CN207121429U

CN207121429U - The freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube

Info

Publication number: CN207121429U
Application number: CN201720948041.2U
Authority: CN
Inventors: 张根明
Original assignee: CHANGSHU SPECIAL SHAPED STEEL TUBE MILL Co Ltd
Current assignee: CHANGSHU SPECIAL SHAPED STEEL TUBE MILL Co Ltd
Priority date: 2017-08-01
Filing date: 2017-08-01
Publication date: 2018-03-20
Anticipated expiration: 2027-08-01

Abstract

The utility model discloses the freezing and crystallizing and retracting device of Waste Sulfuric Acid after a kind of acid cleaning of steel tube, including workshop pickling tube, it is acid adjustment pond after the workshop pickling tube, pump connects freezing reactor behind the acid adjustment pond, reactor is installed above mixer for the freezing, anti-corrosion titanium alloy coil pipe is installed inside the freezing reactor, the anti-corrosion titanium alloy coil pipe is connected with refrigerator, one-level vacuum solid-liquid separation tank is connected with below the freezing reactor, the one-level vacuum solid-liquid separation tank and vacuum pump set UNICOM, it is two-stage centrifugal machine below the one-level vacuum solid-liquid separation tank, the one-level vacuum solid-liquid separation tank and the two-stage centrifugal machine are all connected with reuse acid pond pipeline, the reuse acid pond connects with the workshop pickling tube pump again.The utility model being capable of energy-saving and emission-reduction, reduction production cost and human cost.

Description

The freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube

Technical field

Steel pipe's production spent acid post-processing technology field is the utility model is related to, more particularly to sulfur waste after a kind of acid cleaning of steel tube The freezing and crystallizing and retracting device of acid.

Background technology

With the further renewal of national requirements for environmental protection, the further raising of environmental protection concept, dangerous yield is reduced, Dangerous waste circulation and stress reduces substantial amounts of spent acid commission third party's processing cost, and the ferrous sulfate of recovery is by dyeing, useless After the purchase of water process unit, good economic benefit can also be produced, it is favourable in oneself, Yu Guo, Yu Minjun, therefore, sulfur waste pickling The scientific disposal of liquid is of practical significance very much.

Utility model content

The utility model is mainly solving the technical problems that providing the freezing and crystallizing of Waste Sulfuric Acid after a kind of acid cleaning of steel tube and returning Receiving apparatus, being capable of energy-saving and emission-reduction, reduction production cost and human cost.

In order to solve the above technical problems, the technical scheme that the utility model uses is：

The freezing and crystallizing and retracting device of Waste Sulfuric Acid after a kind of acid cleaning of steel tube, including workshop pickling tube, the workshop are provided Pickling tube connects with acid adjustment pond pipeline, and the acid adjustment pond connects freezing reactor, the freezing reaction by force (forcing) pump with pipeline Kettle is installed above mixer, and anti-corrosion titanium alloy coil pipe, the anti-corrosion titanium alloy coil pipe are provided with inside the freezing reactor It is connected with refrigerator, one-level vacuum solid-liquid separation tank, the one-level vacuum solid-liquid is connected with below the freezing reactor Separate tank and vacuum pump set UNICOM, are two-stage centrifugal machine below the one-level vacuum solid-liquid separation tank, the one-level vacuum solid-liquid Separate tank and the two-stage centrifugal machine are all connected with reuse acid pond pipeline, the reuse acid pond again with the workshop pickling tube pump Connect.

In one preferred embodiment of the utility model, the acid adjustment pond is connected with concentrated sulfuric acid storage cylinder.

In one preferred embodiment of the utility model, the refrigerator is connected with cooling tower.

In one preferred embodiment of the utility model, effective heat exchange area >=5m of the anti-corrosion titanium alloy coil pipe²。

In one preferred embodiment of the utility model, the total length of the anti-corrosion titanium alloy coil pipe is 50 meters, a diameter of 1.8m, the spacing above and below every layer of titanium alloy tube is 0.25m.

In one preferred embodiment of the utility model, form the anti-corrosion titanium alloy coil pipe titanium alloy tube it is a diameter of 32mm, wall thickness 1.5mm.

In one preferred embodiment of the utility model, the one-level vacuum solid-liquid separation tank and the two-stage centrifugal machine are all For double storehouse compartment structures.

The beneficial effects of the utility model are：The freezing and crystallizing of Waste Sulfuric Acid and recovery dress after the utility model acid cleaning of steel tube Put, the ferrous sulfate in the Waste Sulfuric Acid after acid cleaning of steel tube can be subjected to crystallization recovery, create economic value, while will contain Acid cleaning of steel tube process is again introduced into after the Waste Sulfuric Acid redistribution of ferrous ion, has not only saved cost, is also saved substantial amounts of Energy consumption, and can ensure that pickling, phosphatization, the holding of saponification quality of steel pipe are constant.

Brief description of the drawings

Fig. 1 is the flowage structure schematic diagram of the preferred embodiment of the utility model one；

The mark of each part is as follows in accompanying drawing：1st, workshop pickling tube, 2, acid adjustment pond, 3, concentrated sulfuric acid storage cylinder, 4, mixer, 5th, reactor is freezed, 501, anti-corrosion titanium alloy coil pipe, 6, refrigerator, 7, one-level vacuum solid-liquid separation tank, 8, two-stage centrifugal machine, 9, Vacuum pump set, 10, reuse acid pond.

Embodiment

Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model It can be easier to be readily appreciated by one skilled in the art with feature, it is apparent clear and definite so as to be made to the scope of protection of the utility model Define.

Reference picture 1, the utility model include workshop pickling tube 1, are acid adjustment pond 2 after the workshop pickling tube 1, the acid adjustment Pond 2 is connected with concentrated sulfuric acid storage cylinder 3, and concentrated sulfuric acid storage cylinder 3 is designed to valve opening gravity flow, and pump connects freezing behind the acid adjustment pond 2 Reactor 5, the freezing reactor 5 is installed above mixer 4, and the inside of freezing reactor 5 is provided with anti-corrosion titanium alloy Coil pipe 501, the anti-corrosion titanium alloy coil pipe 501 are connected with refrigerator 6, and the refrigerator 6 is connected with cooling tower；The freezing The lower section of reactor 5 is connected with one-level vacuum solid-liquid separation tank 7, the one-level vacuum solid-liquid separation tank 7 and vacuum pump set 9 Logical, the lower section of one-level vacuum solid-liquid separation tank 7 is two-stage centrifugal machine 8, the one-level vacuum solid-liquid separation tank 7 and the two level Centrifuge 8 is all connected with the pipeline of reuse acid pond 10, and the reuse acid pond 10 connects with the pump of workshop pickling tube 1 again.

Running of the present utility model：

1）Pickling-shop normal operation is as follows：H in workshop pickling tube 1₂SO₄Concentration from the concentration newly prepared be 20% Left and right is gradually reduced to 2 ~ 3%, and when ferrous ion progressively rises to more than 300g/l since 0g/l, ferrous ion is substantially saturated, steel Pipe pickling chemical reaction velocity is very slow, and now, spent acid will be placed in sour cylinder, makees dangerous waste processing, and commission has processing qualification The third party handled, be processed as not only risk being present in transportation, cost is higher, and this dangerous waste processing cost is about For 400 yuan/ton or so.

2）Spent acid in workshop pickling tube 1 is put into the acid adjustment pond 2 specified, is computed, the spent acid toward in acid adjustment pond 2 （Sulfuric acid concentration is 2 ~ 3%）Add in the concentrated sulfuric acid, it is optimal the later sulfuric acid concentration of mediation is controlled within 18 ~ 20%, and this When FeSO₄Concentration is still more than 300g/l.

3）The design of reactor and cooling pump stream：Design volume is 6m³, net diameter is 2m in reactor, is highly 2.2m, Anti-corrosion titanium alloy coil pipe 501 is made from a diameter of 32mm, the titanium alloy tube that wall thickness is 1.5mm, anti-corrosion titanium alloy coil pipe 501 Total length is about 50m, ensures effective heat exchange area >=5m², the anti-corrosion titanium alloy coil pipe 501 formed diameter of a circle be 1.8m, the spacing above and below every layer of titanium alloy tube is 0.25m, adds up to 9 layers.

4）The design of refrigeration speed：

A, the supplied materials temperature for freezing reactor 5 is up to 45 DEG C（Summer standard）, effective cooling time is 120min, freezing Final temperature is -3 DEG C, it is desirable to which average cooling rate is 0.4 DEG C/min, and refrigeration work consumption is under refrigerating capacity normal temperature operating mode 200kw；

B, the refrigerant temperature of chilled brine is -10 DEG C ~ -15 DEG C, and negative pressure pump flow vacuum degree is -0.08 ~ -0.10MPa；

C, 30 turns/min of mixing speed；

D, choice of main machine semi-closed type double-screw compressor is freezed；

E, unit selects automatic control system, from special cryogenic temperature controller, the integrated control of chip inlet, automatic inspection Survey, tune connects protection and automatic alarm；

F, 6 groups of refrigerator should be advantageous to the transmission of heat, prevent heat waste with reactor heat exchanger tube≤8m.

5）Separation of solid and liquid ferrous salt vacuum collecting pond, using double storehouse compartment structures, carry out one-level separation of solid and liquid（It is true in one-level Completed in empty solid-liquid separation tank 7）, then carry out two-stage centrifugal high speed rotating separation（Completed in two-stage centrifugal machine 8）, two level from The centrifugal pan of scheming 8 uses 304 stainless steels, and centrifugal pan design speed is 240 turns/min, and ferrous sulfate heptahydrate and reuse acid are entered Row separation, the sparkling and crystal-clear full crystalline solid pack packing of blue-green, reuse acid are flowed into reuse acid pond 10 by pipeline and stored；

6）Analyzed through physics and chemistry portion, reuse acid concentration now typically 18 ~ 20%, ferrous sulfate concentration in 60 ~ 80g/l, this By Pickling-shop, using effect proves reuse acid on the spot, due to possessing more than 60g/l Fe²⁺Initial concentration, reaction speed It is also faster 5 ~ 10 minutes than the directly pickle that is newly configured with 98% concentrated sulfuric acid, greatly save energy consumption, and the pickling matter of steel pipe Amount, phosphatization, saponification quality keep constant.

Embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, it is every The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in Other related technical areas, similarly it is included in scope of patent protection of the present utility model.

Claims

1. the freezing and crystallizing and retracting device of Waste Sulfuric Acid after a kind of acid cleaning of steel tube, it is characterised in that described including workshop pickling tube Workshop pickling tube connects with acid adjustment pond pipeline, and the acid adjustment pond connects freezing reactor, the freezing by force (forcing) pump with pipeline Reactor is installed above mixer, and anti-corrosion titanium alloy coil pipe, the anti-corrosion titanium alloy are provided with inside the freezing reactor Coil pipe is connected with refrigerator, and one-level vacuum solid-liquid separation tank, the one-level vacuum are connected with below the freezing reactor Solid-liquid separation tank and vacuum pump set UNICOM, are two-stage centrifugal machine below the one-level vacuum solid-liquid separation tank, the one-level vacuum Solid-liquid separation tank and the two-stage centrifugal machine are all connected with reuse acid pond pipeline, the reuse acid pond again with the workshop pickling tube Pump connects.

2. the freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube according to claim 1, it is characterised in that described Acid adjustment pond is connected with concentrated sulfuric acid storage cylinder.

3. the freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube according to claim 1, it is characterised in that described Refrigerator is connected with cooling tower.

4. the freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube according to claim 1, it is characterised in that institute State effective heat exchange area >=5m of anti-corrosion titanium alloy coil pipe²。

5. the freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube according to claim 4, it is characterised in that described The total length of anti-corrosion titanium alloy coil pipe is 50 meters, a diameter of 1.8m, and the spacing above and below every layer of titanium alloy tube is 0.25m.

6. the freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube according to claim 4, it is characterised in that form A diameter of 32mm, the wall thickness 1.5mm of the titanium alloy tube of the anti-corrosion titanium alloy coil pipe.

7. the freezing and crystallizing and retracting device of Waste Sulfuric Acid after acid cleaning of steel tube according to claim 1, it is characterised in that described One-level vacuum solid-liquid separation tank and the two-stage centrifugal machine are all double storehouses compartment structure.