CN102502716A

CN102502716A - Technology for cooling ammonia mother liquor I in crystallizing working section during combined soda producing process

Info

Publication number: CN102502716A
Application number: CN2011103547609A
Authority: CN
Inventors: 赵祥海; 朱爱民
Original assignee: 赵祥海; 朱爱民
Current assignee: Lianyungang Fuyuan Debon Technology Development Co., Ltd.
Priority date: 2011-11-10
Filing date: 2011-11-10
Publication date: 2012-06-20
Anticipated expiration: 2031-11-10
Also published as: CN102502716B

Abstract

A technology for cooling ammonia mother liquor I in a crystallizing working section during a combined soda producing process is characterized by comprising the following steps that: hot ammonia mother liquor I is sent to a water cooler, the heat of the hot ammonia mother liquor I is exchanged and the temperature of the hot ammonia mother liquor I is reduced; the ammonia mother liquor I exchanges heat with mother liquor II through a mother liquor heat exchanger; the ammonia mother liquor I is sent to an ammonia mother liquor I crystallizer and an ammonia mother liquor I heat exchanger and exchanges heat with cold mother liquor II; the ammonia mother liquor I returns to an ammonia mother liquor I crystallizer through a collecting trough, overflows to a cold ammonia mother liquor I barrel, is sent to a cold separating crystallizer and to an external cooler, and exchanges heat with liquid ammonia; after the heat exchange, the ammonia mother liquor I returns to the cold separating crystallizer through the collecting trough; crystal slurry is sent to a cold separating thickener and a salt separating crystallizer; the separated crystal slurry is sent to a salt separating thickener; overflowing cold mother liquor II exchanges heat with the ammonia mother liquor I to obtain the mother liquor II; the obtained mother liquor II exchanges heat with the ammonia mother liquor I; and the mother liquor II after being subjected to the heat exchange is sent to an ammonia absorbing system. The technology for cooling the ammonia mother liquor I in the crystallizing working section during the combined soda producing process is a low-temperature AI cooling technology, which makes full use of high-quality low-temperature cold to reduce a freezing load of the system so as to fulfill an aim of saving energy; and the problem that the heat exchanger is easily blocked by crystallized AI because of too low temperature of the AI is solved.

Description

The ammonia I of crystallization workshop section mother liquor process for cooling in the procedure of producing soda under joint alkaline process

Technical field

The present invention relates to a kind of the present invention is a kind of alkaline process soda ash production technique, the ammonia I of crystallization workshop section mother liquor process for cooling in particularly a kind of procedure of producing soda under joint alkaline process.

Background technology

Crystallization Procedure is in traditional soda ash production process: the hot AI of self-priming ammonia send water-cooled and water coolant heat exchange in the future earlier, and the AI temperature is reduced to 38 ~ 40 ℃ after the heat exchange, changes (about 4 ~ 6) through one group of mother again; The AI temperature is reduced to 26 ~ 28 ℃ after the heat exchange, and feeding intake with cold AI is pumped to cool crystallizer, beats cold AI through propeller pump and goes outer cooler and liquefied ammonia heat exchange; Cold AI after the heat exchange returns cool crystallizer through aggregate groove, takes out magma by cool crystallizer middle part and send cold analysis stiff device, the cool crystallizer overflow precipitation and crystallization device that desalts; Salting-out crystallizer is further separated out ammonium chloride crystals through utilizing common-ion effcet with salt, is taken out by the salting-out crystallizer middle part and send the stiff device of saltouing; Salting-out crystallizer overflows back cold female II bucket; Be pumped to mother with cold female II and change the heat exchange with AI, the female II bucket of the female II backheat after the heat exchange removes to inhale ammonia with hot female II pumping.There is following defective in this crystallization process for cooling: cold AI feed temperature is higher, certainly will increase the freezing load of system, can not utilize the low level cold effectively and reasonably, increases the ice maker load of refrigeration system, has strengthened the facility investment and the maintenance expense of system; Owing to increased the freezing load of system, certainly will increase the mass consumption of working cost, the especially energy of system.With 300,000 tons/year soda ash CAPACITY CALCULATIONS OF A, needing increases by 3 500,000 Kcal/h ice makers, about 500,000 yuan, therefore increases by 1,500,000 yuan of costs of equipment with every expense; With 300,000 tons/year soda ash CAPACITY CALCULATIONS OF A, the system energy consumption increase is bigger, and soda ash ton alkali power consumption is higher, about 250KW.h/ ton alkali.

Summary of the invention

Technical problem to be solved by this invention is the deficiency to prior art, and the ammonia I of crystallization workshop section mother liquor (AI) process for cooling in a kind of procedure of producing soda under joint alkaline process new, that can reduce system's freezing load, minimizing facility investment expense and energy consumption is provided.

Technical problem to be solved by this invention is to realize through following technical scheme.The present invention is the ammonia I of a crystallization workshop section mother liquor process for cooling in a kind of procedure of producing soda under joint alkaline process, is characterized in that its step is following:

(1) the hot ammonia I mother liquor of elder generation's self-priming ammonia in future send water cooler and water coolant heat exchange; After ammonia I mother liquor temperature reduced to 38 ~ 40 ℃; Through one group of mother liquor interchanger and mother liquor II heat exchange, ammonia I mother liquor temperature is reduced to 26 ~ 28 ℃ then, deliver to ammonia I mother liquor crystallization device again; Through first propeller pump ammonia I mother liquor is squeezed into ammonia I mother liquor interchanger and cold female II heat exchange, the ammonia I mother liquor after the heat exchange returns through first aggregate groove and gets 23 ~ 24 ℃ cold ammonia I mother liquor in the ammonia I mother liquor crystallization device; Cold ammonia I mother liquor overflows to the cold ammonia I mother vat from ammonia I mother liquor crystallization device; With the cold ammonia I mother liquor pump that feeds intake cold ammonia I mother liquor is delivered to cool crystallizer; Deliver to outer cooler and liquefied ammonia heat exchange through second propeller pump again, 9 ~ 11 ℃ of cold ammonia I mother liquors that obtain after the heat exchange return cool crystallizer through second aggregate groove;

(2) take out magma from cool crystallizer middle part and send cold analysis stiff device, the cool crystallizer overflow precipitation and crystallization device that desalts adds an amount of NaCl in salting-out crystallizer; Utilize common-ion effcet, further separate out ammonium chloride crystals, take out magma from the salting-out crystallizer middle part and send the stiff device of saltouing; Salting-out crystallizer overflow to cold female II bucket; With pump cold female II is delivered to ammonia I mother liquor interchanger, the 3rd propeller pump that is connected on the ammonia I mother liquor interchanger reduces ammonia I mother liquor temperature with cold female II and the heat exchange of ammonia I Recycling Mother Solution; Improve cold female II temperature simultaneously; The mother liquor II that obtains after the heat exchange delivers to mother liquor interchanger and the heat exchange of ammonia I mother liquor, and the mother liquor II after the heat exchange delivers to mother liquor II bucket, and mother liquor II goes to inhale ammonia system through pumping.

In the above-described procedure of producing soda under joint alkaline process in the ammonia I of the crystallization workshop section mother liquor process for cooling technical scheme: described one group of mother liquor interchanger is preferably connected to form by 3-5 interchanger, is most preferably connected to form by 4 interchanger.

Technology compares experiment according to the present invention, and save energy is calculated as follows: with 300,000 tons/year soda ash CAPACITY CALCULATIONS OF A widely; Technology on year-on-year basis; Can reduce by 3 500,000 Kcal/h ice makers, therefore every expense reduces 1,500,000 yuan of costs of equipment about 500,000 yuan; The power of motor of one 500,000 Kcal/h ice maker is 250KW, and with 0.6 yuan of calculating of every degree electricity, then three 500,000 Kcal/h ice makers can reduce 3,600,000 yuan of the electricity charge every year.

Compared with prior art, the present invention has the following advantages: the present invention adopts AI subcooling technology, makes full use of high-grade low temperature cold; Accomplish the reasonable utilization of cold; Reduction system freezing load reaches the purpose of save energy, has greatly practiced thrift industrial cost.Solve simultaneously cold AI temperature again and crossed the problem that low easy and crystalline is stopped up interchanger.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention.

Embodiment

Following with reference to accompanying drawing, further describe concrete technical scheme of the present invention, so that those skilled in the art understands the present invention further, and do not constitute restriction to its right.

Embodiment 1, with reference to Fig. 1, and the ammonia I of crystallization workshop section mother liquor process for cooling in a kind of procedure of producing soda under joint alkaline process, its step is following:

(1) the hot ammonia I mother liquor of elder generation's self-priming ammonia in future send water cooler 1 and water coolant heat exchange; After ammonia I mother liquor temperature reduced to 38 ~ 40 ℃; Through one group of mother liquor interchanger 2 and mother liquor II heat exchange, ammonia I mother liquor temperature is reduced to 26 ~ 28 ℃ then, deliver to ammonia I mother liquor crystallization device 3 again; Through first propeller pump 4 ammonia I mother liquor is squeezed into ammonia I mother liquor interchanger 5 and cold female II heat exchange, the ammonia I mother liquor after the heat exchange returns through first aggregate groove 6 and gets 23 ~ 24 ℃ cold ammonia I mother liquor in the ammonia I mother liquor crystallization device 3; Cold ammonia I mother liquor overflows to the cold ammonia I mother vat 7 from ammonia I mother liquor crystallization device 3; With the cold ammonia I mother liquor pump 8 that feeds intake cold ammonia I mother liquor is delivered to cool crystallizer 9; Deliver to outer cooler 10 and liquefied ammonia heat exchange through second propeller pump 11 again, 9 ~ 11 ℃ of cold ammonia I mother liquors that obtain after the heat exchange return cool crystallizer 9 through second aggregate groove 12;

(2) take out magma from cool crystallizer 9 middle parts and send cold analysis stiff device, the cool crystallizer 9 overflows precipitation and crystallization device 13 that desalts adds an amount of NaCl in salting-out crystallizer 13; Utilize common-ion effcet, further separate out ammonium chloride crystals, take out magma from salting-out crystallizer 13 middle parts and send the stiff device of saltouing; Salting-out crystallizer 13 overflows to cold female II bucket 14; With pump cold female II is delivered to ammonia I mother liquor interchanger 5, the 3rd propeller pump 15 that is connected on the ammonia I mother liquor interchanger 5 reduces ammonia I mother liquor temperature with cold female II and the heat exchange of ammonia I Recycling Mother Solution; Improve cold female II temperature simultaneously; The mother liquor II that obtains after the heat exchange delivers to mother liquor interchanger 2 and the heat exchange of ammonia I mother liquor, and the mother liquor II after the heat exchange delivers to mother liquor II bucket 16, and mother liquor II goes to inhale ammonia system through pumping.

Embodiment 2, and in the embodiment 1 described procedure of producing soda under joint alkaline process in the ammonia I of the crystallization workshop section mother liquor process for cooling: described one group of mother liquor interchanger 2 is connected to form by 4 interchanger.

Claims

1. the ammonia I of crystallization workshop section mother liquor process for cooling in the procedure of producing soda under joint alkaline process is characterized in that its step is following:

(1) the hot ammonia I mother liquor of elder generation's self-priming ammonia in future send water cooler (1) and water coolant heat exchange; After ammonia I mother liquor temperature reduced to 38 ~ 40 ℃; Then through one group of mother liquor interchanger (2) and mother liquor II heat exchange; Ammonia I mother liquor temperature is reduced to 26 ~ 28 ℃; Deliver to ammonia I mother liquor crystallization device (3) again, through first propeller pump (4) ammonia I mother liquor is squeezed into ammonia I mother liquor interchanger (5) and cold female II heat exchange, the ammonia I mother liquor after the heat exchange returns through first aggregate groove (6) and gets 23 ~ 24 ℃ cold ammonia I mother liquor in the ammonia I mother liquor crystallization device (3); Cold ammonia I mother liquor overflows to the cold ammonia I mother vat (7) from ammonia I mother liquor crystallization device (3); With the cold ammonia I mother liquor pump (8) that feeds intake cold ammonia I mother liquor is delivered to cool crystallizer (9); Deliver to outer cooler (10) and liquefied ammonia heat exchange through second propeller pump (11) again, 9 ~ 11 ℃ of cold ammonia I mother liquors that obtain after the heat exchange return cool crystallizer (9) through second aggregate groove (12);

(2) take out magma from cool crystallizer (9) middle part and send cold analysis stiff device, cool crystallizer (9) the overflow precipitation and crystallization device (13) that desalts, an amount of NaCl of adding to salting-out crystallizer (13) in; Utilize common-ion effcet, further separate out ammonium chloride crystals, take out magma from salting-out crystallizer (13) middle part and send the stiff device of saltouing; Salting-out crystallizer (13) overflow to cold female II bucket (14); With pump cold female II is delivered to ammonia I mother liquor interchanger (5), the 3rd propeller pump (15) that is connected on the ammonia I mother liquor interchanger (5) reduces ammonia I mother liquor temperature with cold female II and the heat exchange of ammonia I Recycling Mother Solution; Improve cold female II temperature simultaneously; The mother liquor II that obtains after the heat exchange delivers to mother liquor interchanger (2) and the heat exchange of ammonia I mother liquor, and the mother liquor II after the heat exchange delivers to mother liquor II bucket (16), and mother liquor II goes to inhale ammonia system through pumping.

2. the ammonia I of crystallization workshop section mother liquor process for cooling in the procedure of producing soda under joint alkaline process according to claim 1, it is characterized in that: described one group of mother liquor interchanger (2) is connected to form by 3-5 interchanger.