side end of the concentration tower;
the top end of the reboiler of the concentration tower is communicated with the acidic gas discharge pipeline A through a connecting pipe C, and the bottom end of the reboiler of the concentration tower is communicated with the concentrated hydrochloric acid discharge pipeline B through a connecting pipe D; a saturated steam inlet pipeline C, a condensed water outlet A1 and a condensed water outlet A2 which are communicated with the concentration reboiler are sequentially arranged at one side end of the concentration tower reboiler from top to bottom;
a condensed water inlet A1 communicated with the condensed water tank is formed in the center of the top end of the condensed water tank, an acid gas discharge pipeline B and a condensed water outlet pipeline A which are communicated with the condensed water tank are sequentially arranged at one side end of the condensed water tank from top to bottom, and the condensed water outlet pipeline A is communicated with a condensed water inlet pipeline A; the upper part of the other side end of the condensed water tank is provided with a condensed water inlet A2 communicated with the condensed water tank;
the condensed water outlet A1 is communicated with the condensed water inlet A1 through a connecting pipe E, and the condensed water outlet A2 is communicated with the condensed water inlet A2 through a connecting pipe F;
the center of the top end of the first-stage condenser at the top of the concentration tower is provided with an acid gas inlet A communicated with the first-stage condenser at the top of the concentration tower, the center of the bottom end of the first-stage condenser at the top of the concentration tower is provided with an acid wastewater discharge pipe B communicated with the first-stage condenser at the top of the concentration tower, the other end of the acid wastewater discharge pipe B is communicated with the acid wastewater discharge pipe A, and the acid wastewater discharge pipe B is also provided with a vacuum condensation wastewater pump in series; the side end of the first-stage condenser at the top of the concentration tower is sequentially provided with a circulating water outlet pipeline A and a circulating water inlet pipeline A from top to bottom, and the lower part of the other side end of the first-stage condenser at the top of the concentration tower is provided with an acid gas outlet A communicated with the first-stage condenser at the top of the concentration tower;
the center of the top end of the second-stage condenser at the top of the concentrating tower is provided with an acid gas inlet B communicated with the second-stage condenser at the top of the concentrating tower, and the acid gas inlet B is communicated with an acid gas outlet A through a connecting pipe G; an acid wastewater discharge pipe C communicated with the second-stage condenser at the top of the concentration tower is arranged in the center of the bottom end of the second-stage condenser at the top of the concentration tower, and the other end of the acid wastewater discharge pipe C is communicated with an acid wastewater discharge pipe B; a circulating water outlet pipeline B and a circulating water inlet pipeline B are sequentially arranged at the side end of the second-stage condenser at the top of the concentration tower from top to bottom, and a vacuum-pumping pipeline A communicated with the second-stage condenser at the top of the concentration tower is arranged at the lower part of the other side end of the second-stage condenser at the top of the concentration tower;
a vacuumizing pipeline B communicated with the vacuum buffer tank is arranged in the center of the top end of the vacuum buffer tank, and the other end of the vacuumizing pipeline B is communicated with a connecting pipe G; an acidic wastewater discharge pipe D communicated with the vacuum buffer tank is arranged on the side part of the top end of the vacuum buffer tank, and the other end of the acidic wastewater discharge pipe D is communicated with the acidic wastewater discharge pipe A; two sides of the lower end of the vacuum buffer tank are respectively communicated with an acidic wastewater discharge pipe B and an acidic wastewater discharge pipe C through a connecting pipe H and a connecting pipe I, and the acidic wastewater discharge pipe A is also communicated with an acidic wastewater discharge pipe E;
the water jet pump vacuum unit is communicated with the vacuumizing pipeline A, the water jet pump vacuum unit is also communicated with an emptying pipeline A, and an emptying pipeline B is also communicated between the vacuumizing pipeline A and the emptying pipeline A; the water jet pump vacuum unit is also communicated with an industrial water inlet pipeline and is sequentially provided with a circulating water outlet pipeline C and a circulating water inlet pipeline C from top to bottom;
the analysis and absorption system comprises an analysis tower, an analysis tower reboiler, an analysis condensate water tank, an analysis tower top condenser, a primary falling film absorber, a secondary falling film absorber, a tail gas absorption tower, a concentrated acid cooler and a hydrochloric acid tank,
a hydrogen chloride gas outlet A communicated with the desorption tower is formed in the center of the top end of the desorption tower, the upper part of one side end of the desorption tower is communicated with a concentrated hydrochloric acid discharge pipeline A on a preheater of the desorption tower, and a hydrogen chloride/water mixed gas discharge pipeline B communicated with the top ends of the desorption tower and a reboiler of the desorption tower is formed in the lower part of one side end of the desorption tower; a dilute hydrochloric acid feeding pipeline B communicated with the bottom of the desorption tower and the bottom of a reboiler of the desorption tower is arranged in the center of the bottom of the desorption tower; the lower part of the other side end of the desorption tower is communicated with a dilute hydrochloric acid feeding pipeline A on the concentration tower, and a liquid level flow control valve is also arranged on the dilute hydrochloric acid feeding pipeline A in series and is close to the concentration tower;
a saturated steam inlet pipeline D, a condensed water outlet B1 and a condensed water outlet B2 which are communicated with the desorption reboiler are sequentially arranged at one side end of the desorption reboiler from top to bottom;
a condensate water inlet B1 communicated with the analytic condensate water tank is formed in the center of the top end of the analytic condensate water tank, a condensate water inlet B2 communicated with the analytic condensate water tank is formed in the upper portion of the side end of the analytic condensate water tank, and the lower portion of the other side end of the analytic condensate water tank is communicated with a condensate water inlet pipeline C on the evaporation condensate water tank; the condensed water outlet B1 is communicated with a condensed water inlet B1 through a connecting pipe H, and the condensed water outlet B2 is communicated with a condensed water inlet B2 through a connecting pipe I;
a hydrogen chloride gas inlet A communicated with the analysis tower top condenser is formed in the center of the top end of the analysis tower top condenser, a concentrated hydrochloric acid discharge pipeline C communicated with the analysis tower top condenser is formed in the center of the bottom end of the analysis tower top condenser, a hydrogen chloride gas outlet B communicated with the analysis tower top condenser is formed in the lower portion of one side end of the analysis tower top condenser, a circulating water outlet pipeline D and a circulating water inlet pipeline D communicated with the analysis tower top condenser are sequentially formed in the other side end of the analysis tower top condenser from top to bottom, and the hydrogen chloride gas outlet A is communicated with the hydrogen chloride gas inlet A through the hydrogen chloride gas pipeline A;
a hydrogen chloride gas inlet B, a circulating water outlet pipeline E and a circulating water inlet pipeline E which are communicated with the primary falling film absorber are sequentially arranged at one side end of the primary falling film absorber from top to bottom, and the hydrogen chloride gas outlet B is communicated with the hydrogen chloride gas inlet B through a hydrogen chloride gas pipeline B; the other side end of the primary falling film absorber is sequentially provided with a concentrated hydrochloric acid feeding pipeline D and a hydrogen chloride gas outlet C which are communicated with the primary falling film absorber from top to bottom; a concentrated hydrochloric acid discharge pipeline D communicated with the primary falling film absorber is arranged in the center of the bottom end of the primary falling film absorber, and the other end of the concentrated hydrochloric acid discharge pipeline D is communicated with a concentrated hydrochloric acid discharge pipeline C;
a hydrogen chloride gas inlet C, a circulating water outlet pipeline F and a circulating water inlet pipeline F which are communicated with the secondary falling film absorber are sequentially arranged at one side end of the secondary falling film absorber from top to bottom, and the hydrogen chloride gas outlet C is communicated with the hydrogen chloride gas inlet C through the hydrogen chloride gas pipeline C; the other side end of the secondary falling film absorber is sequentially provided with a concentrated hydrochloric acid feeding pipeline C and a hydrogen chloride gas outlet D which are communicated with the secondary falling film absorber from top to bottom; the center of the bottom end of the secondary falling film absorber is communicated with a concentrated hydrochloric acid feeding pipeline D on the primary falling film absorber;
a hydrogen chloride gas inlet D communicated with the tail gas absorption tower is formed in the lower part of one side end of the tail gas absorption tower, and the hydrogen chloride gas outlet D is communicated with the hydrogen chloride gas inlet D through a hydrogen chloride gas pipeline D; a concentrated hydrochloric acid feeding pipeline B communicated with the tail gas absorption tower is arranged at the upper part of the other side end of the tail gas absorption tower, the center of the top end of the tail gas absorption tower is communicated with a hydrogen chloride tail gas feeding pipe on a hydrogen chloride/water mixed gas feeding pipeline A, a pressure flow control valve is also arranged on the hydrogen chloride tail gas feeding pipe in series, and the pressure flow control valve is arranged close to the concentration tower; the center of the bottom end of the tail gas absorption tower is communicated with a concentrated hydrochloric acid feeding pipeline C on the secondary falling film absorber;
the center of the top end of the concentrated acid cooler is communicated with a concentrated hydrochloric acid feeding pipeline B on the tail gas absorption tower, and the center of the bottom end of the concentrated acid cooler is communicated with a concentrated hydrochloric acid discharging pipeline E on a concentrated hydrochloric acid discharging pipeline B; a circulating water outlet pipeline G and a circulating water inlet pipeline G which are communicated with the concentrated acid cooler are sequentially arranged at one side end of the concentrated acid cooler from top to bottom;
the upper end of the hydrochloric acid tank is communicated with a concentrated hydrochloric acid discharge pipeline C on a condenser at the top of the analysis tower, and a hydrogen chloride gas pipeline E is also communicated between the upper end of the hydrochloric acid tank and the hydrogen chloride gas pipeline C; and a concentrated hydrochloric acid discharging pipeline F communicated with the hydrochloric acid tank is arranged at the lower part of one side end of the hydrochloric acid tank, and a hydrochloric acid discharging pump is also arranged on the concentrated hydrochloric acid discharging pipeline F in series.
Three film evaporators are arranged on the pipeline A in parallel.
And two residue buffer tanks are arranged on the pipeline B in parallel.
Two discharge pumps of the concentration tower are arranged on a concentrated hydrochloric acid discharge pipeline B in parallel.
The vacuum condensation waste water pump has two, parallelly connected setting between acid waste water discharging pipe A and acid waste water discharging pipe B.
The three water jet pump vacuum units are arranged on the vacuum-pumping pipeline A in parallel.
The two hydrochloric acid discharge pumps are arranged on the concentrated hydrochloric acid discharge pipeline F in parallel.
The regeneration method comprises the following steps:
a) preheating waste acid containing tar, introducing the waste acid containing the tar into an evaporation feed preheater to exchange heat with a high-temperature medium to heat to 75-85 ℃, and introducing the preheated waste acid containing the tar into a film evaporator so as to evaporate high-purity hydrogen chloride gas out of the waste acid through steam;
b) evaporating the waste acid containing tar by a film evaporator to generate hydrogen chloride/water mixed gas and tar residues, and sending the tar residues to residue buffer for subsequent treatment;
c) introducing the hydrogen chloride/water mixed gas generated in the step b) into a demister for defoaming treatment, introducing the hydrogen chloride/water mixed gas subjected to defoaming treatment into a concentration tower at the flow rate of 2/3 containing the flow rate of tar waste acid, and introducing dilute hydrochloric acid into the concentration tower, wherein the volume ratio of the introduced dilute hydrochloric acid to the mixed gas is 2: 1, carrying out concentration reaction on the hydrogen chloride/water mixed gas and dilute hydrochloric acid, wherein the pressure in a concentration tower is-0.096 Mpa;
d) after the concentration reaction is finished, hydrochloric acid with the mass percentage concentration of 23% and heavy component gas are generated at the bottom of the concentration tower, and then the hydrochloric acid with the mass percentage concentration of 23% is conveyed and stored through a discharge pump of the concentration tower for later use; introducing heavy component gas into a reboiler of a concentration tower at 1/3 flow rate of tar-containing waste acid flow rate, concentrating and reboiling to obtain hydrochloric acid with mass percentage concentration of 23%, and conveying and storing through a discharge pump of the concentration tower; the steam pressure of a reboiler of the concentration tower is 0.4Mpa, and the temperature is controlled at 120 ℃;
e) after the concentration reaction is finished, generating acid wastewater and light component gas at the top of a concentration tower, then sequentially passing the light component gas through a first-stage condenser at the top of the concentration tower and a second-stage condenser at the top of the concentration tower for condensation treatment, and combining with vacuumizing treatment, wherein in the treatment process, the generated acid wastewater and the acid wastewater generated at the top of the concentration tower are collected together in a centralized manner for subsequent treatment;
f) conveying the hydrochloric acid with the mass percentage concentration of 23% obtained in the step d) to an analysis tower through a discharge pump of the concentration tower, heating to 115-120 ℃, generating diluted hydrochloric acid, hydrogen chloride gas and hydrogen chloride/water mixed gas, evaporating and separating the hydrogen chloride/water mixed gas in the hydrochloric acid with the mass percentage concentration of 23% through an analysis reboiler at the bottom of the analysis tower, condensing the gas in an analysis condensation water tank, and introducing the condensed hydrogen chloride gas into the analysis tower again for repeated cyclic analysis;
g) f) introducing the dilute hydrochloric acid generated in the step f) into a concentration tower for carrying out concentration reaction again, introducing the generated hydrogen chloride gas into a condenser at the top of an analysis tower for condensation, introducing the generated hydrochloric acid with the mass percentage concentration of 30% into a hydrochloric acid tank for storage, and sequentially introducing the hydrogen chloride gas generated in the condensation process into a primary falling film absorber and a secondary falling film absorber;
h) and (3) sequentially introducing hydrochloric acid in a concentrated hydrochloric acid discharge pipe E into a concentrated acid cooler, a tail gas absorption tower, a secondary falling film absorber and a primary falling film absorber, carrying out absorption reaction with hydrogen chloride gas, finally introducing hydrochloric acid with the mass percentage concentration of 30% generated in the primary falling film absorber into a hydrochloric acid tank for storage, and introducing hydrogen chloride tail gas generated in the tail gas absorption tower into a concentration tower to participate in the concentration reaction.
The invention has the advantages that:
(1) according to the regeneration system of waste acid containing tar, the waste acid containing tar is sent to an evaporation system and is evaporated to obtain hydrogen chloride/water mixed gas and tar residues, and the tar residues are loaded and treated in a centralized manner; the hydrogen chloride/water mixed gas obtained by evaporation is sent to a concentration system, and is subjected to concentration reaction with additional dilute hydrochloric acid to obtain concentrated hydrochloric acid A by concentration; finally, the concentrated hydrochloric acid A is sent to an analysis and absorption system to be analyzed and absorbed, so that concentrated hydrochloric acid B with higher concentration is obtained, hydrogen chloride/water mixed gas obtained in the evaporation process and hydrogen chloride/water mixed gas obtained in the analysis process can be fully recycled, an effective concentrated hydrochloric acid finished product is obtained, tar-containing waste acid can be regenerated, and resource utilization is improved; meanwhile, in the treatment process, the generation of sewage is reduced, so that the sewage treatment cost can be reduced;
(2) according to the regeneration system for waste acid containing tar, disclosed by the invention, a plurality of film evaporators, a residue buffer tank, a discharge pump of a concentration tower, a vacuum condensation waste water pump and a hydrochloric acid discharge pump are arranged in parallel, so that the treatment efficiency of the whole regeneration system for waste acid containing tar can be greatly improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of the structure of an evaporation system in a regeneration system of waste acid containing tar according to the present invention.
FIG. 2 is a schematic diagram of the configuration of a concentration system in a regeneration system for waste acid containing tar according to the present invention.
FIG. 3 is a schematic diagram of the desorption and absorption system in the regeneration system of waste acid containing tar according to the present invention.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Examples
The regeneration system of the waste acid containing tar comprises an evaporation system, a concentration system and a desorption and absorption system.
An evaporation system, as shown in fig. 1, comprising an evaporation feed preheater 1, a thin film evaporator 2, a residue surge tank 3, a demister 4, an evaporation condensate water tank 5, and a desorption tower preheater 6; the bottom center of evaporation feed preheater 1 is equipped with the feed inlet 101A with evaporation feed preheater 1 intercommunication, and the top center of evaporation feed preheater 1 is equipped with the discharge gate 102A with evaporation feed preheater 1 intercommunication, and evaporation feed preheater 1's side top-down has set gradually the comdenstion water outlet conduit A and the comdenstion water inlet pipe way A (from the concentrated condensate water jar) with evaporation feed preheater intercommunication 1.
The outer side wall of the thin film evaporator 2 is provided with a jacket 201, two sides of the top end of the thin film evaporator 2 are respectively provided with a feed inlet 202B1 and a discharge outlet 203B1 which are communicated with the thin film evaporator 2, the side part of the upper end of the thin film evaporator 2 is provided with a feed inlet 202B2 which is communicated with the thin film evaporator 2, the center of the bottom end of the thin film evaporator 2 is provided with a discharge outlet 203B2 which is communicated with the thin film evaporator 2, the jacket 201 is sequentially provided with a saturated steam inlet pipeline A and a condensed water outlet pipeline B which are communicated with the jacket 201 from top to bottom, and the other end of the condensed water outlet pipeline B is also communicated with an evaporation condensed water tank 5.
The top center of residue buffer tank 3 is equipped with the feed inlet 301C with residue buffer tank 3 intercommunication, and the bottom center of residue buffer tank 3 is equipped with the discharge gate 302C with residue buffer tank 3 intercommunication.
The bottom center of demister 4 is equipped with the feed inlet 401D with demister 4 intercommunication, and the top center of demister 4 is equipped with the hydrogen chloride/water mist discharge pipeline A with demister 4 intercommunication, and the bottom side of demister 4 is equipped with the discharge gate 402D with demister 4 intercommunication.
A saturated steam inlet pipeline B communicated with the evaporation condensed water tank 5 is arranged in the center of the top end of the evaporation condensed water tank 5, and the other end of the saturated steam inlet pipeline B is communicated with the saturated steam inlet pipeline A; a condensed water inlet pipeline C (from the analysis condensed water tank) and a condensed water outlet pipeline C which are communicated with the evaporation condensed water tank are sequentially arranged at the side end of the evaporation condensed water tank 5 from top to bottom.
A concentrated hydrochloric acid discharge pipeline A (a desorption tower) communicated with the desorption tower preheater 6 is arranged in the center of the top end of the desorption tower preheater 6, and a concentrated hydrochloric acid feed pipeline A (from a concentration tower discharge pump) communicated with the desorption tower preheater 6 is arranged in the center of the bottom end of the desorption tower preheater 6; the upper end of one side of the desorption tower preheater 6 is communicated with a condensed water outlet pipeline C through a connecting pipe A, and the lower end of the other side of the desorption tower preheater 6 is communicated with the condensed water outlet pipeline C through a connecting pipe B; the discharge port 102A is communicated with the feed port 202B1 through a pipeline A, the discharge port 203B2 is communicated with the feed port 301C through a pipeline B, the discharge port 203B1 is communicated with the feed port 401D through a pipeline C, and the discharge port 402D is communicated with the feed port 202B2 through a pipeline D.
As an example, the specific embodiment is that there are three thin film evaporators 2, which are arranged in parallel on the pipeline a; two residue buffer tanks 3 are arranged on the pipeline B in parallel.
The concentration system, as shown in fig. 2, includes a concentration tower 7, a concentration reboiler 8, a concentration condensed water tank 9, a concentration tower top primary condenser 10, a concentration tower top secondary condenser 11, a vacuum buffer tank 12 and a water jet pump vacuum unit 13.
An acid gas outlet 701A communicated with the concentration tower 7 is formed in the center of the top end of the concentration tower 7, a concentrated hydrochloric acid discharging pipeline B communicated with the concentration tower 7 is formed in the center of the bottom end of the concentration tower 7, and the concentrated hydrochloric acid discharging pipeline B is communicated with a concentrated hydrochloric acid feeding pipeline A; a concentrated hydrochloric acid discharge pipeline E (a concentrated acid cooler) is communicated with the concentrated hydrochloric acid discharge pipeline B, and a concentration tower discharge pump 702 is also connected in series with the concentrated hydrochloric acid discharge pipeline B; in the embodiment, in specific implementation, two discharge pumps 702 of the concentration tower are arranged on a discharge pipeline B of concentrated hydrochloric acid in parallel; one side end top-down of concentrated tower 7 is equipped with in proper order with the dilute hydrochloric acid charge-in pipeline A (or come from the analytic tower), hydrogen chloride/water mist charge-in pipeline A and the acid gas ejection of compact pipeline A of concentrated tower 7 intercommunication, and hydrogen chloride/water mist charge-in pipeline A and hydrogen chloride/water mist ejection of compact pipeline A intercommunication setting, still the intercommunication is provided with hydrogen chloride tail gas inlet pipe (from the tail gas absorption tower) on the hydrogen chloride/water mist charge-in pipeline A, and the upper portion of the other side of concentrated tower 7 is equipped with the acid waste water discharging pipe A who communicates with concentrated tower 7.
The top end of the concentration tower reboiler 8 is communicated with the acid gas discharge pipeline A through a connecting pipe C, and the bottom end of the concentration tower reboiler 8 is communicated with the concentrated hydrochloric acid discharge pipeline B through a connecting pipe D; a saturated steam inlet pipeline C, a condensed water outlet 801A1 and a condensed water outlet 801A2 which are communicated with the concentration reboiler 8 are sequentially arranged at one side end of the concentration tower reboiler 8 from top to bottom.
A condensed water inlet 901A1 communicated with the condensed water tank 9 is formed in the center of the top end of the condensed water tank 9, an acid gas discharge pipeline B and a condensed water outlet pipeline A communicated with the condensed water tank 9 are sequentially arranged at one side end of the condensed water tank 9 from top to bottom, and the condensed water outlet pipeline A is communicated with the condensed water inlet pipeline A; the upper part of the other side end of the condensed water concentrating tank 9 is provided with a condensed water inlet 901A2 communicated with the condensed water concentrating tank 9.
The condensed water outlet 801a1 is communicated with the condensed water inlet 901a1 through a connecting pipe E, and the condensed water outlet 801a2 is communicated with the condensed water inlet 901a2 through a connecting pipe F.
The center of the top end of the first-stage condenser 10 at the top of the concentration tower is provided with an acid gas inlet 1001A communicated with the first-stage condenser 10 at the top of the concentration tower, the center of the bottom end of the first-stage condenser 10 at the top of the concentration tower is provided with an acid wastewater discharge pipe B communicated with the first-stage condenser 10 at the top of the concentration tower, the other end of the acid wastewater discharge pipe B is communicated with the acid wastewater discharge pipe A, the acid wastewater discharge pipe B is also provided with a vacuum condensation wastewater pump 1002 in series, and the two vacuum condensation wastewater pumps 1002 are arranged between the acid wastewater discharge pipe A and the acid wastewater discharge pipe B in parallel; the side end of the first-stage condenser 10 at the top of the concentrating tower is sequentially provided with a circulating water outlet pipeline A and a circulating water inlet pipeline A from top to bottom, and the lower part of the other side end of the first-stage condenser 10 at the top of the concentrating tower is provided with an acid gas outlet 1003A communicated with the first-stage condenser 10 at the top of the concentrating tower.
The center of the top end of the concentration tower top secondary condenser 11 is provided with an acid gas inlet 1101B communicated with the concentration tower top secondary condenser 11, and the acid gas inlet 1101B is communicated with an acid gas outlet 1003A through a connecting pipe G; an acid wastewater discharge pipe C communicated with the concentration tower top secondary condenser 11 is arranged in the center of the bottom end of the concentration tower top secondary condenser 11, and the other end of the acid wastewater discharge pipe C is communicated with an acid wastewater discharge pipe B; the side end of the second-stage condenser 11 at the top of the concentrating tower is sequentially provided with a circulating water outlet pipeline B and a circulating water inlet pipeline B from top to bottom, and the lower part of the other side end of the second-stage condenser 11 at the top of the concentrating tower is provided with a vacuum-pumping pipeline A communicated with the second-stage condenser 11 at the top of the concentrating tower.
A vacuumizing pipeline B communicated with the vacuum buffer tank 12 is arranged in the center of the top end of the vacuum buffer tank 12, and the other end of the vacuumizing pipeline B is communicated with a connecting pipe G; an acidic wastewater discharge pipe D communicated with the vacuum buffer tank 12 is arranged on the side part of the top end of the vacuum buffer tank 12, and the other end of the acidic wastewater discharge pipe D is communicated with the acidic wastewater discharge pipe A; the two sides of the lower end of the vacuum buffer tank 12 are respectively communicated with an acidic wastewater discharge pipe B and an acidic wastewater discharge pipe C through a connecting pipe H and a connecting pipe I, and an acidic wastewater discharge pipe E (a concentrated acid cooler) is also communicated with the acidic wastewater discharge pipe A.
The three water jet pump vacuum units 13 are arranged on the vacuumizing pipeline A in parallel; the water jet pump vacuum unit 13 is also provided with a vent pipeline A (from a residue buffer tank) in a communication way, and a vent pipeline B is also arranged between the vacuumizing pipeline A and the vent pipeline A in a communication way; the water jet pump vacuum unit 13 is also communicated with an industrial water inlet pipeline, and the water jet pump vacuum unit 13 is sequentially provided with a circulating water outlet pipeline C and a circulating water inlet pipeline C from top to bottom.
As shown in fig. 3, the desorption and absorption system includes a desorption tower 14, a desorption tower reboiler 15, a desorption condensate water tank 16, a desorption tower top condenser 17, a primary falling film absorber 18, a secondary falling film absorber 19, a tail gas absorption tower 20, a concentrated acid cooler 21, and a hydrochloric acid tank 22.
A hydrogen chloride gas outlet 1401A communicated with the analysis tower 14 is arranged at the center of the top end of the analysis tower 14, the upper part of one side end of the analysis tower 14 is communicated with a concentrated hydrochloric acid discharge pipeline A on the analysis tower preheater 6, and the lower part of one side end of the analysis tower 14 is provided with a hydrogen chloride/water mixed gas discharge pipeline B communicated with the top ends of the analysis tower 14 and an analysis tower reboiler 15; a dilute hydrochloric acid feeding pipeline B communicated with the bottom ends of the desorption tower 14 and a desorption tower reboiler 15 is arranged in the center of the bottom end of the desorption tower 14; the lower part of the other side end of the desorption tower 14 is communicated with a dilute hydrochloric acid feeding pipeline A on the concentration tower 7, a liquid level flow control valve 1402 is further arranged on the dilute hydrochloric acid feeding pipeline A in series, and the liquid level flow control valve 1402 is arranged close to the concentration tower 7.
A saturated steam inlet pipe D, a condensed water outlet 1501B1 and a condensed water outlet 1501B2 which are communicated with the desorption reboiler 15 are sequentially arranged at one side end of the desorption reboiler 15 from top to bottom.
A condensate water inlet 1601B1 communicated with the analysis condensate water tank 16 is arranged at the center of the top end of the analysis condensate water tank 16, a condensate water inlet 1601B2 communicated with the analysis condensate water tank 16 is arranged at the upper part of the side end of the analysis condensate water tank 16, and the lower part of the other side end of the analysis condensate water tank 16 is communicated with a condensate water inlet pipeline C on the evaporation condensate water tank 5; the condensed water outlet 1501B1 is communicated with the condensed water inlet 1601B1 through a connecting pipe J, and the condensed water outlet 1501B2 is communicated with the condensed water inlet 1601B2 through a connecting pipe K.
The center of the top end of the analysis tower top condenser 17 is provided with a hydrogen chloride gas inlet 1701A communicated with the analysis tower top condenser 17, the center of the bottom end of the analysis tower top condenser 17 is provided with a concentrated hydrochloric acid discharge pipeline C communicated with the analysis tower top condenser 17, the lower part of one side end of the analysis tower top condenser 17 is provided with a hydrogen chloride gas outlet 1702B communicated with the analysis tower top condenser 17, the other side end of the analysis tower top condenser 17 is sequentially provided with a circulating water outlet pipeline D and a circulating water inlet pipeline 1401D communicated with the analysis tower top condenser 17 from top to bottom, and the hydrogen chloride gas outlet 1401A is communicated with the hydrogen chloride gas inlet 1701A through the hydrogen chloride gas pipeline A.
A hydrogen chloride gas inlet 1801B, a circulating water outlet pipeline E and a circulating water inlet pipeline E which are communicated with the primary falling film absorber 18 are sequentially arranged at one side end of the primary falling film absorber 18 from top to bottom, and a hydrogen chloride gas outlet 1702B is communicated with the hydrogen chloride gas inlet 1801B through a hydrogen chloride gas pipeline B; the other side end of the primary falling film absorber 18 is sequentially provided with a concentrated hydrochloric acid feeding pipeline D and a hydrogen chloride gas outlet 1802C which are communicated with the primary falling film absorber 18 from top to bottom; the bottom center of the first-level falling film absorber 18 is provided with a concentrated hydrochloric acid discharge pipeline D communicated with the first-level falling film absorber 18, and the other end of the concentrated hydrochloric acid discharge pipeline D is communicated with a concentrated hydrochloric acid discharge pipeline C.
A hydrogen chloride gas inlet 1901C, a circulating water outlet pipeline F and a circulating water inlet pipeline F which are communicated with the secondary falling film absorber 19 are sequentially arranged at one side end of the secondary falling film absorber 19 from top to bottom, and a hydrogen chloride gas outlet 1802C is communicated with the hydrogen chloride gas inlet 1901C through a hydrogen chloride gas pipeline C; the other side end of the secondary falling film absorber 19 is sequentially provided with a concentrated hydrochloric acid feeding pipeline C and a hydrogen chloride gas outlet 1902D which are communicated with the secondary falling film absorber 19 from top to bottom; the center of the bottom end of the second-stage falling film absorber 19 is communicated with a concentrated hydrochloric acid feeding pipeline D on the first-stage falling film absorber 18.
A hydrogen chloride gas inlet 2001D communicated with the tail gas absorption tower 20 is arranged at the lower part of one side end of the tail gas absorption tower 20, and a hydrogen chloride gas outlet 1902D is communicated with the hydrogen chloride gas inlet 2001D through a hydrogen chloride gas pipeline D; a concentrated hydrochloric acid feeding pipeline B communicated with the tail gas absorption tower 20 is arranged at the upper part of the other side end of the tail gas absorption tower 20, the center of the top end of the tail gas absorption tower 20 is communicated with a hydrogen chloride tail gas feeding pipe on a hydrogen chloride/water mixed gas feeding pipeline A, a pressure flow control valve 2002 is also arranged on the hydrogen chloride tail gas feeding pipe in series, and the pressure flow control valve 2002 is arranged close to the concentration tower; the bottom center of the tail gas absorption tower 20 is communicated with a concentrated hydrochloric acid feeding pipeline C on the secondary falling film absorber 19.
The center of the top end of the concentrated acid cooler 21 is communicated with a concentrated hydrochloric acid feeding pipeline B on the tail gas absorption tower 20, and the center of the bottom end of the concentrated acid cooler 21 is communicated with a concentrated hydrochloric acid discharging pipeline E on a concentrated hydrochloric acid discharging pipeline B; a circulating water outlet pipeline G and a circulating water inlet pipeline G which are communicated with the concentrated acid cooler 21 are sequentially arranged at one side end of the concentrated acid cooler 21 from top to bottom.
The upper end of the hydrochloric acid tank 22 is communicated with a concentrated hydrochloric acid discharge pipeline C on the analysis tower top condenser 17, and a hydrogen chloride gas pipeline E is also communicated between the upper end of the hydrochloric acid tank 22 and the hydrogen chloride gas pipeline C; a concentrated hydrochloric acid discharge pipeline F communicated with the hydrochloric acid tank 22 is arranged at the lower part of one side end of the hydrochloric acid tank 22, a hydrochloric acid discharge pump 2201 is also arranged on the concentrated hydrochloric acid discharge pipeline F in series, and two hydrochloric acid discharge pumps 2201 are arranged on the concentrated hydrochloric acid discharge pipeline F in parallel.
In this embodiment, a regeneration method of a regeneration system for waste acid containing tar is adopted, and the regeneration method includes the following steps:
a) preheating waste acid containing tar, introducing the waste acid containing the tar into an evaporation feed preheater 1 to exchange heat with a high-temperature medium for heating, and introducing the preheated waste acid containing the tar into a film evaporator 2; so that the waste acid is evaporated out of the high-purity hydrogen chloride gas through steam;
b) after the waste acid containing tar is evaporated by a film evaporator 2, generating hydrogen chloride/water mixed gas and tar residues, and sending the tar residues to a residue buffer tank 3 for subsequent treatment;
c) introducing the hydrogen chloride/water mixed gas generated in the step b) into a demister 4 for defoaming treatment, then introducing the hydrogen chloride/water mixed gas subjected to defoaming treatment into a concentration tower 7 at the flow rate of 2/3 containing the flow rate of tar waste acid, and introducing dilute hydrochloric acid into the concentration tower, wherein the volume ratio of the introduced dilute hydrochloric acid to the mixed gas is 2: 1, carrying out concentration reaction on hydrogen chloride/water mixed gas and dilute hydrochloric acid, wherein the pressure in a concentration tower is-0.096 Mpa;
d) after the concentration reaction is finished, hydrochloric acid with the mass percentage concentration of 23% and heavy component gas are generated at the bottom of the concentration tower 7, and then the hydrochloric acid with the mass percentage concentration of 23% is conveyed and stored through a discharge pump of the concentration tower for later use; introducing heavy component gas into a concentration tower reboiler 8 at 1/3 flow rate of tar-containing waste acid flow rate, concentrating and reboiling to obtain hydrochloric acid with mass percentage concentration of 23%, and conveying and storing through a concentration tower discharge pump; the steam pressure of a reboiler of the concentration tower is 0.4Mpa, and the temperature is controlled at 120 ℃;
e) after the concentration reaction is finished, generating acid wastewater and light component gas at the top of the concentration tower 7, then sequentially passing the light component gas through a first-stage condenser 10 and a second-stage condenser 11 at the top of the concentration tower for condensation treatment, and combining with vacuum pumping treatment, wherein in the treatment process, the generated acid wastewater and the acid wastewater generated at the top of the concentration tower 7 are collected together in a centralized manner and are subjected to subsequent treatment;
f) conveying the hydrochloric acid with the mass percentage concentration of 23% obtained in the step d) to an analysis tower 14 through a material outlet pump 702 of the concentration tower, heating to 115-120 ℃, generating a diluted hydrochloric acid, a hydrogen chloride gas and a hydrogen chloride/water mixed gas, evaporating and separating the hydrogen chloride/water mixed gas in the hydrochloric acid with the mass percentage concentration of 23% through an analysis reboiler 15 at the bottom of the analysis tower 14, entering an analysis condensate water tank 16 for condensation, and introducing the condensed hydrogen chloride gas into the analysis tower 14 again for repeated cyclic analysis;
g) f) introducing the dilute hydrochloric acid generated in the step f) into a concentration tower 7 for concentration reaction again, introducing the generated hydrogen chloride gas into an analysis tower top condenser 17 for condensation, introducing the generated hydrochloric acid with the mass percentage concentration of 30% into a hydrochloric acid tank 22 for storage, and sequentially introducing the hydrogen chloride gas generated in the condensation process into a primary falling film absorber 18 and a secondary falling film absorber 19;
h) and (2) sequentially introducing hydrochloric acid in a concentrated hydrochloric acid discharge pipe E into a concentrated acid cooler 21, a tail gas absorption tower 20, a secondary falling film absorber 19 and a primary falling film absorber 18, carrying out absorption reaction with hydrogen chloride gas, finally introducing the hydrochloric acid with the mass percentage concentration of 30% generated in the primary falling film absorber 18 into a hydrochloric acid tank 22 for storage, and introducing hydrogen chloride tail gas generated in the tail gas absorption tower 20 into a concentration tower 7 for participating in the concentration reaction.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A regeneration system containing tar waste acid is characterized in that: the regeneration system comprises an evaporation system, a concentration system and a desorption and absorption system,
the evaporation system comprises an evaporation feed preheater, a thin film evaporator, a residue buffer tank, a demister, an evaporation condensate water tank and a desorption tower preheater,
a feed inlet A communicated with the evaporation feed preheater is formed in the center of the bottom end of the evaporation feed preheater, a discharge outlet A communicated with the evaporation feed preheater is formed in the center of the top end of the evaporation feed preheater, and a condensate water outlet pipeline A and a condensate water inlet pipeline A communicated with the evaporation feed preheater are sequentially arranged at the side end of the evaporation feed preheater from top to bottom;
the outer side wall of the thin film evaporator is provided with a jacket, a feed inlet B1 and a discharge outlet B1 which are communicated with the thin film evaporator are respectively arranged on two sides of the top end of the thin film evaporator, a feed inlet B2 which is communicated with the thin film evaporator is arranged on the side part of the upper end of the thin film evaporator, a discharge outlet B2 which is communicated with the thin film evaporator is arranged in the center of the bottom end of the thin film evaporator, a saturated steam inlet pipeline A and a condensed water outlet pipeline B which are communicated with the jacket are sequentially arranged on the jacket from top to bottom, and the other end of the condensed water outlet pipeline B is also communicated with an evaporation condensed water tank;
a feed inlet C communicated with the residue buffer tank is formed in the center of the top end of the residue buffer tank, and a discharge outlet C communicated with the residue buffer tank is formed in the center of the bottom end of the residue buffer tank;
a feed inlet D communicated with the demister is formed in the center of the bottom end of the demister, a hydrogen chloride/water mixed gas discharge pipeline A communicated with the demister is formed in the center of the top end of the demister, and a discharge outlet D communicated with the demister is formed in the side end of the bottom of the demister;
a saturated steam inlet pipeline B communicated with the evaporation condensation water tank is arranged in the center of the top end of the evaporation condensation water tank, and the other end of the saturated steam inlet pipeline B is communicated with the saturated steam inlet pipeline A; a condensed water inlet pipeline C and a condensed water outlet pipeline C which are communicated with the evaporation condensed water tank are sequentially arranged at the side end of the evaporation condensed water tank from top to bottom;
a concentrated hydrochloric acid discharge pipeline A communicated with the desorption tower preheater is arranged in the center of the top end of the desorption tower preheater, and a concentrated hydrochloric acid feed pipeline A communicated with the desorption tower preheater is arranged in the center of the bottom end of the desorption tower preheater; the upper end of one side of the desorption tower preheater is communicated with a condensed water outlet pipeline C through a connecting pipe A, and the lower end of the other side of the desorption tower preheater is communicated with the condensed water outlet pipeline C through a connecting pipe B;
the discharge port A is communicated with the feed port B1 through a pipeline A, the discharge port B2 is communicated with the feed port C through a pipeline B, the discharge port B1 is communicated with the feed port D through a pipeline C, and the discharge port D is communicated with the feed port B2 through a pipeline D;
the concentration system comprises a concentration tower, a concentration reboiler, a concentration condensate water tank, a first-stage condenser at the top of the concentration tower, a second-stage condenser at the top of the concentration tower, a vacuum buffer tank and a water jet pump vacuum unit,
the center of the top end of the concentration tower is provided with an acid gas outlet A communicated with the concentration tower, the center of the bottom end of the concentration tower is provided with a concentrated hydrochloric acid discharge pipeline B communicated with the concentration tower, and the concentrated hydrochloric acid discharge pipeline B is communicated with a concentrated hydrochloric acid feeding pipeline A; a concentrated hydrochloric acid discharging pipeline E is communicated with the concentrated hydrochloric acid discharging pipeline B, and a concentrating tower discharging pump is also connected in series with the concentrated hydrochloric acid discharging pipeline B; a dilute hydrochloric acid feeding pipeline A, a hydrogen chloride/water mixed gas feeding pipeline A and an acid gas discharging pipeline A which are communicated with the concentration tower are sequentially arranged at one side end of the concentration tower from top to bottom, the hydrogen chloride/water mixed gas feeding pipeline A is communicated with the hydrogen chloride/water mixed gas discharging pipeline A, a hydrogen chloride tail gas feeding pipe is further communicated with the hydrogen chloride/water mixed gas feeding pipeline A, and an acid wastewater discharging pipe A communicated with the concentration tower is arranged at the upper part of the other side end of the concentration tower;
the top end of the reboiler of the concentration tower is communicated with the acidic gas discharge pipeline A through a connecting pipe C, and the bottom end of the reboiler of the concentration tower is communicated with the concentrated hydrochloric acid discharge pipeline B through a connecting pipe D; a saturated steam inlet pipeline C, a condensed water outlet A1 and a condensed water outlet A2 which are communicated with the concentration reboiler are sequentially arranged at one side end of the concentration tower reboiler from top to bottom;
a condensed water inlet A1 communicated with the condensed water tank is formed in the center of the top end of the condensed water tank, an acid gas discharge pipeline B and a condensed water outlet pipeline A which are communicated with the condensed water tank are sequentially arranged at one side end of the condensed water tank from top to bottom, and the condensed water outlet pipeline A is communicated with the condensed water inlet pipeline A; the upper part of the other side end of the condensed water tank is provided with a condensed water inlet A2 communicated with the condensed water tank;
the condensed water outlet A1 is communicated with the condensed water inlet A1 through a connecting pipe E, and the condensed water outlet A2 is communicated with the condensed water inlet A2 through a connecting pipe F;
the center of the top end of the first-stage condenser at the top of the concentration tower is provided with an acid gas inlet A communicated with the first-stage condenser at the top of the concentration tower, the center of the bottom end of the first-stage condenser at the top of the concentration tower is provided with an acid wastewater discharge pipe B communicated with the first-stage condenser at the top of the concentration tower, the other end of the acid wastewater discharge pipe B is communicated with the acid wastewater discharge pipe A, and the acid wastewater discharge pipe B is also provided with a vacuum condensation wastewater pump in series; the side end of the first-stage condenser at the top of the concentration tower is sequentially provided with a circulating water outlet pipeline A and a circulating water inlet pipeline A from top to bottom, and the lower part of the other side end of the first-stage condenser at the top of the concentration tower is provided with an acid gas outlet A communicated with the first-stage condenser at the top of the concentration tower;
the center of the top end of the second-stage condenser at the top of the concentration tower is provided with an acid gas inlet B communicated with the second-stage condenser at the top of the concentration tower, and the acid gas inlet B is communicated with an acid gas outlet A through a connecting pipe G; an acid wastewater discharge pipe C communicated with the second-stage condenser at the top of the concentration tower is arranged in the center of the bottom end of the second-stage condenser at the top of the concentration tower, and the other end of the acid wastewater discharge pipe C is communicated with an acid wastewater discharge pipe B; a circulating water outlet pipeline B and a circulating water inlet pipeline B are sequentially arranged at the side end of the second-stage condenser at the top of the concentrating tower from top to bottom, and a vacuumizing pipeline A communicated with the second-stage condenser at the top of the concentrating tower is arranged at the lower part of the other side end of the second-stage condenser at the top of the concentrating tower;
a vacuumizing pipeline B communicated with the vacuum buffer tank is arranged in the center of the top end of the vacuum buffer tank, and the other end of the vacuumizing pipeline B is communicated with a connecting pipe G; an acidic wastewater discharge pipe D communicated with the vacuum buffer tank is arranged on the side part of the top end of the vacuum buffer tank, and the other end of the acidic wastewater discharge pipe D is communicated with the acidic wastewater discharge pipe A; two sides of the lower end of the vacuum buffer tank are respectively communicated with an acidic wastewater discharging pipe B and an acidic wastewater discharging pipe C through a connecting pipe H and a connecting pipe I, and an acidic wastewater discharging pipe E is also communicated and arranged on the acidic wastewater discharging pipe A;
the water flow jet pump vacuum unit is communicated with the vacuumizing pipeline A, the water flow jet pump vacuum unit is also communicated with a venting pipeline A, and a venting pipeline B is also communicated between the vacuumizing pipeline A and the venting pipeline A; the water jet pump vacuum unit is also communicated with an industrial water inlet pipeline and is sequentially provided with a circulating water outlet pipeline C and a circulating water inlet pipeline C from top to bottom;
the analysis and absorption system comprises an analysis tower, an analysis tower reboiler, an analysis condensate water tank, an analysis tower top condenser, a primary falling film absorber, a secondary falling film absorber, a tail gas absorption tower, a concentrated acid cooler and a hydrochloric acid tank,
a hydrogen chloride gas outlet A communicated with the desorption tower is formed in the center of the top end of the desorption tower, the upper part of one side end of the desorption tower is communicated with a concentrated hydrochloric acid discharge pipeline A on a preheater of the desorption tower, and a hydrogen chloride/water mixed gas discharge pipeline B communicated with the top ends of the desorption tower and a reboiler of the desorption tower is formed in the lower part of one side end of the desorption tower; a dilute hydrochloric acid feeding pipeline B communicated with the bottom of the desorption tower and the bottom of a reboiler of the desorption tower is arranged in the center of the bottom of the desorption tower; the lower part of the other side end of the desorption tower is communicated with a dilute hydrochloric acid feeding pipeline A on the concentration tower, and a liquid level flow control valve is also arranged on the dilute hydrochloric acid feeding pipeline A in series and is close to the concentration tower;
a saturated steam inlet pipeline D, a condensed water outlet B1 and a condensed water outlet B2 which are communicated with the desorption reboiler are sequentially arranged at one side end of the desorption reboiler from top to bottom;
a condensate water inlet B1 communicated with the analysis condensate water tank is formed in the center of the top end of the analysis condensate water tank, a condensate water inlet B2 communicated with the analysis condensate water tank is formed in the upper portion of the side end of the analysis condensate water tank, and the lower portion of the other side end of the analysis condensate water tank is communicated with a condensate water inlet pipeline C on the evaporation condensate water tank; the condensed water outlet B1 is communicated with a condensed water inlet B1 through a connecting pipe H, and the condensed water outlet B2 is communicated with a condensed water inlet B2 through a connecting pipe I;
a hydrogen chloride gas inlet A communicated with the analysis overhead condenser is formed in the center of the top end of the analysis overhead condenser, a concentrated hydrochloric acid discharging pipeline C communicated with the analysis overhead condenser is formed in the center of the bottom end of the analysis overhead condenser, a hydrogen chloride gas outlet B communicated with the analysis overhead condenser is formed in the lower portion of one side end of the analysis overhead condenser, a circulating water outlet pipeline D and a circulating water inlet pipeline D communicated with the analysis overhead condenser are sequentially arranged at the other side end of the analysis overhead condenser from top to bottom, and the hydrogen chloride gas outlet A is communicated with the hydrogen chloride gas inlet A through the hydrogen chloride gas pipeline A;
a hydrogen chloride gas inlet B, a circulating water outlet pipeline E and a circulating water inlet pipeline E which are communicated with the primary falling film absorber are sequentially arranged at one side end of the primary falling film absorber from top to bottom, and the hydrogen chloride gas outlet B is communicated with the hydrogen chloride gas inlet B through a hydrogen chloride gas pipeline B; the other side end of the primary falling film absorber is sequentially provided with a concentrated hydrochloric acid feeding pipeline D and a hydrogen chloride gas outlet C which are communicated with the primary falling film absorber from top to bottom; a concentrated hydrochloric acid discharge pipeline D communicated with the primary falling film absorber is arranged in the center of the bottom end of the primary falling film absorber, and the other end of the concentrated hydrochloric acid discharge pipeline D is communicated with a concentrated hydrochloric acid discharge pipeline C;
a hydrogen chloride gas inlet C, a circulating water outlet pipeline F and a circulating water inlet pipeline F which are communicated with the secondary falling film absorber are sequentially arranged at one side end of the secondary falling film absorber from top to bottom, and the hydrogen chloride gas outlet C is communicated with the hydrogen chloride gas inlet C through the hydrogen chloride gas pipeline C; the other side end of the secondary falling film absorber is sequentially provided with a concentrated hydrochloric acid feeding pipeline C and a hydrogen chloride gas outlet D which are communicated with the secondary falling film absorber from top to bottom; the center of the bottom end of the secondary falling film absorber is communicated with a concentrated hydrochloric acid feeding pipeline D on the primary falling film absorber;
a hydrogen chloride gas inlet D communicated with the tail gas absorption tower is formed in the lower part of one side end of the tail gas absorption tower, and the hydrogen chloride gas outlet D is communicated with the hydrogen chloride gas inlet D through a hydrogen chloride gas pipeline D; a concentrated hydrochloric acid feeding pipeline B communicated with the tail gas absorption tower is arranged at the upper part of the other side end of the tail gas absorption tower, the center of the top end of the tail gas absorption tower is communicated with a hydrogen chloride tail gas feeding pipe on a hydrogen chloride/water mixed gas feeding pipeline A, a pressure flow control valve is also connected in series on the hydrogen chloride tail gas feeding pipe, and the pressure flow control valve is arranged close to the concentration tower; the center of the bottom end of the tail gas absorption tower is communicated with a concentrated hydrochloric acid feeding pipeline C on the secondary falling film absorber;
the center of the top end of the concentrated acid cooler is communicated with a concentrated hydrochloric acid feeding pipeline B on the tail gas absorption tower, and the center of the bottom end of the concentrated acid cooler is communicated with a concentrated hydrochloric acid discharging pipeline E on a concentrated hydrochloric acid discharging pipeline B; a circulating water outlet pipeline G and a circulating water inlet pipeline G which are communicated with the concentrated acid cooler are sequentially arranged at one side end of the concentrated acid cooler from top to bottom;
the upper end of the hydrochloric acid tank is communicated with a concentrated hydrochloric acid discharge pipeline C on a condenser at the top of the analysis tower, and a hydrogen chloride gas pipeline E is also communicated between the upper end of the hydrochloric acid tank and the hydrogen chloride gas pipeline C; a concentrated hydrochloric acid discharge pipeline F communicated with the hydrochloric acid tank is arranged on the lower portion of one side end of the hydrochloric acid tank, and a hydrochloric acid discharge pump is further arranged on the concentrated hydrochloric acid discharge pipeline F in series.
2. The regeneration system of spent acid containing tar according to claim 1, characterized in that: three film evaporators are arranged on the pipeline A in parallel.
3. The regeneration system of spent acid containing tar according to claim 1, characterized in that: and two residue buffer tanks are arranged on the pipeline B in parallel.
4. The regeneration system of spent acid containing tar according to claim 1, wherein: two discharge pumps of the concentration tower are arranged on a concentrated hydrochloric acid discharge pipeline B in parallel.
5. The regeneration system of spent acid containing tar according to claim 1, characterized in that: the vacuum condensation waste water pump has two, parallelly connected setting between acid waste water discharging pipe A and acid waste water discharging pipe B.
6. The regeneration system of spent acid containing tar according to claim 1, characterized in that: the three water flow injection pump vacuum units are arranged on the vacuum-pumping pipeline A in parallel.
7. The regeneration system of spent acid containing tar according to claim 1, characterized in that: the two hydrochloric acid discharge pumps are arranged on the concentrated hydrochloric acid discharge pipeline F in parallel.
8. A method of regenerating the tar-containing waste acid regeneration system of claim 1, wherein the method comprises the steps of: the regeneration method comprises the following steps:
a) preheating waste acid containing tar, introducing the waste acid containing the tar into an evaporation feed preheater to exchange heat with a high-temperature medium to heat to 75-85 ℃, and introducing the preheated waste acid containing the tar into a film evaporator so as to evaporate high-purity hydrogen chloride gas out of the waste acid through steam;
b) evaporating the waste acid containing tar by a film evaporator to generate hydrogen chloride/water mixed gas and tar residues, and sending the tar residues to residue buffer for subsequent treatment;
c) introducing the hydrogen chloride/water mixed gas generated in the step b) into a demister for defoaming treatment, then introducing the hydrogen chloride/water mixed gas subjected to defoaming treatment into a concentration tower at 2/3 flow of tar-containing waste acid flow, and introducing dilute hydrochloric acid into the concentration tower, wherein the volume proportional relation between the introduced dilute hydrochloric acid and the mixed gas is 2: 1, carrying out concentration reaction on the hydrogen chloride/water mixed gas and dilute hydrochloric acid, wherein the pressure in a concentration tower is-0.096 Mpa;
d) after the concentration reaction is finished, hydrochloric acid with the mass percentage concentration of 23% and heavy component gas are generated at the bottom of the concentration tower, and then the hydrochloric acid with the mass percentage concentration of 23% is conveyed and stored through a discharge pump of the concentration tower for later use; introducing heavy component gas into a reboiler of a concentration tower at 1/3 flow rate of tar-containing waste acid flow rate, concentrating and reboiling to obtain hydrochloric acid with mass percentage concentration of 23%, and conveying and storing through a discharge pump of the concentration tower; the steam pressure of a reboiler of the concentration tower is 0.4Mpa, and the temperature is controlled at 120 ℃;
e) after the concentration reaction is finished, generating acid wastewater and light component gas at the top of a concentration tower, then sequentially passing the light component gas through a first-stage condenser at the top of the concentration tower and a second-stage condenser at the top of the concentration tower for condensation treatment, and combining with vacuumizing treatment, wherein in the treatment process, the generated acid wastewater and the acid wastewater generated at the top of the concentration tower are collected together in a centralized manner and are subjected to subsequent treatment;
f) conveying the hydrochloric acid with the mass percentage concentration of 23% obtained in the step d) to an analysis tower through a discharge pump of the concentration tower, heating to 115-120 ℃, generating diluted hydrochloric acid, hydrogen chloride gas and hydrogen chloride/water mixed gas, evaporating and separating the hydrogen chloride/water mixed gas in the hydrochloric acid with the mass percentage concentration of 23% through an analysis reboiler at the bottom of the analysis tower, condensing the gas in an analysis condensation water tank, and introducing the condensed hydrogen chloride gas into the analysis tower again for repeated cyclic analysis;
g) f) introducing the dilute hydrochloric acid generated in the step f) into a concentration tower for carrying out concentration reaction again, introducing the generated hydrogen chloride gas into an analysis tower top condenser for condensation, introducing the generated hydrochloric acid with the mass percentage concentration of 30% into a hydrochloric acid tank for storage, and sequentially introducing the hydrogen chloride gas generated in the condensation process into a primary falling film absorber and a secondary falling film absorber;
h) and (3) sequentially introducing hydrochloric acid in a concentrated hydrochloric acid discharge pipe E into a concentrated acid cooler, a tail gas absorption tower, a secondary falling film absorber and a primary falling film absorber, carrying out absorption reaction with hydrogen chloride gas, finally introducing hydrochloric acid with the mass percentage concentration of 30% generated in the primary falling film absorber into a hydrochloric acid tank for storage, and introducing hydrogen chloride tail gas generated in the tail gas absorption tower into a concentration tower to participate in the concentration reaction.
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